Reverb noise Classic 30

[bschmoove]

I recently bought a newish tweed Peavey Classic 30 and I love it.
But when I use the amp reverb it seems to produce a feedback-like hum which stays pretty low. As soon as I hit the switch to turn it off, the hum stops.
Any other C30 owners experience this?
Is this solely a C30 problem or do other amps have this problem?
Thanks in advance for the help.

 

[bschmoove]

Let me add it sits on top of my workbench which is chest level so the amp is emitting right into my Tele.

 

[rockon1]

IIRC Ive had reverb feedback when the tank was too tightly fastened to the cab. Might try loosening it up a bit if it is. Feedback and hum are different though. Does it get worse as the reverb is turned up? If its more of a hum make sure the connections are well seated to the tank. Bob

 

[Jlew]

My classic 30 does the same. I haven't bothered to fix it, but apparently if you cushion the reverb tank a bit so it has less firm contact with the bottom of the cabinet, it will help.

 

[hank57]

Try different guitar? Try moving away from amp? Set the amp on the ground? The reverb circuit is a little amp of its own and can feedback and hum depending on your location to it.

 

[hank57]

Good coomments from c30 owners. The fender tank has a piece of cardboard on the open side and then a vinyl bag and the screws go through edges of the bag instead of the tank. Lots of dampening right there.

 

[blackba]

I don't notice the feedback issue, but I do notice that using reverb on huge classic 30 increases the background noise of the amp. At least on the to c30s my friend has.

 

[custom53]

My Classic 100 does it occasionally when I am fairly close and facing the Head...

 

[racine2000]

Had this happen on my c50...ended up being a chip was a really cheap/easy fix..

 

[teefus]

yes check the chip and the molex connectors for the reverb system.

 

[racine2000]

If you do end up changing the chip it is ic 4558... No soldering needed, just pop the old one out and pop in the new one...