[Heath] Calling Heath SB 220 EXPERT TECHS

[Guy Giacopuzzi]

Make sure you haven't hurt/damaged the HV circuit shunt resistor...this 
can cost you the meter, which is NLA!

Guy

WA6OQQ


On 2/2/2018 1:19 PM, John King via Heath wrote:
> 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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