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A faulty rythmn preamp tube. Doing this has also gotten rid of a nasty pop when the standby switch was turned on.

I have located the culprit and it's now sorted. Thanks for the advice.

I have taken possession of a studio 22+ and recently it has developed an unwelcome "whooshing" sound, similar to the sound of wind gusting on a mic. I have changed the power tubes and a couple of the preamp tubes, which improved things but it is still happening periodically even with guitar...