SB220

[Larry Knapp]

Alex - I would check the resistors that measure the SB-220 voltage.  Your power
supply may be OK.  The resistor bridge may have changed values.

73 Larry KC8JX
--- Alex Wa4Ak <LAWALEXKAPLAN at AOL.COM> wrote:
> 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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