Hello Guys,
I was loading my AL-1200 up on 10 meters last night and all at once it made a
strange noise and the grid current meter went to 0. The amp was still making
full power out even after this happened. I've checked the zener diodes and they
are good. Also checked the grid resistors on the meter board and they also
check good. What I'm seeing now when I turn on the amp is it's pulling idle
plate current and the grid meter pins negative just sitting there turned on and
not even keyed up. It shows the correct 40ma in the cw position and 150ma in
the ssb position but the amp is not even keyed up! Could someone please tell me
what this might be and where to start checking for the problem? I did pull the
tube out and turn the amp on and everything shows normal on the meters,correct
high voltage and no plate current. Grid meter stays on 0.
Thanks,Don Knight
n4dek
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