[Amps] Alpha 78 Failure
Paul Gerhardt
phgerhardt at gmail.com
Tue Dec 27 10:38:05 PST 2011
After a couple of years working well and many thousands of Q's the
Alpha 78 quit. It still switches to xmit, I can hear the relays,
there is a small amount of grid current but no plate current so I am
thinking that the bias is not switching. The HV reads normal. Last
time I worked on it I replaced and reworked some parts on the QSK
board two or three years ago.
Does anyone have an idea of how to troubleshoot this?
Paul
--
Paul Gerhardt
K3PG
http://pgerhardt.blogspot.com
QRP ARCI 6674
FP 274
"You must do this work with love or you fail." -- John Muir, from How
to Keep Your Volkswagen Alive
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