Gutch220
Join date: Dec 2002
1,758 IQ
#1
My amp has been flucuaing in volume from normal to nothing lately. It will play fine for a bit then act up for a few minutes then go back to normal a bit, etc..... the tubes are brand new, cables are good, cabinet is fine, there is no obvious/visible damaged components on the PCB, all solder joints seem good, there is no obvious external leaking of the caps.
What I'm looking for is people who have experienced this problem and have gotten it fixed.....what did the problem turn out to be? or any other opinions.
I bought new tubes and had a tech bias the amp and put them in. this was about 2-3 months ago..... The problem has been there before and after the new tubes were put in so I'm leaning away from the tubes scenario. My first instinct is caps or transformers but I want to hear what others have experienced. Its more of a random flucuation rather then a steady cycle
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WANTED: Univox 8x10" Cabinet
SinnaSatan
Get Ya Pull ofa That Shît
Join date: Jul 2005
595 IQ
#2
Are you sure it's your amp and not your guitar? Cause I had a similar prob. with my old guitar. The volume pot was broken, so every now and then the volume became low and then suddenly high again. This happened usually when the volume was at 10. Turning it a little down eliminated the problem.
Electrics:ˑˑˑˑˑˑˑˑˑˑˑˑˑˑAmps:
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Gutch220
Join date: Dec 2002
1,758 IQ
#3
I tried a different guitar on the amp and the same problem was still there.......then I tried those two guitars on a different amplifier and there was no problems
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WANTED: Univox 8x10" Cabinet
Gabel
UG's Swede
Join date: Oct 2005
4,239 IQ
#4
I know what it is. I had the smae problem:
The pot has been oxidating. You shoudl put some contact spray on it. A quick sulotion is to turn the knob back and forth quicly.
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Gutch220
Join date: Dec 2002
1,758 IQ
#5
Yea, maybe.......... but I already dropped it off with the amp tech at guitar center I always go to. I will pick it up on saturday. Hopefully he can solve the problem...

.......I think I have G.A.S. for a Univox amp


.....anyone else have experience with vintage univox amps?
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WANTED: Univox 8x10" Cabinet
Gutch220
Join date: Dec 2002
1,758 IQ
#6
Well I got my amp back from the tech at guitar center today and he did the following:
-rebias
-clean all sockets and pots
-resolder "broken" joints.

But the problem is still occuring and now I have to bring it back next week to leave it there for another week.

Does anybody have any other suggestions of what the problem can be?
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WANTED: Univox 8x10" Cabinet
jj1565
Officially Knighted
Join date: May 2004
1,715 IQ
#7
replace, dont clean the offending pot.
thats what i would do.
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Gutch220
Join date: Dec 2002
1,758 IQ
#8
I don't even think its a pot though...... I have a feeling its either a transformer or the interior of an electrolytic cap. I will have a loooong talk with Mr. Amp Tech next saturday.
Trust me, I'm a doctor.
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You'll have to speak up, I'm wearing a towel.

WANTED: Univox 8x10" Cabinet