Power switch kuh - thump !!!

I have a guitar preamp ( Marshall JMP-1 ) .
When it powers up , there is very loud Kuh - thump on the output .
How do I modify it to get rid of this annoying trait ?


Thanks

Chris

 

Connect the contacts of a suitable relay in series with the amp output and
have a delayed turn-on of the relay (few seconds), in other words he
contacts are connecting the speaker to the amp output only after the
power-on transients have subsided.. This works fine only if the amp output
stage is in push-pull configuration.
Gene

 

1: OP said its a preamp so it might be turned on independently of the amp.
2: My real question-- why won't your relay solution work with a single ended amp?

GG