Looks pretty similar to most marshall schematics ive seen, maybe with the exception that preamp section shows the tube connections at the bottom of the page in order to declutter things. Marshall jcm900 dualrev 100w 4100 schematic ampwares. Heres my situationi know that the jcm 800 can get me the lead tones i want perfectly, but i hear that its cleans are soso. You dont see people trying to copy the jcm900 head or make a plugin of it. See mat garmans jtm451962 mod page for more information on modifying the jtm45 and 1962 reissues back to the original 60s jtm45 specs. View and download marshall amplification 4100 jcm900 h handbook online. 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. The thin sound comes from the transistors used in the 900 and the treble and presence design. Mojotone british 800 schematic mojotone british 800 wiring diagram. Jcm 900 valve 4100 dual reverb, jcm 900, 4100 dual reverb.
Jcm 900 higain master volume mkiii model 2100 chilltone. Pa systems, pa speakers, pa mixers, powers amp, crossover, microphones, wireless equipment. A dual triode that can be used in place of most 12ax7 circuits. They dont help in the sound deptartment, but certainly help marshalls bottom line. Triode electronics jcm800 2203 100w layout shielded wires 0. You will require adobe acrobat pdf reader to view these schematics. Marshall jcm 800 guitar amplifiers for sale in stock ebay. Marshall schematics tube amp schematics el34 world. Marshall jcm900 4100 marshall jcm900 4100 retrorod. Marshall jcm 900 model 4101 100watt hi gain dual reverb. User manuals, guides and specifications for your marshall amplification jcm 900 amplifier. Mode c gives high gain drive similar to the jcm 900 master volume amps. 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.
A detailed video of the jcm900 or similar biasing process. 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. These amps typically have undersized output transformers, and a resistor instead of a choke. The nineties 1990 1999 was the era of the jcm900s and the reissues. Look at the two schematics, and notice the lack of ics in the 21xx25xx circuits, compared to the 41xx45xx circuits. Marshall jcm 2000 dsl100 100w amplifier schematic diagram. Apr 03, 2011 in this video, i walk through the retubing and biasing process of my jcm 900. Jcm 900 valve series musical instrument amplifier pdf manual download. 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. Marshall you will find on this page the manuals and instructions for use for musical instruments, marshall pa equipment, studio, lighting and sound equipment. Copied and pasted from a thread on a different website discussion about jcm 900s. Mojotone reserves the right to change or substitute any and all of the parts contained in this amplifier kit without advertisement or notification to the buyer. Marshall amplification jcm 900 valve series handbook pdf. Marshall diagrams, schematics and service manuals download for free.
Apr 21, 2015 a detailed video of the jcm900 or similar biasing process. Tubes for the marshall triple super lead jcm 2000 tsl100. I also talk about my favorite tubes for this amp and why i chose them. Free marshall diagrams, schematics, service manuals. Tweed deluxe tweed champ blackface champ reverb unit tweed preamp tweed power amp 50 w tweed power amp 100 w. Jcm 900 valve 2100, jcm 900 valve 2500, jcm 900 valve 4100, jcm 900 valve 4101, jcm 900. 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. 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. Oct 06, 20 the preamp looks similar to a jcm 800 22032204 preamp with some clipping diodes stuck in it but there are some parts value changes and a bit of hifi fanciness with the first gain pot. 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 value of r17 is different on the 2 versions of the schematic for the power amp.
In 2015 we brought back a reissue by popular demand with all the features and styling of the original. See the marshall amps 1962 page for more information on this amp. Electro harmonix replacement tubes kit for the marshall 900 series all models that shipped with el34 tubes. I am replacing the old el34s with some kt77s i bought from eurotubes. In this video, i walk through the retubing and biasing process of my jcm 900.
An amp built to go on the road and be on the stage with a sound loud enough to fill stadiums. Marshall tube amp schematics, hoffman amps tube amp schematic library. Good tool for troubleshooting and repairthis diagram is in form of electronic file, pdf format, black and white, 7 pages, size 0. The pots are definitely labeled in this one though. Marshall jcm900 dualrev 100w 4100 service manual download. Marshall jvm410 service manual download, schematics. Nothing perks up the tired looks of a roadworthy marshall like a. The screw heads in this package have a slight oval shape, as opposed to many marshall head back panel screws. Fits most all large marshall heads, from the jvm and jtm series from the 60s through the jcm800, jcm900, jcm2000 and jvm series.
Replacing tubes and biasing a marshall jcm 900 youtube. Pdf file icon marshall jcm 900 50w poweramp schematic 79 kb. Marshall jcm 2000 dsl100 amplifier circuit diagram contains electronic diagram and parts values. Designed for the knurled splitshaft potentiometers. 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. The power amp is pure marshall valve but the preamp is certainly hybrid. Marshall amplification jcm 900 manuals and user guides. One schematic is dated 1990 it covers the both the 4100 and the 2100 master volume mk iii.
The 900 was marketed to shredders who modified the 800s to get more gain. Database contains 1 marshall amplification jcm 900 manuals available for free online viewing or downloading in pdf. A stylish reissue, the jcm900 4100 tm is the evolution of the jcm800 adding another channel, two reverb options and two gain features. They have 8 knobs, two preamp gains which are always on, and two master volumes which are switchable via footswitch. 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. Functionally, i think theyre a great amp if you like a single tone and want to stomp on a switch. Marshall was 25 years old and jim marshall had spent 50 years in the music industry. 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.
Set of 4 screws, stainless steel, 1 12 long, phillips, oval head, with matching cup washers. Tweed deluxe tweed champ blackface champ reverb unit. The awardwinning uba is trusted and used the world over uba has the acceptance, speed and security that you and your customers demand. Since 1962, the marshall company has crafted music amplification equipment.
Marshall overdrive has always set the standard, constantly pushing back the barriers that constrain creativity. The 900 is not a bad amp, but the 800 is the classic marshall for a reason. These amps are an interesting transition model between the jcm800s and the later jcm900 slx. 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. Marshall jcm 900 model 4101 100watt hi gain dual reverb 1x12 combo. Some of the parts contained in this kit are subject to availability. This two channel dual reverb 100w powerhouse will make you stand out on stage. To celebrate with you, we released the silver jubilee available for that year only. Copied and pasted from a thread on a different website discussion about jcm 900 s. Actually, all jcm series, 800s and the 900s, have transistors in the distortion section. Marshall amp heaven schematics jtm45 jcm50 jcm600 jcm. This allows you to play with that distinctive marshall tone but with the versatility of multiple amps in one.
View and download marshall amplification jcm 900 valve series handbook online. Marshall amplification 4100 jcm900 h handbook pdf download. To open downloaded files you need acrobat reader or similar pdf reader program. It introduced its jcm 800 series in march 1981, ushering in a new guitar amp line to replace those created in partnership with rosemorris. There are also some parts value changes in the pi and nfb. Actually, all jcm series, 800s and the 900 s, have transistors in the distortion section. R17 is part of negative feedback signal the mk had more neg feedback. Marshall jcm900 dualrev 100w 4100 schematic marshall. Jtm50, jtm100, major series, 18 watt, 20 watt, jmp, artiste, jcm2000, ibs, mini stack, 25th anniversary, silver jubilee, 2000, 9000, jcm800, jcm900. This is from a guy not me who is an absolute genius with marshalls, he builds his own 18 watt clones from scratch.