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1. [Amps] 3-500Z convertion (score: 1): Author: "Hsu" <Jbenson@sohu.com>; Date: Sun, 23 Jul 2006 18:54:09 +0800; Hi, I'm a new member.My TL922's 3-500Zs died,I have some 4X500As,it seems the 3-500Z can convertion by 4X500A, Does anyone have this experience?Thanks in advance! 73! Hsu ____________________________; /archives//html/Amps/2006-07/msg00922.html (6,384 bytes)
2. Re: [Amps] 3-500Z convertion (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 23 Jul 2006 13:14:31 +0200 (CEST); The 4X500A is an external anode tube, so the cooling won't be right, it needs a different socket, and it's a tetrode. You'd need to do soem careful calculation to determine if the grid and screen dis; /archives//html/Amps/2006-07/msg00925.html (7,868 bytes)
3. Re: [Amps] 3-500Z convertion (score: 1): Author: "Hsu" <Jbenson@sohu.com>; Date: Sun, 23 Jul 2006 20:14:20 +0800; Thanks Peter! I have got a a died TL922 as a junk,I only pay $100 for it.so I don't want pay for it too much.Althought the 3-500Z are made in China, but I call the factory, They ask me pay $500 for a; /archives//html/Amps/2006-07/msg00928.html (9,304 bytes)
4. Re: [Amps] 3-500Z convertion (score: 1): Author: Jan Erik Holm <sm2ekm@telia.com>; Date: Sun, 23 Jul 2006 16:15:38 +0200; As far as I remember you can not run 4X500´s in zero bias GG, you will not be able to get correct ZSAC for linera operation. 4X500´s need screen and grid voltages to get correct operating; /archives//html/Amps/2006-07/msg00932.html (10,637 bytes)
5. Re: [Amps] 3-500Z convertion (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Sun, 23 Jul 2006 10:53:51 -0400; I maybe it careful to _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00934.html (11,254 bytes)
6. Re: [Amps] 3-500Z convertion (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 23 Jul 2006 16:58:55 +0200 (CEST); The big problem will be arranging the cooling. My RCA book says the maximum seal temperature is 150 deg C, and they don't look from the drawing easy to arrange cooling around it. I have little doubt; /archives//html/Amps/2006-07/msg00935.html (7,665 bytes)
7. Re: [Amps] 3-500Z convertion (score: 1): Author: "Hsu" <Jbenson@sohu.com>; Date: Mon, 24 Jul 2006 00:06:05 +0800; It is right. I have to mod the cooler system. 73! Hsu _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00939.html (8,517 bytes)
8. Re: [Amps] 3-500Z convertion (score: 1): Author: "Hsu" <Jbenson@sohu.com>; Date: Mon, 24 Jul 2006 00:22:55 +0800; Thanks,Richard. The big problems is the factory no merchandise on hand now. they ask $190/ea for the 3-500Z now! 73! Hsu _______________________________________________ Amps mailing list Amps@contest; /archives//html/Amps/2006-07/msg00942.html (12,905 bytes)
9. Re: [Amps] 3-500Z convertion (score: 1): Author: R L Measures <r@somis.org>; Date: Sun, 23 Jul 2006 06:25:24 -0700; HSU -- My choice would be to sell the 4X500As and purchase one Chinese 3-500ZG. If your 3-500Z died from a filament to grid short, your TL-922 may have intermittently oscillated c. 120MHz. The fix is; /archives//html/Amps/2006-07/msg00987.html (9,196 bytes)
10. Re: [Amps] 3-500Z convertion (score: 1): Author: R L Measures <r@somis.org>; Date: Sun, 23 Jul 2006 06:34:31 -0700; You only need one tube because the Mu of an Eimac tube and the Mu of a Chinese tube is similar. Also, if the tube manufacturer has tight tolerances and good quality control, there is no need to match; /archives//html/Amps/2006-07/msg00988.html (11,881 bytes)
11. Re: [Amps] 3-500Z convertion (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 24 Jul 2006 07:56:27 +0200 (CEST); Rich a Chinese tube is similar. < Are you saying that you can replace the original 2 tubes with just one? And get the same output, but only have half the plate dissipation? 73 Peter G3RZP ___________; /archives//html/Amps/2006-07/msg00999.html (8,259 bytes)
12. Re: [Amps] 3-500Z convertion (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Mon, 24 Jul 2006 09:15:51 -0400; Hello Hsu: As others have discovered, we can not reply directly to you from the United States. Additionally, my spam filter automatically deleted your email to me, before I could read your message. I; /archives//html/Amps/2006-07/msg01010.html (11,929 bytes)
13. Re: [Amps] 3-500Z convertion (score: 1): Author: Bob Nielsen <nielsen@oz.net>; Date: Mon, 24 Jul 2006 07:39:45 -0700; Maybe you would have better results if you addressed your email for Hsu to sohu.com instead of sohu.co. His mail server appears to be reachable: $ host -t mx sohu.com sohu.com mail is handled by 10 s; /archives//html/Amps/2006-07/msg01015.html (13,438 bytes)
14. Re: [Amps] 3-500Z convertion (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Mon, 24 Jul 2006 11:07:36 -0400; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg01021.html (14,790 bytes)
15. Re: [Amps] 3-500Z convertion (score: 1): Author: R L Measures <r@somis.org>; Date: Mon, 24 Jul 2006 06:29:35 -0700; no, I thought he said only one of the two tubes was bad. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://list; /archives//html/Amps/2006-07/msg01035.html (8,483 bytes)
16. Re: [Amps] 3-500Z convertion (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 25 Jul 2006 10:59:46 +0200 (CEST); Major confusion here........I thought he needed to replace both of them. From what Karl Arne said, it sounds a bit as if the 4X500 is 4-250/4-400 with a different base and an external anode. That mak; /archives//html/Amps/2006-07/msg01066.html (8,988 bytes)
17. Re: [Amps] 3-500Z convertion (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 25 Jul 2006 11:14:59 +0200; It was actually Jan-Erik SM2EKM (the other SM list member with a double first name) that wrote that. The 4X500 is very much a FM/TV transmitter tube (valve). They were extensively used in the first g; /archives//html/Amps/2006-07/msg01067.html (10,332 bytes)
18. Re: [Amps] 3-500Z convertion (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 25 Jul 2006 16:51:44 +0100; If they're the ones I'm thinking of, the screen grid connection is a beast unless you have the proper socket. Steve _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2006-07/msg01088.html (8,465 bytes)

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