Sounds like K1 has welded contacts and it is a family affair as the 76
series has the same circuit.
A semi PITA to replace as its down low and behind the front panel.
----- Original Message -----
From: "CHUCK CULLIAN" <email@example.com>
Sent: Tuesday, September 20, 2011 11:07 AM
Subject: [Amps] Alpha 78 won't turn off
> I have an Alpha 78 that wouldn't turn on and I found that a 10K power
> resistor that dropped the 220 down to 110 to turn on the main relay was
> open. When I replaced it, the amp came on but when the off button is
> pushed, it only turns off momentarily while the off switch is held. When
> I let up on the Off switch, the amp comes back on. Any ideas?
> Chuck K0RF
> Amps mailing list
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