Marshall JCM 900 4100 Dual Reverb

This amp has a 3-band eq with presence and reverb. Honestly I think the reverb is a little weak. I have to turn it all the way up to get the sound I desire, but that's just me. Also I have to crank the pre-amp gain on the clean to get it loud enough so that there is a clean balance switching between clean and dirty. It has your basic fx loop and slave outputs.

The sound quality is awesome for rock, blues, or metal. The clean is nice but the pre-amp gain has to be turned up to almost 8 for volume with out it breaking up too much. The overdrive is just awesome though, this is a true rocker's amplifier.

When I bought the amp it was broken, probably because of shipping. After it was fixed it worked really good. It needed a new reverb tank and some other things so maybe this is why the reverb is weak. Other than that it has never let me down in the year that I have had it.

Never had to contact.

I like it because i got a good quality amp for a pretty meager price ($400). If I had the money though, I would get something else.

3 band EQ
2 Channel - Clean and Dirty
Presence control
Dual Reverb

Wish it had separate EQ and volumes.

I have played all types of Rock and Roll, Metal and Blues.
This Amp is amazing. It's never been moded, Tho I have been trying to figure out a way to put 6550's in it. (Dont ever try it without consulting a pro... You will melt the power transformer!!)

Sounds best with Humbuckers or EMG's.

I have 3 guitars that play through it as of current:
97 American Fender Strat

SUPER MODIFIED Epiphone Gothic Explorer with Seymore Duncan CUSTOM CUSTOM Pick up

Ampeg Dan Armstrong Acrylic (Keith Richards, Joe Perry, Dave Grohl, Josh Homme)

LOVE THIS AMP.

I have had some fuse issues with the amp occasionally. But that was just due to a need for tube changes.

I gig with this amp non stop. And I will continue gigging with it until it dies.

MARSHALL FOR LIFE!

Never Needed.

I WILL USE THIS AMP FOREVER.

Marshall could just make this amp for the rest of time.

Made for the rock and nothing else. I love the straightforwardness of the design, as it seems the best amps do (Orange, Hiwatt, etc.). The only confusing knob is a "presence" button, and I still don't know what that thing does exactly. I find the Direct Recording out useful for running a tuner (not recording out of - come on people!).

This amp seems built like a muscle car - with a lot of useless horsepower. It's totally overbuilt for me, as I only use one channel and always use it at half power (and only turned up half way from there). Even at that setting, many a soundman has asked me to turn down, so that 100 watt feature is a waste. Maybe it's a macho thing.

I run it out of a 212 with Vintage 30s, as I sold the matching Marshall 1960a half stack I bought it with to a metal kid. What a difference in sound! That and my rig is now 50 pounds lighter. No matter how many speakers you have, the soundman only mics one. The rest you are senselessly lugging around. Again, maybe a macho thing?

This amp is for making that AC/DC style, straight up rock sound. You know, the sound of a thousand classic rock, southern rock, punk rock and hair metal bands. If you are looking for anything different or diverse, you will probably be disappointed. I am personally in love with that sound and this amp does it for me.

This thing worked great for years, but in the last six months it has failed on me twice. One of those was one of those tricky problems that happens here and there, with the volume cutting in and out. My tech told me that these "new" Marshalls tend to do this a lot, with random connections coming loose and other problems. Yow, that is scary.

I'm no amp afficionado like a lot of people on hear, judging amps as others judge types of wines ("full body," "nice vintage," "a little bit sweet"). I haven't tried a lot of amps, but I have been consistently in love with the tone of this one for years.

My JCM900 was build in the early 90's, it has al the things I need, A simple equalizer, 2channels with reverb and gain, and tons of power and rock 'n roll

Both channels are amazing and sound like they have to sound, the clean is very bright and you can drive it up with the preamp gain control of this channel up to some nice overdriven bluessound, the B lead channel is amazing too, because I like late 80's and early 90's rock and heavy metal, it has leadsounds up to m??torhead and stuff like that. Sometimes I use a distortion pedal if I want to play something more modern..

This amp never let me down, never broken down, I have the amp for about five years and I had never problems with the amp.

I've have been playing for a long time and probably the jcm900 was the deal of my life because i could get it very cheap with a 1960a cabinet. This amp is just completely rock 'n roll, excellent for gigging or just a jam with some friends.

Produced in 1991-92 and still has the original EL 34:s. Dual channels working very well, could have been even nicer with dual EQ:s, but it is not essential. The half power possibility is very handy. The fuse system seems practical, but i have never blown one.

The clean sound is OK, but can be a bit harsh at moderate levels. The distorted sounds are much better (no surprise). The clean channel produces a nice bluesy overdrive when pushed. The high gain (diode clipping) channel contains a more lead type sound with distortion and sustain. This is a little brighter, for making leads stick out which cold make it a little buzzy for accentuating other parts of a song. If you use moderate clipping and play very loud some really nice tones come out of that channel as well. It is a very, very loud amplifier and a 50W head should be more than enough and better for cranking the power amplifier. I have used it without effect pedals, but have recently tried a Marshall GV-2, to get three kinds of basic sounds and that works very well and sounds natural. I have been playing guitar for 36 years and I use both single coil and humbucker guitars.

No problems.

Can't say. I have never had any contact with Marshall.

I have used it for 12 years, bought it second hand and have never had the slightest problem with it. I've heard better plexis in a classical Marshall sense, but a lot of worse 800:s and this is far better than the new Vintage Modern i tried. The plexi I had before was a very good one trick pony if cranked, but this 900 has a wider sound spectrum.
This amplifier will become a classic in spite of the internet bashing and the excessive 800 cult. It is now reproduced by Marshall.

dual channel 100 watt
made in the 90's sometime
came factory with 6l6's
Modded eq section & change from 6l6 to el34's

This is a really nice amp after changing out preamp tubes to tung sol 12ax7's & converted the original 6l6 to el34's (svetlana)
Had the eq section modded & now it has a huge variation with tonal character...I love its range now...I play rock & roll so this is the perfect amp for me

I blew several sets of power tubes using a power soak & have since sold the power soak...No problems with the amp otherwise

? I hate customer support anywhere...they all suck regardless...even if they help you out , they still suck

Ive been around the block for a while & have tons of gear to fuck with...This amp is my nucleus...Im positive theres several jcm 800's that would give a left nut to sound like my modded 900 model...
Im in bliss now
I got this thing dirt cheap...best deal on anything I ever bought new or used...it needed retubed when I bought it & that was a cheap thing to take care of...Did I mention I got the 4x12 1960 cabinet with it as well?
BEST DEAL EVER ON ANYTHING...IM'A LUCKY FUCKER

Well enough said about the hardware features by others. My Amp is actually the 100watt combo with four 6L6 valves.
I sometimes use it as a head with a 4x12 standard Marshall Quad box to get that classic "Brown" Marshall Knock tone or otherwise on its own as a combo coz the open back sound is also very nice and versatile.
The main feature is that the JCM900 is a fabulous and tasty sounding Rock Amp that wont suck the tone of your instrument and will deliver that classic Fender single coil or Gibson humbucker sound whether in context of smokey jazz or overdriven tones ala Gary Moore etc.
Its getting harder but you may just jag one of these amps cheap on account of past criticism by those who must have presumably had faulty hardware or just those who have no clue anyway.
As mentioned by many many others - make no mistake - this amp is a classic and will be sought after for its classic benchmark Marshall tone.

This amp is a monster - a gorgeous capable and reliable one at that and will easily deliver those musical sounding classic rock or other desirable guitar tones die hard tone dogs would die for. Easily one of the best Marshalls ever made which wont allow other guitar players or other fellow musicians to intimidate or elbow you out of the stage with their sound at a gig and at the same time actually make you stand out as a guitarist and musician. Experiment with the effects loop that is to say the power amp "in" as mentioned by others and you will have a four channel amp with different sounds enabling you to harvest the sounds of most styles with ease - yes even speed metal. Also try the reduced power setting. You wont actually get much drop in volume but it does change the sound although both settings sound good. This Amp is a classic to those with good ears and fingers. A Tube Screamer or decent equivalent, Boss delay chorus and EQ thru the power amp in section will place you in Tone Heaven in less than a heart beat. I have owned this amp for nearly four years and I'm still in love with it.I'm in three bands - one does mainly Corporate shows and the occasional Pub gig doing a variety of popular music, another is a Jazz Combo and we work regular at a variety of venues and also a rock band doing a fair amount of our own originals or covers with our own arrangements.
My JCM900 is the only amp I found capable and versatile enough 2 cut all three different type of gigs.I have seen and heard others try to get the same vesatility by resorting to tone modeling pre-amps with their very identifyable imitation over-processed sounds that lack character and that exciting tone of a real amp. Well I also own a COSM Preamp but only use it to sketch guitar parts in my studio for recording which I eventually re-record with a mic in front of my amp.

Very dependable but just look after the valves and service every year if you work the amp hard and often (five nites a week in my case) and it wont leave you in the cold

Not ever needed so N/A

In the last 15 years since my first High SchoolBand I have owned many classic valve amps like other Marshalls, Fenders Boogie etc and non valve amps including the brilliant Roland JC120 and JC77 - actually still have the Rolands and in truth the JCM 900 is my fav Valve amp. My JCM 900 and the Rolands have the classic tones sought and heard in many contemporary and classic rock recordings.In fact friends of mine have hunted this model Marshall down after hearing and trying mine. Mine is the 6L6 valved model and I personally like it better than my friend's EL34 valved model as the 6L6 sounds smoother. I mainly use Strats, Tele Thinline and also have a Les Paul Custom I hardly use coz its so heavy and a Nighthawk I do use very often All my guitars sound good with their own hallmark sounds thru this tone monster amp

I've owned this amp with EL34's since 1994, and I have to say I love it. Has more than enough features. I play blues/rock (Clapton, Moore, Santana) and is great for this style. I gig with it regularly - it is very well made, what you'd expect from Marshall.

Clean sound is good, but nothing like a Fender sound. This amp's strong point is its distortion sound. When driven hard, its hard to beat... but it needs pushing. At low volumes the tone isn't great, but then again it's not designed for that! I always have it on half power and run it through a 2x12 cabinet which sounds very sweet..better in many ways than before when I had a 4x12 which needed higher volume to sound good. I play a strat with tappable humbuckers made by Evans which are wonderful pickups (sadly no longer made). In a nutshell, this amp sings, cries, sustains and kicks ass all depending on how you want it to sound.

Certainly, its very well made and solid.. in fact it can manage to play on if a tube blows. The clean channel gain pot needs replacement and can be a pain to set it right as it scratches the sound if not.

Never needed it.

Would be devasted if it were stolen and would certainly replace it - perhaps with a lower powered model. I love its looks and sound - I get many compliments after gigs.

1998 model with 5881 power tubes, changed to better sovtek tubes after few months or so.
Reverb is nice, adds extra presence and cut for soloing. Nice when used subtley on clean channel.
I thought having only two channels would be a downer as i was used to having a solo boost channel (previously had a TSL combo) but the sound cut right through such that i found i didnt need the extra channel. very impressed.

B channel is great a it allows for a massive range of sounds, all with a twist of the gain. A channel is great, awesome clean sound (up to 5 or 6 on the gain) and nice crunch for gain settings over 6ish. Even at gain levels over 6 pulling back on the guitar volume even from 10 to 9 will clean it up nicely.

I am currently using this with a marhsall 1960A cab although wouldnt mind trying out the 150W version with the vintage30s. Anyway using this with a fender strat with lace sensors (blue, silver, gold), Gibson LP Studio, Ibanez RG520QM and an epiphone gold top (took a lot of work to get it sounding good with out all the damn electronics issues that come with epiphones, it just looked so good and i couldnt afford the gibson version as most people can understand)

Distortion would be good for metal if kept at max and you were really pushing the power tubes but for me this is a ROCK amp! clean through to crunch through to awesome high gain dist!
good stuff all round.

Ive only had it a year but its got me through all my gigs so far hassle free! i never use a back up mainly cause i dont have another $2k.

I can compare it to the TSL and DSL combos, Valvestates & Fender hotrod (as i have owned all these) and i'd have to say this is the better of all of them, more flexible, dynamic and probably just better suited to my style. Range of sounds was better than i had expected and i cant see myself ever getting rid of it!

I just got a Marshall 1993 JCM 900 4100 with 5881's. I am writing this review because like most, I have been in search of that right sound. This amp is the most versatile amp out there. I have read many reviews under rating this amp and you guys are missing the boat. I will agree that you have to get the right version of this amp. I have owned 5 of these and did not like the EL-34 version or the 50 watt version as the 50 watter lacked bottom and the EL 34 version was not very smooth.

This amp can go from pretty clean with the 5881's to screaming all out rock. The clean channel with the 5881's is very clean at high volumes. It is not a Fender clean but does not distort if you keep the gain no higher than 5-6. My amp came with 6L6's which I immediately changed to Tung Sol 5881's and also changed the pre-amp to Tung Sol 12AX7's. This change changed my life. These are by far the best tubes to use in this amp. I have tried them all. I have been playing in bands and guitar for 30 years. I have all old Boss Japan timed effects running through the effects loop and a Keeley tube screamer in front for boost and light distortion on the clean channel. This is the most under rated Marshall. I have owened the TSL 60 which sucked, the DSL 50 which sucked, 1987X plexi which was cool but just to damn loud and again 4 other JCM 900's which sucked until I got the 5881/6L6 version.

These amps are simple but great.

No Comment.

I would never sell this gem.