Lock do you have a tube extender? Maybe the socket has some corrosion
and the signal is not making it through the tube? Try cleaning the
socket and tube pins.
Jim/W5JO
Hi to all. Maybe someone has had a similar problem and can give me a
hand. My ART-13 works fine on the lower frequencies, below 6 Mcs. But
above 6 Mcs, no grid drive. So, problem seems to be in the 2nd
multiplier stage. I've done all the usual things, changed tubes, made
resistance measurements, from the tube socket, etc.All was within
specs. Also, someone suggested maybe a leaky coupling cap between the
1st and second multipliers. So, I replaced the cap by wiring a new one
into an electrically equivalent position. No joy !! Before I attempt
to remove the whole multiplier sub-assembly, does anyone have any
thoughts or suggestions. Thanks !
73, Lock W1ZD/7
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