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1. [Amps] why does input SWR change when HV applied? (score: 1): Author: "Neil Carr G0JHC" <g0jhc@blueyonder.co.uk>; Date: Sun, 17 Oct 2004 16:33:41 +0100; I have a question..maybe dump, but I don't know the answer. Just finished a YC156 amp .all working well. I was surprised to have to re-tune the input circuit to such an extend that I had to open up a; /archives//html/Amps/2004-10/msg00239.html (7,432 bytes)
2. Re: [Amps] why does input SWR change when HV applied? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sun, 17 Oct 2004 11:40:11 -0400; Neil, Without any plate voltage, the internal resistance is different than when the tube is operating and the anode impedance drops. Checking it without voltage, it will be different (higher resistan; /archives//html/Amps/2004-10/msg00242.html (8,406 bytes)
3. Re: [Amps] why does input SWR change when HV applied? (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Sun, 17 Oct 2004 13:14:29 -0400; Neil, The cathode match works into both the input capacitance and the resistive component of the cathode. The resistive component comes from the fact that the cathode circuit carries both the plate a; /archives//html/Amps/2004-10/msg00243.html (8,910 bytes)

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