Marshall Tone Stack Mods

Mods V Jr Original Silver/Gold "Marshallized" V Jr "Fenderized" V Jr R1 68K 1M 1M R2 68K 10K 68K R5 220K R6 1M Short out, or use 100k for less gain 100K R7 1M 91K - or 100k if R6=100k used. Can be used in conjunction with Presence pot swap if amp is still deemed too dark after that mod. A “brown sound” Marshall style overdrive, that can be pushed into distortion. Coupling Cap Installation, 4. In combination with the other diode switch, you're able to select. Modifications are most common on tube amplifiers. The further away from ground you lift the tone stack, the more mids, but the less effective the controls are. I will comment on what each step of the mod does: 1) Change R2 to 2. Here is a collection of schematics of (and related to) the 18watt amp. When replacing a 250k bass pot an 82k resistor works pretty well simulating a pot in the center position. The mods sound great. 18watt Technical Discussion. Mini amp 20 watt hybrid (the Marshall type) with an 8 inch cab Does come with power supply and cable for the cab. - Modified Tone Stack - The Factory Tone-Stack does not allow total tone control, The Controls sweep in a 'Preset-Range'. Most postings, books, and amp tone videos dwell on amp brands and mods and swapping tube types and swapping speakers or pickups, but such priorities are backwards. Marshall is probably the only "non-boutique" mass. 047 µF capacitors. During the last decade, the market has been flooded by affordable tube amps in all price ranges and while most of them will cover your basic needs, there are some distinct differences that will have an impact on your tone. The other day I was reminded of a High Gain Mod I designed for the Marshall JCM900 Dual Reverb (Models 4100 and 4500) in 2015. I bought my Champion 600 in 2008 (about). I have built several amps from kits and from scratch. And amplifier 'mod merchants' lure us over to their benches with Svengali promises of sounding like the latest guitar hero. But this ton stack will give you a 7dB drop in volume without the LPB1 gain section so you'll only want to use it with an effect that has plenty of volume already. The legendary Spinal Tap axeman recorded the studio version with his 1959 Les Paul Standard into a JCM800. 1 product rating 1 product ratings - Axe Heaven Marshall Half Stack Scale Miniature Collectible Amp - MS-AMP2-1 $35. Introduced in 1964, the Model 1962 combo was forever immortalized on the strength of one album — John Mayall’s Blues Breakers Featuring Eric Clapton. You'll figure this out if you do these mods. Second, the conventional TMB tone stack used by Fender and Marshall (and many other amps) are highly interactive. Original Marshall 1/4" Speaker Cable for Mini Stack MG15 MSII MG15CFXMS. Vajra 18 - an 18watt variant with a TMB tone stack by Mark Durham Watkins Dominator - reputedly the "source of inspiration" for the original 18watt circuit For those who like to experiment, here are some alternate tone control circuits to try in the 18watt circuit: Page Supro Tone Control; Fender (5F2-A / 5F3) Tone Control. Contact me for a quote. A standard Fender tone stack uses 0. The new caps have corrected values to open up the tone and get rid of that boxy sound. The tone stack has a very wide range and we have found it works great with all types of pickups including active. 29 shipping. The above is truly the "secret" of great amp tone. Changing these tone stack capacitors adds Marshall-like midrange. Point to point tube amp construction with the best available parts, nothing compromised and. First is a Chrome Dome Blues Jr Deluxe. Note: The first four mods listed above (Clipping diode removeal, Tone stack, Cathode By-pass and Presence Control mods) I now refer to as the Stage I mods, in order to differentiate them from the new set of mods that I call the Stage II mods. There's a bit more treble and bass on tap, and the midrange control is powerful enough to overdrive some otherwise clean settings when maxed out. The Ultra mode has an even fatter, more robust tone. Amp Guys have a number of 'vintage friendly' mods and overhauls that we can adapt to your stock Marshall, Fender or other style amplifier. amp's tone stack. Loosely based on the JCM 800. Tone Stack Mod und Coupling Caps: Und wenn der Amp schon offen ist würde ich unbedingt eine Modifikation des Tone Stacks empfehlen (das mühsamste an BJr Mods ist nämlich die Hauptplatine rauszukriegen ). But is not Hiwatt>Marshall in many ways? I've never had the pleasure of owning one, but I still think they're as purdy as can be: Also a word on the Dumble OD. Features The Origin has a simple interface with the standard 3 band EQ: (Bass, Middle, Treble) with a wattage output switch for dropping the watts to produce saturated. Re: Marshall 2061x : Lack of Tone Stack I have a number of cabs - 1x12, 2x12, 4x10 - all Marshalls or Marshall styled. I feel like i've talked about it, the same thing earlier. Tone stack types: Fender modern, Vox, Marshall, James (passive predecessor to Baxandall), Fender E series, Steve Bench, Hiwatt tone stack, and now the Big Muff tone stack used in FX units. Having rebuild my 5e3 clone to Tweedle Dee specs. The "master volume" control is just a standard 1M logarithmic pot chained to the tone stack just before the phase inverter - which is a typical "volume" control in other amps of this design. My amp tech looked over the Blue Guitar stuff and, after we talked over what I liked about the amp already, he advised me to just go with the input mods and try it out. The Equinox Overdrive project is a clone of the Marshall Guv'nor / Drivemaster. r/ToobAmps: A place for tone seekers to discuss tube amps and analog goodies. So the recent Fender Custom Deluxe '68 Silver Face amps advertise that the "Custom" channel on the left has a "Bassman tone stack. The tone stack was designed using some really nice simulation software. Later on Marshall started using the 33k/500pf combination, and this is the one used on the 1959slp, 1959HW and 1987x reissue amps and basically all their flagship Lead models since 1968. I happen to own a 1971 100W Marshall Super Lead modded by Kolbe with ALL his mods in one amp ( kinda like what Steve Vai's amp in the video is ALL Arredondo's mods in one amp on his 1975 100W Marshall Super Lead ), and some of Kolbe's mods are completely UNIQUE and Forward thinking. and made the reverb/trem work on the norm channel. More on that below. In many Marshall amps the tone stack is after every thing else in the pre-amp. The SLO has 7 gain stages before the phase inverter, and it doesn't have to be cranked to sound good, due to an ingenius preamp design. About the different models: The Peavey 5150 should need no introduction. Most guitarists have a pretty good idea of what classic Marshall tone is (or at least should be). For "Marshall-izing" a channel, my personal opinion is that you might get some of the tone with some tone-stack changes, but that still misses the feel part of it. This mod was done by me to several amps in the Omaha area for a music store ther that I did repair work for. There's a bit more treble and bass on tap, and the midrange control is powerful enough to overdrive some otherwise clean settings when maxed out. I'm using Duncan's Tone Stack Calculator to do this. The mod also slightly increased the gain of the amps. The D umble circuit that I have indicates that it is a standard Fender blackface (with the Four Way switching doing what you have shown) in the first stage (clean), with almost a standard Marshall in the ove. amp's tube power amp. I've used it with pleasing results in 3 amps now. I'm looking for lower wattage (20w and under)preferably and in the marshall vein. The Bassman has significantly influenced the whole guitar amp industry since it was introduced. Peavey 5150 / 6505 series mods. The classic Fender stack is another one in TSC. The small Martin series is fun to play and sounds amazingly good for a guitar partly made of formica! I bought my LXME for around $220 and the retail has just been going up. Marshall 2061x, does plexi at sane volume. By sliding the bass, midrange, and treble sliders in TSC, I adjusted the Marshall stack to try to match it to a neutrally adjusted Fender stack. Re: Fet version of Marshall Superlead Plexi « Reply #14 on: January 29, 2011, 07:36:39 AM » The tone stack output (J5. Pre-slice and dice: Extra vol control installed after tone stack. TONE LOCATION - This control allows you to alter the location of the tone stack. The Marshall Limited Edition Randy Rhoads Tribute Full Stack includes an all-tube 100W Super Lead head modified to the exact specifications of Rhoads' original amp. I found spots where I need to connect to the B+ as well as the ground. The diagram and the article describe the so-called FMV tone stack; the design used by Fender, Marshall, and Vox, and the hundreds who followed in their footsteps. It's an overdrive with a 3-band tonestack, and it was among the first overdrive pedals to use this type of tone control, allowing for more amp-like toneshaping via bass, midrange and treble knobs. 022 mid cap with a. FMV tone stack. The mod also slightly increased the gain of the amps. I don't mind the single tone knob, but then again, I spent most of my playing life with a non-TB AC30, so I'm very used to playing amps with limited tone controls. With this mod, these amps hang in there with modern German and American amps, without loosing its marshall pedigree. Coupling Cap Installation, 4. Replace the. Introduced by Fender in 1957 in the 5F6 Bassman, it was later copied by Marshall, Vox, and many other guitar amplifier manufacturers [2]. Artists such as the Rival Sons’ Scott Holiday and Marcus King choose Orange for this very reason! Orange is the Voice of Analogue. Marshall even provides the holes in the PC board to mount it. Mini amp 20 watt hybrid (the Marshall type) with an 8 inch cab Does come with power supply and cable for the cab. I thought some here might be interested as well. Bias Control Installation, 7. Tone Stack, the type of tone stack used on this amp is the typical modified Baxandall style stack Carvin uses in all of it’s modern tube amps. This modification is based on the typical front end of a Marshall 2204-style head and approximates its gain control set to about 60 percent. Looks like it has only 2 inputs. Built using the best hand picked electronics sozo capacitors for the tone stack. Modifying the tone stack. Twin Stack Mod, 6. So you'll need to download the FREE Adobe Acrobat Reader via the link below to be able to view schematics. Mini amp 20 watt hybrid (the Marshall type) with an 8 inch cab Does come with power supply and cable for the cab. Jun 26, 2017 - Fender/Marshall/Vox Treble/Mid/Bass tone stack by RobRobinette. One thing to note - NONE of these involve modification to the original Marshall circuit. The other day I was reminded of a High Gain Mod I designed for the Marshall JCM900 Dual Reverb (Models 4100 and 4500) in 2015. The tone stack was already there, just non-adjustable. Uses four KT-66 output tubes. Because of its ubiquity, the circuit is very well understood with extensive analysis and documentation widely available. By nature, the DS-1 is fizzy and inarticulate, making the tone stack unusable in most live situations with its stock scooped midrange. Re: Blackface Bassman Marshall Mods DannyR8, I have never done this to an AB165 or later Bassman, but I do it to two channel FEnder reverb amps' Normal channels often. Change the voltage divider to a 1 meg and 220K. I run the II with ultra-low and bright on, bass and mid a little north of noon and treble straight up through an Ampeg 8x10. It's no sweat to break $2,000 on a decent half stack, but many of the brands making top-of-the-line head and cab pairs also make lower-wattage combos that deliver similar tone below $1,000. I posted this at the Les Paul Forum because a few asked for it. guitar wiring mods at DuckDuckGo Stratocaster tone split mod. The Dumble tone stack is pretty responsive. 2 250pF caps in parallel effectively make a 500pF cap. I have the Billm Cool Mod and the Twin Stack Mod on mine and love it. There isn't much treble being used, increase that to, in effect, reduce the bass. This channel matches up well with my humbucker & p90 guitars. Pulled = tighter with more snarl and aggression. For "Marshall-izing" a channel, my personal opinion is that you might get some of the tone with some tone-stack changes, but that still misses the feel part of it. You may want to change the slope resistor to 56k and remove the. There is a volume increase when the mid pot is turned up. Now you can easily add this unique master volume to your 60s/70s/80s Marshall, Marshall clone, or any amp that has a cathode follower before the tone stack (EQ controls). his right hand man at the time Eric, still is around and can. The Friedman amps are 3/4 tube gain stages depending on mode and all the 100w are pretty much variations on the same basic circuit. Amp Mod Kit - MOD® Kits, Tone Stack Mod This kit converts the TMB tone stack of a blackface or silverface amp to a modern aggressive voiced tone stack. About the different models: The Peavey 5150 should need no introduction. if you are open to non-mod solutions, any sort of preamp or. This bad boy is running on 6v6's with an upgraded output transformer. , this little amp is my grab and go amp, but like most users I tend to favor the "Bright" channel with the tone pot and been looking for a simple way to mod the "Normal" channel for a Dumble Clean stack sound. In the Original schematics of a Marshall amp in the tonestack the 22n is conected to the wiper of the Mid Pot. all i did was lift the legs on the r7 and r19 resistors. The Friedmans do have the sat switch which is diode clipping, but it isn't on a pre-tone stack master like the Jose stuff. From the moment you plug in, the DSL provides you with the functionality you need to take your sound from rehearsal to the studio with confidence. This is the standard Fender/Vox/Marshall tone stack. With the distortion available, it feels considerably louder than a cleaner amp, such as the 4W WF-55. The three knob tone stack has been around since the beginning of bass amplifiers. Tone stack is closer to stock Marshall so it has more of that "kerrrrrannggg" that people love instead of a scooped fizzy mess. 6k fitted) tone is now much smoother and sweeter whereas before it had a harsh edge to it. I'll show you how to add a Gain Control, a. Slash has always been associated with Marshall amps and has used various models over the years including two signature heads: the Marshall JCM 2555 Slash and the Marshall AFD100 which is supposed to capture the tone from the Appetite For Destruction era. Orange has a 51 year history as an all-analogue amp builder. During the last decade, the market has been flooded by affordable tube amps in all price ranges and while most of them will cover your basic needs, there are some distinct differences that will have an impact on your tone. A Useful Mod' for DC-coupled cthode followers: It is very common to see a DC coupled cathode follower in a guitar amp, often before a tone stack. The top cabinet has the top two loudspeakers angled slightly upwards, giving the Marshall stack a distinctive appearance. the second one a cathode follower (to feed the tone stack) and the PI. 2 released - includes the Big Muff tone stack. Tone stack types: Fender modern, Vox, Marshall, James (passive predecessor to Baxandall), Fender E series, Steve Bench, Hiwatt tone stack, and now the Big Muff tone stack used in FX units. Tone Stack Options: "Mid Shift" and "Deep" 2. Why hello! It is our old friend, the Fender/Marshall tone stack, as it appears in a Marshall JCM800. A typical plexi circuit looks a lot more like a vox circuit (top boost). However, because the bass response in this pedal is so robust, you can easily balance the extra treble after removing the cap. I built this amp from the ground up with Classic Tone transformers. Tone control placement has an effect on the sound of an amp that has lots pre-amp distortion is present. Looks like the 70s D models sound very good with strats. In the TubeMeister Deluxe 20 and 40, the cathode follower stage is largely responsible for shaping the brown sound, as this most popular flavor of tone has come to be known. 99 Trending at $41. Just to level set things, I ll use the SVT II as my reference tone. The Feel control on Gain 1 is a push-pull and when pushed = full gain and low-end response. Contact me for a quote. Sadly, we are seldom offered the opportunity to turn the volume above 3 on a Twin Reverb. With this mod, these amps hang in there with modern German and American amps, without loosing its marshall pedigree. There is a volume increase when the mid pot is turned up. a simple method of achieving this is to place a variable CR network between the voltage amplifier and the power amplifier stages, The value of C1 is chosen to pass the higher audio frequencies, this. Here is a collection of schematics of (and related to) the 18watt amp. The mods include the following sections, of which any or all may be completed: 1. "We have designed countless Mods since 1998. Follow Us. There isn't much treble being used, increase that to, in effect, reduce the bass. Why hello! It is our old friend, the Fender/Marshall tone stack, as it appears in a Marshall JCM800. Modifications are most common on tube amplifiers. Check out what happened to it. marshall modding experts assemble I've got an idea in my head of converting an old (early 70s?) 100w super PA into a dual master volumed beast of a marshall. Uses four KT-66 output tubes. This channel produces pure Marshall crunch in spades, and what’s really amazing is that it can do it at any volume. to get the tone to match. Here's how it looks: The tone stack. However, because the bass response in this pedal is so robust, you can easily balance the extra treble after removing the cap. Third, the rest of the preamp (and power amp and power supply) plays a big roll in setting the voice of the amp. TubeMeister Deluxe’s take on this tone is based on the tone of the TriAmp Mark 3‘s channel 2B, which in turn was inspired by the sound of a hot-rodded Marshall. Axe Heaven Marshall Full Stack Scale Miniature Collectible Amp - MS-AMP3. During the last decade, the market has been flooded by affordable tube amps in all price ranges and while most of them will cover your basic needs, there are some distinct differences that will have an impact on your tone. Different tone cap values on each tone pot. If you look closely you'll see there isn't much difference between the Marshall circuit and the Nomad Ch3 circuit. I'll probably use the worthless "texture" control for the FAC. El34 power and 12Ax7 Pre tubes. This early 70's YSR-1 Custom Reverb has similarities with a 100W Plexi, but with the main difference of a Fender-like tone stack with only Treble and Bass controls. Out of the box, the sound was very dark and un-interesting. Typical mods include master volume, triode modifications, and tone stack mods. So we gave you a finely tuned Marshall-style 3-band EQ. The results are what sounds like an increase in gain and a slight difference in feel, and obviously the tone controls become redundant. The older Marshall circuits don't have less sizzle or distortion just less mid-range which makes that sizzle or distortion more apparent. Ok maybe not a Marshall mod but a Hiwatt. It's no sweat to break $2,000 on a decent half stack, but many of the brands making top-of-the-line head and cab pairs also make lower-wattage combos that deliver similar tone below $1,000. ; TRex MOSFET Switch - specific implementation. If you change the components to something else, it will perform like the TSC says it will - FOR THE TONE STACK ITSELF. The mids are quite pronounced as well. On the lower edge of the pic you can see a modern power-resistor inside a bronze colored heatsink that was added lately because the original 25kOhm power-resistor. 02 cap in the "middle" (actually the bass cap) is usually a. You turn up any knob and you really hear the changes in tone. Way too much gain, too little decoupling, lousy tone stack. Remove these and install two 0. I feel like i've talked about it, the same thing earlier. This is my favorite and most useful amp mod, a three-way SPDT ON/OFF/ON mini-switch gives you: Normal feedback / No Feedback / Heavy feedback. I'm using Duncan's Tone Stack Calculator to do this. Let’s start with changing a few things in the tone stack (Photo 1), starting with the capacitors. I recently acquired a 1985 JCM-800 1-12 combo and the difference is night and day when compared to the DSL-401. The Friedman amps are 3/4 tube gain stages depending on mode and all the 100w are pretty much variations on the same basic circuit. Those looking for an EVH brown sound like tone might find this mod particularly useful, and its nice as it is very simple to perform, and easy to engage. Treble MEANS treble and bass means BASS. Can anyone offer a brief TONE summary between the different OTS types please? The Bluesmaster looks cool as many of the mods are already done, including moving the OD trim to the rear panel- I'm leaning towards more of a 'Marshall' tone than anything. I know I can run pedals thru it to get there and if thats the only way so be it. FMV tone stack. Having rebuild my 5e3 clone to Tweedle Dee specs. The classic Marshall Tone stack tends to emphasize the upper mids, which in turn tends to drive into distortion sooner in that layer. The preamp is currently fairly awful. Second, the conventional TMB tone stack used by Fender and Marshall (and many other amps) are highly interactive. Uses four KT-66 output tubes. Those looking for the true Marshall sound only need use an original, unmodified Super. The Dumble tone stack is pretty responsive. The tone stack was already there, just non-adjustable. In my opinion, the classic mod is the way to go for a Princeton Reverb and an archtop. Again, the untrained eye can see the difference between the two. The treble bleed ceramic cap was raised from 250pF to 470pF. Reverb approx. Having rebuild my 5e3 clone to Tweedle Dee specs. That is where many amps get their distinctive sound. Instructions to perform the mods are included. A quick and easy way to try the Tone Stack Lift circuit! What you are looking at is the back of the Middle pot on a Metroamp 69 plexi kit. It will turn your amp in to the more Ampeg VL/Metaltronix kind of range. The alarming aggressiveness and snarling sustain Clapton conjured from his Les Paul Standard/Marshall setup was startling, and became ground zero for god-like rock guitar tone. I can make these amps sound #spectaculair#. SPECIAL PRODUCTS. Tone Control, shown in its most basic form in Fig. The Treble cap is replaced with a high quality Silver Mica cap. 99 eBay determines this price through a machine learned model of the product's sale prices within the last 90 days. Spring reverb has been added, along with several other user demanded mods. Tap into burly Marshall tone anywhere from your bedroom to the stage, with the Marshall DSL40CR tube combo amp. The Parametric EQ sweeps out some low-mid "boxiness" and gives a more modern sounding metal tone. Recommended starting point: Try setting the Tone Control at about 10 o’clock and. Blackheart BH-15 mods This page covers the mods I’ve made to my Blackheart BH-15 valve amp. 022uf Mallory 150's Change to. Bassman Mods. The diagram and the article describe the so-called FMV tone stack; the design used by Fender, Marshall, and Vox, and the hundreds who followed in their footsteps. The design of the JCM800 1986 and JCM800 1992 amps departed from the "classic" Marshall Bass amp design and incorporated a better tone stack with a mid sweep and a slope control not found on the older JMP 1986 and JMP 1992 amps. The mods include the following sections, of which any or all may be completed: 1. And amplifier ‘mod merchants’ lure us over to their benches with Svengali promises of sounding like the latest guitar hero. Not sure why Marshall doesn't stray from convention and make a 1974x with a tone stack. Ken Fischer and Gerald Weber talk about the tone stack on the Bassman, and how it deviates from the schematic in practice. Can anyone offer a brief TONE summary between the different OTS types please? The Bluesmaster looks cool as many of the mods are already done, including moving the OD trim to the rear panel- I'm leaning towards more of a 'Marshall' tone than anything. 1uF capacitor feeding the ‘Treble’ control, to more guitar friendly values. However, the extra bass this mod provides reduces overall clean volume of the amp a little. Step 3, replacing the ubiquitous. The "master volume" control is just a standard 1M logarithmic pot chained to the tone stack just before the phase inverter - which is a typical "volume" control in other amps of this design. and comparing with the moded tone stack with the marshall specs. 1983 Marshall 800 2203 Mike Morin modded amp. Marshall Plexi Clone. 25uF capacitors in the tone stack, and the. If you do not see your amp listed please contact us!". All the files at Schematic Heaven are in Adobe Acrobat form. This is the holy grail of Marshall crunch tone; sounds like a full stack on the bleeding-edge, yet at a volume that is perfect for a club gig, or for recording! The clean channel is equally surprising. Most guitarists have a pretty good idea of what classic Marshall tone is (or at least should be). I have looked through tons of forums concerning this, however most focus on the ab165 circuit. It's an overdrive with a 3-band tonestack, and it was among the first overdrive pedals to use this type of tone control, allowing for more amp-like toneshaping via bass, midrange and treble knobs. Remove these and install two 0. Adding the aforementioned mods turns it into a fire-breathing, high-gain pedal that sounds more amp-like and can turn any clean amp into a gained out monster. It is more or less a Marshall style tone stack this allows tone shaping of the OD. Fender/Marshall/Vox. 12" speaker is going to be a tight fit. 5) From V2B, the signal then leaves and enters the Tone Stack 6) The Tone Stack is where the Treble, Midrange and Bass knobs do their thing. Original Fender Strat Accessory Kit - Aged. Tone stack is closer to stock Marshall so it has more of that "kerrrrrannggg" that people love instead of a scooped fizzy mess. Sadly, we are seldom offered the opportunity to turn the volume above 3 on a Twin Reverb. Schematics. It took a while to dial it in, I guess the Marshall tone stack works much different then what I'm used to. On the graph below the top line is the Marshall tone stack and the one below is the one from this amp. Re: Fet version of Marshall Superlead Plexi « Reply #14 on: January 29, 2011, 07:36:39 AM » The tone stack output (J5. 1 released - now includes the Steve Bench tone stack and some other tweaks. A typical plexi circuit looks a lot more like a vox circuit (top boost). Again, the untrained eye can see the difference between the two. It is a Cathode Bias, all-tube design using a tube rectifier. Some of our restorations include: re-voicing your tone stack, Pre-CBS Conversions, Tweed Conversions, Blackfacing your Silverface circut, restoring your tweed circuit, and even De. This is a great mod for pretty much any amp with a TMB (treble mid bass) tone stack. See the schematic for the conections. I recently acquired a 1985 JCM-800 1-12 combo and the difference is night and day when compared to the DSL-401. Behind the mic stand, you can see the panel of the 3rd head. This early 70's YSR-1 Custom Reverb has similarities with a 100W Plexi, but with the main difference of a Fender-like tone stack with only Treble and Bass controls. But this ton stack will give you a 7dB drop in volume without the LPB1 gain section so you'll only want to use it with an effect that has plenty of volume already. One or other should do same thing. tsc Tone Stack Calculator file (you must select the "Marshall" tab after loading the file). 1uF capacitor feeding the ‘Treble’ control, to more guitar friendly values. Later Parks were occasionally used to test mods or tricks, or became clearing houses for leftover components after Marshall models moved to other specs (witness the prolonged use of “lay-down” transformers or a few hand-wired circuit boards in Parks several months after Marshal had gone to printed circuit boards in 1974). Pulled = tighter with more snarl and aggression. is one of the largest makers & suppliers of musical instruments, amplifiers & professional audio systems worldwide. When Marshall copied the Fender 5F6-A Bassman almost verbatim to create the JTM45 amplifier the Fender TMB tone stack came with it and it's still being designed into new amps today. My first Marshall, after years of going for other amps and going after the "Marshall Tone". From the moment you plug in, the DSL provides you with the functionality you need to take your sound from rehearsal to the studio with confidence. Peavey Switchable Circuit Mods; Marshall JCM800 2204 Power Amp; Fender Bassman Tone Stack; Hiwatt Fixed-Bias Phase Inverter; Matchless DC-30 Pentode Preamp; Supro Design for 6973 Power Tubes; Hiwatt CP103 Tone Stack; Fender Vibroverb 6G16 Tremolo; Fender Parallel 12AT7 Reverb Driver; Ampeg Design for 7591 Power Tubes; Rickenbacker Grid-Leak Bias. Just to level set things, I ll use the SVT II as my reference tone. The above is truly the "secret" of great amp tone. The Dumble tone stack is pretty responsive. "We have designed countless Mods since 1998. You need to get your chops together before you hit the stage, and that means grinding your fingers with constant practice. Les Paul Lover Duke of Orange Posts: 6779 Joined: Tue Aug 18, 2009 9:08 am Location: Derby, England. The mod also slightly increased the gain of the amps. The new caps have corrected values to open up the tone and get rid of that boxy sound. The Marshall Limited Edition Randy Rhoads Tribute Full Stack includes an all-tube 100W Super Lead head modified to the exact specifications of Rhoads' original amp. Smaller and louder than the original, it offers extra tonal flexibility through a Texture control, a three-way Mode toggle switch, and second footswitch bypasses the Tone stack. El34 power and 12Ax7 Pre tubes. It was founded by the late drum shop owner and drummer Jim Marshall, and is now based in Bletchley, Milton Keynes. I don't necessarily think a Plexi or JCM800 sounded better than the JVM, but they had their own voices and that's something I wanted alongside the JVM, so I determined the necessary mods to get that and did them. 1: 24/10/99: Version 1. 047 µF capacitors. This site features a tube data search engine and best of all, a Tone Stack Calculator. The way a 2203 is laid out, it's not really a true "master volume" amp at all. Here's a French article I found a while back. Treble/Bass tone stacks usually have a "tail" resistor that connects the tone stack to ground, like 6K8 for Fender Princeton (in the case of the Twin Reverb, it's a 10K Mid pot), or higher value for Marshall (like 25K Mid pot). Adding the aforementioned mods turns it into a fire-breathing, high-gain pedal that sounds more amp-like and can turn any clean amp into a gained out monster. I posted this at the Les Paul Forum because a few asked for it. Marshall's generally do not feature great lush sounding MOD spring reverb. Fender Brand Original Stratocaster Aged Accessory Kit. back to TubeAmps2. Code of conduct. 68uF bypass cap on V2 to drop the gain down a little if it's too much. Take a Les Paul with a Gibson T-Top (or custom-made replica) in the bridge and PAF replica in the neck, flip your pickup selector switch to the middle, string up with Ernie Ball Super Slinky strings (those are 8s, use 9s at the most), plug into a plexi-ish amp with those settings running into a Marshall cab with Celestion Greenbacks, and you should be well on your way to getting a Page woody!. Like the later Bass and PA amps, the early amps (## 2-6) all have a warm tone with plenty of bass. 68uF cathode bypass cap on the first gain stage with a 5uF cap. Also during this period, the 1987 Lead and 1959 Super Lead model circuits were updated. I recently acquired a 1985 JCM-800 1-12 combo and the difference is night and day when compared to the DSL-401. This modification is obviously deliberate, and it has substantial effects on bass and low-midrange response. The Marshall Limited Edition Randy Rhoads Tribute Full Stack includes an all-tube 100W Super Lead head modified to the exact specifications of Rhoads original amp. It can be downloaded here. Good for ribbon cable replacement ! Your mod changed the way the tone stack reacts, there are many mod you can try there, and listen to the result. You need to get your chops together before you hit the stage, and that means grinding your fingers with constant practice. Looks like it has only 2 inputs. That's why one of my suggested mods was to remove the 'fake' tone stack and then there is no need for V2A, the cathode follower, because it's only purpose is to drive the tone stack, and it adds no gain of its own. My Marshall Jaguar 20 watt head originally had only a tone and a volume control. The DSL20H TM is for those who need the full rich tone of a valve amp in a compact and portable format. Phase inverter passes more low-end than stock Marshall. My amp tech looked over the Blue Guitar stuff and, after we talked over what I liked about the amp already, he advised me to just go with the input mods and try it out. Changing the tone stack's slope resistor from 33k to 56k, will reduce mids, rather than treble. Smaller and louder than the original, it offers extra tonal flexibility through a Texture control, a three-way Mode toggle switch, and second footswitch bypasses the Tone stack. Setting your mid pot will affect your treble too. I remember when Bernie played one of those little beasts at Anderton´s. Marshall MG15MSII Microstack is a complete Marshall stack that will fit into any room. Download the 5F6-A. I will build to spec from kits or from scratch. Tried and true, it has fairly high gain loss and big mid scoop. Maybe I'll solder it up like this next time I change strings. Typical mods include master volume, triode modifications, and tone stack mods. This preset tone network is the only difference I can see between OD1 and 2. Its 15W head and 2 - 10" speaker cabinets create a stack that is only 15"W x 37"H x 9"D, but the Marshall MG15MSII Micro Stack puts out a tone that's far from miniature. 22uF will change how V1-A works : less bass, asymmetric clipping, a little less gain (R8 = 82k) ; you could try it while keeping your tone stack as is (modded). Re: Marshall 2061x : Lack of Tone Stack I have a number of cabs - 1x12, 2x12, 4x10 - all Marshalls or Marshall styled. This circuit to the left was featured in several Gibson amps of years past and produces a notch or band-reject in the frequency spectrum (around 450Hz). Tone Stack Mod und Coupling Caps: Und wenn der Amp schon offen ist würde ich unbedingt eine Modifikation des Tone Stacks empfehlen (das mühsamste an BJr Mods ist nämlich die Hauptplatine rauszukriegen ). “PRE” places the tone stack at the input to the amp, “POST” places the stack between the preamp and power amp. Original Marshall 1/4" Speaker Cable for Mini Stack MG15 MSII MG15CFXMS. Features The Origin has a simple interface with the standard 3 band EQ: (Bass, Middle, Treble) with a wattage output switch for dropping the watts to produce saturated. So I went looking for an analog front end pedal that would replicate the preamp and tone stack of a Marshall - and here was the DLSIII, seemingly custom tailored for my needs! You can certainly use it as a conventional dirt pedal in front of a clean amp, and that's what it was designed for. Here is the components explained in the TT JTM45 layout Lets start from the right, where also the signal begins. The only other difference is the slope resistor on the input. This is a convenient spot to install a pre-phase inverter master volume, because it is easy to lift the wire coming off the wiper of the treble pot and insert a 1Meg pot. The three knob tone stack has been around since the beginning of bass amplifiers. It is more or less a Marshall style tone stack this allows tone shaping of the OD. By sliding the bass, midrange, and treble sliders in TSC, I adjusted the Marshall stack to try to match it to a neutrally adjusted Fender stack. The gain can be increased or decreased depending on the relative values of the 470k resistors. Marshall Amp Schematics to assist you with your amplifier repairs and modifications. why? So if I bypass IC12b all together, I don't even need R91/R92 and C51 I'll have it like a true marshall amp, drive the tone stack *direct* from CF!. The thing I like most about it was that it gave me that modded Marshall tone for around $100 and you can keep your amp clean from holes. Shop our selection today!. The speculation is useing the hi-fi stack vs the guitar amp stack. I’ve been eternally impressed ever since. Horseheads, NY 14845 "Established 1998" Voodoo Amps® has provided Pro Tone to the biggest names in the music business since 1998. Personally when I modify a tone stack, I usually mess with the caps instead of the slope resistor. Line 6 JTS-45 - Since the design of early Marshall® amps were based on the Fender® Tweed Bassman® circuitry, we wondered what it would be like if we took the preamp and tone stack of our JTM 45 and ran it into the power amp and transformer of our ‘58 Tweed Bassman®. Fender/Marshall/Vox. Peavey Switchable Circuit Mods; Marshall JCM800 2204 Power Amp; Fender Bassman Tone Stack; Hiwatt Fixed-Bias Phase Inverter; Matchless DC-30 Pentode Preamp; Supro Design for 6973 Power Tubes; Hiwatt CP103 Tone Stack; Fender Vibroverb 6G16 Tremolo; Fender Parallel 12AT7 Reverb Driver; Ampeg Design for 7591 Power Tubes; Rickenbacker Grid-Leak Bias. Phase inverter passes more low-end than stock Marshall. El34 power and 12Ax7 Pre tubes. highs, mids, or lows. Changing these tone stack capacitors adds Marshall-like midrange. i found that the first one sounded Fenderish an the second almost like a real Marshall. This is the holy grail of Marshall crunch tone; sounds like a full stack on the bleeding-edge, yet at a volume that is perfect for a club gig, or for recording! The clean channel is equally surprising. Unnervingly, if you see it enough it even begins to make sense. r/ToobAmps: A place for tone seekers to discuss tube amps and analog goodies. For the icing, I put in an ALNICO Weber 8 inch. Voodoo Amplification, Inc. The speaker in the pics is an old, tired, fender speaker - doesn't sound good in this amp. The Parametric EQ sweeps out some low-mid "boxiness" and gives a more modern sounding metal tone. Take a Les Paul with a Gibson T-Top (or custom-made replica) in the bridge and PAF replica in the neck, flip your pickup selector switch to the middle, string up with Ernie Ball Super Slinky strings (those are 8s, use 9s at the most), plug into a plexi-ish amp with those settings running into a Marshall cab with Celestion Greenbacks, and you should be well on your way to getting a Page woody!. The Equinox Overdrive project is a clone of the Marshall Guv'nor / Drivemaster. Class A; Push Pull 6V6 – enriched fixed bias; Single channel: Treble, Mid, Bass. Bassman Mods. Original Fender Strat Accessory Kit - Aged. The three best-known tone stacks are one knob (like the Fender Champ or Tweed Princeton), two knob (like the Fender Twin), and three knob (like the Fender Bassman or Marshall JTM45). The site is still in beta, some functions might not be fully implemented and a lot of things require polishing, but the basic functionality of creating and sharing Marshall CODE presets works along with the unique web2amp function that allows you to directly load the settings for a selected. There is some likelihood, however, that lifting the ground connection on mid-shift type "contour" controls (found on many solid-state low-to-mid power amps from Fender, Marshall, Crate, and on some of the Marshall pedals) will produce the desired effect. Amp Kit - MOD® Kits, MOD101 guitar amplifier - MOD 101 Guitar Amp Kit Features: All Tube Design (solid-state diodes used only for full-wave rectification) 60W output power into 4, 8, 16 and 20 Ω 1 channel with customizable: tone stack, power tubes, negative feedback, input miller capacitance volt divider/LP filter, and preamp cathode bypass cap (all parts included) Vintage. See the schematic for the conections. I've modded that amp according to the schematics by Lyle Caldwell, changed the tone stack and the input impedance and added a choke. Marshall JCM900 Dual Reverb mod The other day I was reminded of a High Gain Mod I designed for the Marshall JCM900 Dual Reverb (Models 4100 and 4500) in 2015. Setting your mid pot will affect your treble too. Like the later Bass and PA amps, the early amps (## 2-6) all have a warm tone with plenty of bass. Marshall MG15MSII Microstack is a complete Marshall stack that will fit into any room. I have now A/B'd the BC30 clean alongside my lovely sounding WEM Dominator 25 (with original Mullards) and I can say that we are defiantly in the same ballpark now tone-wise, about 97% I put this down to the "20W Marshall 2022" mod to R5 and R6 changing the frequency response across their 470pF into the second stage. Standby Switch Installation, 2. Replace the. Vintage or new, boutique or not, let's talk about the sweet tone makers. Add an SPST ON/OFF mini-switch to the Middle tone pot's ground. Maybe I'll solder it up like this next time I change strings. I have several combo amps that I'm looking to sell or trade towards preferably heads but open to combos. Oh yeah, I took out the negative feedback. Changing the tone stack's slope resistor from 33k to 56k, will reduce mids, rather than treble. Marshall JCM 900 mods? Post by PCollen » Tue Apr 17 I have used some of this info on my fenders, but I have not tried on any marshall, but I think the book is worth the money. Just want to mix up my amp tone a bit without having to go stupid crazy spending money. Both are 2 cascading triodes, followed by a cathode follower, into a FMV tone stack (TMB instead of Vox's TB), into a LTP phase. By sliding the bass, midrange, and treble sliders in TSC, I adjusted the Marshall stack to try to match it to a neutrally adjusted Fender stack. It will accept your guitar input via a 1/4" phono jack. Amp Guys can do that. What a tone he had that very day. I haven't tried any of the mods yet but will probably give replacing the ceramic caps in the signal path a go sometime (and the elec caps in the power supply), doing that to my Marshall 9005 improved the tone a treat. 003uf cap right next to it instead. and made the reverb/trem work on the norm channel. User review from iamqman about Boss SD-1 SUPER OverDrive - Modded by Keeley : Great booster OD However, Keeley does include a manual for his 5 start tone stack which what he calls his mod to this pedal. 680pF) are different from the Red channel. Marshall JCM900 Dual Reverb mod The other day I was reminded of a High Gain Mod I designed for the Marshall JCM900 Dual Reverb (Models 4100 and 4500) in 2015. It looks like a tweaked Marshall tonestack and preset level. Gemtone Amplifiers-combines years of experience in the music industry and Craftsmanship to obtain the "Perfect Tone". By replacing the bass and middle pots with resistors you are left with just the treble control. We'll go from the 1962 Bluesbreaker model all the way up to the JCM900 Dual Reverbs. I would like to keep the mod completely reversible for value of the amp. what dou you think?. Out of the box, the sound was very dark and un-interesting. Part of the fun of a 220x circuit, at least the ones I've played (presently have a Ceriatone 2202 for that), is the way it responds to your playing. Marshall also raises the values of C 2 and C 3 by 10 percent, from 0. still that nice Marshall crunch and mid range, but much more "omph" to it. Amp Mod Kit - MOD ® Kits, Tone Stack Mod. And amplifier 'mod merchants' lure us over to their benches with Svengali promises of sounding like the latest guitar hero. The above is truly the "secret" of great amp tone. Where nearly every single Marshall amplifier ever made has a status that every guitarist knows about. The speculation is useing the hi-fi stack vs the guitar amp stack. The tone stack has a very wide range and we have found it works great with all types of pickups including active. Comes with the head and 1976 Kustom Cab with alnico. 300ms; Mod. There are a couple of patents/applications regarding digital simulation of the tone stack. After referring to my Tube Amp book, using the Plexi normal input with the JTM45 tone stack would get you closer. The new names more accurately represent the actual D topologies and avoid confusion of what "70's-80's tones" mean. This channel produces pure Marshall crunch in spades, and what's really amazing is that it can do it at any volume. Here's a French article I found a while back. Les Paul Lover Duke of Orange Posts: 6779 Joined: Tue Aug 18, 2009 9:08 am Location: Derby, England. Phil, great data plots, and a good way of showing the differences between the various tone stacks. back to TubeAmps2. I mostly use single coils on it and run the mids higher and the treble a little lower on these amps for fat classic rock tones that work well for rhythm and leads. For "Marshall-izing" a channel, my personal opinion is that you might get some of the tone with some tone-stack changes, but that still misses the feel part of it. These heads don’t have a very good reputation, so can be bought for relative little money. Voodoo Amplification, Inc. It is brighter and harsher sounding and the overdrive is not the same. I recently acquired a 1985 JCM-800 1-12 combo and the difference is night and day when compared to the DSL-401. Related Links. It's an overdrive with a 3-band tonestack, and it was among the first overdrive pedals to use this type of tone control, allowing for more amp-like toneshaping via bass, midrange and treble knobs. Well, this book answered all of my questions and opened up some exciting possibilities for getting mo'better tone out of this amp: brownface or tweed tone stack mods, marshall preamp mod, dual reverb, different caps and values for different channels, channel bridging, which types of tubes to consider for more warmth. 2 250pF caps in parallel effectively make a 500pF cap. Eleven MK II The Amps. The Feel control on Gain 1 is a push-pull and when pushed = full gain and low-end response. Bias Control Installation, 7. After experimenting with lap steel with Alumitone pickup, I narrowed it to: 1M volume pots C5= 250pF SM C6=. - Dullness cap removal on Channel 3. I have now A/B'd the BC30 clean alongside my lovely sounding WEM Dominator 25 (with original Mullards) and I can say that we are defiantly in the same ballpark now tone-wise, about 97% I put this down to the "20W Marshall 2022" mod to R5 and R6 changing the frequency response across their 470pF into the second stage. Different tone cap values on each tone pot. Treble MEANS treble and bass means BASS. Way too much gain, too little decoupling, lousy tone stack. Marshall BB-2 Bluesbreaker from small metal series. Peavey Electronics Corp. I will build to spec from kits or from scratch. This seems to be the far right stack. Also during this period, the 1987 Lead and 1959 Super Lead model circuits were updated. what dou you think?. The 5E3 tone control is a low-pass filter and (as designed) reduces so large a portion of the mid-high audio spectrum that more than just a bit of counter-clockwise rotation results in a significant loss of gain - enough so that any overdrive is lost while everything other than the bass frequencies remain. I built this amp from the ground up with Classic Tone transformers. See the Tone Stack Mods link. Re: Can anyone offer a brief TONE summary between the different OTS types please? « Reply #12 on: July 31, 2014, 06:32:20 PM » I play a big fat esquire a lot of the time, and the BM is great when you push the clean side to the edge with a nice clean boost or modify the PAB to the original value or both It's probably just what you're after. The Bassman has significantly influenced the whole guitar amp industry since it was introduced. A standard Fender tone stack uses 0. It's a fact that Mesa Engineering uses two modified forms of the Marshall tone stack for their Dual Rectifier series. The tone stack of course. Modifications are most common on tube amplifiers. The tone stack is made up of capacitors C 1, C 3, C 8, and C 9, jumper. Tried and true, it has fairly high gain loss and big mid scoop. The way a 2203 is laid out, it's not really a true "master volume" amp at all. The amp’s two channels, which can be blended together using the two volume controls, offer different tones—Channel 1 has a fairly flat tonal response, while Channel 2 is somewhat darker-sounding. is one of the largest makers & suppliers of musical instruments, amplifiers & professional audio systems worldwide. Rhoads' family unlocked the vault to Rhoads' amp and allowed Marshall's engineers to diagram the original modified circuitry. Reverb approx. Where nearly every single Marshall amplifier ever made has a status that every guitarist knows about. I happen to own a 1971 100W Marshall Super Lead modded by Kolbe with ALL his mods in one amp ( kinda like what Steve Vai's amp in the video is ALL Arredondo's mods in one amp on his 1975 100W Marshall Super Lead ), and some of Kolbe's mods are completely UNIQUE and Forward thinking. 047 µF capacitors. There are many suggestions to be found about modding the tone-stack, most seem to concern the mids - both cap and resistor, and also the mid boost. Click to open in a new window. When Marshall copied the Fender 5F6-A Bassman almost verbatim to create the JTM45 amplifier the Fender TMB tone stack came with it and it's still being designed into new amps today. It took a while to dial it in, I guess the Marshall tone stack works much different then what I'm used to. This download is the complete documentation of the famous Bill M. My Monoprice 15's tone stack is a Marshall design, and is one of the stacks in TSC, accurate to every component. This modification is obviously deliberate, and it has substantial effects on bass and low-midrange response. lowered the V1A bypass cap to 5uF/25. Standby Switch Installation, 2. It seems the designers were trying to compensate for the early tone stack placement by adding a final gain stage after a tone recovery stage, but, as you point out, putting the 470k/470pf network (you use 500pf in the MODS schematic) so late in the amp will not really duplicate the raspy sound of the 2204, which puts it after the 1st gain stage. I haven't tried any of the mods yet but will probably give replacing the ceramic caps in the signal path a go sometime (and the elec caps in the power supply), doing that to my Marshall 9005 improved the tone a treat. It was founded by drum shop owner and drummer Jim Marshall, and is now based in Bletchley, Milton Keynes, Buckinghamshire. The design of the JCM800 1986 and JCM800 1992 amps departed from the "classic" Marshall Bass amp design and incorporated a better tone stack with a mid sweep and a slope control not found on the older JMP 1986 and JMP 1992 amps. DOWN you have the Ultra mode. The tone stack is made up of capacitors C 1, C 3, C 8, and C 9, jumper. Schematics. One of the things I wanted was to convert the normal channel into a gainier tone a la Marshall brown sound and be able to jump it with the verb/vibrato channel so I can blend the two. I've used it with pleasing results in 3 amps now. Now whether or not it was designed that way I don't know. The Baxandall tone stack (also known as James) is a classic circuit more commonly found in hi-fi designs. Find shoes, clothing, home decor, handbags & more from designers you love. It doesn’t have quite the bells and whistles as the others on this list, but it’s pretty neat. Contact Me. Let's start with changing a few things in the tone stack (Photo 1), starting with the capacitors. A three-band tone stack (treble, middle and bass) allows you to fine-tune your guitar tone. Most amp mods are about changing the amount of gain and the distortion characteristics, these are for the most part pretty subtle changes compared to changing out the cab, adjustments to the workflow with more options and tone stack adjustments have a greater effect but rarely make the things any better. Marshall BB-2 Bluesbreaker from small metal series. The buyer will also receive the updated schematic for further tweaking if desired. Is there a way I can get a plexi type tone from my Jubilee without amp mods? The Jub and Plexi are two different animals, wasnt sure if by playing with the tone stack, presence and gain knob if I could get in the neighborhood. Mostly the TBM Marshall or Fender type tone stacks have a mid scoop that lends itself very nicely to guitars with magnetic pickups. amp's guitar speakers. It also upgrades the tone stack and adds extra filtering to the high voltage power supply. 047 µF capacitors. That is a very high value for the "mid" (62K)--try reducing that value, that will also reduce some of the bass. Power Supply Stiffening, 5. Peavey Switchable Circuit Mods; Marshall JCM800 2204 Power Amp; Fender Bassman Tone Stack; Hiwatt Fixed-Bias Phase Inverter; Matchless DC-30 Pentode Preamp; Supro Design for 6973 Power Tubes; Hiwatt CP103 Tone Stack; Fender Vibroverb 6G16 Tremolo; Fender Parallel 12AT7 Reverb Driver; Ampeg Design for 7591 Power Tubes; Rickenbacker Grid-Leak Bias. The site is still in beta, some functions might not be fully implemented and a lot of things require polishing, but the basic functionality of creating and sharing Marshall CODE presets works along with the unique web2amp function that allows you to directly load the settings for a selected. Typical mods include master volume, triode modifications, and tone stack mods. While the basic tone stack topology is relatively common throughout the Marshall. I also swapped out the sorry arsed stock speaker with a Celestion Vintage 30 clone. There is a volume increase when the mid pot is turned up. In fact, it is often referred to as the FMV (Fender Marshall Vox) tone stack circuit. Modifications are most common on tube amplifiers. Treble/Bass tone stacks usually have a "tail" resistor that connects the tone stack to ground, like 6K8 for Fender Princeton (in the case of the Twin Reverb, it's a 10K Mid pot), or higher value for Marshall (like 25K Mid pot). 99 Trending at $41. While the Katana-100 includes many advanced features, it’s amazingly simple to operate. This download is the complete documentation of the famous Bill M. Maybe I'll solder it up like this next time I change strings. This bad boy is running on 6v6's with an upgraded output transformer. It's no sweat to break $2,000 on a decent half stack, but many of the brands making top-of-the-line head and cab pairs also make lower-wattage combos that deliver similar tone below $1,000. mods for the Blues Jr. The 20W skip the cathode follower, probably because they don't have an actual tone stack (just a "tone" control which is between the input stage. Sadly, we are seldom offered the opportunity to turn the volume above 3 on a Twin Reverb. 18watt Technical Discussion. There’s a bit more treble and bass on tap, and the midrange control is powerful enough to overdrive some otherwise clean settings when maxed out. Dear Amp Man, I am unable to find anything on cascading the half-unused tube in an AA371 Bassman. "END" places the tonestack after the power amp simulation. It was founded by drum shop owner and drummer Jim Marshall, and is now based in Bletchley, Milton Keynes, Buckinghamshire. Mods Planned: Bias balance mod (allow for mis-matched tubes) External bias points Choke mod Screen resistor - increase to 470 ohm Dual Channel mod - replace Pre and Post Gain with dual concentric pots switched by relays Tonal mods - decrease bass @ first gain stage, increase in tone stack Resonance mod - Add bass boost to presence circuit. Rhoads' family unlocked the vault to Rhoads' amp and allowed Marshall's engineers to diagram the original modified circuitry. Check out what happened to it. I took a look at the 2203 schematic - and the value there (coming off the 12ax7 to ground ahead of the tone stack) is 100k. "SKY" and "SSS" are the same tones as "Modern/Classic" from the original clean pedal. It's designed a lot like the DSL series, and is a 100w tube head that is powered by four EL34 tubes. On the graph below the top line is the Marshall tone stack and the one below is the one from this amp. Baxandall-type tone controls will behave differently as will the simple treble-cut types. Schematics show the use of 270pf treble capacitor in the tone stack rather than the 250pf usually seen, giving slightly more upper mids. Re: HDR/LDR level mod for Marshall Vintage Modern Post by kot » Thu Jan 10, 2019 6:32 pm mickeydg5 wrote: A nice place for adjustment or better yet HDR Volume Control would have been to place a 500kA potentiometer at R15 position. Usually we think of the full Marshall stack, with 50, 100, even 200 watt heads driving multiple 4×12 cabinets. If you don't like it, either adjust or simply bypass it for a more natural amp tone. and made the reverb/trem work on the norm channel. It seems the designers were trying to compensate for the early tone stack placement by adding a final gain stage after a tone recovery stage, but, as you point out, putting the 470k/470pf network (you use 500pf in the MODS schematic) so late in the amp will not really duplicate the raspy sound of the 2204, which puts it after the 1st gain stage. Standby Switch Installation, 2. what dou you think?. The Marshall TSL100 was designated as Marshall's flagship amplifier for some time, and indeed on paper it looks to be a killer amp. Below, we have the Fender and Marshall tone stack frequency response. The stock Tone Stack resistor is 82K. Blackheart BH-15 mods This page covers the mods I’ve made to my Blackheart BH-15 valve amp. The two main tone stacks used by Marshall over the years was first the 56k slope resistor and 250pf capacitor combination – this was used exclusively until 1968 on all their amps. 022uf PI coupling cap switch (the same principle as tone stack switch) - 100pf PI cap instead of 47pf - 0. Bias Control Installation, 7. The gains between the various stage AND the response tweaks therein, modify how the OD sound er, SOUNDS! Cap network then distort? Distort a cap network? Bit of both? Marshalls also have a tone stack stage as a rule consisting of a DC coupled triode section to a cathode follower. AFAIK it's the only amp that inserted the extra gain stages after the tone stack, unlike most Marshall Mods or Marshall based amp designs, again AFAIK. Tolerable for a $49 pedal (or $29 used in my case) but with the plethora of DS-1 mods out there, I thought it could work better for bass. The tone stack was tweaked to be close to the Marshall JCM800 tone stack but without being connected to a cathode follower. 2K 680 to 1k 1. 6k fitted) tone is now much smoother and sweeter whereas before it had a harsh edge to it. My amp tech looked over the Blue Guitar stuff and, after we talked over what I liked about the amp already, he advised me to just go with the input mods and try it out. More on that below. I had a blackface Super recently with too much bass and lower mids I replaced the. 1 provides a simple means of regulating the amount of higher frequencies present in the output signal fed to the loudspeakers. This is a great mod for pretty much any amp with a TMB (treble mid bass) tone stack. Contact Me. The treble bleed ceramic cap was raised from 250pF to 470pF. I find myself using this switch to instantly find a known, standard tone.
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