You might want to consider two limiting factors. 1. What is the current rating of the doorknob? It might work OK, but it may not be rated for the needed current. It could break down or heat up. 2. The minimum capacitance would be affected as you stated, which would limit the tuning range. 73, Jack, W9GT
John King <[EMAIL PROTECTED]> wrote: Need a little technical consultation, if you can run this through your head for me. I have an AMP Supply LK 500ZA amplifier using two 3-500Z tubes. The tank circuit was designed and built very rinky dink and light weight. Otherwise, it is a fairly well built amp. I have had to rebuild the tank circuit and put a heavy duty band switch in it. The amp had a C1 in it comprised of a 250PF variable paralleled by two fixed 200PF caps that stayed in the circuit all the time. My question is since I don't have two two 200PF caps, would one 500PF @ 20,000KV doorknob do the job? With this change, I will have 750PF instead of 650PF at C1. Something in the back of my mind tells me that one can run into trouble when paralleling variable caps and fixed caps because it changes the minimum capacity available from the variable cap. What are your thoughts on this based upon your knowledge and experience? I can provide you with a schematic of the tank circuit directly as I have scanned that part of the tank circuit. Denny Hadd at Amp Supply really cut corners in the design and manufacture of an otherwise good amplifier. Your assistance will be greatly appreciated. 73, John, K5PGW ____________________________________________________________________________________ You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost. http://tc.deals.yahoo.com/tc/blockbuster/text5.com ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ 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 Searchable Archives: http://www.mail-archive.com/[email protected]/ 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.
