The jcm 800 is a classic amp in the history of marshall, and has been the basis for many of the brands leading signature models for guitarists including zakk wylde, slash and kerry king. The simpler 50 watt power amp is shown below but the 100 watt power amp used in the super lead plexi and 2103 and 2203 master volume amps simply had two additional power. The 2205 and 2210 also featured a valvepowered spring reverb, with global presence and master volume controls. Building a marshall 2204 jcm800 50w clone my les paul forum. How to get classic marshall jcm800 tones using guitar. I know that the jcm800 has an extra gainstage in the circuit when using the high input, that wasnt the case with the 1980 jmp master volume amp was it.
Ill build the original 2204, play it for a bit, and then maybe tweak a few components later. Marshall jcm800 4010 explain these circuit tweaks the. Jcm 800 should be a 2203, you can pull out 2 tubes nad have a 50 watt version so youve got both yeah, i know the trannys are different. Then there are of course the 3005, 5002, 5005, 5010, and 5205 lead amps, the 3203 and 4203 artist amps and the 4001 studio, which all of course are genuine jcm800 series amps. Next on the to do list is auditioning different pickups in your guitar. The jcm800 power amp follows a long lineage of classic amplifiers that include the. Here im demoing a cleaner tone using the amps low input jack. Marshall jcm 800 lead series model 2204 50watt master volume. And just like all of our kits, we dont just hand you a schematic and wiring diagram and throw you to the wolves. The simpler 50 watt power amp is shown below but the 100 watt power amp used in the super lead plexi and 2103 and 2203 master volume amps simply had two additional power tubes in parallel with the two shown below. Feels like time for me to build a marshall 50 watt. The first of our amps to feature a master volume for you to control your sound. Marshall 1987 lead, 2204 master volume lead and jcm800 lead series 50 watt power amp.
When i go from 1 to 9, its souns as it should be, but when i go to 10. Diy build or rebuild kit for a marshall jcm800 2204a. The jcm800s also offered a simple series effects loop and a di output with a level control. Instruction manuals and kit build layouts for ceriatone amplification guitar amplifiers and effects loop buffers. Diy marshall jcm800 2203a 100w tube amp kit version 1. Diy build or rebuild kit for a marshall jcm800 2203a.
We have the marshall 1987 jcm800 50 watt in stock in our vintage collection. I scored a 1983 jcm800 2204 last year and i was wondering whats the difference between this head and a 50w 1980 jmp mv head. I have a chance to buy a jcm 800 cab with 75s at 16 ohms at 300 watts. Amplifiers contain voltages high enough to kill you even after the amp has been powered off if you dont have enough electronic experience to identify and discharge the filter capacitors which contain these deadly voltages, take your amp to a. Shop now and receve free shipping on your order today. How the marshall plexi, 2204 and jcm800 amplifiers work. Marshall jcm 800 lead series model 2204 50watt master. Marshall jcm800 4010 explain these circuit tweaks discussion in ampscabs tech corner. Any idea where i can get the schematics for that extra tube stage. We were searching really long for a good amp at that time. Yes, the amp is nice and warm and it has a good bit more preamp gain than stock. The 50 watt single channel jcm 800s 2204were pretty much the same thru all production years, differences being board mounted pots and the horizontalvertical input difference. Prowess amplifiers offers resources for the guitar tube amplifier builder. The signal is amplified and flows out the tube plates where one tube pushes the signal through the output transformer primary.
There are hundreds of pages of tube amp information on my library page. A jcm800 50 or 100 watt after a lot of reading on marshall jcms and revisions etc, i know what im looking for. I am nervous about the cab not sounding good unless i crank it up. I am nervous about the cab not sounding good unless i. Marshall 25 anniversary silver jubilee 50 100w 2555 schematic marshall 30 anniversary 6100 100w schematic marshall 30w 5203 schematic marshall 50w 2204s schematic marshall 50w 5210 schematic. Besides the bleedover problem, i just cant dial in any usable tones out of this thing. I myself used a jcm 800 50 watt combo back in the 80s, and as a young teen. Just got my chassis in today and i hope to have this thing built and running by christmas. Every thing seems to work fine, but i have some osrt of a problem with preamp 1mohm potentiometer. The type 25 50 is also a reference to this feature. View and download marshall amplification amplifier jcm800 kerry king signature owners manual online. This amp was built for export to canada so there are a few differences between these and the us models. Hi, we can only confirm that this cap set will work with the following amps.
It was the 2203 100 watters that changed filtering and the earlier ones may be preferred. Marshall jcm800 2204a 50w tube diy amp kit version 1. Marshall amp heaven schematics jtm45 jcm50 jcm600 jcm. The allvalve jcm800 2203 is one of the most highly respected 100w marshall heads in the companys long history. This will be my 9th amp build and highest wattage, my first with el34s. Oozing rock status, you can effortlessly detect its distinctive 100w roar. Evolving from the legendary plexi head, it was one of the first marshall amps to feature a master volume control. Marshall jcm800 50w 4010 schematic marshall jcm800 artist 30w.
Kt66 and two 50w output transformers to handle the extra wattage. Free marshall diagrams, schematics, service manuals. For most of the guitar amps you can refer to the original manufacturer guitar amplifiers manual. Maybe a value here or there but essentially the same. The byoc classic brit 50 comes with the most complete, thorough, and easytofollow build instructions. Marshall jcm800 22032204 mods cautionary statement. Marshall schematics tube amp schematics el34 world. My version is a 1983 jcm800 4210 50 watt 1x12 combo with the 6550s. Your purchases help a youth music program get the gear they need to make music.
From what i can make out on the schematic it is a fixed presence with a resistor. Jmp or jcm800 discussion in amp central station started by johnnycrash, feb 10, 2007. Vintage marshall 1987 jcm800 50 watt guitar center. Probably the most important is it was designed and shipped with el34 instead of 6550s so if you like el34s this is the amp for you. Would be interesting to do that mod on an old jcm800 top that lies around here in rehearsal room. I think that this is the proper schematic for a 1980 jmp 50 watter. It came to me with an 80 watt wolverine speaker that sounded ok, but i did do some speaker swapping and ended up. My band is closer to loud than soft, and i usually run volume at 4.
My 50 watt marshall jcm800 model 2204 meh 42008 after reading many raves about the early 80s marshalls, and having already built a smallbox 50 watter, i finally succumbed and bought one. No pedals, no fx in the loop, just pure vintage amp tone. I play a 2203 since 25 years, bought it modded right from the beginning. Your marshall kit will make you a classic amp, and provide years of reliable service. For sale is my insanely clean 1983 marshall jcm 800 2204. Whats considered the best of the jcm800 50 watters. My companys reputation and longevity have been built on a great many things groundbreaking designs, skilled workmanship, reliability, flexibility, stylish looks and, above all else, great tone and feel. Filter choke marshall, for jcm800 antique electronic. I just fineshed my first tube amp marshall jcm 800 2204. Marshall 18 watt schematic marshall 2000 250w schematic marshall 2001 375w schematic. Ive had many people assume this was a reissue at first glance. The rugged build of this tube and reduced gain 30% less than a 12ax7 can improve headroom and give better control in high gain stages allowing users to more easily dial in sweet spots. Not many people actually use this feature as the sound in triode half power mode isnt as desirable as it is in pentode full power mode. These early 80s models with the vertical input jacks use printed circuit board pcb construction to hold most of the.
The amplifier was stolen from me and ive been collecting parts over the years to build my own version. An ecc82 was used as the driver tube for the four kt88s. Good condition with some cosmetic wear and modified by voodoo amps. The kit includes a high quality, handmade in usa turret board, mallory 150 series capacitors, high quality resistors, alpha potentiometers, knobs, belton sockets, cliff jacks, standard impedance switch, jewel style pilot light, fuse holder, power cord. Marshall diagrams, schematics and service manuals download for free. The essence of simplicity, the jcm800 is a onechannel, allvalve amp with no reverb or effects. This two channel version of the jcm800, gives you the flexibility of easily accessing great clean and gain tones, making it ideal for the stage. We have a huge schematics inventory, projects section and forum. Circuit simulation modeling vacuum tube guitar amplifiers using spice.
A dual triode that can be used in place of most 12ax7 circuits. When you are ready for a new set of tubes, learn the truth about biasing by clicking here. The ceriatone british style 2204 hw is our take on a timeless amplifier design first introduced in the 1970s. Amplifier jcm800 kerry king signature amplifier pdf manual download. Triode electronics jcm800 2204 50w layout shielded wires k d e c d k wn 0. We have added in a series fx loop, simple and effective. Cap set for marshall jcm800 2204, 4010, 4104 50w volume. Click the link above for tube amp info, schematics, board building information, projects, mods, transformer diagrams, photos, sound clips. To reflect this the jtm45 panels were changed to jtm50 panels. Discussion in andy sneap started by silverwulf, aug 30. The jcm800 model 2204 is generally classified as a 50watt amp. Diy jcm 800 2204 on jtm45 chassis metropoulos forum. The 2205 50 watt and 2210 100 watt amps were the first to feature marshalls diodeclipping circuit.
Guitar signal from the phase inverter enters at far left and flows to the power tube grids. The kit includes a high quality, handmade, turret board, mallory 150 series capacitors, high quality resistors, alpha potentiometers, knobs, belton sockets, cliff jacks, switch, fuse holder, power cord, the marshall style 100w power transformer, and output. Page 1 jcm800 2203 owners manual page 2 from the chairman i would like to personally thank you for selecting this reissue of my allvalve, jcm 800 2203, 100 watt, master volume head. You may want to consult your schematic to confirm that these are the correct values for your amp. Used by artists around the world, this amp continues to be one of our greatest. The 2204 hw 50w amplifier is based on the first master volume design in the british series, and became the tonal inspiration for some of the most coveted rock tones recorded. I have the ceriatone and i got some other 2203 schematics, too they seem to vary but im getting the idea. Marshall jcm800 splitch rev 50w 4210 schematic thetubestore. How to get classic marshall jcm800 tones using guitar modelling. Question concerning marshall jmp amps made in 1980. If you follow this recipe, you should have the ultimate jcm800. It is in very good shape for a twentyyearold guitar amp, and more importantly, it is dead stock i think even the fuses are original.
But if you want the jcm800 high power tube amp tone then you need one of those amps, though. Here is a demonstration of a 1981 marshall jcm 800 2204 50 watt amplifier. This is one of the holy grail early versions with the vertical inputs. By 1965 the 1960 cabinets were rated as having a maximum power handling of 75 watts. I have a 50 watt 800 modded by custom audio electronics cae that. Marshall tube amp schematics, hoffman amps tube amp schematic library. Avoid the jcm800 2203 and 2204 amps with horizontal inputs made after 1986.