tas38
UG's Michael Westen
Join date: Aug 2011
1,189 IQ
#1
Got a Crate V33 pretty cheap because it had good cleans and figured I could turn a profit regardless. Anyway, it has a problem on the distortion channel. I rarely use it, so I hadn't noticed it until recently, but I can't sell it until it is resolved. The distortion channel has a gain knob and a level knob that function in the standard way. However, the level knob does not work correctly. It might as well be a 3-way switch. Starting fully counter-clockwise, the amp is virtually silent (It becomes audible with the gain cranked). At about 8:00, there is a small jump in volume, to about tv-level. Then the volume stays exactly the same all the way until about 4:00. At that point, the volume jumps to ear-deafening levels, and stays the same volume the rest of the way.

I tried changing preamp tubes, made no difference. Didn't know where to go after that.
RG351DX - Bridge Dragonfire Screamer, Mid+Neck Fender Hot Noiseless
Peavey Valveking 112 - Eminence GB128
AMT E1 > Joyo AC Tone > Dan'o EQ > Shimverb > Digidelay
R45VT
Doesn't speak guitar
Join date: Dec 2009
1,110 IQ
#2
Does the knob feel funny when you turn it? Might be a bad pot.

Any other details?
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tas38
UG's Michael Westen
Join date: Aug 2011
1,189 IQ
#3
It feels perfectly fine when I turn the knob. I really don't know what else to say about it. Nothing else about the amp seems off.
RG351DX - Bridge Dragonfire Screamer, Mid+Neck Fender Hot Noiseless
Peavey Valveking 112 - Eminence GB128
AMT E1 > Joyo AC Tone > Dan'o EQ > Shimverb > Digidelay
Arby911
Finding the Pattern
Join date: Jul 2010
830 IQ
#4
Almost certainly a bad pot. I've got a V33 sitting in my guitar room and it works as one would expect.

Well, almost, it got loud far too fast so I changed out V1 for a 12au7 which moderated it significantly. It's far more usable across the range now.
“Ignorance more frequently begets confidence than does knowledge.”
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tas38
UG's Michael Westen
Join date: Aug 2011
1,189 IQ
#5
Yep, pretty sure you're right. Time to take it apart.
RG351DX - Bridge Dragonfire Screamer, Mid+Neck Fender Hot Noiseless
Peavey Valveking 112 - Eminence GB128
AMT E1 > Joyo AC Tone > Dan'o EQ > Shimverb > Digidelay