Marshall Tone Stack Mods

The 5150II is a 5150 with an improved clean channel, and a modified distortion channel. Wired to Marshall 2204 specs, cascade preamp, Marshall tone stack, TMB tone stack, presence, gain, master volume, with one input only. If you are looking for some blazing Marshall tone without resorting to fuzz pedals or using a Hot Plate TM, you are in the right place. Compared to a classic Marshall tone stack, the Vintage/Raw tone stack moves the center of the “Mid” control down in frequency and has more attenuation. 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. The Treble cap is replaced with a high quality Silver Mica cap. To make Marshall/Fender-type tone-stack active one, you feed the output into inverting amplifier(low gain, probably adjustable from 1-10?), and use the output of this amplifier as the ground connection (negative feedback). An SVT tone stack has much more cut and boost capabilities then the Marshall. With easy to follow instructions and all the parts necessary now you can do these mods on your own - Bass to Tremolo, 6L6GC to EL34, Tone Stack and Normal to Bass. Make your combo sound like an old California amp. MOD 101 DIY Guitar Amplifier Kit. i know,once a tone chaser,always a tone chaser. Mods Coupling cap - Mallory's warmer Marshall tone, Orange Drops insert a Vox TB stack for Baby Vox here. The normal channel inputs are no longer connected as it's now a 1 channel amp. Placing HDR volume at the output of the tone stack will preserve all the available gain while adjusting the HDR volume. Preamps, tone stack and Phase Inverter are identically voiced to the Plexi Super Lead. The way a 2203 is laid out, it's not really a true "master volume" amp at all. But there are many players out there who don’t need clean tone and, in their mission of rock’n roll, have modified the Champ with a switch that disengages the tone stack to get a loud and hugely distorted Marshall/Tweed tone. A little more expensive than the other mods I did, but definitely a nice improvement to tone and clarity!. In larger amps with tone stacks, the gain is recovered with an extra tube stage, but not here. Tone stack on this amp really eats gain and volume. Need the money for studio equipment. 68uf over V2a Rk, and the 56k/250pf or 33k/500pf tone stack. I have converted the amp to a Marshall tone stack and other suggestions you’ve made very successfully, but found nothing on tapping into the unused gain stage for the bass side. Very good article about this: Low and Midrange Frequency Response. The treble knob is less of a gain on a fixed frequency than shift between an upper mid and a treble boost. I haven't heard this mod in the flesh but i'm thinking of having it done to mine. i thought this was finally put to rest that there was really nothing that special about Ed's amp,except ED plugged into it. Apparently, they modified the tone stack pretty significantly, and the controls are different. A 250KA (audio or log) pot is wired as a variable resistor in the tone stack ground wire coming out of the Middle tone pot's terminal 1. The 1974 has a distinictive voice of it's own, it doesn't sound like the big Marshalls, so mods and variations quickly became popular. On our first disc, we were a little unhappy with the guitar tones we got, so over the past year we've expanded our amp collection and knowledge. Fender TS gives too much bass. You'll notice the tone stack for Marshall circuits has a "Z source" which is a lot lower than for Fender circuits. It’s an easy-grab, club-sized rendition of the 50-watt 2204 and 100-watt 2203 models that is likely to appeal to many of us who stride the music scene’s lower-volume stages these days. Common Marshall mod to replace the cathode follower with a gain stage and plate feed the tone stack. When flipped all the way down, the Treble knob unactivates the tone stack. Bugera 1960 Amplier Review Demo Fulltone OCD Marshall 1969 Plexi get to anything on the circuit board and Bugera won't give out schematics to mod them. A Blues Junior makes a nice platform for gutting out and building a new circuit inside which is my preferred method of modification. The New 'Low Power Mode' Speaker Attenuator works only on the Internal Speaker and Not on the External 16 Ohm Speaker Socket. exe file and install the software to your PC [approx 1075K bytes]. With the overdrive engaged, the tone stack and the first and second volumes become highly interactive. If you want a Bassman to sound like a Marshall, you can do John McIntyre's Bluesmaker mod which changes gain staging, tone stack, adds a cathode follower, 12AX7 PI and EL34's. In larger amps with tone stacks, the gain is recovered with an extra tube stage, but not here. I used Mallory 150’s and silver mica caps and 1W carbon film resistors. Marshall amplifiers from this period were known for their simplicity in design and awesome tone. This Gibson Goldtone GA-5 might just be the best sounding GA-5 around. i used the EVH value and worked great. 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. Marshall Guv'nor C22 mod - sound comparison posted Actually that cap is after the tone stack in the circuit, so no matter what you do with the tone controls it's. I heard a Rainbow tune the other day on Internet radio, and I just sat there wondering how the heck he could get that fat tone out of a Strat’s bridge pickup. This in effect created a hybrid, valve-state amplifier that delivered traditional Marshall tone in a more robust format. Tone control placement has an effect on the sound of an amp that has lots pre-amp distortion is present. 20 years, a whole bunch of amps, and many years of retail experience later, the 6100 always stayed in my mind as my favourite amp that Marshall ever made. LONDON POWER Kevin O’Connor builds a full line of innovative amplifiers; he also writes the most authoritative books on the subject. The goal is a 2204-esque channel utilizing the unused part of V2 as a Cathode Follower and re-routing the tone stack after it ala Marshall. This Mod is really more of an upgrade. Since 1946, Fender's iconic Stratocasters, Telecasters and Precision & Jazz bass guitars have transformed nearly every music genre. The Marshall JMP50 Model 1987 tone stack lowers the value of R 1 by 41 percent, from 56k to 33k. good power attenuator. Strat + Modded 200-Watt Marshall + Boost = Wood. Haven't done "b" but "a" was pretty successful. that will affect how the signal hits the phase inverter and power amp. Anything above 5's on the treble and bass are going to yield a mid-cut. The way a 2203 is laid out, it's not really a true "master volume" amp at all. The main reason is the trick borrowed from the 6G6-B Bassman of using a preset tone stack internally to shape the typical “scooped” Fender tone. © 2019 Ceriatone Amplification Sdn Bhd ×. 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. The cathode follower is probably the best way IMO to drive a full tone stack, even gain aside. Add $100 to the Mod cost. Marshall amplifiers from this period were known for their simplicity in design and awesome tone. It changes out various Resistors (7) and Capacitors (3) throughout the Tone Stack. This past week, I went a little crazy with it. amp's tube power amp. I used Duncan's Log A for the original tone stack curves, and Log B for my stacks traces, which is near enough, because final evaluation is done with the ears, albeit that the pretty coloured curvy lines do make the initial designing easier. still that nice Marshall crunch and mid range, but much more "omph" to it. To see how. 022uF Mullard signal cap replacing the 0. Then I fixed the tone stack with correct values for a big muff tone stack. Copied from Leo of course!. One thing to note – NONE of these involve modification to the original Marshall circuit. noise performance is better too. Look at the far left of the circuit board. It also upgrades the tone stack and adds extra filtering to the high voltage power supply. Matched with 4x12 cabinets, the 1959 Super Lead helped to popularize the "Marshall stack. I tried this out and it gives a good deal of accent to the sound. Light and portable 100-watt amplifier head with powerful, gig-ready sound; Five unique amp characters: Clean, Crunch, Lead, Brown (derived from the Waza amp), and Acoustic (for acoustic-electric guitars). The normal channel inputs are no longer connected as it's now a 1 channel amp. The tone can be shaped with Bass, Treble and the Contour control. 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. The Fender/Marshall/Vox TMB (Treble Mid Bass) tone stack has been around since the 1950's and has become a staple with Fender and Marshall amps. Amp Guys have a number of 'vintage friendly' mods and overhauls that we can adapt to your stock Marshall, Fender or other style amplifier. It was OK sounding, not great. marshall Class 5, truelya class A amp, with true tube saturation Barely used, This Amp is no longer in production, so this is now a Collector's Item. The Marshall Super PA 50w #1963 and the Marshall Super PA 100w #1968 amps may scare you a bit when you look at them. Also replacing R 5 with 68k (from 470k). This part of the circuit is most commonly a combination of three potentiometers (for bass, mid, and treble knobs), three capacitors, and a resistor called the slope resistor. Stage 5 RS Amp with Ronnie's preferences for vintage Chicago tone: The sound is warm, smooth, fat. Just for fun I put an old Carvin 7 band EQ in front and dialed out the harshness pretty easy. Others may think of a DSL2000 or who knows what else. As we know, the Marshall JCM’s distortion channel is an icon in the rock and roll world. I think I've only seen a couple of this kinda issues in all these years. The Valvestate technique was to put a single 12AX7 valve into the pre-amp section of the amplifier while retaining the solid-state technology in the rest of the amp. after some research and finding Vic Steffens(engineered and mixed. 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. Chane Audio, Westport, ON, serving Ontario's musicians, amp and guitar sales, repairs, mods, new and used guitars, amps, PA gear, open Saturday 9 to 5, by chance or appointment through the week. The New 'Low Power Mode' Speaker Attenuator works only on the Internal Speaker and Not on the External 16 Ohm Speaker Socket. THE 18 WATT COMMUNITY CENTER Thriving online DIY community devoted to the Marshall 18-watt amplifier. Classic 57. 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. Below: 1952 FENDER Champion 600 needed general overhaul and tune up. Since 1946, Fender's iconic Stratocasters, Telecasters and Precision & Jazz bass guitars have transformed nearly every music genre. Also replacing R 5 with 68k (from 470k). Check out the Duncan Tone Stack Calculator and you'll get an idea how it works. pdf - 195 Kb. A 1meg linear pot has been added temporarily to dial out the tone stack. It has the Classic Marshall tone and crunch in a usable 18 watt package. While there’s a lot of saturation available, it’s definitely not a modern sound - or for that matter, a tight Marshall style gain. Let your ears decide. i know,once a tone chaser,always a tone chaser. You'll notice the tone stack for Marshall circuits has a "Z source" which is a lot lower than for Fender circuits. Sven Groth Blackheart tube amp Little Giant 5 watt. Marshall® DSL50 Parts: Marshall® DSL100 Parts : Marshall® Capacitors: Marshall® Corners and Handles: Marshall® Fan s: Marshall® Footswitch Boxes: Marshall® Fuse Holders: Marshall® Hardware: Marshall® Jacks: Marshall® Jack Plate: Marshall® Lights: Marshall® Knobs: Marshall® Pots: Marshall® Potentiometer Kits: Marshall® Power Cords. Peavey Windsor Studio Mods and Problems Tone stack mod I modded the tone stack on mine to resemble marshall's design. So, the end result gives the stock at a somewhat hot rodded JTM45 territory, the Bitmo mid boost adds to the other mods, to bring the tone into the Plexi area. Marshall have stockists all over the world on the internet and in store. Replace the. Standby Switch Installation, 2. Way too much gain, too little decoupling, lousy tone stack. It's not done yet, but here's where it's at: I reconfigured the cathode follower to be another gain stage prior to the tone stack. • The Bright Cut mod takes out a little bit of sparkle in the feedback/clipping section. Internal component view of the hand-wired tone stack of a Kendrick tube amplifier kit. Some also like to use a 250pf cap in the tone stack instead of a 500pf. Loosely based on the JCM 800. Click on the "services" button above for more info. It is included to show the contrast between the tone stacks. One of the many reference points for the tone was my own JTM 45/100® full stack. 10W Chihuahua adds a full tone stack and tube driven spring reverb. 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. Read honest and unbiased product reviews from our users. Make your combo sound like an old California amp. I went with a 100k pot and a 33k resistor on each channel. The choice of the 1959 Bassman was inspired by the book Circuit Analysis of a Legendary Tube Amplifier: The Fender Bassman 5F6-A by Richard Kuehnel. Ok maybe not a Marshall mod but a Hiwatt. Although it sounds not too bad after the mods, it will get less…. 2k cathode resistor (on the first preamp stage and a 100mF cathode bypass cap along with beefing the filter. To me, a JTM45, while a really great amp, isn't the tone I think of when I think "Marshall". Amplifier Repair Serving Minneapolis, St. the 5532 removes almost all the solid-state fuzz from the bass frequencies. 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. 02 cap in the "middle" (actually the bass cap) is usually a. I was going to put in a switch actually to choose between the two, but I didn't like 33k/500pf enough to do it when i tried it on it's own to be honest. Anything above 5's on the treble and bass are going to yield a mid-cut. I recently found a demo with no mod description and it sounded very Marshall Plexi like on the lead 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. The tone he had then were the tones he liked, and there was no need to mod these, to get some other tone. The main reason is the trick borrowed from the 6G6-B Bassman of using a preset tone stack internally to shape the typical "scooped" Fender tone. 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. Check out the Duncan Tone Stack Calculator and you'll get an idea how it works. The Fender tone stack is very scooped. "On the high-gain channel diodes are used for gain/clipping. Modification price: 199,00 €. Find helpful customer reviews and review ratings for Catalinbread Formula 5F6 Tweed Bassman Overdrive Guitar Effects Pedal at Amazon. The bass knob is more of a fixed-freqency gain control. Check the value of R15. I've modded that amp according to the schematics by Lyle Caldwell, changed the tone stack and the input impedance and added a choke. Placing HDR volume at the output of the tone stack will preserve all the available gain while adjusting the HDR volume. You turn up any knob and you really hear the changes in tone. Let your ears decide. (It’s a dead-on reissue Marshall® did with crazy cool custom-made–vintage-recreation speakers and dual transformers to transfer the load of the 4 EL-84s!) The El Rey covers a lot of classic British amp tones by featuring two gain modes with the Power Toggle. The part of an amp’s circuit that governs the ranges of its tone controls is known as the tone stack. Related Links. Browse the back catalogue of Marshall for some of our most popular discontinued guitar and bass amps. Read honest and unbiased product reviews from our users. 18W/28W Classic 57 tweed era amp that uses 6V6s or 5881s. Tone Stack - Replace the awful Bass and Mid caps with high quality WIMA caps. All in one. On our first disc, we were a little unhappy with the guitar tones we got, so over the past year we've expanded our amp collection and knowledge. The Marshall is the Sweetwater version with the speaker upgrade. 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). 5 Watts of Class A power into a six inch speaker, 5Y3 rectifier, a 6V6 power tube and a rare 6SJ7 octal pentode as a preamp tube. I'll show you how to add a Gain Control, a Presence Control, a Midrange Switch, an extra gain stage, and Marshall tone stack all without drilling a single hole or doing anything you can't undo. And it's only a few bucks more expensive than the lower rated models. Here's a controls pre-adjusted MG100DFX curve in blue against a Plexi curve in yellow:. Haven't done "b" but "a" was pretty successful. So hopefully this thinned out but warmed up tye first few stages while shedding some of the high end from the tone stack area. Of course if you love your Blues Junior more power to you. Maybe in time I'll get it installed, when I add a split/shared switch. 6/21/2009. To me, a JTM45, while a really great amp, isn't the tone I think of when I think "Marshall". Well, to the phase inverter, but single-ended amps don't have those so it's moot. There were many amps to choose from in the ‘60s, but the Marshall brand seemed destined to make history early on. If you are looking for some blazing Marshall tone without resorting to fuzz pedals or using a Hot Plate TM, you are in the right place. Vintage Guitar is marking 25 years of publication with a year full of features. This modification is obviously deliberate, and it has substantial effects on bass and low-midrange response. Enjoy lots of harmonics, headroom and tone definition with awesome signal depth and harmonic structure. 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. Haven't done "b" but "a" was pretty successful. On our first disc, we were a little unhappy with the guitar tones we got, so over the past year we've expanded our amp collection and knowledge. If you are looking. 1 (with a 250k pot) and the mids cap being. 1 uf cap put around the "top" of the EQ (from the input of the EQ to the output leaving the 250K Treble control) will do the trick. You'll notice the tone stack for Marshall circuits has a "Z source" which is a lot lower than for Fender circuits. 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. The normal channel inputs are no longer connected as it's now a 1 channel amp. Blackheart BH5H Little Giant 5watt head and 1x12" cab (Bad Transformer. 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. Or try the AC30TB tone stack (Bright on) Wikipedia; Vox forum; TOP BOOST = VOX AC30TBX TOPBOOST. The Contour knob seems to scoop out the mids when turned up high, and maybe boost them a tiny bit when turned down low. From this, the mid knob governs the higher mids and some treble. If you are looking for some blazing Marshall tone without resorting to fuzz pedals or using a Hot Plate TM, you are in the right place. 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. The above is truly the "secret" of great amp tone. If you have a basic understanding of electronics and soldering skills you can do these mods in a couple of hours. Bright switch, bass boost, cold clipper switch, raw tone stack switch, Bassman/2204 Neg Feedback switch. Which ones? New output tubes? Which ones? More gain in the preamp. Guitar Valve Amplifier Mods and Modification - Power Scaling - Effects Pedals, and Carbon Fibre Guitars. Gonna try the James!!!. It's been awhile since I've done any "How To" blogs, so I thought I'd do one where I provide a schematic and layout for a prototype of a two channel, foot switchable hot rod Marshall style amp. Tone Stack - I left the tone stack alone as this is the basic Marshall Tone stack and is a good fit for this amp. The kit uses a 12AX7 preamplifier tube, and a single EL84 output tube with solid state diodes for power rectification. © 2019 Ceriatone Amplification Sdn Bhd ×. ] On a Marshall amp, a. I give you the Super “Stevie Mod” Six! Between the full range controls, the Lovepedal Super Six also acts as a vintage tone stack that is voiced like a blackface-era Fender. Bright and deep bring things to life. Marshall have stockists all over the world on the internet and in store. The way a 2203 is laid out, it's not really a true "master volume" amp at all. Four ECC83s in the preamp section (in concert with the amp's gain/master volume arrangement) give you stunning tone-shaping mojo, and with two 6V6s in…. The power board of these amps looks like the last amps with the Radiospares power transformer, and filtering is kept the same. - It has a 220pF cap across each 470pF treble cap in each tone stack (as with the Plexi Channel mods). Change the voltage divider to a 1 meg and 220K. Post custom amp, guitar and fx mods. So along with any possible tone mods I think going back to a closed cab will help too. He said he removed all of the clipping diodes but had to re balance the pre amp stages and moved the tone stack to the end of the chain like the Marshall. Yep, I had that one prior and it was a tone stack mod done by Rob to sound like both Ride the Lightning and Black Album with a toggle. big hit here, so please no low ballers or trades. This combination creates a dynamic, touch-responsive medium-gain amp that’s perfect for blues and classic rock. To test the mod before taking all of the parts out, you can unsolder one leg of R19. I used Mallory 150's and silver mica caps and 1W carbon film resistors. The amp delivers a thick and juicy sound that overdrives quickly and smoothly (approximately at 3 or 4 on the volume dial like an old Tweed amp). Mastertone Amplifiers is now closed. 5, Bass to 2. I know it´s just one Watt but it is one Marshall Watt of pure sound. The last mod is not for players that like the nice, clean blackface tone. The attached schematic is for a Super Reverb, but the Normal channel was intended more for harp - especially with the "Bright" switch off. Electronic amplification entered the scene in the 1930s —when. I used Mallory 150's and silver mica caps and 1W carbon film resistors. It sounds somewhat "metallic". The amp delivers a thick and juicy sound that overdrives quickly and smoothly (approximately at 3 or 4 on the volume dial like an old Tweed amp). Vintage NOS Mullard “mustard” caps are introduced as part of the mod and the 125uF/16v caps are doubled on the bass channel’s cathode … this way, the amp stays vintage sounding as much as possible … the tone stack is pure JTM45, with one 0. The Output Power of the Amp is Reduced from 5 Watts RMS to 0. Btw, its the mods Zakk used on "No More Tears"(The GOOD Zakk tone )!. Here's how it looks: The tone stack. It also has a different power supply and a few changes in the power section. still that nice Marshall crunch and mid range, but much more "omph" to it. 2k cathode resistor (on the first preamp stage and a 100mF cathode bypass cap along with beefing the filter. Fender Tweed Deluxe (5E3) Low-Pass Mod: Cayocosta. In my book, the Lee Jackson mod wins. Find another one for sale with vintage GEC KT66 power tubes, in great condition, and certificate of authenticity included. I also traded my work (populating an amp pcb) for a Killer Ant. Decided to modify the tone stack and use better components for increased articulation. 2k cathode resistor (on the first preamp stage and a 100mF cathode bypass cap along with beefing the filter. 120k works pretty well for replacing a 1M bass pot in a Marshall tone stack to simulate that pot at noon. Record with stereo mod, EQ, delay, and reverb effects in a DAW via USB Custom Waza 12-inch speaker realizes classic British stack. Add a 5uF cap across the second stage 10K resistor. The CeriaTone and name, logo and related trademarks and service marks, owned by CeriaTone. Learn to mod your amps and you'll be able to dial in what. Most amps have one or the other but not both. WOW!you guys seem to know your stuff. The mids are quite pronounced as well. Reviewed by Guitarist magazine in the UK and given the line, "Shredders, here is an amp you won't need to have modified," this move by Marshall was again an outgrowth of musicians' desires, featuring more distortion than ever and retaining popular aspects of the late JCM800 models. The earliest non-master volume Marshall models can even provide additional fattening of the low-end frequencies by way of the tube compression as well as through mild speaker distortion. 1968 Marshall Plexi 50 Watt Schematic >>>CLICK HERE<<< I modefied Super Bass(1983y), refer to 2203 Super lead's schematic. My Marshall Jaguar 20 watt head originally had only a tone and a volume control. It could be w/ a push/pull pot, standard toggle, or be foot switchable. The normal channel inputs are no longer connected as it's now a 1 channel amp. For those who are looking to purchase a high-quality Marshall amp—without breaking the bank—the 15-watt combo amp is the best Marshall amp to consider. ‘67 Plexiglas Variac—1967 Marshall Super Lead Plexi head (with Variac mod) Pete Townsend, Eric Clapton, Angus Young, Eddie Van Halen "Brown" tone. Guitar Valve Amplifier Mods and Modification - Power Scaling - Effects Pedals, and Carbon Fibre Guitars. 680pF) are different from the Red channel. It’s a fact that Mesa Engineering uses two modified forms of the Marshall tone stack for their Dual Rectifier series. If you are looking for more of a Fender Tone stack, you can play with the R and C values, but you will have trouble changing the potentiometer values since they are soldered directly to the Printed Circuit Board (PCB). Great highs and slightly reduced bass. The preamp is currently fairly awful. 120k works pretty well for replacing a 1M bass pot in a Marshall tone stack to simulate that pot at noon. You'll notice the tone stack for Marshall circuits has a "Z source" which is a lot lower than for Fender circuits. Too much gain and it doesn´t sound pretty anymore. The main reason is the trick borrowed from the 6G6-B Bassman of using a preset tone stack internally to shape the typical "scooped" Fender tone. Common Marshall mod to replace the cathode follower with a gain stage and plate feed the tone stack. 2000+ profiles that cover American Blackface and Tweed cleans, British Top Boost, Normal EF86 style chime, Plexiglass grind and tons of boutique edge of break up tones. To make Marshall/Fender-type tone-stack active one, you feed the output into inverting amplifier(low gain, probably adjustable from 1-10?), and use the output of this amplifier as the ground connection (negative feedback). Those looking for the true Marshall sound only need use an original, unmodified Super. With the lower mids on a “Deep” knob, the tone controls are very nice and should be enough to please any tweaker. 1 Watt Carbon Film resistors are used. Find helpful customer reviews and review ratings for Catalinbread Formula 5F6 Tweed Bassman Overdrive Guitar Effects Pedal at Amazon. 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. I decided to try it but with a mini toggle so I could check the differences. I have converted the amp to a Marshall tone stack and other suggestions you've made very successfully, but found nothing on tapping into the unused gain stage for the bass side. The classic Marshall Tone stack tends to emphasize the upper mids, which in turn tends to drive into distortion sooner in that layer. amp's tube power amp. But there are many players out there who don't need clean tone and, in their mission of rock'n roll, have modified the Champ with a switch that disengages the tone stack to get a loud and hugely distorted Marshall/Tweed tone. I was going to put in a switch actually to choose between the two, but I didn't like 33k/500pf enough to do it when i tried it on it's own to be honest. I will provide a schematic showing all the mods to the original circuitry. 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. It’s an easy-grab, club-sized rendition of the 50-watt 2204 and 100-watt 2203 models that is likely to appeal to many of us who stride the music scene’s lower-volume stages these days. And I know that there's a percentage of folks who replace the caps in the stock stack with a 500pF/. The preamp is currently fairly awful. This download is the complete documentation of the famous Bill M. 2k cathode resistor (on the first preamp stage and a 100mF cathode bypass cap along with beefing the filter. Compared to a classic Marshall tone stack, the Vintage/Raw tone stack moves the center of the “Mid” control down in frequency and has more attenuation. Reviewed by Guitarist magazine in the UK and given the line, "Shredders, here is an amp you won't need to have modified," this move by Marshall was again an outgrowth of musicians' desires, featuring more distortion than ever and retaining popular aspects of the late JCM800 models. compresion mod - 2 x 220k resistors(r72 and r75) need to change for standard 100k marshall value, you can go further and also change r71 from 150k to 100k OD2 to OD1 if you want the classic marshall tone stack, i recomend this one if you are going to use g12t75 negative feedback mod. I also traded my work (populating an amp pcb) for a Killer Ant. Jim Marshall created amp tones that are still some of the most desired sounds to this very day. And it looks absolutely stock, except you have to use the Bass channel inputs. 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. The 80's were a time when many musicians opted for the hot-rodded Marshall sound (a. Add $100 to the Mod cost. Marshall The Custom channel is a Bassman tone stack so it's got. This mod works better with the PPI2 Master Volume Mod installed so you can control the volumes better and maximize gain potential. What a tone he had that very day. 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). It is included to show the contrast between the tone stacks. Another advantage of placing the HDR volume at the output of the tone stack is that the HDR gain will not depend on the level of HDR volume, i. 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. Ken Fischer and Gerald Weber talk about the tone stack on the Bassman, and how it deviates from the schematic in practice. noise performance is better too. I think part of the Marshall mojo is the cathode follower into tone stack into phase inverter. The normal channel looks and sounds like the normal channel on other blackface amps (relatively speaking). This is the standard Fender/Matamp/Marshall (Most others) tone stack. Read more: Marshall Studio Classic Combo. Which ones? New output tubes? Which ones? More gain in the preamp. The Marshall MG series is one of the most coveted amp series for its reliability, tone quality, and performance. This combination creates a dynamic, touch-responsive medium-gain amp that’s perfect for blues and classic rock. The Centurion is fitted with a 15. There is an 18 watt "lite" circuit that has tremolo with only one input and sole tone control. Marshall The Custom channel is a Bassman tone stack so it's got. Second, except for a few component values, the tone stack already is a Marshall (actually 59 Bassman which is what Marshall copied) type tone stack. The Traynor only have a single tone control. The further away from ground you lift the tone stack, the more mids, but the less effective the controls are. Not wanting to do anything radical in the tone section, I chose to use a Fender/Marshall/Vox tone stack. Change the pots to mil spec as the replacements have a life of about 5 years. 68uf over V2a Rk, and the 56k/250pf or 33k/500pf tone stack. We added a tone stack that you can switch out and a mid. So just plug in, hook up your big speaker stack, and start another rock revolution with the Marshall 1959HW tube guitar amplifier head! Marshall 1959HW Tube Guitar Amplifier Head at a Glance: A handwired Marshall legend. Check out the Duncan Tone Stack Calculator and you'll get an idea how it works.