I feel your pain.... i'd try injecting RF directly to the grid of the 2nd mult stage to see if you get a desired output. Also check that the lettered dials are lined up correctly to their contacts. If my memory is correct, this ensures the proper sets of freq determining ckts are switched in.... gud luck
----- Original Message ----- From: [EMAIL PROTECTED] Date: Wednesday, September 19, 2007 0:51 am Subject: [AMRadio] Help with ART-13 To: [email protected] > 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 > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
