[Heath] Calling Heath SB 220 EXPERT TECHS

[John King]

Folks, I have a question. My SB 220  amp has filaments and HV. BUT, when amp is turned on, the plate meter goes negative slightly and softly. In addition, grounding the relay jack does not key up the amp. No relay pull in or click and no resting current on finals.
I replaced the diode that provides relay voltage thinking the relay supply might not be providing voltage.
I am puzzled because the relay keying circuit is simple but given the negative movement of the plate meter makes me wonder if something is wrong on the rectifier/metering board.
73, John, K5PGW
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