SB220

[Mark Graalman WB8JKR]

  It wouldn't be the diodes, I'd check the HV metering multiplyer
string, namely R6 through R9. The diodes have nothing
to do with your HV showing low.

Mark  WB8JKR


On Thu, 25 Dec 2003 14:30:24 EST Alex Wa4Ak <LAWALEXKAPLAN at AOL.COM>
writes:
> I have an SB220 in near mint condition.  My problem is that when
> testing
> according to the manual, the high voltage readings are a bit low,
> perhaps 400
> volts low.  I think it may be the silicon diode stack in the high
> voltage power
> supply, but the manual and schematic only refers to them as silicon
> diodes with
> a Heath in-house part number of 57-27.  Does anyone know a good
> modern
> substitute for these and a source for them?  Any assistance would be
> appreciated.
> Alex Kaplan, WA4AK
> lawalexkaplan at aol.com
>
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