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Total 17 documents matching your query.

1. [Amps] 3-500Z plate durability (score: 1): Author: jsb@digistar.com; Date: Tue, 9 Dec 2003 10:15:43 -0500 (EST); We got a good rousing set of replies on how to wire 220V, maybe we can strike gold again on this one... 3-500Z plates - I'm reading that they "enjoy" getting dull red hot. My first ham gear was a Dra; /archives//html/Amps/2003-12/msg00147.html (7,686 bytes)
2. Re: [Amps] 3-500Z plate durability (score: 1): Author: "carl seyersdahl" <carlseye@tampabay.rr.com>; Date: Tue, 9 Dec 2003 18:23:33 -0500; I don't know about the 3-500 , but I think it depends on the tube type.!! When I was in signal school, (many years ago, 1948) we were taught how to tune and load a hi-power amp using the color of the; /archives//html/Amps/2003-12/msg00150.html (9,657 bytes)
3. Re: [Amps] 3-500Z plate durability (score: 1): Author: jsb@digistar.com; Date: Wed, 10 Dec 2003 10:03:29 -0500 (EST); Okay - I had read it the wrong way then. I read it as though the energy striking the plate (and not the movement through it) was creating the heat. I wasn't totally sure about that. Wow - so regardle; /archives//html/Amps/2003-12/msg00156.html (9,625 bytes)
4. Re: [Amps] 3-500Z plate durability (score: 1): Author: ka1xo@juno.com; Date: Wed, 10 Dec 2003 00:28:34 GMT; In light of the observation of internal parts becoming so hot they glow a dull red in glass envelope tubes, and the ensuing call for comments thereon, please allow a reflection from the last thirty f; /archives//html/Amps/2003-12/msg00158.html (8,894 bytes)
5. Re: [Amps] 3-500Z plate durability (score: 1): Author: Joe Isabella <n3ji@yahoo.com>; Date: Wed, 10 Dec 2003 06:32:13 -0800 (PST); Well, since I seem to have started the last round, let's see what I can do here... It's normal for these types of tubes for their plates to turn cherry red. They are run 24/7 like that in the broadca; /archives//html/Amps/2003-12/msg00160.html (9,910 bytes)
6. Re: [Amps] 3-500Z plate durability (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 9 Dec 2003 19:11:17 -0800; ** The materials used (C or Ta) have a higher melting point than orange-yellow heat. ** Electron movement is "plate"/anode current. ** All thoriated-tungsten tubes gradually loose emission as the ca; /archives//html/Amps/2003-12/msg00162.html (9,436 bytes)
7. Re: [Amps] 3-500Z plate durability (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 10 Dec 2003 08:06:05 -0800; ** Correct. Reducing filament-V automatically c. 3% during Rx makes economic sense. The amplifier shown in: http://www.somis.org/PBox.top.inside.jpeg has this feature. ** Depends on filament tempera; /archives//html/Amps/2003-12/msg00163.html (10,744 bytes)
8. Re: [Amps] 3-500Z plate durability (score: 1): Author: Ed Briggs <edbriggs@optonline.net>; Date: Thu, 11 Dec 2003 06:49:32 -0500; Some tubes are made to exhibit red color under maximum CCS or ICAS ratings. The transmitting tube datasheets often contain text such as "the plate shows a dull red color at maximum CCS ratings", or "; /archives//html/Amps/2003-12/msg00174.html (15,000 bytes)
9. Re: [Amps] 3-500Z plate durability (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Thu, 11 Dec 2003 09:00:10 -0500; At 06:32 AM 12/10/03 -0800, Joe Isabella wrote: In my amp, when I transmit (espeically in the typical long-winded 350W carrier AM transmission), my RF Parts 3-500ZGs get quite red (almost orange). Af; /archives//html/Amps/2003-12/msg00176.html (9,249 bytes)
10. Re: [Amps] 3-500Z plate durability (score: 1): Author: Ed Briggs <edbriggs@optonline.net>; Date: Thu, 11 Dec 2003 12:41:24 -0500; That is good to know. Given however, that the manufactures of the amps (e.g. QRO, Ten Tec, etc) don't use the larger fans (split chassis or elevated socket 130 mm tubeaxial), they derate their amps i; /archives//html/Amps/2003-12/msg00180.html (10,526 bytes)
11. Re: [Amps] 3-500Z plate durability (score: 1): Author: jsb@digistar.com; Date: Thu, 11 Dec 2003 10:13:54 -0500 (EST); What's the grid current at that point - 80mA or thereabouts? Plate current? I had a couple QSOs early this morning on CW and noticed that the plates begin to show a faint bit of color near the bottom; /archives//html/Amps/2003-12/msg00188.html (9,037 bytes)
12. Re: [Amps] 3-500Z plate durability (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 11 Dec 2003 07:47:41 -0800; chimneys)... ** I have observed that the glass-tube cooling system which produces the lowest glass temperature is not the air-sytem socket and chimney, it is the simple split-chassis tranverse fan s; /archives//html/Amps/2003-12/msg00192.html (9,106 bytes)
13. Re: [Amps] 3-500Z plate durability (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 12 Dec 2003 05:24:08 -0800; ** 3-500Zs have no grid-I rating. They have a grid-dissipation rating of 20w -- which can be exceeded (as in glowing grid wires) for brief periods without damage. Grounded-grid/cathode-driven amplif; /archives//html/Amps/2003-12/msg00202.html (10,277 bytes)
14. Re: [Amps] 3-500Z plate durability (score: 1): Author: jsb@digistar.com; Date: Fri, 12 Dec 2003 10:58:56 -0500 (EST); I wonder why grid current is measured instead of dissipation - I would think dissipation and current measurements could be easily interchanged for display on a meter. Interesting - I thought Ep dropp; /archives//html/Amps/2003-12/msg00209.html (10,668 bytes)
15. [Amps] 3-500Z plate durability (score: 1): Author: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>; Date: Fri, 12 Dec 2003 18:17:35 +0000; The Centurion has the 3-500 sockets in a cage (elevated platform) which I thought was a standard chassis setup for cooling. The muffin fan is mounted vertically inside the cabinet perpendicular to th; /archives//html/Amps/2003-12/msg00210.html (9,723 bytes)
16. Re: [Amps] 3-500Z plate durability (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 12 Dec 2003 10:19:35 -0800; ** Grid-I is usually defined as average indicated current on a typical meter. A system for measuring actual dissipation would be considerably more complex. In any case, grid-dissipation is not a pro; /archives//html/Amps/2003-12/msg00214.html (9,295 bytes)
17. Re: [Amps] 3-500Z plate durability (score: 1): Author: Ed Briggs <edbriggs@optonline.net>; Date: Sat, 13 Dec 2003 10:25:46 -0500; Here, Rich is talking about something different than the plate voltage reading on the meter. During operation, the tubes acts like a variable resistor between the high voltage supply and ground. The; /archives//html/Amps/2003-12/msg00223.html (12,783 bytes)

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