Important: See this page first to view the full list of compatibility so you know which of the two models (standard or reverse-wired) to choose before placing your order. . For the Purist Vintage Players - No High Gain stage. At least now we assume that this is a "false" statement. The Marshall Super Lead is a two channel amplifier with high and low sensitivity inputs for both channels. Marshall JCM800 1-CH Series Mods . It's a 100 watt Marshall 2203 JMP Super Lead Mark II made in 1980 that been quite heavily modified by Steve Dawson of Root 2 Amplification and formally R&D Design Engineer for Marshall between 2005 to 2014.He is the guy that designed amps such as the Vintage Modern, JTM45/100 reissue, Super100 Jimi Hendrix, JMP1W head and combo, 1962 . #2. knox1987 said: -anyone here know by seeing inside guts of a Marshall tell if is modded? Anyway, its a 1986 Marshall JCM 800 4212 and I'm in love with it! 2203 , , , AFD100 . This thing is a BEAST as I added an extra gain pre-amp tube 12Ax7 to it. 2203 extra gain stage mod. It's a mod that Bruce Egnater had published in Guitar Player magazine back in 1995. 87. This amp was originally a model 4103(Combo) and was converted to a model 2203. #1. bass, middle, treble, and a two volume controls for gain in overall master volume. So far I've split the cathode at V1 to make it more plexi like. Select Plexi Cleans/Break Up Tones or Killer Crunch (via switch) Way more punchy + dynamic than factory tone. Bordeaux, France Marshall JMP "VHM High Gain Mod." MKII 100 Watt 2203 1978 Used - Excellent $1,761.19 + $234.83 Shipping It looks like that piece of gear is gone. A Les Paul was used using higher gain channel. I bought time ago a book called "inside fender and marshall . 2. Oozing rock status, you can effortlessly detect its distinctive 100W roar. 0.1f coupling caps at the output to fatten the tone a bit. 2203. Easiest mod with 2203 is to decrease the size of the second stage cathode resistor (I like 6k8) and consider a 0.1uF bypass cap for it. . I'm high rate seller in Ukraine and CIS countries over 10 years, check my site . Granville, IL. I'm curious as to what are your favourite mods. I think it was a modded 2203 but i cant be sure. No boost pedals or post processing. Tone stack mods: This mod primarily involves reworking the tone stack and changing a. few bypass capacitors. Head) Any way you look at it this is an early Marshall JCM 800 Made in 1984. . What are people looking for?Jerry. An old interview with CKLN 88.1FM Radio, James . Location. 2. This seems to be the "sweet-spot" on these amps. change R61 from 33K to 56K change C37 from 470pF to 250pF Gain mods: change R7 from 4.7K to 10K change R10 from 100K to 220K - change C8 from 470 pF to 100 pF change R37 from 22K to 10K . About the Mods. 100% switchable in and out from a stock Marshall. Plug the guitar into the input of the A/B box and then plug the box's A and B outputs into channels 1 . As a result, there was a slew of experts modifying amps to produce more gain. One of my favorite MY OWN amps. . . 1989 Marshall JCM 800 2203 . Locate the 68K input resistor (R3) and place a 330pf 1kv ceramic cap across it. Change the bypassed resistor in the same area to a 220K or 100k. . This is what the Jose mod did which is the basis for basically all modded Marshalls (like Friedman etc) and the 2203/"jcm800" circuits are kind of like Marshalls take/advancement of that (using a cold clipper on one gain stage). Marshall 2204 what mods? Change the voltage divider to a 1 meg and 220K pair. I recently bought a modded JMP 2203, and I'd very much appreciate some help from the amp experts here with the following issues: 1. Amp is at my studio - Dnipro, Ukraine. - , Slash, Billy Gibbons, Kerry King . Well not really, but yes you cascade the channels in 1 wire. Some of said mods were amazing, others weren't, but they all had three things in . Adelaide, Australia. When you turn up the preamp gain in one of these amps, you're getting more cold clipping. These modded amps are where Marshall got the idea for the 2203 Master Volume preamp described below. All of these mods (other than the tone stack mod) should be done one at a time. The low input is less rock'n'roll, but useful for those who use a pedalboard and their own distortion. Jul 21, 2022. Enjoy! All the components are inside of a urinal cake looking object and glued to . Marshall 2525H Mini Jubilee 2-Channel 20-Watt Guitar Amp Head $1,295 Used - Mint Add to Cart Amps Guitar Heads Marshall Ontherocks! I did some work on a 2203 a couple of months ago actually. Comment. provides the holes in the PC board to mount it. Many high gain amps use solid state rectifiers which do not have a filter . Marshall JCM800 2203 Friedman BE-100 with Hi-Gain Mod, almost unplayed. 5uF cap. !" Interrupt Fx-Loop Mod $99.00 Tube Buffered Fx-Loop Mods 1 & 2 "Perfect for shred-players & fans of legendary 80's players like Sykes, Lynch, Dimartini, EVH - Tons of tone! We know about Eddie helping his buddy out by saying that Jose modded his amps. From what I remember, both Friedman and Suhr (who worked on EVHs amps with the Jose mod) built their amps with that mod stock. This amp is a JMP 2203 so the master knob is a Pre phase inverter master volume so the extra knob that it is i the far right side should be a post phase inverter master volume mod. Its foolproof interface, distinctive roar and larger-than-life edge immediately set the standard by which all other rock amps were judged and it remained the industry benchmark throughout the entire 16 years of its production life. I can do thick, heavy modern high gain tones, hot rodded 80's tones, fine tuned 2204, effects loop, EL34's or 6550's, etc? The most classic example of a cold clipper stage is probably the one in a master volume Marshall 2203 (100 watter) or 2204 (50 watter) which is the clipping circuit associated with the preamp gain control. Ok, I was searching about post and pre phase inverter master volume mod and I remembered that Phil has this Marshall with some mods. This amp is very clean with not much wear as you can see in the pictures. Put an 12AT7 at PI to tame the harshness. I have removed four LEDs (LED 1-4)that somehow limit and compress the signal on the clean channel and now it sounds like a real tube amp,though this mod will actually increase the HEADROOM of the clean channel.You know they say "marshall clean" when talking about how mediocre marshalls are on the clean ch,but this will take care of the "marshall sindrome" on this model.You will also loose some . 292. the SE-100 is basically a 4 gain stage modded Marshall and the others are different things. Marshall JCM800 2203 "High Gain" Jose Mods Standard Mod $395.00 Deluxe Mod $719.00 Platinum Mod $1157.00 Platinum Mod $1157.00 International Customers! First up, here is very bad sample of the official Marshall schematic for the 2203/2204 preamplifier section. . Mods #2 and 3 will not really increase gain, it will simply darken the overall tone. No extra tube needs to be added. This will be a little more challenging. The object here is to decide where you need the 'improvement', and to try a few of the remedies. Would also include the 'Stage One' mod that amp had. However, the SL-X Master Volumes are known for introducing a third ECC83 valve in the gain stage, so this may be a result of the pre-amp's design change. At its heart, and in terms of its aesthetics and power, the . This will beef up the gain. . most famous guys mods are kinda basic: - changing the first couplings caps for lower values (usually around 1n to 4n7) to keep tone clear and mid focused - adding cathode caps to the later stages to boost more mids and gain - getting rid of the fizz with small caps (from 39p to 1n) wired to the ground or wired in parallel with plate resistors Blog. This puts the gain stages in series (more gain) whereas jumping the channels runs the gain stages in parallel (mixes gain). Posts. The Hot Mod V2 has been found to work well in a variety of Marshall 1959/1987/2203/2204 clone and similar circuits including: Ceriatone, Germino, Mojotone, Wangs, and Bugera (Bugera needs reverse wired model and is compatible with pre-Infinium 1960 model only. Tube Guitar Amp Head Marshall 2203 JCM800 Master Volume Lead [1981-1989]: . "Get inspired - Upgrade your tone now!" "We have designed countless Mods since 1998. by Necrovore Sun Jul 22, 2007 2:20 am. Start new topic . The art of the JCM 800 is its simplicity. Introducing the LegendaryTones HOT MOD V2 EVO, a plug-in dual tube module specifically engineered to dramatically increase gain in Marshall amps. 32/32f PI and 16f preamp power cap. The circuit will be modded to 12xxx spec and Rockstah's Mod5 modifications, following SDMs 2-in-1 layout for the switching of the stages (not accounted for in this schem). Gain Mods (These make the amp a bit grindier and are what I was using until the mod I did below) . Jose was legendary for his gain stacking mods - often adding an extra preamp tube. . It is single input, two channel, reverb equipped 50 watt combo. Technical Specification General Model SC20C Range Studio Electronics Output wattage 20W (with power reduction option to 5W) Outputs 5 x 1/4" jack sockets, selectable 16 / 8 / 4 load Inputs 2 x 1/4" jack instrument inputs (high/low sensitivity) Controls Presence, bass, middle, treble, master volume, preamp volume Effects None Effects loop This will beef up the mids and lows and make the entire amp feel more "meaty" and "thick". If you dime the gain, mod #1 makes absolutly NO differences. Marshall Amp Schematics to assist you with your amplifier repairs and modifications. Cascading channels on the plexi means both channels are running simultaneously, cascading means one runs into the next. It's a crunch mod, it has more gain then a normal . See more ideas about guitar amp, marshall amps, guitar. Locate the 10K cathode resistor (R6 found on V1B) and replace it with a 4.7K resistor. Reply #10 on: May 01, 2007, 01:03:19 PM . For all JMP models including 2203/2204 . The Lynch Mod will work in both Marshall JMP and JCM 800 models 2203/2204/1959/1987 as well as a number of other models including the latest reissue models. and adds a "urinal cake" which essentially is a circuit that contains all the mods that goes in front of the first gain stage of a stock 2203 circuit. I had a Voodoo modded 2203 with the Jose mod and my Splawn nails that IMO. Search for gear like this Watch Marshall 2061x 20-watt head with a 2061x Mod I, lower gain channel, owned by Van McLain of Shooting Star. I want to add another switch to add an additional 2.7k/.68u stage on the front of the 2203 from above. DIY Marshall JCM800 2203A 100w Tube Amp Kit VERSION 2 And modding it to Super Bass specs. Contact. The amp's master output has to be turned up to a certain point to really get the warmth and reaction." . Lot of mids and bass you won't find on regular jsm800 2203. Marshall 2555 Marshall 2203 Caswell Mod '05 Gibson Les paul standard faded '78 Gibson Les paul standard Martin Acoustics Duncan pickups Marshall Greenback cabs. The first of our amps to feature a master volume for you to control your sound. Add a 5uF cap across the second stage 10K resistor. Convert to JCM800 2203 power section: change R17 to 100K (if not 100K already) and remove C6 . Interestingly the reactive load seems to load the amp more than my speaker cab, so the levels of gain generated seem higher. Tubes? "The sound comes a lot more from the output of the amp as opposed to the pre amp gain. The old low input is now the high input and the old high input is the MEGA GAIN! I have circled a few areas we will look at. You might start off with just a simple voltage divider of 470K/470K following your gain stage with the usual Marshall type specs of 100K plate . The classic grind was back with the preamp juiced up a bit with the touch sensitivity and punch that 100 watt Marshall's are know for. Organic enough for vintage rock and blues, and molten enough for metal, the JMP 2203 is the clear bridge from the classic rock amps of the late-'60s and early-'70s to the school of heavy-metal-approved amplifiers that would proliferate in the quest for more gain. From what I understand, you can change a few components inside without adding another gain stage and still have some nice gain! Isn't a splawn already a hi gain mod type of amp though? The going price for a gain mod with depth control. Marshall 2204 w/ 2203/2204 Mod/Rework - First half is a Les Paul w/ PRS 8 pickups, the second half is a Strat w/ a Duncan '78 in the bridge. Please try them 'one-at-a-time', and decide when to say 'when'. 1. JCM800. Well not today, but this week! Marshall JCM800 2203 Mods. I've just done testing a high gain mod on a 1982 50w Marshall JCM800. Apr 16, 2017 - Explore David Keegan's board "marshall mods" on Pinterest. A good FX loop should be put in Most mods I've ever seen guy do to make a 800 high gain suck. The guitar plug even needs to be plugged from the Low input into the High input! Each channel's High and Low jacks function just like the Fender standard four input circuit. Amp was hooked to a dummy load and recorded direct with impulse responses. JMP KRUSE VINTAGE MOD. Contact Form. Amps and Cabs Mods for JCM 800 Marshall 2203 100 watt GrecoVee Jun 23, 2008 G GrecoVee Member Messages 880 Jun 23, 2008 #1 Hey Guys, just picked up an early`80's Marshall 800 2203 100 watt head with the vertical inputs over the weekend for $850. You have a high input in a low input to get your overall volumes more tailored to your liking. Re: 1983 Marshall 800 2203 Mike Morin modded amp. A clean and a distortion channel in one amp! Extra tube gain stage - 'Bainzy mod'. There are loads of mods but these often change the character of the amp. The HOT MOD V2 EVO requires NO chassis cutting, drilled holes, or wiring modifications to your amp - it simply and easily installs in place of the middle V2 tube position. There's a high pitched whistling sound coming from the amp, which is worse when using a single coil. While the mods installed years ago had served their purpose at the time, the amp now had its original tone and feel back. Typically high gain amps need a very clean, stiff voltage supply to prevent oscillation so voltage sag is unwanted. Myth or Reality. Part one, showing the initial inspection of the amp and common issues with Marshalls from this era.More details on this amp and hundreds of others can be see. I bought a footswitch separately and it came in today, so I really for the first time just let this thing loose this evening. Up for Auction is a Marshall JCM 800 Guitar Amp Head/ Mod 2203! We have added in a series FX loop, simple and effective. "Finding that balance between pre vs. power amp gain, sag, sustain, dynamics, and touch-sensitivity in an amp has been a perpetual challenge. Preamp Tube Gain Factor; Basics Of Vacuum Tubes; Power Tube Matching; The Perfect Pair System; PLEXI CLEANS/BREAK UP + KILLER JMP CRUNCH. Nothing too exciting, mainly upgrading the components - sprague atom filter caps, orange drop coupling caps, and added a push/pull mid boost to the treble control. 3. So the TAE allows me to run the Marshall as hot as I want, into a reactive load. There are also plenty of mod to do or how to do . . Marshall JCM800 Lead Mstvol 100W 2203 Schematic Marshall JCM800 Lead Mstvol 50W 2204 Schematic . This mod primarily involves reworking the tone stack and changing a few bypass capacitors. He ended up buying a Marshall JMP 2203 head over in Denmark. Marshall even provides the holes in the PC board to mount it. I found these Super Bass specs on the Marshall Forum: -Shared Cathode V1 -no brightcap Vol 1 Jose Arredondo high gain mod. Replace the .68uF cathode bypass cap on the first gain stage with a 5uF cap. Equipped with a pair of JJ ECC83 (12AX7) tubes, the Lynch Mod adds a gain stage to your Marshall that's been tuned and approved by the ears of the maestro George Lynch himself. Used by artists around the world, this amp continues to be one of our greatest. 2 Channel Mod The Marshall 2203/2204 Master Volume amps, introduced in 1975, were a big step forwards for Marshall. Stock #36 mod - same circuit as above, but the mods are always on. The mod makes the amp sound much better tone wise but it's not going to make it super high gain. So the grain Marshall bidouillable . One of many of Eddie's blinds he used to keep a lid on his tone. * Add a 5uF cap across the second stage 10K resistor. I will see if I can find a fairly old but long thread from Metroamp forum. Jumpering the inputs runs two gain stages ("channels") in parallel for more gain, however this is still less gain than one of the more usual JCM800s (2203,2204) that has the stages in series. The TAE then provides a post amp FX loop and onboard roland sde3000 delay and plate reverb. . 1. The simulation posted above doesn't look right at all. 3. The clean sound is very very long, however, providing color Marshall 2203 to your basic sound without distorting it. While Boogie were the first kid on the high-gain block, when Marshall unleashed the 2203 in the mid-'70s, it was a game-changer due to its aggressive yet hard-rock-friendly roar. Reaction score. from what i'm reading dookie was a modded marshall 1959 super lead, which is a non master volume amp when stock, which would need a pre phase master volume and the pre-amp gain stages cascaded to make it sound very similar to a jcm800/jmp 2203, this is a very common mod for non master volume marshall's to get more pre amp gain and saturation at Mimmotronics Mods. In my opinion, my JCM 800 2203, when used with hot pickups, needs juuuuust that extra hint of gain and compression to be able to us it for \m/. 50/50f power cap and solid state rectifier to tighten the feel. - Typically the signal then goes to whats called the Cathode Follower (v2) which drives the tonestack at a low impedance (this IS the marshall sound, so I doubt this section was modded.) I'm a big fan of using a choke between the power tube plate and screen power nodes like the 5F6A Bassman and Marshall JTM45, Plexi, 2203 and JCM800 amps. Extra tube gain stage - Stock #39 Appetite For Destruction amp mod. I have built a tube amp before (Fender Deluxe Clone) but that one was built entirely to the specs (no mods). The Platinum AFD Mod will cost you $1200 alone from Voodoo Amps AND you will have to pay to ship your amp there and back 26-rig fngslet for at true statsministeren p livet JMP amplifiers, 1959/ 1987/ 1992/ 1986 (non-MV) 2203/ 2204 (MV) Moderator: longfxukxnhair Standard, Deluxe, Platinum "AFD" Mods & FX-Loop Upgrades Servus lebt regionale . The final outcome was an amplifier that once again had that "mojo" of an original 2203. By JerryP, July 17, 2006 in Amps. Marshall JMP 2203. For those interested in taking advantage of both channels to employ a clean sound as well as a dirty one, you need only use an A/B box. Marshall 1982 JCM 800 2203 Mesa Boogie MKIV Marshall 1960TV 2x12 V-30's Eminar 4x12 2x12 Celestion Gh-80's. Top. Classic Marshall Tones at their best ! I'm updating people on what I found about the Marshall gain mod. . 1. The very essence of simplicity, the JCM800 2203 is a 1-channel, all-valve amp with no reverb or built-in effects. Marshall 2204 what mods? If you do not see your amp listed please contact us!" Marshall even. probably 6550's or EL34's. Replace the .68uF cathode bypass cap on the first gain stage with a. Unfortunately channel switching isn't possible, neither on the amp nor with a footswitch. The Low inputs have their guitar signal cut in half by forming a voltage divider with the two 68k Grid Stopper resistors. you can get a ****load more gain from a stock 2203 by removing the V1b 10k cathode resistor and putting a 2k7 resistor and 0.68uf capacitor in parallel in its place. Based on some internet research, I've tried swapping preamp valves, but to no avail. Guitar plugged straight-in, one track per channel. . Marshall JCM800 2203 Friedman Hi-Gain Mod JCM800 2203 (!) I do this easily with my Maxon OD808. Marshall JCM 800 2203 (modded by Dave Friedman) used for the recorded distorted parts of Apocalyptic Love and World On Fire; Marshall JCM 800 2203 . I thought Splawn did too. Also, you can remove that cap bypassing the resistor, and see if you like it (or add a switch). ,got jcm800 combo in trade that has massive gain close to my UberschallBluewas informed 4211's couldnt be modded but this guy had showed me a big list and receipt of work had done to it. distortion.I have used Power Brakes as well to get the power tubes to break up.When you A/B the 800 to the modern hi gain Marshall amps the 800s clearly have a better sound with much . I happen to like the way it turned out and thought I'd share my joy with you. Marshall JCM Series JCM800 2203 & 2204. . Metallica is another band that had Jose modded Marshalls. NO DRILLING - FULLY REVERSIBLE . mk1 mk2 mk3? The preferred Marshall platform to start modding. These mods are made to make the amp with the gain rolled back sound the same as when the gain is dime (in order to reduce the overall volume of the amp). Personally, I prefer it to the 1000 crystalline sounds of hi-gain amps current. Both mods 100% switchable. Marshall 2555 Marshall 2203 Caswell Mod '05 Gibson Les paul standard faded '78 Gibson Les paul standard . 500pf/33k at the tone stack. Jan 3, 2017. This will let a ton more level go to the next stages, instant gain increase. the Randy Rhoads mod on the 1959 put these stages in series for more gain, closer to a 2203 or 2204. HIn Senior Member Posts: 133 Joined: Thu Nov 02, 2006 5:51 am. Similar to 2203 JCM800.