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21. Re: [Amps] 3-500Z cool down time (score: 1): Author: Joe <nss@mwt.net>; Date: Tue, 6 Jun 2017 10:20:47 -0500; So this SB-220, that has been sitting since 1993, the tubes are most likely toast? Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 6/6/2017 10:14 AM; /archives//html/Amps/2017-06/msg00083.html (13,806 bytes)
22. Re: [Amps] 3-500Z cool down time (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Tue, 6 Jun 2017 15:36:05 +0000; I have seen some 3-500 tubes affected by long storage and some not. In 1995 I bought a new matched pair of Eimac 3-500 tubes. The date code on the tubes is 1994. Once in the early 2000s I tested thes; /archives//html/Amps/2017-06/msg00084.html (16,021 bytes)
23. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 6 Jun 2017 12:45:26 -0400; The initial use was for ISM amps. Except for a short time in the late 80's Eimac 3-500Z's had no seal problems and I still have a few with 70's date codes that are fine. The Chinese versions have bee; /archives//html/Amps/2017-06/msg00089.html (13,199 bytes)
24. Re: [Amps] 3-500Z cool down time (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Tue, 6 Jun 2017 16:52:56 +0000 (UTC); The point is that you can't count on them working after prolonged storage. You may get lucky, or not. So, I think it depends on the individual tube. 73 Charlie N8RR ______________________________; /archives//html/Amps/2017-06/msg00090.html (8,515 bytes)
25. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 6 Jun 2017 13:17:31 -0400; The 3CX1000A7 preceeded the 3CX1200A7 and what followed later. Ive been using a TV translator 70's date code pull in my 2M amp for 35 years and it still shows the same 1800W max at the same drive lev; /archives//html/Amps/2017-06/msg00092.html (11,654 bytes)
26. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 6 Jun 2017 13:30:28 -0400; -- Original Message -- From: "Carl" <km1h@jeremy.qozzy.com> To: "Charlie Young" <weeksmgr@hotmail.com>; "Joe" <nss@mwt.net>; "Catherine James" <catherine.james@att.net>; "Amps group" <amps@contesting; /archives//html/Amps/2017-06/msg00093.html (16,721 bytes)
27. [Amps] 3-500Z cool down time (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 6 Jun 2017 10:40:19 -0700; <The initial use was for ISM amps. Except for a short time in the late 80's Eimac 3-500Z's had no seal problems and I still have a few with 70's date codes that are fine. The Chinese versions have be; /archives//html/Amps/2017-06/msg00094.html (11,206 bytes)
28. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Thu, 8 Jun 2017 13:18:23 -0400; <The initial use was for ISM amps. Except for a short time in the late 80's Eimac 3-500Z's had no seal problems and I still have a few with 70's date codes that are fine. The Chinese versions have be; /archives//html/Amps/2017-06/msg00120.html (14,540 bytes)
29. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Tue, 6 Jun 2017 13:25:43 -0400; I suspect that Eimac put a lot more effort into conditioning the tubes back then. Pull a better vacuum and the breakdown voltage increases. Ive hi-potted some beyond the 13KV capacity of my tester. O; /archives//html/Amps/2017-06/msg00127.html (16,761 bytes)

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