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1. [Amps] Dimished Tube Life (score: 1): Author: "MICHAEL HUGHES" <mhughes149@verizon.net>; Date: Thu, 24 Sep 2009 22:43:13 -0400; Hello all ! I wonder, and I hope someone can offer a reasonable explanation. If I turn on my AL 1500 Amplifier, which uses the 8877 indirectly heated cathode tube when I come into the shack and then; /archives//html/Amps/2009-09/msg00293.html (6,649 bytes)
2. Re: [Amps] Dimished Tube Life (score: 1): Author: Gary Patterson <gpatterson53@hotmail.com>; Date: Thu, 24 Sep 2009 23:02:26 -0400; 4 hours _________________________________________________________________ Microsoft brings you a new way to search the web. Try Bing now http://www.bing.com?form=MFEHPG&publ=WLHMTAG&crea=TEXT_MFEHPG_; /archives//html/Amps/2009-09/msg00295.html (7,866 bytes)
3. Re: [Amps] Dimished Tube Life (score: 1): Author: "Mike" <noddy1211@sbcglobal.net>; Date: Thu, 24 Sep 2009 21:20:29 -0700; What a Crap answer, in reality nothing that you could even measure, don't even worry about it Mike 4 hours on my AL 1500 Amplifier, which uses the 8877 indirectly heated cathode tube when I come into; /archives//html/Amps/2009-09/msg00299.html (8,545 bytes)
4. Re: [Amps] Dimished Tube Life (score: 1): Author: Gary Patterson <gpatterson53@hotmail.com>; Date: Fri, 25 Sep 2009 04:11:42 -0400; "What a Crap answer" ...... What a thoughless response. Clearly, with the data given, as we take the limit of N with respect to tube usage the answer of 4 converges as the only logical answer. ______; /archives//html/Amps/2009-09/msg00300.html (10,783 bytes)
5. Re: [Amps] Dimished Tube Life (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Fri, 25 Sep 2009 16:55:11 +0800; Mike, The simple answer is that there are too many variables to say with any possible level of accuracy. Eventually that heater will stop boiling off electrons and the output will drop. But that coul; /archives//html/Amps/2009-09/msg00301.html (12,808 bytes)
6. [Amps] Dimished Tube Life (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 25 Sep 2009 11:05:38 +0000 (UTC); Hi Group, I've watched a few of these questions go by over the years, and it made me wonder. When is a tube considered at it's end of life? Of course a tube like I posted about last week, where the; /archives//html/Amps/2009-09/msg00308.html (9,466 bytes)
7. Re: [Amps] Dimished Tube Life (score: 1): Author: Dave white <mausoptik@btinternet.com>; Date: Fri, 25 Sep 2009 12:10:06 +0100; The answer at least made me laugh, As everyone is now saying, there are a zillion variables in play so it's a bit of an impossible question. What filament voltage? Filament soft start? Ht? Cooling? S; /archives//html/Amps/2009-09/msg00309.html (11,219 bytes)
8. [Amps] Dimished Tube Life (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Fri, 25 Sep 2009 06:42:45 -0700 (PDT); What kills tubes in the amateur service is turning the amp OFF - period... The absolute worst thing you can do is cycle the power... In my shack on weekends the amp is turned on on Friday night and; /archives//html/Amps/2009-09/msg00310.html (7,809 bytes)
9. Re: [Amps] Dimished Tube Life (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Fri, 25 Sep 2009 10:06:37 -0400; It is an answer from an engineer's mind that is complete correct and both provable and a "given." Nothing wears out things with more certainty that using them. If you don't understand this, read mor; /archives//html/Amps/2009-09/msg00311.html (9,170 bytes)
10. Re: [Amps] Dimished Tube Life (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Fri, 25 Sep 2009 07:43:36 -0800; Regarding 8877 tube life, I can tell you that in my working days we ran an 8877 amp at 250 watts output 24/7 for 15 years, without ever changing the tube. The amp was transmitting IRIG-B time code on; /archives//html/Amps/2009-09/msg00312.html (8,429 bytes)
11. Re: [Amps] Dimished Tube Life (score: 1): Author: donroden@hiwaay.net; Date: Fri, 25 Sep 2009 11:14:36 -0500; The most correct answer is : 4 hours Don WA4NPL _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-09/msg00313.html (10,917 bytes)
12. Re: [Amps] Dimished Tube Life (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Fri, 25 Sep 2009 09:30:32 -0700; Hats off to Messrs. Eitel & McCullough. Gary...wa6fgi Regarding 8877 tube life, I can tell you that in my working days we ran an 8877 amp at 250 watts output 24/7 for 15 years, without ever changing; /archives//html/Amps/2009-09/msg00314.html (9,387 bytes)
13. Re: [Amps] Dimished Tube Life (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Fri, 25 Sep 2009 14:01:04 -0700; ORIGINAL MESSAGE: REPLY: Do you see any difference between four hours with heater only or four hours running at full output? Are you saying it makes no difference? 73, Bill W6WRT ____________________; /archives//html/Amps/2009-09/msg00318.html (8,734 bytes)
14. [Amps] Dimished Tube Life (score: 1): Author: saul_abrams@dps.state.ny.us; Date: Fri, 25 Sep 2009 13:51:57 -0400; I may be mistaken, but I recall reading on the Alpha Radio site an answer to the question of when to turn off the amp. I think Alpha said that if you are not going to use the amp for an hour or more,; /archives//html/Amps/2009-09/msg00354.html (7,128 bytes)
15. Re: [Amps] Dimished Tube Life (score: 1): Author: saul_abrams@dps.state.ny.us; Date: Fri, 25 Sep 2009 17:42:29 -0400; Sorry, just checked--it was two hours or more, turn it off. Saul K2XA Saul Abrams/OGC/NYSDPS 09/25/2009 01:51 PM To amps@contesting.com cc Subject [Amps] Dimished Tube Life I may be mistaken, but I r; /archives//html/Amps/2009-09/msg00355.html (8,284 bytes)
16. Re: [Amps] Dimished Tube Life (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Tue, 29 Sep 2009 14:22:19 -0400; IIRC the Alphas all use Oxide coated, Indirectly heated cathodes which are not nearly as susceptible to the inrush current problem. OTOH that type takes a typical 3 minutes (give or take) to warm up.; /archives//html/Amps/2009-09/msg00358.html (7,656 bytes)

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