[Collins] 30L-1

[Dr. Gerald N. Johnson]

On Sun, 2006-09-17 at 20:56 -0700, Carl Smithson wrote:
> Hi,
> Today while trying to check into the net my 30L-1 developed a problem. After warming up the relay won't energize. I can still receive normally.  After cooling down a while everything seems to work ok.  Last week net control indicated that I had a problem with my signal. Any suggestions?
> 
> Thanks,
> Sonny   NN8K
> ______________________________________________________________

Check the -120 volt supply. It runs the relays and biases the tubes off
and some of it supplies a little bias(voltage drop from the current
through the relay and R12 across R28) to the tubes while operating.
Could be a bad filter capacitor or diode or both.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer