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41. Re: [Amps] Input Impedance of GI-7BT Triode (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Sun, 14 Sep 2003 08:55:34 +0100; The easiest thing to do would be: a) to guess b) take it to a friendly RF engineer who has a network analyser Triodes. auto-tuner. _______________________________________________ Amps mailing list Am; /archives//html/Amps/2003-09/msg00118.html (7,904 bytes)
42. Re: [Amps] Tufnol rod (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Mon, 15 Sep 2003 22:16:48 +0100; Neil, is similar to Solid Resin Paper Board (SRBP) in properties. Personally I would use PTFE for the job you are describing, we (John G6YIN and myself) have used this on several 3-500Z, 8877 and GS3; /archives//html/Amps/2003-09/msg00133.html (10,025 bytes)
43. Re: [Amps] Conditioning Spare Tubes After Storage (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Sun, 12 Oct 2003 19:55:29 +0100; ? Even for a gassy tetrode with handles, I have never found one that would magikly get mo' betta by operating the filament. The bottom-line seems to be: if there's gas, you'd better pass. However, i; /archives//html/Amps/2003-10/msg00098.html (9,249 bytes)
44. Re: [Amps] About single 4CX250b output power (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Wed, 29 Oct 2003 21:00:41 -0000; Page 65 of Eimac's "Care and feeding of power grid tubes" shows a selection guide for SSB service for which the 4CX250B is listed as being capable of 348W "useful power output" in AB1 with a 3rd orde; /archives//html/Amps/2003-10/msg00286.html (8,925 bytes)
45. Re: [Amps] slow down circuits for 240v blower (score: 1): Author: "Michael J. Tubby B.Sc. (Hons) G8TIC" <mike.tubby@thorcom.co.uk>; Date: Wed, 19 Nov 2003 13:47:22 -0000; The trick that I use is a "motor run" capacitor in series - typical values are 1-15uF 440VAC rated. You can use a single cap or more than one if you want more than two speeds and switch across them.; /archives//html/Amps/2003-11/msg00267.html (10,603 bytes)
46. Re: [Amps] HV cable for abt 200 degrees celsius? (score: 1): Author: "Mike Tubby" <mike.tubby@thorcom.co.uk>; Date: Tue, 13 Apr 2004 21:40:01 +0100; IMHO you don't need "special" insulation, use RG400 PTFE coax which is both double screened and easily capable of working at over 200 C... problem solved... I use RG400 for all my EHT leads with eith; /archives//html/Amps/2004-04/msg00089.html (9,154 bytes)
47. Re: [Amps] Tetrodes (score: 1): Author: "Michael J. Tubby G8TIC" <mike.tubby@thorcom.co.uk>; Date: Mon, 25 Jul 2005 02:02:34 +0100; All, I can't speak for the gas release, but I can speak as the owner of a 2 x 4CX250B 144MHz amp that used to "let go" randomly before I got a handle on the problem... I'm talking of 25+ years ago he; /archives//html/Amps/2005-07/msg00323.html (15,290 bytes)

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