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This integrated amp operates normally for about
three minutes then abruptly buzzes and goes offline
(no sound but power light indicating online). If
immediately restarting amp resumes online power light
but no sound. After a longer cooling down period and
then re-powering the unit, it will go back online and play
over the speakers only to shut-down (no sound/power
on) after about three minute of normal play.

Any methodologies to diagnosis or identify the
source of problem would be helpful? The shortwave
radio back-up isn't making for me in the weight
room. smile