Marshall JCM 900 Hi Gain Master Volume

100W Head (4 x 4")

Made by Marshall

Description This amp is an all tube 100/50 watt head with a 4x12 1960 marshall cab. it is very similar to the JCM 800 except that the preamp is capable of much more gain.
Posted By Chris Joyner (39)
Directory Equipment: Amplifiers
Rate/Review This Resource
Overall Rating: 4.8 (of 5)
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From 5 votes total

Member Reviews


On 1/25/2008, Leonardo Sanchez (12) posted:
Overall Rating:
A new one of these amps must be incredible, mine is used and pretty beat-up but it still sounds very very very good. Great Tone, VERY LOUD, great WARM Overdrive.
Price: $450.00
Where Obtained: Second Hand
Features:
All Tube, 100W... once again this thing is loud!
Sound Quality:
I use a Epi LP 100, Play Blues and Rock. For blues it gives a great warm tone, while for rock, on a high volume, it has a great overdriven sound which is responsive to how hard or soft your playing. No Noise. Is it Clean At High Volumes? Very, actaully it's even cleaner at high volumes.... well actually i haven't tried the highest volumes cause I'd probably blow my brains out but, it's clean. The overdriven sound is very warm and responsive to your playing.
Ease of Use:
Easy
Durability:
I've played it live on many gigs using a set of mediocre valves, I haven't had any problems with it yet. The amp is very tough but it's also very heavy so be cautious.... mostly with the knobs.
On 5/20/2002, Inactive Member posted:
Overall Rating:
Damn good. i don't want another amp, ever. if this amp was stolen i would get the head version and buy a cab, a little thin with out the 4x12's but that is ok. oh yeah it is a beastly tank
Price: $700.00
Where Obtained: McKenzie River Music
Features:
It has 4 eq controls:low, mid, high, pressence 2 gain controls, 2 volume controls, and 2 reverb controls. back of it has FX loop with signal gain, direct out and recording line out and normal amp stuff. channel switching with switching for the reverbs. 100 watts of all tube power, can't beat that. 2x12 combo.
Sound Quality:
I use a kh503 loaded with emgs then a dime sign. wah then a ibanez dual chorus and a tubesreamer. this is a metal or rock amp. with the tubescreamer it screams. clean is pretty good i like it. at higher volumes you need to lay down on the gain for the clean or it gets overdriven. no noise, silent. awesome distortion with the tubesreamer.
Ease of Use:
It has knobs and not many can't be to hard
Durability:
This thing is a damn tank. it is has seen it's share of bar use and other abusive situations but screams give it to me harder.
On 6/13/2001, Gary Williams (75) posted:
Overall Rating:
Well I've been playing for about 17 years I beleive. Basically I've been aruond. Marshall was the choice 4 me.I would replace it if it was stolen or lost.The only way this amp could be better if it was bigger! The worst thing is my house does'nt have the right sound "headroom"It Kicks my a-- DAILY!
Price: $1100.00 (new)
Where Obtained: Apple music Port. Or
Features:
Its The real Thing !!
Sound Quality:
AXG1 Hyperperformace processer sfx Jackson dnk. 2 duncan driven,24 frets Ibeneze rg 24 frets w/v6,v7,v8 pickups,
Ease of Use:
Very easy!
Durability:
Of course!
On 11/19/2000, Ken Houglin (6) posted:
Overall Rating:
I am very happy with the sound and workability of this amp would like to place a mesa boogie right next to it!
Model Year: 1999
Price: $848.00 (new)
Where Obtained: MARS
Features:
Excellent gain qualities. Strong overdrive qualities.Channel switching between clean and dirty is seamless and immediate.
Sound Quality:
The guitars I use are a early eighties B C Rich w/neck thru body and EMG/BARTOLINI pickups. 2000 LesPaul standard. Acoustic 2000 TACOMA single cutaway.Effects processor BOSS GT-5.
Ease of Use:
Some tweaking required between guitars occassionally.
Durability:
Reliability as far as the head is concerned seems to be fine. this is the first all tube i have owned it does seem to me to go through tubes a little quick.
On 6/30/2000, Chris Joyner (39) posted:
Overall Rating:
Marshall built one helluva amp when they built this one, the bells and whistles that it has, though they are few, will best suit the really heavy player who wants to be deaf by the time he's 30.
Model Year: 1996
Price: $450.00 (new)
Where Obtained: Music Connection
Features:
This amp has your standard High, Low, and Mid EQs, but the the one that has biggest impact on your sound is the presence knob. This is about a 3-4khz boost/cut of about 20db either way. The infamous 11-20 gain knob on this amp only adjusts how hot the signal is before the preamp tube distorts it. It can make up for weak pickups, but other than that this is a useless device and can only result in alot of mud for Les Paul users. It should be mentioned that this amp has no effects at all, but does provide a second Master Volume channel so you can switch between two overall loudnesses. An effects loop in the back is really the best way to go as this is after the preamp section to capture those sweet tube tones.
Sound Quality:
Like most Marshalls, this amp sounds best up really loud so those EL-34s can really take over. I use the effects loop for my gain and everything else, and that makes for an earthshaking sound. On the back there is a high-low power switch. This switches the amp from its original 50 watt triode configuration to a 100 watt pentode configuration. Overall low power sounds better but the extra 5db or so comes in handy when I feel destructive.
Ease of Use:
I haven't moved more than one knob on this amp in 2 years, if that tells you anything. Once you find your sound, keep it. You may never get it back. Also, this head weighs more than I did when I was 10 years old.
Durability:
The EL-34s that came with this amp took about 10 hours to burn in good, and their sound hasn't changed in 3 years through over 1000 hours of really loud jamming with my band. I must say though that the bridge in this amp,(changes AC to DC) was really cheaped out on. It blew after about 700 hours.