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Peavey Classic 50 problem


Joe

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Posted

Hi all. I'm having a small problem with my 50. Twice now it has gotten staticky, then the volume slowly dropped to zero. I switched the standby switch off and on and the amp worked fine. Happened once during a gig and once at rehearsal. I opened the back, all the tubes are lit up. Any suggestions ?

Posted

Im pretty sure this isnt the best advice so take it with a grain of salt.

"Nearly" everytime Ive had a problem like that just cleaning the power and standby switch, input jack, fx loop in/outs and speaker input with deoxit or something similar generally gets things going again.

If this fails for me I sometimes spray the tube pins. Thats generally never had a worthwhile result though.

Thats all from the peanut gallery. :)

Posted

Im pretty sure this isnt the best advice so take it with a grain of salt.

"Nearly" everytime Ive had a problem like that just cleaning the power and standby switch, input jack, fx loop in/outs and speaker input with deoxit or something similar generally gets things going again.

If this fails for me I sometimes spray the tube pins. Thats generally never had a worthwhile result though.

Thats all from the peanut gallery. :)

I was thinking along those line as well. I did remove and reset the tubes. Do I have to remove the switches to clean them or just spray contact cleaner into them?

Posted

I had a problem similar with my C50 and it was one bad tube

Posted

Tubes come to mind for me too. In fact, how old are they?

Tubes are probably a year or so old. Maybe as much as two. I have a new set of power tubes. I'll swap those now.

Posted

I was thinking along those line as well. I did remove and reset the tubes. GDo I have to remove the switches to clean them or just spray contact cleaner into them?

just spray them and flick them on and off a few times.

I dont know if this is The problem though. Its just where i start before swapping tubes or spending money.

Posted

Hi all. I'm having a small problem with my 50. Twice now it has gotten staticky, then the volume slowly dropped to zero. I switched the standby switch off and on and the amp worked fine. Happened once during a gig and once at rehearsal. I opened the back, all the tubes are lit up. Any suggestions ?

 

I had a similar sounding problem with my Patriot a few years ago. It would have static when first turned on, and lose volume. A cycle or two and it would come back. It finally went out, and sounded like a dead short across the inputs. My repair guy found a bad resistor, (screen grid resistor If I recall correctly). He replaced the resistor, we put in a new set of Ruby tubes and its been solid ever since.

Posted

Any luck?

Haven't had a chance to test it yet. Rehearsal tonight, gig Saturday. I may know something after that.

Posted

Sounds like it may be a rectifier tube.

Other than taking it to a tech, can I check that myself?

Posted

Sounds like it may be a rectifier tube.

IIRC my Classic 50 head didn't have a tube rectifier, it was SS. But I got rid of it MANY years ago so I could be wrong.

Posted

When a rectifier tube went bad in my amp (Victoria Deluxe) it blew a fuse at the same time. I don't know if that always happens or if it was just this amp. I replaced the tube and fuse and everything was fine.

Posted

Amp worked well at rehearsal last night. No buzz or hum at idle. New tubes seemed to have done the trick. Thanks to all for the input.

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