[Collins] Fw: No P.A. Plate Current on 32S-3

[Dr. Gerald N. Johnson, electrical engineer]

There should be 40 to 50 ma idling current in the PA without drive. The
easiest way to not have idling current is to have too much bias, but
then the drive should raise the plate current. The next easiest failure
is to have no screen voltage. There are a pair of jacks on the back of
the chassis with an internal jumper that is cut to remove PA screen
voltage when the 32S is used with a transverter. Check that jumper,
probably by plugging in a RCA to RCA cable between them.

The PA tubes could be bad.

The idling current should be set by the bias adjustment pot on the power
supply to the manual's specifications. A little plate current will make
the tubes more sensitive to drive.

73, Jerry, K0CQ, Technical Advisor to the CRA

-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.