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1. [Amps] Tetrodes (score: 1): Author: "earl baillley" <earlbailley@centurytel.net>; Date: Sat, 9 Jul 2005 21:41:23 +0100; Hi planning to swap triodes in my old 374a with Russian bottles of near equal dissapation. I couldn't in good concscience pay more than 100 bux for a bottle out of a VOA monster. Govt subsidized KW S; /archives//html/Amps/2005-07/msg00079.html (6,378 bytes)
2. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 9 Jul 2005 14:09:06 -0700; For small tetrodes, the safest way to power the screen is through a high-ohm power resistor connected to the anode supply, feeding a shunt V regulator connected in parallel with the screen. This conf; /archives//html/Amps/2005-07/msg00080.html (7,526 bytes)
3. Re: [Amps] Tetrodes (score: 1): Author: PA3DUV <pa3duv@planet.nl>; Date: Mon, 11 Jul 2005 15:47:44 +0200; What is "small"? 73, Dick Knol PA3DUV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-07/msg00083.html (8,714 bytes)
4. Re: [Amps] Tetrodes (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Mon, 11 Jul 2005 10:29:23 -0500; What is "small"? 73, Dick Knol PA3DUV Tubes that do not have built-in handles are small; to me anyway..... (((73))) Phil, K5PC _______________________________________________ Amps mailing list Amps@c; /archives//html/Amps/2005-07/msg00084.html (7,229 bytes)
5. Re: [Amps] Tetrodes (score: 1): Author: "Mark Marsden" <mm@plextek.co.uk>; Date: Mon, 11 Jul 2005 16:56:44 +0100; That's one way but it certainly isn't the safest. For tubes without handles check out the Tetrode Boards on http://www.ifwtech.co.uk/g3sek/boards/tetrode/tetrode-1.htm 73 Mark G4AXX What is "small"?; /archives//html/Amps/2005-07/msg00085.html (7,655 bytes)
6. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Mon, 11 Jul 2005 08:57:45 -0700; Dick -- Those that use screen potentials of under 800v or so. For tetrodes with handles, shunt screen regulation is do-able but not very practical. cheers Rich Measures, 805.386.3734, AG6K, www.somis; /archives//html/Amps/2005-07/msg00086.html (8,063 bytes)
7. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Mon, 11 Jul 2005 09:13:06 -0700; I have never had a case where the 250v-rated 3AG fuse in the primary of the screen supply xfmr failed to open when needed to protect the screen Rich Measures, 805.386.3734, AG6K, www.somis.org ______; /archives//html/Amps/2005-07/msg00087.html (8,815 bytes)
8. Re: [Amps] Tetrodes (score: 1): Author: Mike <k4gmh@arrl.net>; Date: Mon, 11 Jul 2005 13:44:07 -0400; Hello, I agree with Mark as Ian's Tetrode Boards have saved my tube (4CX1600B) many times due to operator error. 73, Mike, K4GMH _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2005-07/msg00089.html (8,870 bytes)
9. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 11 Jul 2005 19:21:55 +0100; And the mains fuse protected the screen from what... and how? -- 73 from Ian G/GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2005-07/msg00090.html (7,640 bytes)
10. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Mon, 11 Jul 2005 13:52:34 -0700; ... exceeding the 275w max diss. rating during a glitch. ... by stopping the flow of current into the screen PS. - note - Reverse screen-I is handled by a screen-cathode bleeder R which draws c. 30mA; /archives//html/Amps/2005-07/msg00091.html (8,143 bytes)
11. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Mon, 11 Jul 2005 23:16:08 +0100; wrote: If the "glitch" is an arc from anode to screen, the mains fuse won't protect the screen at all. Both series and shunt screen regulators have good and bad points, but it's important to think ex; /archives//html/Amps/2005-07/msg00093.html (9,582 bytes)
12. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Mon, 11 Jul 2005 17:12:37 -0700; A tube that arcs from the anode to the screen is already a goner, Ian, so there is nothing of value to protect. Common reasons for high dissipation in the screen are loss of load, loss of anode suppl; /archives//html/Amps/2005-07/msg00100.html (9,869 bytes)
13. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 07:36:42 +0100; wrote: That simply isn't true. Well designed power supplies can protect the tube, the anode supply and the screen supply against a wide range of faults, including arcs. Many of these faults are compl; /archives//html/Amps/2005-07/msg00106.html (9,348 bytes)
14. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Tue, 12 Jul 2005 00:13:14 -0700; What condition would make the anode arc to the screen? ... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-07/msg00107.html (8,643 bytes)
15. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 10:14:07 +0100; wrote: As many folks will remember from previous repetitions of this topic, reasons for anode-screen arcs include: 1. Loss of load at a phase angle that results in extremely high anode voltages. With; /archives//html/Amps/2005-07/msg00108.html (11,233 bytes)
16. Re: [Amps] Tetrodes (score: 1): Author: "Larry Carman" <lncarman@swbell.net>; Date: Tue, 12 Jul 2005 06:57:23 -0500; What causes the gas release that produces an internal arc? As many folks will remember from previous repetitions of this topic, reasons for anode-screen arcs include: 1. Loss of load at a phase angle; /archives//html/Amps/2005-07/msg00110.html (11,469 bytes)
17. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Tue, 12 Jul 2005 07:18:23 -0700; When load loss happens, the first thing to arc is the Tune-C. The resultant metal-vapour arc reduces the anode potential to a few tens of volts. The bang is not from an arc in a vacuum. In a typical; /archives//html/Amps/2005-07/msg00112.html (12,840 bytes)
18. Re: [Amps] Tetrodes (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Tue, 12 Jul 2005 07:29:37 -0700; The operator had a bacon, eggs and beans burrito for breakfast? Consumption of such is known to be especially risky around RF amplifiers. One theory has it that the salt used to cure bacon somehow ma; /archives//html/Amps/2005-07/msg00113.html (13,549 bytes)
19. Re: [Amps] Tetrodes (score: 1): Author: Ian White GM3SEK <g3sek@ifwtech.co.uk>; Date: Tue, 12 Jul 2005 15:25:19 +0100; Here's the story (it's a bit long, because I didn't have time to write a short one)... A so-called "vacuum" tube is actually a very complex piece of chemistry. For a start, the "vacuum" space is far; /archives//html/Amps/2005-07/msg00114.html (11,824 bytes)
20. Re: [Amps] Tetrodes (score: 1): Author: "Peter Chadwick" <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 12 Jul 2005 15:44:37 +0100; Additionally, some tubes (the old 35T comes to mind) have tantalum anodes. Tantalum has the property of absorbing gas when it gets hot, unlike most materials. So tantalum anodes are designed to run h; /archives//html/Amps/2005-07/msg00115.html (8,601 bytes)

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