[Elecraft] KPA100 D13 Cathode High Voltage

[Michael Haygood]

All,

I performed the voltage checks at the KPA100 Test Points as stated on page 
43 of the KPA100 manual (rev. C, Feb. 11, 2004).  The D13 cathode should 
have a voltage between 90 and 150 volts; the measured voltage is 175 volts, 
which seems a little high.  Also, the voltage measured at U4 pin is -30 
volts, but the manual indicates the voltage range should be between -5 and 
-25 volts.

Consulted the schematic and it appears as if the voltage from pin 8 of U4 
supplies the High Voltage Bias Supply circuit.  Mesaured the voltage at C44 
as 45 volts, but schematic indicates it should be 30 volts.

Is 175 volts too high a voltage at the D13 cathode?  R4 is 39K.

Any suggestions or help would be greatly appreciated!

Michael
KI5E

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