It sounds great, though there is some cosmetic damage to the tolex and the speaker cloth. The conclusion in general is to buy a new motherboard from marshall. Scott todd demoing the marshall jcm900 12 stack with a string of classic rock riffs. Marshall has now become a household name throughout the world as a symbol of precision acoustic engineering, to be relied on, not only for superlative sound quality, but for high performance night after night. The lack of bottom end in the newer marshall amps jcm 900s and the jcm 2000s dsltsl come to mind really kill the overall sound of the amps. Marshall jcm 900 mkiii 2501 50 watt combo 1991 reverb.
Shame on me, but have been taking my amp to technicians to replace the tubes and bias it all these years but have never found one that i could trust knew what he was doing. Nothing perks up the tired looks of a roadworthy marshall like a. Cookies are small text files placed on your computer to collect standard internet log information and visitor behaviour information. With most valve amplifiers, particularly marshalls, the best sounds are achieved when the master v olumes are set high enough to be utilising the driving power of the output valves to the full. That is why many people still used distortion and overdrive pedals with that amp. Sounds amazing head is 100 watts with switch to change to 50 watts.
Marshall jcm900 dualrev 100w 4100 schematic ampwares. Id like to put the 2x12 on top of the 4x12 and have all 6 speakers firing. The marshall models jcm 900 mkiii high gain master volume series were made for only two years 9092, more rare then the dual reverb models. Call us about the marshall amps or guitar lessons at 2567663012. As it had 2k2 4w resistors r34 which looked to me as though they had never been solderedunsoldered since new, and other resistors are as the schematic for el34as, i would say yes it is standard el34a model. Try for others like peawy, the mesa and other jcm 900 is really the height, if you like big fat are well and that we love against less acute submitted too, the jcm 900 and jmp 1 are unstoppable. In the 1990s, marshall unveiled the jcm900 series amplifiers, featuring more distortion and retaining popular aspects of the late jcm800 models. The marshall jcm600 is an alltube, 60watt amplifier that gives you the classic marshall sound, but comes stacked with all the features of a modern amplifier. I have changed out the tubes, and the problem still persists. Introduced in 1974, the master volume lead series amps were marshalls first true high gain amplifiers. Reverb does not work but all else is great therefore really good price. Though they share common ancestry and have similar rear panel functions their.
Jcm 900 or jcm 800 like early rise against strike anywhere have heart or propagandhi. Although the jcm 800 had great tone like the plexi, it lacked the needed breakup for metal, neo classical rock, fusion and other heavy styles. All of these pdf files are available for free download. Although not quite the same tone, the amp was just as good for stage use without mods. Service manuals, schematics, eproms for electrical technicians. The ltp in the fender 5f6a bassman is identical to the marshall plexi, 2204 and jcm800 amps except marshall adds an additional 4. An amp built to go on the road and be on the stage with a sound loud enough to fill stadiums. Its the rarer el34 version of the already hard to find slx model so i couldnt resist it. Jcm600 series 6000102 rev chanswitch 60w jcm2000 series dsl50 50w dsl100 100w dsl201 20w dsl401 40w tsl6060102 60w tsl10022 100w vba400 series bass 400w 90s reissues 1959x super lead plexi 1st 100w 1959slp 2nd 100w 1962 bluesbreaker tremolo 45w 1987x superlead plexi 50w 2203 jcm800 100w valvestate mki series 80018010 v10. Your marshall kit will make you a classic amp, and provide years of reliable service. With most valve amplifiers, particularly marshalls, the best sounds are achieved when the master volumes are set high enough to be utilising the driving power of the output valves to the full. This allows you to play with that distinctive marshall tone but with the versatility of multiple amps in one.
There are several posts on the marshallforum about this problem. Converting 5 terminal powerswitch to 4 terminal 23. It manages to do everything an amp should ever do without the need to over complicate things. Marshall jcm 900 ibanez ts9 tube screamer and electro harmonics lpb1. These amps typically have undersized output transformers, and a resistor instead of a choke. Here you will find our collection of marshall schematics. Some of the older amps have an inspection sticker on the top of the chassis and they usually have the day, month and year the amp was made or inspected. It sounds really metal, trs big sound and the jcm 900 trs filled out its role of power amp he is strong, too even, but its role aprs all. After a few minutes of playing, it fades out then fades back in. If you look at the upper left hand side of the schematic, you can see 6 triangular shaped items, those are op amps. Actually, all jcm series, 800s and the 900 s, have transistors in the distortion section. Marshall schematics tube amp schematics el34 world.
Found on a variety of marshall amps, including most jcm800, jcm900, jtm30 series, jtm60 series, jcm600 series, 9001 and 9004 preamp, the early valvestate models 8010, 8020, 8040, 8080, 8100, 8200, 8240, 8280 and the earlier mg series versions as well as other models. Like i said, just switch them with a set of el34s, use a marshall 4. For the past two decades, one name has been synonymous with the best in rock amplification. Marshall jcm900 dualrev 100w 4100 schematic marshall jcm900 dualrev 50w 4500 schematic. The marshall 1960a produces a loud, wellfocused, and uncluttered sound with a tight, full low end and a crisp, bright top. They dont help in the sound deptartment, but certainly help marshalls bottom line. I like the jcm 900 s tone a lot when turned up classic 80s hard rock tone, but the jcm 2000 has better cleans and is much more versatile. The jcm 900 models split into two distinct product ranges, the master volume slx and the dual reverb. They cascaded the plexis bright channel into the normal channel, added a prephase inverter master volume and cold biased cold clipper gain stage and.
Do you have a marshall guitar or bass tube amp that needs repair or modifications. This was the combo version of the 2098 master lead head. Question another question about ohms marshall jcm 900. Mine is the 4100 100w model el34a tubes pin 18 are tied. 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. What is the proper safest ohm setting for the combo and the cab. Marshall jcm900 4100 hi gain dual reverb september, 2012 november 30, 2017 steve 2 comments.
Over the past few months, my 50 watt jcm900 tube amp has started fine. For sale one marshall jcm 900 50w mkiii high gain combo guitar amp model 2501with stock speaker celestion g12h100. The jcm 900 doesnt have that striking touch of the jcm 800, but it has inherited a very respectable sound, with a lot of versatility, thanks to its two channels the jcm 800 has a single channel and even if you know how to handle the volume control, its hard to toggle between clean and distortion. Cosmetically in excellent condition very clean, look at the photos for reference of condition. I have a marshall jcm 900 2x12, and i just scored a 1960 cab from a pawn shop. Infos sur tete dampli guitare marshall jcm900 4100. Marshall amp heaven schematics jtm45 jcm50 jcm600 jcm. Jun 06, 2017 released in january 1990, the jcm900 boasted higher gain and lower noise coupled with the classic marshall tone. Actually, all jcm series, 800s and the 900s, have transistors in the distortion section. That was the problem with the plexi it needed to be at high volumes unusable unless in a large venue to get the needed breakup and tone.
This site helps you to save the earth from electronic waste. I think it gives it character, and you wont have to worry about giving it its first ding. See mat garmans jtm451962 mod page for more information on modifying the jtm45 and 1962 reissues back to the original 60s jtm45 specs. The series was originally comprised of the single channel higain master volume mk iii and the two channel higain dual reverb. To open downloaded files you need acrobat reader or similar pdf reader program. The 900 was marketed to shredders who modified the 800s to get more gain.
Marshall date codes early marshall through the jcm800 series. A stylish reissue, the jcm900 4100 tm is the evolution of the jcm800 adding another channel, two reverb options and two gain features. No, were not quoting the famous 70s disco track by andrea true. This was the dual channel high gain amplifier after the jcm 800. Diy build or rebuild kit for a marshall jcm800 2204a. Marshall diagrams, schematics and service manuals download for free. Mar 03, 2020 the entire reason why jcm series amps even exist is because marshall has decided to change things and defy the mainstream. View and download marshall amplification jcm 900 valve series handbook online. In germany for example the marshall distributor wants 200 euros for that. If this ad is up on the site, the amp is still available. How the marshall plexi, 2204 and jcm800 amplifiers work.
The voltages are calculated values, not measured values, as described below. This might be easy and affordable in the uk, but not in other countries in the world. Jcm900 series 21 mastervol 100w 25000102 mastervol 50w 4102 dualreverb 100w 45000102 dualreverb 50w jtm 900 slx series 21 slx 100w 25000102 slx 50w 30th anniversary 61 100w 61 le 100w jmp1 series 6100 100w dbs series 7200 200w 72115 200w 72410 200w 7400 400w jtm30 series 210310 30w jtm60 series jtm600 60w. Marshall jcm900 schematic power amp el34 free download as pdf file. I have an electronic background so i know just enough to be dangerous. Component numbers on the schematic and layout match.
The jcm900 combo is basically a 100 watt twin 12 inch speaker combo and is a true marshall stack in a matchbox. I found that if i throw the clean channel on ten and bring the preamp gain to about 2. Jcm 900 head cab not included good shape and works great. Ive got a jcm 900 and have also used a jcm 2000 extensively tsl model. The 3450345 volt rms power transformer creates 488vdc if there is no load or rectifier loss. Marshall jcm900 dualrev 50w 4500 schematic thetubestore. Marshall amplification jcm 900 valve series handbook pdf. If we assume 5percent sag and less than 5vdc loss across the output transformer primary, then we get about 460v at the el34 plates. Excellent for players who dont want to muddyup their effects. The birth of the high gain amplifier 2203 master volume 100 watt, 2204 50 watt and jcm800 lead series preamp.
Long story short, the 900 4100 is a beasts beast, and sounds just as good as any 800. Marshall tube amp schematics, hoffman amps tube amp schematic library. Jcm 900 valve series musical instrument amplifier pdf manual download. The jcm has a switch to go between 8 ohms and 4 ohms. See the marshall amps 1962 page for more information on this amp. If i were to choose between these two id go for the 2000 unless i was going for an 80s specific tone and the 900 was a lot cheaper. Pdf file icon marshall jcm900 2100slx 2500slx 100w preamp schematic diagram 307 kb. Free marshall diagrams, schematics, service manuals. Only difference is the 800 came with english made power tubes rather than the cheap chinese ones with the cheap glass.
The marshall jcm 900 is a guitar amplifier featuring a 100watt alltube design, 2 channels and a shared 4band eq. Somewhere in there one is at the top you can find vr1 and vr2 indicated with a small dot. I like the jcm 900s tone a lot when turned up classic 80s hard rock tone, but the jcm 2000 has better cleans and is much more versatile. Marshall jcm 900 alltube combo guitar amplifier for sale. Jcm 900 series 21 mastervol 100w 25000102 mastervol 50w 4102 dualreverb 100w 45000102 dualreverb 50w jtm 900 slx series 21 slx 100w 25000102 slx 50w 30th anniversary 61 100w 61 le 100w jmp1 series 6100 100w dbs series 7200 200w 72115 200w 72410 200w 7400 400w jtm30 series 210310 30w jtm60 series jtm600 60w. When new these amps supplied in two variants, with one having 4x el34s in the output and the other variant having slightly lower power with 4x 5881s. Marshall jcm800 2204a 50w tube diy amp kit version 1. Marshall jcm 900 2501 50w hi gain master volume mkiii. Jcm 900 valve 2100, jcm 900 valve 2500, jcm 900 valve 4100, jcm 900 valve 4101, jcm 900. Marshall jcm900 dualrev 100w 4100 service manual download. The nineties 1990 1999 was the era of the jcm900s and the reissues.
Basically my 900 sounds good dirty, but it feels very dull on the strings, without punch. Jcm 900 valve 4100 dual reverb, jcm 900, 4100 dual reverb. The jcm 900 range use high quality 5881 output valves x2 in 50 watt models, x4 in 100 watt models for their unique distortion properties and fluid tone. View and download marshall amplification 4100 jcm900 h handbook online. Jun 24, 2015 marshall jcm 900 ibanez ts9 tube screamer and electro harmonics lpb1. July of 1969 marshall introduced the date coding system.
Marshall jcm900 21xx 25xx 100w schematic marshall jcm900 25xx 45xx 50w schematic. Jcm 900 50w bias question issue musicians roadhouse. Marshall amplification 4100 jcm900 h handbook pdf download. Marshall jcm 900 lead series model 1936 2x12 cabinet reverb.
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