The saga continues....

Removing the plug in module DID clear the 100 ohm 'short' to ground on the
100 volt line.

Swapping tubes did NOT fix the -150 volt supply however.
It only measures -131 volts (after several minutes of 'post hv turn on'
warm up). It drifts much more during the warm up than the -150 volt
adjustment pot will swing to voltage. In fact I see very little change as I
adjust the pot.

The 100 volt supply is putting out about 130 volts and the rest of the
supplies look about normal (have not checked the HT supply to the CRT. I
wonder if it being too high could cause all my symptoms).

Measured the current out of the -150 and 100 volt supplies (across the 5
and 10 ohm series resistors). ~.95 volts /5 ohms = 190 ma for the -150
supply
~1.4 volts/10 ohm = 140 ma for the 100 volt supply. I am assuming that
those values are not unusual. I have not looked at ripple, etc., yet.

Looks like I am going to have to measure voltages at several points and try
to make sense of any patterns that emerge.






--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

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