|[AMRadio] Help with ART-13|
w5jo at brightok.net
Wed Sep 19 09:01:46 EDT 2007
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.
> 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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