Amp making noise on shut off

Is replacing caps a factory repair job?

Any competent technician could do the job. Is the amp in warranty? If yes, I'd send it back for repair.

@acefactory Is replacing caps a factory repair job?

It seems the noise after amp shutdown could be a capacitor or two on the way to failure - I had a similar symptom in a preamp that was solved by replacing the caps...

@atmasphere  sorry about misspelling. I have grest respect for your OTL Amplifiers :)

Thanks again Atmisphere :)

I've seen solid state amps do this too. This is a bit more concerning than it is in a tube amplifier; it may mean that an active device is failing. If this is the case I think you'll find that it gets noisier to the point that you hear it when the amp is on- at which point it should be serviced, as the noise could be the result of an oscillation. I wouldn't worry about it other than that.

Thanks. Mine is ss amp.

Meaning: nothing to worry about. Some tubes will do this and its not an indication of failure or sound quality.