Which relay, since there are three in the unit? The symptom continued when I turned off both sets of outputs, so it had to be the protection relay. When the gremlin finally emerged, it was in the form of a mechanical rattling sound, almost certainly a relay flutter. Actually the original arrangement was that I was going to repair it for him, but after weeks of No Problem Observed I offered to buy it - he'd already replaced it in his system - and we arranged a suitable bargain price. The previous owner gave full disclosure that it seemed to have intermittent problems, but I couldn't make it misbehave. I acquired a POA2200 power amp last year. Nothing earth-shaking here but thought I'd post some pictures and notes for anyone who runs into a similar situation.
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