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1. Re: [Amps] Pre-heating of tubes (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Sat, 29 Jul 2006 00:49:24 -0300; Ian White GM3SEK escribió: Very clear explanation, Ian, thank you very much. I want to ask something about. This pre-heating process (in, for example, NOS tubes or those used in good condition; /archives//html/Amps/2006-07/msg01271.html (8,973 bytes)
2. Re: [Amps] Pre-heating of tubes (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sat, 29 Jul 2006 00:18:29 -0400; Guillermo, It's impossible for the getter to absorb gas unless the anode is heated up hot enough to do it, if that's where the getter is at. I read some have two filaments of zirconium made to heat u; /archives//html/Amps/2006-07/msg01319.html (11,481 bytes)
3. Re: [Amps] Pre-heating of tubes (score: 1): Author: R L Measures <r@somis.org>; Date: Sat, 29 Jul 2006 04:31:28 -0700; Good question, Guillermo. If gettering really works as claimed hereabouts, why do large tubes depend on built-in ion pumps? R L MEASURES, AG6K. 805-386-3734 r@somis.org ______________________________; /archives//html/Amps/2006-07/msg01324.html (9,774 bytes)
4. Re: [Amps] Pre-heating of tubes (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 29 Jul 2006 23:12:01 +0100; It depends how careful you want to be. The full routine recommended by the Eimac tube designer was: a. Bring the filament up to rated voltage slowly, to limit the shock of turning it on. b. Then aft; /archives//html/Amps/2006-07/msg01328.html (12,416 bytes)
5. Re: [Amps] Pre-heating of tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 12:48:26 +0200 (CEST); According to my book on heat rreatment (Hardening, Tempering and Heat treatment, Tubal Cain, Nexus Special interests, ISBN 0 85242 837 5) in a dim natural light, 700 deg C is dull red, 740 blood red,; /archives//html/Amps/2006-07/msg01360.html (7,870 bytes)
6. Re: [Amps] Pre-heating of tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 12:55:54 +0200 (CEST); hereabouts, why do large tubes depend on built-in ion pumps?< Because for many of them, they don't get hot enough except around the filament. The filament can be a long way physically from the bits t; /archives//html/Amps/2006-07/msg01362.html (7,084 bytes)
7. Re: [Amps] Pre-heating of tubes (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 30 Jul 2006 13:32:02 -0400; Peter, Check again and see if that isn't degrees F your quoting. I looked this up in a few other books, one it particular because it has a color chart by Tempil who makes the paint sticks for heat tr; /archives//html/Amps/2006-07/msg01396.html (9,142 bytes)
8. Re: [Amps] Pre-heating of tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 31 Jul 2006 08:12:03 +0200 (CEST); Hi Will, Tubal Cain is dead now. He was a guy called Tom Walsh, a G2 plus 2, whow as very well known in model engineering circles. You said: >Check again and see if that isn't degrees F your quoting.; /archives//html/Amps/2006-07/msg01416.html (7,941 bytes)
9. Re: [Amps] Pre-heating of tubes (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 31 Jul 2006 05:56:57 -0400; Tempering and Heat treatment, Tubal Cain, Nexus Special interests, ISBN 0 85242 837 5) in a dim natural light, 700 deg C is dull red, 740 blood red, 800 cherry red, 825 bright cherry red, 850 red, 9; /archives//html/Amps/2006-07/msg01422.html (8,570 bytes)

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