> much quieter.  It would happen randomly, but usually 
> some time after switching it on, and sometimes thumping 
> the case would correct it - I suspect it had a dry joint 
> somewhere

Or was a masochist. Perhaps a slave amp ?

Mine also used to go quiet in one channel. I tracked it down
to a faulty cap in the pre-amp that sucked up drive meant for
a transistor

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