Peavey classic 30 ghost note

[catstrat]

I have a Peavey classic 30 that came to me and it has a peculiar kind of a hum,buzz, distorted sound as you let the guitar notes ring out, especially G. New speaker,new tubes and everything is tightened in the cabinet. Any ideas?

[Jazz P Bass]

Check the power supply.
You may have a bad cap.

[catstrat]

Hi Jazz p. How are you? I'm thinking you're right. Since i have the boards out of it already i might as well do a complete filter cap service on it . These are not my favorite amps to work on, but it is what it is and that's my job. I'll do that tomorrow and let you know. Thanks.

[Jecarroll7]

I had a prosonic that did something similar. Letting a low A note play out through decay I got all sorts of interesting stuff mixed in. I walked the tone circuit with a scope and guitar from input through the band filter until I found a bad cap. Clean on one side, spikes on the other.