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Total 17 documents matching your query.

1. [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Brett Sims <brett@simsranch.com>; Date: Sat, 21 Aug 2021 21:24:46 -0500 (CDT); I have three used 3-500Z tubes I'd like to test. Can I safely test them one at a time in a Henry 2K? My thought is this will allow me to better classify each tube individually and perhaps better matc; /archives//html/Amps/2021-08/msg00056.html (7,455 bytes)
2. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Donald Fox via Amps <amps@contesting.com>; Date: Sun, 22 Aug 2021 02:30:18 +0000 (UTC); Brett: Henry tended to run the filaments in their 3-500z amps in series. The upside is a lower current filament circuit, The downside of course, is you can't run only 1 tube at a time. Don N8ECH On S; /archives//html/Amps/2021-08/msg00057.html (8,282 bytes)
3. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: David Gow <6146guy@gmail.com>; Date: Sat, 21 Aug 2021 19:40:39 -0700; The Henry 2K series amplifiers have the filaments in series so yuoust always have two tubes in the amp.. The manual explains why Henry made this choice. You can test a tube by having one known good t; /archives//html/Amps/2021-08/msg00058.html (8,092 bytes)
4. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Sun, 22 Aug 2021 07:58:30 -0400; Well... My 2K (original) is wired in parallel. It is also designed for 3-400's and won't accept a 3-500 unless you change the chimneys and change the heat dissipation caps to low profile ones or lowe; /archives//html/Amps/2021-08/msg00062.html (9,211 bytes)
5. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Sun, 22 Aug 2021 10:52:28 -0400; He may be thinking of the Kenwood TL-922 Carl -- Original Message -- Well... My 2K (original) is wired in parallel. It is also designed for 3-400's and won't accept a 3-500 unless you change the chim; /archives//html/Amps/2021-08/msg00063.html (10,424 bytes)
6. [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Donald Fox via Amps <amps@contesting.com>; Date: Sun, 22 Aug 2021 16:25:26 +0000 (UTC); Carl, et al: Has anyone contemplated what it would take to create a "dummy" 3-500 for testing in cases like this? Something along the lines of a 3-500 base, with an appropriate resistor (or group of; /archives//html/Amps/2021-08/msg00064.html (8,555 bytes)
7. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: David Gow <6146guy@gmail.com>; Date: Sun, 22 Aug 2021 09:33:14 -0700; Sorry, the 2K-2 on BAMA with 3-400Z tubes shows series filaments.. I don't have the original 2K manual and made an assumption. Dave W7VM _______________________________________________ Amps mailing l; /archives//html/Amps/2021-08/msg00065.html (11,001 bytes)
8. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Joe <nss@mwt.net>; Date: Sun, 22 Aug 2021 11:33:40 -0500; Using OHMS law, that would be a resistor of 0.35211 Ohms, and 71 watts, YIKES! Joe WB9SBD Has anyone contemplated what it would take to create a "dummy" 3-500 for testing in cases like this? Somethi; /archives//html/Amps/2021-08/msg00066.html (9,032 bytes)
9. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Sun, 22 Aug 2021 12:41:40 -0400; How about removing one plate cap? Every 2x 3-500 amp Ive tried has enough tank circuit tuning range to use on 40 and 20 and dont worry about the Q. Just remember to reduce drive power. Carl Carl, et; /archives//html/Amps/2021-08/msg00067.html (9,674 bytes)
10. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Donald Fox via Amps <amps@contesting.com>; Date: Sun, 22 Aug 2021 17:14:07 +0000 (UTC); Re removing a plate cap for one of the tubes, that occurred to me. My concern was could the grid on the disconnected tube be damaged by applying drive without plate voltage? My worry there arises fro; /archives//html/Amps/2021-08/msg00069.html (8,776 bytes)
11. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: "Bob D." <ajamas.rn@gmail.com>; Date: Sun, 22 Aug 2021 14:55:00 -0400; Mike! My 1960's 2K, original owner K2GL, also has heaters in parallel. 73, -bob ah7i -- -do not look into LASER with remaining eye! _______________________________________________ Amps mailing list A; /archives//html/Amps/2021-08/msg00070.html (8,035 bytes)
12. [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Brett Sims <brett@simsranch.com>; Date: Sun, 22 Aug 2021 21:02:19 -0500 (CDT); Appreciate the responses. My Henry 2K also has the filaments in parallel. Your right, it was originally designed for 3-400's. I failed to mention in my original post, it was upgraded to 3-500's with; /archives//html/Amps/2021-08/msg00071.html (10,034 bytes)
13. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 22 Aug 2021 19:47:41 -0700; I could certainly do with my Ten Tec Titan 425, and it worked very well for that. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte; /archives//html/Amps/2021-08/msg00072.html (8,921 bytes)
14. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Donald Fox via Amps <amps@contesting.com>; Date: Mon, 23 Aug 2021 02:48:27 +0000 (UTC); Brett: In that case, I think you will be fine. The tuning will be a bit off of course, due to the missing tube. I have done the same thing here with my Commander 2500 when evaluating a number of 3CX8; /archives//html/Amps/2021-08/msg00073.html (9,147 bytes)
15. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Mon, 23 Aug 2021 07:47:08 -0400; Yes you can. You need to keep the drive way down and keep grid and plate currents at half normal IF YOU CAN LOAD IT PROPERLY which is questionable. I ran mine with one of the 3-400's dead without kno; /archives//html/Amps/2021-08/msg00074.html (10,722 bytes)
16. Re: [Amps] Testing Tubes with a Henry 2K (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Mon, 23 Aug 2021 12:50:23 -0400; As amp/vintage TX repair is a part time business here since the 60's Ive tested a single tube in a two and three tube amp from a 807's to 8877's. Metal or glass, triode, tetrode, and pentode, they al; /archives//html/Amps/2021-08/msg00075.html (10,974 bytes)
17. [Amps] Testing Tubes with a Henry 2K (score: 1): Author: Brett Sims <brett@simsranch.com>; Date: Mon, 23 Aug 2021 19:32:08 -0500 (CDT); Looks like the consensus thinks I should give it a try... So I will. Thanks for the help and advice. Brett ____________________________________________________________________________________________; /archives//html/Amps/2021-08/msg00076.html (8,199 bytes)

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