There are some minor differences between there lay out and the actual schematic. This amp used the 1987 tremolo chassis in a 4x10 combo cabinet. This amp used the 1986 bass tremolo chassis in a 2x12 combo cabinet. I have a marshall jcm 900 2x12, and i just scored a 1960 cab from a pawn shop. The clean channel dimed sounded great, but the lead channel was useless without an eq pedal in front of it to give it some low end. Marshall tube amp schematics, hoffman amps tube amp schematic library.
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. Basically my 900 sounds good dirty, but it feels very dull on the strings, without punch. Combo versions of the amps always had a special code attributed to them for example, the combo version of the jmp 2204 was the 2104. My 50w marshall jcm900 combo seems to be having bias issues. Two fuses are used in the high voltage plate supply for this amp, which is a nice touch and will add. Carter and features exclusive interviews with the greatest names in music. Marshall jcm 900 100w dual reverb combo best offer very good. Ive got a jcm 900 and have also used a jcm 2000 extensively tsl model. 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. He made some mods, but i dont know how it turned out.
Marshall mr 4100 jcm 900, 2 kanal topteil, dual reverb, 100 watt, reverb. If this ad is up on the site, the amp is still available. I found that if i throw the clean channel on ten and bring the preamp gain to about 2. You dont see people trying to copy the jcm900 head or make a plugin of it. User manuals, marshall amplification amplifier operating guides and service manuals. Marshall jcm 900 model 4102 100watt hi gain dual reverb 2x12. The awardwinning uba is trusted and used the world over uba has the acceptance, speed and security that you and your customers demand. There are relatively few settings and it is regrettable that the qualiseur is common to both channels a reverb plutt indpendante. Solve marshall jcm 900 valve 4100 dual reverb problem. Tubes free delivery possible on eligible purchases. Valve output power 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.
The jcm has a switch to go between 8 ohms and 4 ohms. Straightened out some issues on this old 1990 jcm 900 50 watt 2500 head. Marshall dsl100hr 100w tube guitar amp head guitar center. I cant find any mistakes with my wiring, no shorts etc. Find great deals on ebay for marshall jcm 800 combo and marshall jcm 900 combo. View and download marshall amplification jcm 900 valve series handbook online. A stylish reissue, the jcm900 4100 tm is the evolution of the jcm800 adding another channel, two reverb options and two gain features. This version of the marshall jcm900 includes a series effects loop with true bypass operation perfect for gigging musicians. Bring legendary marshall tone to your rig with the jcm900 4100 guitar amplifier head.
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. The addition of a s at the end of the code refers to a smaller version of the head, made to fit with a 4x10 cab this only aplies to the 2204s head from the jcm series. All tubes including the preamp tubes have been replaced recently with no improvement in the clean sound. An ecc82 was used as the driver tube for the four kt88s. The amp will be a class a type, using possibly two or four output transistors, or could use ic modules or even valves see if you amp is listed here for schematics marshall amp heaven schematics jtm45 jcm50 jcm600 jcm900 jcm2000. Then i replaced the tubes and those magical cleans went away.
The thin sound comes from the transistors used in the 900 and the treble and presence design. It blew the pico fuse and harmed the effects loop to boot. Marshall jcm 900 2501 50w hi gain master volume mkiii. I purchased a jcm 800 2203 from triode electronics. I recently picked up a splawn quick rod, which is supposed to be modeled after the jcm800 but in a bit more of a boutique head. Marshall amp heaven schematics jtm45 jcm50 jcm600 jcm.
Marshall jcm 900 mkiii 2501 50 watt combo 1991 reverb. Jcm 900 valve 2100, jcm 900 valve 2500, jcm 900 valve 4100, jcm 900 valve 4101, jcm 900. Only difference is the 800 came with english made power tubes rather than the cheap chinese ones with the cheap glass. Question another question about ohms marshall jcm 900. Marshall jcm 900 model 4102 100watt hi gain dual reverb. Can someone take a look at them and give me an idea if he was on the right track. Actually, all jcm series, 800s and the 900s, have transistors in the distortion section. Marshall jcm900 alltube combo guitar amplifier for sale. The 900 is not a bad amp, but the 800 is the classic marshall for a reason. For sale one marshall jcm 900 50w mkiii high gain combo guitar amp model 2501with stock speaker celestion g12h100. Id like to put the 2x12 on top of the 4x12 and have all 6 speakers firing.
Keep your profits flowing with ubas patented removable stacker mechanism, powerful sensing and antistringing technology, and your customers happy with ubas automatic retry feature, selfcentering mechanism and faster drops with icb cash. Sep 20, 2010 the amp will be a class a type, using possibly two or four output transistors, or could use ic modules or even valves see if you amp is listed here for schematics marshall amp heaven schematics jtm45 jcm 50 jcm 600 jcm 900 jcm 2000 jtm100 jmp ibs jubilee valvestate bluesbreaker. Prowess amplifiers marshall schematics jcm 800 2203. Get the marshall jcm2000 triple super lead 100 head if you want an amp with great clean sound and a lot of gain. Opinions on marshall jcm 900 dual reverb 2x12 combo. Marshall jcm900 4502 2x12 combo metal mod discontinued we no longer modify these amplifiers. What is the proper safest ohm setting for the combo and the cab.
I have never used the fx loop until i tried for the first time last night to run my new small clone analog chorus and digital delay it didnt work for some strange reason all i could hear was a very faint saturated tone barely audible so i put the. The best clean channel in a jcm 900, or just about any marshall, in my opinion, comes from the jcm 900 dual reverbs 4100 and 4500. Marshall jcm900 dualrev 100w 4100 schematic marshall jcm900. Various factory issues have proven time consuming to resolverepair. Marshall jcm 900s and 2000s why are these never emulated. Jcm 900 valve series musical instrument amplifier pdf manual download. With dual channels, a shared 4band eq, and 100 watts of alltube power, youve got an amp that is ready for any gig on any stage. In the 1990s, marshall updated its product line again with the jcm900 series. Jcm900 series 21 mastervol 100w 25000102 mastervol 50w 4102 dualreverb 100w 45000102 dualreverb 50w jtm900 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 5010 ss amp can it be modded to a fendery sound.
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. Marshall amplification is a british company that designs and manufactures music amplifiers. Marshall avt50 guitar amp repair electronics forum. Marshall amp schematics to assist you with your amplifier repairs and modifications. I own a 5881 4102 combo, but aint no way i can make it sound like that. From sparkling clean to fullblown marshall roar, this allvalve 100w head delivers it all. On the left is the preamp circuit board containing the input jack, tone controls, and signal switching. There is a couple schematics on my website from a guy that sent them to me. Marshall jcm900 4100 100watt 2channel tube head sweetwater. Having three independent channels clean, crunch, and lead puts amazing control, flexibility, and tone variations at your fingertips. 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. Marshall jcm2000 triple super lead 100 head musicians friend.
Free marshall diagrams, schematics, service manuals. Marshall jcm 900 2501 50w hi gain master volume mkiii ampwares. At one point it was no kidding on fire and in pieces. My main amp for about 20 years was a jcm 900 100watt combo. Marshall schematics tube amp schematics el34 world. Jcm800, jcm900, 6100, slash afd, kerry king, yjm, silver jubilee 2550 duration. Buy jj tube upgrade kit for marshall jcm900 4100, 4101, 4102 amps 6l6gc ecc83s. This two channel dual reverb 100w powerhouse will make you stand out on stage.
He blew a transformer as a kid after redplatting and burning up a lot of components. Actually, all jcm series, 800s and the 900 s, have transistors in the distortion section. Like i said, just switch them with a set of el34s, use a marshall 4. Marshall amplification jcm 900 valve series handbook pdf. Episode 1 is available now and kicks off with the guitar legend himself slash. Marshall 2x12 cab model 1936 wiring help please marshall jmp 50w ii help please best way to ship a marshall halfstack. Long story short, the 900 4100 is a beasts beast, and sounds just as good as any 800. Marshall amplification amplifier user manuals download. Since so many of these are in service by players and not sitting in collectors closets, i think this amp will be continue to rise in value and be a treasure for years to come. The 900 was marketed to shredders who modified the 800s to get more gain.
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. Ive replaced the power tubes once with russian made electroharmonix and again with groove tubes i bought the amp second hand with. This wonderful old marshall jcm900 lives in a recording studio. The marshall dsl100hr 100w tube guitar amp head delivers the iconic dsl tone thats driven rock and metal for decades, and adds modern. Download 365 marshall amplification amplifier pdf manuals. An amp built to go on the road and be on the stage with a sound loud enough to fill stadiums. When we played reading and leeds, jim marshalls son was there and i told him how much i loved my jcm 2000 dsl 100. The nineties 1990 1999 was the era of the jcm900s and the reissues. Including the 2245, 1959, jcm800 and many more additions to the series.