#1
I will be so happy if someone can fix the problem, I sent it to an amp guy to get it repaired and he was clueless!

Basically, if i'm playing quite loud (such as live shows) then all of a sudden it'll go super 'gainy' and have so much reverb it's like the audience is floating through clouds.

This is really embarassing and the sound guys are always like, "what the **** are you doing?!".

It's a Marshall JCM2000 DSL401.

I changed the preamp valves, but the problem persists, i'm thinking it may be the power valves, but don't want to buy some and it turns out it's not the issue. Does anyone have any idea of my problem, it will make my day if someone can help me.

I'm too broke to buy a new amp, and I know this valve amp has a nice, warm sound.
#2
Maybe when the amp heats up some part in the reverb circuit expands and misbehaves.
#3
Quote by jpnyc
Maybe when the amp heats up some part in the reverb circuit expands and misbehaves.


There seems to be more distortion too, unless the circuit effects both of them.
#5
how old are the tubes? remember new is only a word.

You can just unplug the reverb tank and see if the issue stops completely or if the gain boost still happens. If the gain issue persists then I would suspect a preamp tube is going bad. but if it has been checked out, find a good tech in your area
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate
Last edited by Robbgnarly at Aug 16, 2015,
#6
Yeah what Rob said. Definitely try unplugging the reverb, I have had problems regarding reverb on amps in the past and it was a bitch trying to fix the issue, it'll be good to isolate that as the issue and know what you are in for.
I'm just a kickin' and a gougin' in the mud and the blood and the beer.
#8
Quote by diabolical
Unplug the verb like already suggested unless this one is digital and built in, at this price point I'm not sure as it might be.

It is a spring reverb tank
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate
#9
It's an op-amp driven spring reverb too. Sure it's not just the pot?
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#10
Your amp wants to play shoegaze.
Quote by Kozlic
Music doesnt need to be quality to be good.


Press eject, give me the tape, if you know what's good for you
#11
Sounds like a great feature. Other guitarists will be clamouring to copy you
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#12
Is that a tube reverb? If it is, I wouldn't just unplug the tank, the circuit needs to have a load.
"Practice doesn't make perfect. Perfect practice makes perfect." -some dude
#13
No, it's op-amp driven.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band