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1. [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Wed, 18 Mar 2020 10:33:46 -0500; Hello [Amps] Gurus, I had a failure of my Henry 2K-4. I am betting it is a well-known failure mode, and that multiple people on here, after hearing a description of what happened, will be able to te; /archives//html/Amps/2020-03/msg00072.html (8,560 bytes)
2. [Amps] Henry 2K-4 Failure (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 18 Mar 2020 09:09:32 -0700; <Hello [Amps] Gurus, <I had a failure of my Henry 2K-4.? I am betting it is a well-known <failure mode, and that multiple people on here, after hearing a <description of what happened, will be able t; /archives//html/Amps/2020-03/msg00073.html (6,873 bytes)
3. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>; Date: Wed, 18 Mar 2020 18:11:14 +0200; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2020-03/msg00074.html (6,822 bytes)
4. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Wed, 18 Mar 2020 15:45:48 -0500; Thanks ALL! I'll swap in a different set of tubes to confirm or rule out that it's one of the tubes. Then if it is a tube, I'll do them one at time to figure out which tube it is. Thanks for all the; /archives//html/Amps/2020-03/msg00075.html (9,961 bytes)
5. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Thu, 19 Mar 2020 08:09:23 +1000; Surely a meter, ohm checking the pin resistance between the cathode and grid will identify the problem tube ? Unless the short only occurs when hot. Adrian Fewster vk4tux I'll swap in a different set; /archives//html/Amps/2020-03/msg00076.html (8,198 bytes)
6. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: gudguyham--- via Amps <amps@contesting.com>; Date: Wed, 18 Mar 2020 22:52:47 +0000 (UTC); 99% of the time a short wont show with a meter in a cold tube. On rare cases yes. Surely a meter, ohm checking the pin resistance between the cathode and grid will identify the problem tube ? Unless; /archives//html/Amps/2020-03/msg00077.html (7,674 bytes)
7. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Thu, 19 Mar 2020 09:04:52 +1000; Ok on that, a 500v megger check would probably show it better. Sent from AOL Mobile Mail Get the new AOL app: mail.mobile.aol.com <http://mail.mobile.aol.com> Surely a meter, ohm checking the pin res; /archives//html/Amps/2020-03/msg00078.html (8,373 bytes)
8. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Jim <jimw7ry@gmail.com>; Date: Wed, 18 Mar 2020 18:17:36 -0500; Shorted tube. Grid to cathode (filament). Thanks 73 Jim W7RY I had a failure of my Henry 2K-4. I am betting it is a well-known failure mode, and that multiple people on here, after hearing a descrip; /archives//html/Amps/2020-03/msg00079.html (9,703 bytes)
9. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 19 Mar 2020 07:13:43 -0500; Thanks Gerald Actually easier to simply swap tubes than take amp apart enough to get at the socket pins? Mark Mark, Grid to cathode short & stayed failed means you just need an ohmmeter. No need to s; /archives//html/Amps/2020-03/msg00080.html (7,075 bytes)
10. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 19 Mar 2020 10:32:38 -0700; lit..... not when cold. When cold, both a HI pot tester.... and also a megger wont work either. Jim VE7RF _______________________________________________ Amps mailing list Amps@contesting.com http:/; /archives//html/Amps/2020-03/msg00081.html (6,941 bytes)
11. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Fri, 20 Mar 2020 08:17:51 +1000; Thanks Jim, you can't beat words from those experienced. I guess a cathode test plug could be made to substitute one tube plugging into the socket .A dead tube could have its base made up for this, w; /archives//html/Amps/2020-03/msg00082.html (8,137 bytes)
12. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 19 Mar 2020 19:31:09 -0500; This is getting more and more exciting all the time. Stay tuned. So to speak. 73 - Mark N5OT Hey Jim & Mark, Stayed failed to me means that the sucker is welded. How do I know this for certain ,you; /archives//html/Amps/2020-03/msg00083.html (8,204 bytes)
13. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 19 Mar 2020 20:19:30 -0500; I was not thinking about checking the continuity in the tubes themselves when I balked at opening up the amp deep enough to check the continuity at the sockets! I didn't connect those dots initially; /archives//html/Amps/2020-03/msg00084.html (9,639 bytes)
14. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: mark bitterlich <markbitterlich@embarqmail.com>; Date: Thu, 19 Mar 2020 21:32:24 -0400; Or you could try a new tube ...... -- Original message --From: Adrian <vk4tux@gmail.com> Date: 3/19/20 18:17 (GMT-05:00) To: Jim Thomson <jim.thom@telus.net>, amps@contesting.com Subject: Re: [Amps]; /archives//html/Amps/2020-03/msg00085.html (9,101 bytes)
15. [Amps] Henry 2K-4 Failure (score: 1): Author: john@kk9a.com; Date: Fri, 20 Mar 2020 07:43:40 -0500; What a quick and accurate response you got on AMPS to your 2K-4 issue! GL John KK9A I was not thinking about checking the continuity in the tubes themselves when I balked at opening up the amp deep e; /archives//html/Amps/2020-03/msg00086.html (7,602 bytes)
16. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 20 Mar 2020 07:16:49 -0700; Jim VE7RF Thanks Jim, you can't beat words from those experienced. I guess a cathode test plug could be made to substitute one tube plugging into the socket .A dead tube could have its base made up; /archives//html/Amps/2020-03/msg00087.html (9,558 bytes)
17. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Adrian <vk4tux@gmail.com>; Date: Sat, 21 Mar 2020 00:50:24 +1000; Yes I earlier divided 10 volts by 15 amps to get 0.666 series resistance divided by 2 (tubes) 1.5 ft 16 gauge nichrome coiled is a inexpensive option. Jim VE7RF Thanks Jim, you can't beat words fr; /archives//html/Amps/2020-03/msg00089.html (9,897 bytes)
18. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: mark bitterlich <markbitterlich@embarqmail.com>; Date: Fri, 20 Mar 2020 13:57:01 -0400; Nichrome wire would have to dissipate 75 watts of heat unless it was mounted on stand-offs with air flow. Otherwise that heat will go directly to the socket thus quickening their demise as they lose; /archives//html/Amps/2020-03/msg00090.html (10,711 bytes)
19. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Fri, 20 Mar 2020 14:45:12 -0500; Indeed, I was pretty sure this was a common set of symptoms. Two 3-500z tubes here are about as common as it gets. I was pleased that I'd recalled the pinout of this tube from 4 or 5 decades of memo; /archives//html/Amps/2020-03/msg00091.html (9,014 bytes)
20. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: RCM <robrk@nidhog.net>; Date: Fri, 20 Mar 2020 17:09:51 -0400; Plan ahead for the next time you have to pull the lid off. Im sitting here looking at a line voltage meter reading 125 volts. I wonder why? Maybe your electric bill is based on KWH. The house is the; /archives//html/Amps/2020-03/msg00092.html (8,403 bytes)

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