Instructions to perform the mods are included. the Dallas Rangemaster (what the Beano Boost is a clone of), was used with Marshall’s to get those iconic vintage Marshall tones we. x will be o. LONDON POWER Kevin O’Connor builds a full line of innovative amplifiers; he also writes the most authoritative books on the subject. Horseheads, NY 14845 "Established 1998" Voodoo Amps® has provided Pro Tone to the biggest names in the music business since 1998. The mods shown on the internet are for guitar and, maybe more specifically, rock guitar. I got the urge to put the old caps back in since I had the amp open and the tone became quite a bit brighter and harsher. Gerald Weber also says he's seen a lot of amps this way, but he personally prefers the. Les Paul Lover Duke of Orange Posts: 6774 Joined: Tue Aug 18, 2009 9:08 am Location: Derby, England. 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. It doesn’t look like a Marshall tone stack. The Speaker is the Same - Marshall/Celestion 'G10F-15'. A standard Fender tone stack uses 0. 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. I have built several amps from kits and from scratch. Each cab contains a 10″ Celestion speaker. What we have in the schematic is a preamp section with a footswitchable/manual switchable gain stage. The listing includes Vai’s 100-watt, four-input Marshall JMP Plexi head and matching "white face" 4×12 cabinets. Now it sounds better than not having anything, or than having a 2n5457 in Q4. Steps 1, 2, and 3 raise the preamp stage gain and apply a Marshall-style voicing to the preamp. It's subject to change but I think this will be the general idea. The further away from ground you lift the tone stack, the more mids, but the less effective the controls are. There are reports of Tufnel using a prototype amp capo too, but these have never been confirmed. 022uf PI coupling cap switch (the same principle as tone stack switch) - 100pf PI cap instead of 47pf - 0. So I took this one in a more Marshall Plexi direction. Second, the conventional TMB tone stack used by Fender and Marshall (and many other amps) are highly interactive. Btw, its the mods Zakk used on "No More Tears"(The GOOD Zakk tone )!. The previous tone stack was a little limited, so it was tuned up to have more range and provide a realistic, interactive response. Horseheads, NY 14845 "Established 1998" Voodoo Amps® has provided Pro Tone to the biggest names in the music business since 1998. Essentially, the Dirty Little Secret was designed to accurately reproduce the same characteristics of the passive tone stacks found in Super Lead and Super Bass amps. I just used a standard Marshall tone stack whereas the JMP-1 uses a standard Marshall tone stack but the pots are replaced with fixed resistors but those values don't necessarily correspond to the pots at noon. I can assure you that an EL-34 powered, plexi-modded bassman head through the right speakers can do a very convincing Marshall impersonation. 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. Tone stack mod I modded the tone stack on mine to resemble marshall's design. Official Tone Junkie Store 57 5e3 Deluxe! Seeking to capture the iconic tone of an original 1957 Fender 5e3 Tweed Deluxe amplifier, the 57 5e3 Deluxe Kemper Profile Pack beautifully captures this late 50’s tweed circuit that can reach from beautiful Fender cleans to “the best kept secret in rock music”. This mod works better with the PPI2 Master Volume Mod installed so you can control the volumes better and maximize gain potential. As with the Combo it is an All Valve, Class A, Cathode Bias, Single Ended Design with NO Transistors, Chips, Digital Processing or SMT (Surface Mount Technology). Magazine Reviews. The 'No Feedback' position makes the amp break up early kind of like a 5E3 Deluxe. By nature, the DS-1 is fizzy and inarticulate, making the tone stack unusable in most live situations with its stock scooped midrange. to get the tone to match. Re: Marshall Class 5 Combo 2010-2012 RIP There was another Class 5 thread awhile back that I contributed to and theres lotsa info in that thread. 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. Most pedal tone stacks use a single-band pass filter to either cut the highs or the lows from the signal. amp's tube power amp. The collection of schematics and mods you'll find below contain the most popular and best mods for improving the tone and extending the tube life of a Valve Jr amp. 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. 6K to 10K C1. Here are some examples of settings by matching the EQ according to it's approximate equal shape, or a shape that will get a person to similar sound. Please practice hand-washing and social distancing, and check out our resources for adapting to these times. What it does have is every combination of 100 watt JMP variation from the Plexi to the mid seventies Super Lead and Super Bass heads. The Mod: This mod primarily involves reworking the tone stack and changing a few bypass capacitors. 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. 36watt TMB () () - Older original 36watt TMB r5 () () - Richie's latest design 18watt TRex - This is Lite II plus an overdrive TMB channel. The app has basically the same features as Duncan's TSC: you can fully edit the component values on a schematic-like layout, move sliders to simulate tone and/or volume knobs, load/save circuits, and export the chart and schematic as images or. DIY: Hot-Rodding The New Fender Champion 600! by John R. More preamp gain by bypassing the tone stack / EQ circuit. 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. i found that the first one sounded Fenderish an the second almost like a real Marshall. Marshall TSL FX Loop Mod We modify DSL amps all the time, moving the effects loop to before the master volumes, for better results with line level outboard gear. • The Hard Clipping mod is taken from the King of Tone and allows you to add hard clipping after the standard diode clipping section. There aren't enough preamp valves to implement two PPIMV circuits, you would need six - plus dual-gang pots to make two separate tone stacks. It's a fact that Mesa Engineering uses two modified forms of the Marshall tone stack for their Dual Rectifier series. the Dallas Rangemaster (what the Beano Boost is a clone of), was used with Marshall’s to get those iconic vintage Marshall tones we. If we had infinite supply voltage and valves that didn't arc then the original cascaded gain to the start of the tone stack was around a factor of 12. This amp is the solution for minimalists who desire the classic Marshall vintage tone without the price and inflexibility of owning a loud and heavy Marshall Plexi half stack. Twin Stack Mod, 6. Here’s a link to an excerpt from the RCA Receiving Tube Manual. The JTM-1H employs two 12AX7 and one 12AU7 tubes in a Class A/B configuration, and Marshall says that the amp is "based on the JTM45 tone stack, as if the inputs had been jumped," which sounds about right, though with more gain on tap as mentioned previously. 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. Those looking for the true Marshall sound only need use an original, unmodified Super. Our clean tones are rich, thick, and juicy. Changes the caps in the tone stack to the original values and reconfigures the Mid pot wiring. Epiphone Valve Jr. About the different models: The Peavey 5150 should need no introduction. 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. On amps that do analog modeling, the tone stack is one of the sections of the amp they switch out. that will affect how the signal hits the phase inverter and power amp. Closed back cab suggested for the tightest tone. Fender Champion 600 / Gretch 5222. Marshall Bass 200W 3520 Schematic. back to TubeAmps2. Also popular is the conversion of the tone stack to the “Twin Tone Stack”. Rhoads' family unlocked the vault to Rhoads' amp and allowed Marshall's engineers to diagram the original modified circuitry. 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. I began this as a response to a forum question and as I got going, decided I would do an all out review/guide to the amp since it was so long. ) 33k/500pF tone stack combo instead of a 33k/556pF tone stack combo 3. Although it sounds not too bad after the mods, it will get less…. 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. Marshall’s generally do not feature great lush sounding MOD spring reverb. A standout feature of the Katana-Artist is its custom Waza 12-inch speaker, which produces tones inspired by the benchmark 25-watt British stack speaker from the 1960s. 022uF Mullard signal cap replacing the 0. There aren't enough preamp valves to implement two PPIMV circuits, you would need six - plus dual-gang pots to make two separate tone stacks. Typically, the ‘Treble Cut’ control is a 500K/1Meg potentiometer, with a. With this mod, these amps hang in there with modern German and American amps, without loosing its marshall pedigree. You provide the tools and solder. Being a tinkerer, I then put in some better tubes and a Celestion Blue speaker. amp's tube power amp. 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. x beta because it’s just too buggy and slow compared to 3. 14-Watt Guitar Amplifier with Baxandall Tone Stack Kit (#5887) This kit is a very clean-sounding 14-watt Guitar Amplifier. The Treble cap is replaced with a high quality Silver Mica cap. Choose your tone. Analogman King of Tone: Another overdrive based on the Marshall Bluesbreaker that is coveted by guitarists and has about a year waiting list just to get one. 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. The bridged-T notch filter has been used in music and audio designs. 022, and the. It had a bit of a raspy low end. The Jubilee also featured a "semi-split channel" design, in which two different input gain levels could be set, running through the same tone stack and master volume control. This is the standard Fender/Vox/Marshall tone stack. Horseheads, NY 14845 "Established 1998" Voodoo Amps® has provided Pro Tone to the biggest names in the music business since 1998. 022uf caps in the tone stack instead of the stock. That explains why I like the "Visual Sound Jekyll & Hyde" (Jekyll side is basically Marshall Shredmaster) to be set to "sharp" instead of "blunt". For this to work, you must be using 56k/250pf as the tone stack on the board, and use 82k and 250pf for the parts mounted on the switch. Big Muff Tone Control Circuit 'Fake' Variable Capacitors Marshall Gov'nor Tone Stack Mid Scoop Tone Control 2x Pot Tone. The earliest JTM45's, i. Being a tinkerer, I then put in some better tubes and a Celestion Blue speaker. Posted by 5 months ago. Followers 0. It depends on how the master volume is implemented. The Ultra mode has an even fatter, more robust tone. I'm probably going to turn that cold clipper preamp stage into a cathode follower and the tone stack into a James with mid shift. Remove these and install two 0. Marshall Bass20 20W 5502 Schematic. Here are the values I used: C6 Silver Mica 250pF/500V C9 Mallory 150’s 100nf/600V C10 Mallory 150’s 47nf/600V. You may want to change the slope resistor to 56k and remove the. I began this as a response to a forum question and as I got going, decided I would do an all out review/guide to the amp since it was so long. 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. The bass is tighter, the cleans are warmer, the lead channels are more focused and tight, the crunch channel is less floppy, the gain is quieter and the thing sustains forever in any channel. 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. Pre-slice and dice: Extra vol control installed after tone stack. Just like. 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 used this tone stack calculator to help me decide on the final values. - 56k/250pf - 47k/340pf - 33k/500pf tone stack switch (SDM's site) - 0. Tone Stack Mod, 3. Apparently, they modified the tone stack pretty significantly, and the controls are different. Achieve the sound and tone you're searching for with Fender's redesigned Mustang Amp and the new Fender Tone app. The mods sound great. 18uf preamp coupling caps - higher value capacitors for mains, screen, PI, preamp filtering - lower value capacitor for the V1 bypass cap. 680pF) are different from the Red channel. Actually that cap is after the tone stack in the circuit, so no matter what you do with the tone controls it's still dumping a bunch of treble to ground. For this reason, Twin Reverb, Blues Deville, Marshall JCM800 and other high wattage amps are too much for a lot of modern recording situations. 02 cap in the "middle" (actually the bass cap) is usually a. Click to open in a new window. 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. amp's guitar speakers. - Custom Builds. My version has a lower voltage and sounds darker but I do have an old 275v transformer so I must try it. I can assure you that an EL-34 powered, plexi-modded bassman head through the right speakers can do a very convincing Marshall impersonation. 00 H H Input 0 1 2 3 4 5 6 7 8 9 10 Gain 0 1 2 3 4 5 6 7 8 9 10. Marshall Class 5 Combo - Made in the UK - I am no longer modifying these Amps - The Following is for Information Only. • The Bright Cut mod takes out a little bit of sparkle in the feedback/clipping section. - Modified Tone Stack - Allows each Frequency (Treble, Middle and Bass) to sweep from 'Zero-to-Max'. Please practice hand-washing and social distancing, and check out our resources for adapting to these times. A relatively hard to find 30 watt combo and rarely discussed. Modern Rock/Metal I offer a Modern Rock/Metal for Haze to give it even more gain a a modern rock/metal type tone and tight bottom. 77909 What would you guys do to revoice the bass side of this bassman? I do not play bass, so it would be cool to have marshall tone on one side, with fender on the other. No, not quite - it's very close to the Orange channel but the slope resistor is different (33K vs. An SVT tone stack has much more cut and boost capabilities then the Marshall. The traditional arrangement suffers from the problem that on start up, the grid will immediately rise to HT potential while the cathode is still cold, at ground potential. Marshall BB-2 Bluesbreaker from small metal series. Check it out. Like the AB763 circuit. Tags: marshall; steve vai. Made in china around early 00’s. The new caps have corrected values to open up the tone and get rid of that boxy sound. All kits come with easy to follow instructions and use point to point wiring. Perhaps some of you know a mod that could keep the basic Traynor circuit, but mod it for a Marshall 18/20 watt-like tone? Let me know what you all think. MOD 101 DIY Guitar Amplifier Kit. Modifying the tone stack. A three-way tone stack and built in reverb, chorus, flanger, phaser and delay add to the versatility while you also get a couple of ins and outs (line in for CD/MP3 jam-along and a line out/headphone with speaker emulation). 022, and the. To make this model feel more like a full amp, the power amp from the Fatality model (mesa rectifier mod) was added then tweaked slightly to reinforce the overall EQ curve of the Big Bottom. The Official Blackstar Amplification site, featuring Guitar Amplifiers, Guitar Amps, Effects Pedals, Merchandise, Dealers, Videos, Artist News. There's still plenty of adjustment in the tone controls. Schematics show the use of 270pf treble capacitor in the tone stack rather than the 250pf usually seen, giving slightly more upper mids. There are many mods you can find for this and here are some of my favourite. Marshall Jimi Hendrix Super100JH Background Info: This amp is a re-creation of one of Jimi Hendrix's surviving personal amps, serial number 7029. 2) Change R8 to 220K/1W. 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. Blue Moon Lite Schematic July 10. The app has basically the same features as Duncan's TSC: you can fully edit the component values on a schematic-like layout, move sliders to simulate tone and/or volume knobs, load/save circuits, and export the chart and schematic as images or. The three knob tone stack has been around since the beginning of bass amplifiers. I'm probably going to turn that cold clipper preamp stage into a cathode follower and the tone stack into a James with mid shift. The goal was to achieve the wide-open Marshall sound. These heads don't have a very good reputation, so can be bought for relative little money. Old nasty. that will affect how the signal hits the phase inverter and power amp. Marshall 9100 2X50W Schematic. Fender Champion 600 / Gretch 5222. 1uF tone stack mods. Compared to a classic Marshall tone stack, the Vintage/Raw tone stack moves the center of the "Mid" control down in frequency…. Marshall 2061x, does plexi at sane volume. User Controls. Fender, Marshall, and Traynor Tone Stacks I’ve recently begun recording a second disc with the band I’m in, Shayna and the Bulldog. Like the later Bass and PA amps, the early amps (## 2-6) all have a warm tone with plenty of bass. This mod works better with the PPI2 Master Volume Mod installed so you can control the volumes better and maximize gain potential. To make this model feel more like a full amp, the power amp from the Fatality model (mesa rectifier mod) was added then tweaked slightly to reinforce the overall EQ curve of the Big Bottom. Leaving every knob in the middle position rarely yields a “neutral” frequency response, and changing the value of one component will usually alter the response of more than one frequency band. Switchable Tone Stack February 27, 2010 admin Mods 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. 2k cathode resistor (on the first preamp stage and a 100mF cathode bypass cap along with beefing the filter. Internal component view of the hand-wired tone stack of a Kendrick tube amplifier kit. It's a purist tone: bridge pickup for rhythm distortion, neck pickup for the solo and a dash of warm room reverb. Made in china around early 00’s. The DLS absolutely bests Bias' internal preamp sim for warmth and dynamics. 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 channel controls: bass, treble and volume Vintage. Uses four KT-66 output tubes. 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. Supplied with two 1 x 10 inch speaker cabinets its looks and sounds great. Blue Moon Lite Schematic July 10. I've left the normal channel mostly stock and really want more gain on the modded side. It will accept your guitar input via a 1/4" phono jack. Re: Favorite mods to the Fender Normal channel??? « Reply #22 on: April 04, 2010, 03:02:39 am » Since there is no mid control I would take out one of the inputs and add a 25KL pot instead of the 6. Here's a link (there are others if you search under "AC15 bright cap mod:" Vox AC15 Mod Guide | END OF THE GAME The two modifications above made the amp really nice. 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. So I took this one in a more Marshall Plexi direction. When James Marshall Hendrix landed in England, he thought it was fate having the same name as Marshall's owner, and left the store with a brand new 100. 02 cap in the "middle" (actually the bass cap) is usually a. Make your combo sound like an old California amp. The mod is recommended for those who play at home or for recording. ; TRex MOSFET Switch - specific implementation. This interconnectivity is key; operating one control may influence the behavior of the others. Here's a French article I found a while back. So then you could use V2A as another gain stage, or a parallel output stage. Being musicians ourselves, we have the unique opportunity to channel our love for music and passion for performance into our chosen craft: amplifier design. The earliest JTM45's, i. An SVT tone stack has much more cut and boost capabilities then the Marshall. The speaker in the pics is an old, tired, fender speaker - doesn't sound good in this amp. A typical plexi circuit looks a lot more like a vox circuit (top boost). 2 250pF caps in parallel effectively make a 500pF cap. 2) Change R8 to 220K/1W. Like the later Bass and PA amps, the early amps (## 2-6) all have a warm tone with plenty of bass. All in one. On the Marshall 1959 Super Lead schematic, the signal leaves the tone stack and enters the phase inverter at point A. Ken Fischer and Gerald Weber talk about the tone stack on the Bassman, and how it deviates from the schematic in practice. I wanted to be able to take the sound of this stack with me to gigs easily, but not risk harming the amp. 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. Marshall 9100 2X50W Schematic. Dear Amp Man, I am unable to find anything on cascading the half-unused tube in an AA371 Bassman. However, Keeley does include a manual for his 5 start tone stack which what he calls his mod to this pedal. Marshall Bass 100W 3510 Schematic. There is an 18 watt "lite" circuit that has tremolo with only one input and sole tone control. On amps that do analog modeling, the tone stack is one of the sections of the amp they switch out. ) 33k/500pF tone stack combo instead of a 33k/556pF tone stack combo 3. Below, we have the Fender and Marshall tone stack frequency response. Note that this mod package is for the C1 model of AC4. I have built several amps from kits and from scratch. The Germanium Super Phat Mod – Hand Built Edition not only has the perfect JFETS for tone, it has the attention to detail only a hand built product can provide. good power attenuator. If you look in Mullard's circuit book, you will find two versions of the 5-10 amp. 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. 5K R10 220 1K 3 Watt 1K 3 Watt R14 220 240 -270 1watt 240-270 1watt R15 1. The preamp is currently fairly awful. There is a volume increase when the mid pot is turned up. Mesa Boogie 3-channel. The output impedance of a cathode follower is lower,and you get better bass response. Modern Rock/Metal I offer a Modern Rock/Metal for Haze to give it even more gain a a modern rock/metal type tone and tight bottom. Not sure why Marshall doesn't stray from convention and make a 1974x with a tone stack. 02 cap in the "middle" (actually the bass cap) is usually a. Using the tube from the Bass Instrument channel, the circuit is modified into the classic tube tremolo circuit. The "Tweed Mod" leaves out the key to the Fender tweed sound-the tone stack driven by a cathode follower. The Marshall DSL15C-KIT-1 1×12 Guitar Amp Combo Kit is much more than a kit to help you build your own guitar amp if you're an amateur. This mod will improve your Marshall's Clean tone. If you want a plexi tone then youd want a different gain structure and a more sophisticated tone stack (known as a FMV or fender marshall vox). Overall, the amp is extremely responsive. Tone Stack mod-- Just slightly more difficult than the prior mod, this one involves replacing two caps in the tone stack with ones of different ratings. The collection of schematics and mods you'll find below contain the most popular and best mods for improving the tone and extending the tube life of a Valve Jr amp. Switchable Tone Stack February 27, 2010 admin Mods 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. Angus’s tone, to me, has that classic plexi sound to it — so it only makes sense to use a plexi mimicking pedal. Typically, the ‘Treble Cut’ control is a 500K/1Meg potentiometer, with a. This comes before the tone stack and provides a different effect than just turning down the tone control. Choose your tone. I bought my Champion 600 in 2008 (about). The cathode follower is probably the best way IMO to drive a full tone stack, even gain aside. Standby Switch Installation, 2. Note that this mod package is for the C1 model of AC4. Treble MEANS treble and bass means BASS. More on that below. Unnervingly, if you see it enough it even begins to make sense. Modern Rock/Metal I offer a Modern Rock/Metal for Haze to give it even more gain a a modern rock/metal type tone and tight bottom. Let's start with the preamp. Please login or register. Since tube guitar amplifiers are the easiest thing in the world to 'play with', many 'gurus' have come out of the woodwork. Marshall Mods by Voodoo Amps. Marshall JTM45 The Marshall JTM45 Reissue is a great sounding amp. Compare that to a Blackface Fender preamp: This is an AA165 Blackface Bassman and technically it uses 2 and a half tubes for the preamp, but if we were to make this a one-channel jobber we'd only need one and a half preamp tubes. Overall weight of assembled amp kit is 23. All kits come with easy to follow instructions and use point to point wiring. They’re the Filet Mignon of the amp world. On amps that do analog modeling, the tone stack is one of the sections of the amp they switch out. The speaker in the pics is an old, tired, fender speaker - doesn't sound good in this amp. The second diagram shows the other way you can switch between two tone stacks, by adding components in parallel with the tone stack on the board. Switchable Tone Stack February 27, 2010 admin Mods 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. I added a regular tone stack. 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. This modification is obviously deliberate, and it has substantial effects on bass and low-midrange response. Looks like it has only 2 inputs. The added tone stack will cut volume coming from the single gain stage that makes the Natural channel. THE 18 WATT COMMUNITY CENTER Thriving online DIY community devoted to the Marshall 18-watt amplifier. It's capable of tone from clean jazz, crunchy blues, to raunchy classic rock. the offset's, were, essentially, a Bassman clone. Blue Moon Lite Schematic July 10. In general, the modifications I describe in How to Hot Rod Your Fender Amp can be adapted to other major brands of tube amps besides Fender, such as Marshall, Gibson, Vox, Ampeg, and Peavey. 18watt Technical Discussion. Gerald Weber also says he's seen a lot of amps this way, but he personally prefers the.   This gives you the ability to remove the mids all together in the first part of the pot rotation then bring them in as you turn it up, nice touch. It had a bit of a raspy low end. October, 2012. The DLS absolutely bests Bias' internal preamp sim for warmth and dynamics. 022uF Mullard signal cap replacing the 0. In my own Twin I've used a 47pF bright cap,a 2. Basically, you're dealing with a real Marshall tone stack, and thus, you'd use the controls on the DLS as you would on an actual Marshall amp. 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 A ton of tube tone Two bridgeable channels. Each one has. The 5W Epiphone Valve Junior has certainly created a stir among devotees of tube-based guitar amplifiers. amp's guitar speakers. As with the Combo it is an All Valve, Class A, Cathode Bias, Single Ended Design with NO Transistors, Chips, Digital Processing or SMT (Surface Mount Technology). The next consideration is the tone stack. 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. Now the early JTM 45's had the same tone stack as the coveted Fender Bassman so in essence didn't break up as early in the mid range, consequently we. After experimenting with lap steel with Alumitone pickup, I narrowed it to: 1M volume pots C5= 250pF SM C6=. 022uF Mullard signal cap replacing the 0. Unnervingly, if you see it enough it even begins to make sense. Here is another video of my little Marshall Plexi amp built with 6F4P power tubes. the Dallas Rangemaster (what the Beano Boost is a clone of), was used with Marshall’s to get those iconic vintage Marshall tones we. At the least, replace the. The Treble cap is replaced with a high quality Silver Mica cap. With P90s and humbuckers I liked the engaging the tone control for cutting some low frequencies and dialing in some sizzle. My version has a lower voltage and sounds darker but I do have an old 275v transformer so I must try it. While the basic tone stack topology is relatively common throughout the Marshall. Well done Dr. But things in the world of guitar amplifiers are often not as they seem. Rhoads' family unlocked the vault to Rhoads' amp and allowed Marshall's engineers to diagram the original modified circuitry. The tone stack was already there, just non-adjustable. Please login or register. 6/21/2009. The ideas and theory at work here can easily be tweaked, modded, and applied to the modding of most any Single Ended tube amp similar to the VJr, such as the venerable Fender Champ. 022, and the. I got the urge to put the old caps back in since I had the amp open and the tone became quite a bit brighter and harsher. Posted by 5 months ago. Marshall Class 5 Head C5H - Made in the UK - I am no longer modifying these Amps - The Following is for Information Only. Friedman BE-100 "Marsha" 12. A 1meg linear pot has been added temporarily to dial out the tone stack. This is what I consider somewhat of a guide to the Marshall Class 5. 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. No, not quite - it's very close to the Orange channel but the slope resistor is different (33K vs. 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. The tone stacks are just a Baxandall in the Prowler w/notch filter that acts as a mid-boost in an active circuit (I do similar in my guitar amps), while the ValveKing is just a standard issue Marshall or Fender stack. I first did this to compensate for the JVM having lower value treble and mid pots than a traditional Marshall, which shaves off a little more upper mids and I thought it was a little known way of addressing this (Santiago, have you been. 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. To further enhance the lifetime of the ECC82 driver stage tube, the stock 39kOhm anode resistors were raised to 47kOhm and up to 56kOhm in the second series. Btw, its the mods Zakk used on "No More Tears"(The GOOD Zakk tone )!. Components: Values can be altered simply by double-clicking on the component. I'm still waiting for the new speaker, should be here Wednesday. 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). The tone stack has an extended range. 00 H H Input 0 1 2 3 4 5 6 7 8 9 10 Gain 0 1 2 3 4 5 6 7 8 9 10. 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!. 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. Marshall Mods by Voodoo Amps. 2k cathode resistor (on the first preamp stage and a 100mF cathode bypass cap along with beefing the filter. 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. Brit / USA / Pure Switch for the Tone Stack (delivering a Mid Boost and Overall Gain Boost when in Pure mode) Lodaed with Hand Selected USA 12AX7 (x2), USA Matched 6V6 (x2), and 12AU7 (x1) tubes Versatile Speaker Outputs allow Dark Horse Head to drive 8 / 16 ohm cabinets Carry Bag Included 1 x 8-ohm or 2 x 16-ohm Cabinet Configurations. Jun 26, 2017 - Fender/Marshall/Vox Treble/Mid/Bass tone stack by RobRobinette. If you do not see your amp listed please contact us!". 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. Kind of sounds like greek to me but your schematics and picture look great. mods for the Blues Jr. The mids are quite pronounced as well. I’ve been eternally impressed ever since. The Jubilee also featured a "semi-split channel" design, in which two different input gain levels could be set, running through the same tone stack and master volume control. 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. I'll show you how to add a Gain Control, a. This download is the complete documentation of the famous Bill M. NOE parts main switch and indicator. I have looked through tons of forums concerning this, however most focus on the ab165 circuit. Convert your Epiphone Valve Jr. The legendary tone of Peavey amplifiers in a small, portable package! Our most rugged, lightweight powered audio mixers ever! The Most Advanced Modeling Amp On The Planet! The undisputed go-to guitar amplifier. Here's a link (there are others if you search under "AC15 bright cap mod:" Vox AC15 Mod Guide | END OF THE GAME The two modifications above made the amp really nice. This is perfect for beefing up a Strat or pushing an amp hard so that you get more natural tube amp distortion. Except with more gain than is available from a stock vintage Marshall. The tone stack has a very wide range and we have found it works great with all types of pickups including active. I began this as a response to a forum question and as I got going, decided I would do an all out review/guide to the amp since it was so long. It's tone stack, tube configuration, preamp and power section has inspired numerous amps builders including Jim Marshall, the founder of Marshall amps, who used the Bassman tweed 5F6-A circuit in 1958-1959 as template the legendary Marshall JTM45. I will build to spec from kits or from scratch. Simpson) Conversion to 6550s Clean power. 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. It doesn't look like a Marshall tone stack. Standby Switch Installation, 2. Custom, hand-built tube amplifiers for guitar. Marshall JCM 800 Mod 17. The Remedy is available as a head only and pairs nicely with any of our extension cabs. Tone Stack patents. Inside Look: The Marshall Tone Stacks January 29, 2019. The back panel includes 4,8 and 16 ohm outputs, the half power switch and the EQ bypass footswitch jack. The Attenuator resistor is bypassed with a 470pF Bright cap (also called a treble peak) to allow high frequencies to go around the resistor to keep the tone bright. The tone stack was a bit different, so they were a bit dirtier. 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. Third, the rest of the preamp (and power amp and power supply) plays a big roll in setting the voice of the amp. More preamp gain by bypassing the tone stack / EQ circuit. Marshall Bass 200W 3520 Schematic. Marshall Amplification is a British company that designs and manufactures music amplifiers, speaker cabinets, brands personal headphones and earphones, and, having acquired Natal Drums, drums and bongos. The true 6CA7 and 6L6GC-family, including the 5881, have a tone similar to the 6550, with the lower powered units. The following Marshall Super Lead tone tips and tricks will enable you to get much more versatility out of this legendary amplifier. So, I'm looking at the tone stack for my vintage Traynor here: 51257 This seems very similar to the classic Fender/marshall tone stack: 51258 With the treble cap being 330 (with a 1M pot), the bass cap being. Unnervingly, if you see it enough it even begins to make sense. I added a regular tone stack. Ken Fischer says that the. I recently found a demo with no mod description and it sounded very Marshall Plexi like on the lead channel. 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 channel controls: bass, treble and volume Vintage. This comes before the tone stack and provides a different effect than just turning down the tone control. Mains hard wire replaced by IEC. The ideas and theory at work here can easily be tweaked, modded, and applied to the modding of most any Single Ended tube amp similar to the VJr, such as the venerable Fender Champ. MOAAH wrote:Cool thread, but no input on Wizard amps?. The mod also slightly increased the gain of the amps. Standby Switch Installation, 2. 100kB) for smoother control – Wiring from footswitch to main pcb was ribbon cable – Diodes were different type (1N4148 vs. "On the high-gain channel diodes are used for gain/clipping. A handwired Marshall legend. Remod and restauration planned for 2. It is brighter and harsher sounding and the overdrive is not the same. I can assure you that an EL-34 powered, plexi-modded bassman head through the right speakers can do a very convincing Marshall impersonation. It can be downloaded here. Jun 26, 2017 - Fender/Marshall/Vox Treble/Mid/Bass tone stack by RobRobinette. The Fender Tone Master Twin Reverb is a stunning facsimile of the timeless all-tube Twin Reverb, built using the latest in lightweight digital amplification and premium neodymium Jensen speakers. MARSHALL KILLER - Quilter Labs Overdrive 200 Amp Head - Usa. The new caps have corrected values to open up the tone and get rid of that boxy sound. 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. 047 µF capacitors. The classic Marshall Tone stack tends to emphasize the upper mids, which in turn tends to drive into distortion sooner in that layer. The Ultra mode has an even fatter, more robust tone. Standby Switch Installation, 2. This mod will improve your Marshall's Clean tone. Blue Moon Lite Schematic July 10. 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). We chose to omit the tone stack and the associated buffer stage from the Marshall Super Lead schematic for two reasons. Click to open in a new window. 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 Equinox Overdrive project is a clone of the Marshall Guv'nor / Drivemaster. It utilizes a combination of top of the line Mustard style and Orange Drop Caps (oriented by ear) along with Carbon Comp RI in a simplified layout to improve the Tone of your amp across the entire spectrum. 2K 680 to 1k 1. Colorsound (Sola Sound) Fuzz (Stellan's Schematics); Overdriver - OK!I like this pedal! Initially designed to do clean boost. Marshall Class 5 Mods. [It's often a good idea to add a large capacitor before the tone stack to block any DC that might get around your bypass. The tone stack has an extended range. It can be used for a very subtle treble cut, or a ‘Deep Rhythm’ tone, as was emphasized on the Telecaster guitar tone controls (another example of a crude treble cut).   This gives you the ability to remove the mids all together in the first part of the pot rotation then bring them in as you turn it up, nice touch. Jimi used 1966 Marshall Super 100 amps, and had the tone stack of the amps slightly modified to provide a treble boost and a bit more bass. Oh yeah, I took out the negative feedback. 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. Components: Values can be altered simply by double-clicking on the component. The next consideration is the tone stack. Way too much gain, too little decoupling, lousy tone stack. Class A; Push Pull 6V6 - enriched fixed bias; Single channel: Treble, Mid, Bass. Tone Stack - Replace the awful Bass and Mid caps with high quality WIMA caps. The legendary Spinal Tap axeman recorded the studio version with his 1959 Les Paul Standard into a JCM800. Not sure why Marshall doesn't stray from convention and make a 1974x with a tone stack. Way too much gain, too little decoupling, lousy tone stack. 022uF Mullard signal cap replacing the 0. Les Paul Lover Duke of Orange Posts: 6774 Joined: Tue Aug 18, 2009 9:08 am Location: Derby, England. Gerald Weber also says he's seen a lot of amps this way, but he personally prefers the. Make your combo sound like an old California amp. John’s and Pete’s desire (and escalation) to have the loudest gear was the impetus for Marshall to build the first 100-watt amplifiers. I feel like i’ve talked about it, the same thing earlier. Blue Moon Lite Schematic July 10, 2013 admin 2. Mesa Boogie 3-channel. He said the 6A20 preamp section is similar to that of a '62 Brownface Bassman (6G6-A). The MOD 101 Amp Kit measures 8 1/8" in height, 19" in width (including handles), chassis width is 16", depth is 8". That is a very high value for the "mid" (62K)--try reducing that value, that will also reduce some of the bass. Treble MEANS treble and bass means BASS. I'm still waiting for the new speaker, should be here Wednesday. Change the pots to mil spec as the replacements have a life of about 5 years. Marshall JCM 800 16. 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. Again, the untrained eye can see the difference between the two. Marshall Class 5. - It has a 220pF cap across each 470pF treble cap in each tone stack (as with the Plexi Channel mods). Make your combo sound like an old California amp. EVH 5153 100W Blue Channel 14. Tone Stack patents. More preamp gain by bypassing the tone stack / EQ circuit. I just used a standard Marshall tone stack whereas the JMP-1 uses a standard Marshall tone stack but the pots are replaced with fixed resistors but those values don't necessarily correspond to the pots at noon. 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 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. 5 thousand, with the modifications it would be around 118 thousand. It's subject to change but I think this will be the general idea. It has sustain with mids and highs that cut through the mix - perfect in a band setting. x, version 2. There aren't enough preamp valves to implement two PPIMV circuits, you would need six - plus dual-gang pots to make two separate tone stacks. These pages contain detailed directions to make the unused triode section in a Blues Jr. 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. Things changed very quickly, however, as the tubes used in the old Bassman weren't readily available in the UK, so they switched to KT66. 022uf PI coupling cap switch (the same principle as tone stack switch) - 100pf PI cap instead of 47pf - 0. I’d go for the Wampler Plexidrive. 1uF tone stack mods. In fact, it is often referred to as the FMV (Fender Marshall Vox) tone stack circuit. Welcome, Guest. Modification price: 199,00 €. I just used a standard Marshall tone stack whereas the JMP-1 uses a standard Marshall tone stack but the pots are replaced with fixed resistors but those values don't necessarily correspond to the pots at noon. The Marshall Podcast is hosted by Dan P. You provide the tools and solder. The classic Marshall Tone stack tends to emphasize the upper mids, which in turn tends to drive into distortion sooner in that layer. 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). The problem here is it is tuned for pretty strong mid range. 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). Stock, I dialed in an OK bass distortion tone with tone about 11:00, level about 1:00, and distortion about 3:00. 680pF) are different from the Red channel. Remove these and install two 0. The unit comes with two speaker cabinets to make up the stack. The 'No Feedback' position makes the amp break up early kind of like a 5E3 Deluxe. Unnervingly, if you see it enough it even begins to make sense. Even Marshall makes a 1-watt head now. Cheers, Tim C. I had just a few thoughts come to mind regarding modifying amps, modifying EQ, or creating your own. Choose your tone. I can assure you that an EL-34 powered, plexi-modded bassman head through the right speakers can do a very convincing Marshall impersonation. Level, Tone, and Drive The Keeley mod adds a switch to the right side of the unit that changes the diode clipping style of the distortion. The best Marshall tone I've heard came out of the head through a Marshall basketweave 4x12 cab loaded with Greenbacks. A handwired Marshall legend. MOD 101 DIY Guitar Amplifier Kit. The four KT-66 output tubes provide a timeless sound (and a TON of volume!). 022uf Mallory 150's Change to. 02 (along with an 18k resistor). With this mod, these amps hang in there with modern German and American amps, without loosing its marshall pedigree. 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. All you need to provide are hand tools, a soldering iron and solder. I put in a switchable tone-stack bypass, which was downright transformative, no pun. 7 Powdog 4 years ago Not sure why Marshall doesn't stray from convention and make a 1974x with a tone stack. This is great for learning new songs or just playing along with your favorite music. It's capable of tone from clean jazz, crunchy blues, to raunchy classic rock. We had to tap the FX loop pre tone stack in order to get a line level loop that worked for both the crunch and lead channels. Perhaps some of you know a mod that could keep the basic Traynor circuit, but mod it for a Marshall 18/20 watt-like tone? Let me know what you all think. Here's a French article I found a while back. It's tone stack, tube configuration, preamp and power section has inspired numerous amps builders including Jim Marshall, the founder of Marshall amps, who used the Bassman tweed 5F6-A circuit in 1958-1959 as template the legendary Marshall JTM45. In fact, it is often referred to as the FMV (Fender Marshall Vox) tone stack circuit. My mods let you choose between an initial (pre-gain) highpass at 187Hz or (switched) 33Hz. My first Marshall, after years of going for other amps and going after the "Marshall Tone". 02 cap in the "middle" (actually the bass cap) is usually a. The DLS absolutely bests Bias' internal preamp sim for warmth and dynamics. For all comparisons, the Marshall tone stack is: Bass-5, Mid-6, Treble-7. Part of the Vintage Series; Introduced in 10. Marshall Mods Page. 1uF tone cap, and a new 0. Dear Amp Man, I am unable to find anything on cascading the half-unused tube in an AA371 Bassman. Frondelli Last year, Fender did the unthinkable…they commenced tube amp production in from the 6G6 -B Bassman of using a preset tone stack internally to shape the typical "scooped" Fender tone. Welcome, Guest i made first the Layout posted here without mods. Ergo the two bypass modes. It's subject to change but I think this will be the general idea. 3-Way Negative Feedback Switch. Gets rid of the shrill, lackluster tone and makes the amp sound more like the vintage AC4. Here are the values I used: C6 Silver Mica 250pF/500V C9 Mallory 150’s 100nf/600V C10 Mallory 150’s 47nf/600V. Built using the best hand picked electronics sozo capacitors for the tone stack. But the DLS' true Marshall tone stack is what made it my first choice - for my practice rig, I can tweak tones easily with real analog knobs as if it were an amp, and not have to fiddle much with virtual controls inside Bias. - Custom Builds. Boy does it BOOST! To control the gain and make it more like a distortion pedal, put a 10K or 100K volume pot at the end of the circuit, that way you now have a drive and volume pot arrangement. This is what I consider somewhat of a guide to the Marshall Class 5. 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. " How close is this tone, subjectively, to an actual Fender Bassman amp? I surmise that the original Bassman amps rely on the 4 10" speakers for more than a bit of their lovely tones. 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. still that nice Marshall crunch and mid range, but much more "omph" to it. 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. Marshall MG15MSII Microstack is a complete Marshall stack that will fit into any room. This is one of my favorite amps and was one of the reasons I bought my Kemper in the first place. Just like. The Speaker is the Same - Marshall/Celestion 'G10F-15'. the offset's, were, essentially, a Bassman clone. The mod R10 2k, C4 0. I remember when I got my first one. I added a regular tone stack. Those looking for the true Marshall sound only need use an original, unmodified Super. The C5H, 5 Watt Amp from Marshall in 'Head' Format. May 07, 2020, 01:15:46 AM News: Ceriatone Forums are up and running!!! Guests please register Note: If you want to help you can to keep the forums alive. If you do not see your amp listed please contact us!". Also during this period, the 1987 Lead and 1959 Super Lead model circuits were updated. The tone stack mod has been included in the recreations. Twin Stack Mod, 6. 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. 1uF tone stack mods. If you do not see your amp listed please contact us!". 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. The Ultimate Tone, Vol. A standout feature of the Katana-Artist is its custom Waza 12-inch speaker, which produces tones inspired by the benchmark 25-watt British stack speaker from the 1960s. 00; Original controls: Bass, Mid, Treble, Presence, Volume. Riff Ron's Electar Tube 10 mods. Using the multiple channels, reverb, FX loop and tone shift controls you can. the second one a cathode follower (to feed the tone stack) and the PI. This is a fun little amp to modify and a great place to start if you’ve never done anything like this. Marshall Class 5 Combo - Made in the UK - I am no longer modifying these Amps - The Following is for Information Only. Marshall 9200 2X100W Schematic. To further enhance the lifetime of the ECC82 driver stage tube, the stock 39kOhm anode resistors were raised to 47kOhm and up to 56kOhm in the second series. Check out what happened to it. I just used a standard Marshall tone stack whereas the JMP-1 uses a standard Marshall tone stack but the pots are replaced with fixed resistors but those values don't necessarily correspond to the pots at noon. The starting price was $1,000. Modification price: 199,00 €. The back panel includes 4,8 and 16 ohm outputs, the half power switch and the EQ bypass footswitch jack. You turn up any knob and you really hear the changes in tone. This is perfect for beefing up a Strat or pushing an amp hard so that you get more natural tube amp distortion. To give this control a more "logarithmic" feel, add a 25k between the wiper and ground. Analogman King of Tone: Another overdrive based on the Marshall Bluesbreaker that is coveted by guitarists and has about a year waiting list just to get one. There are many mods you can find for this and here are some of my favourite. I added a regular tone stack. Marshall Mods by Voodoo Amps. The tone stack has a very wide range and we have found it works great with all types of pickups including active. It utilizes a combination of top of the line Mustard style and Orange Drop Caps (oriented by ear) along with Carbon Comp RI in a simplified layout to improve the Tone of your amp across the entire spectrum.   One other tweak was the “Twin tone Stack” mod, which comprises a jumper between the left/middle legs of the middle pot. Overall, the amp is extremely responsive. I posted this at the Les Paul Forum because a few asked for it. I used Mallory 150’s and silver mica caps and 1W carbon film resistors. I’ve been eternally impressed ever since.
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