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1. Re: [Amps] Alpha vs. Henry (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sun, 3 Apr 2011 11:32:54 -0500; <<<I owned a Henry 5K Classic X with a pair of 8877's. Bought it new from Henry in 2000. Very good amp but when pushed the tuned input plate choke would start to scream. >>> What's a "tuned input pla; /archives//html/Amps/2011-04/msg00024.html (7,139 bytes)
2. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 3 Apr 2011 12:48:09 -0400; Tuned PS filter choke Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-04/msg00025.html (7,929 bytes)
3. Re: [Amps] Alpha vs. Henry (score: 1): Author: Damon Stewart <wsmc551@gmail.com>; Date: Sun, 03 Apr 2011 09:51:35 -0700; Sorry, maybe I didn't use the proper terminology. The HV power supply in the Henry used a oil filled cap and a large input choke (looks like another large transformer). After a brief search looks lik; /archives//html/Amps/2011-04/msg00027.html (7,893 bytes)
4. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Sun, 03 Apr 2011 14:42:16 -0400; I had a 2K4 that would get pretty noisy when loaded to tilt as well. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2011-04/msg00034.html (7,518 bytes)
5. Re: [Amps] Alpha vs. Henry (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Sun, 03 Apr 2011 12:23:35 -0700; I have a 3KA that "talks" under high drive levels and I've wondered if it was the PS choke. Never worked up the motivation to try to isolate it, though. I wonder (yet again) if that says anything abo; /archives//html/Amps/2011-04/msg00039.html (8,177 bytes)
6. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 3 Apr 2011 15:31:24 -0400; Chokes dont like a heavy current with lots of ripple on it. Same with a modulation xfmr that passes DC in the secondary, they like to talk back to you. Carl KM1H _____________________________________; /archives//html/Amps/2011-04/msg00041.html (8,393 bytes)
7. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Sun, 3 Apr 2011 12:49:35 -0700; No.. The proper name is the plate power supply FILTER choke. 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/list; /archives//html/Amps/2011-04/msg00043.html (9,652 bytes)
8. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Fern" <crc@cyberlink.bc.ca>; Date: Sun, 3 Apr 2011 13:45:06 -0600; I have two Henry amps with the 3K Classic and 3K Premiere (both export versions) without that issue of choke talking back. I suspect that his choke and capacitor may be off resonance. Fern VE7GZ ____; /archives//html/Amps/2011-04/msg00045.html (9,060 bytes)
9. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 3 Apr 2011 19:13:48 -0400; The choke/capacitor combination should be resonant at 15-20% above 120 Hz. When the choke lets loose I dont know what the failure mode is but Henry amps do it often. Poor manufacturing tolerance on t; /archives//html/Amps/2011-04/msg00049.html (9,942 bytes)
10. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 3 Apr 2011 21:00:39 -0400; Not according to Collins. They say that the choke should be resonant at 120 Hz with minimum critical current, eg bleeder current, which keeps voltage from soaring. As current draw increases the induc; /archives//html/Amps/2011-04/msg00052.html (11,916 bytes)
11. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 3 Apr 2011 21:28:35 -0400; Where does Collins say that and use it? Or are they just quoting old HB tripe or is it vice versa? I suppose that with components that are sized for the peak voltages encountered it might work but th; /archives//html/Amps/2011-04/msg00056.html (12,917 bytes)
12. [Amps] Alpha vs. Henry (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sun, 03 Apr 2011 20:10:19 -0600; The Broadcast Electronics FM transmitter power supplies for 1-3.5 kW tubes and single phase power used a polypropylene capacitor and a choke designed to be in parallel resonance at low current, to pr; /archives//html/Amps/2011-04/msg00058.html (10,314 bytes)
13. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 3 Apr 2011 22:26:07 -0400; I think that it was in the Collins Fundamentals of single side band. I looked again briefly and didn't see it so it might have been in another of their publications. By the way this book is an excell; /archives//html/Amps/2011-04/msg00061.html (15,104 bytes)
14. [Amps] Alpha vs. Henry (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 4 Apr 2011 03:17:55 -0700; Not according to Collins. They say that the choke should be resonant at 120 Hz with minimum critical current, eg bleeder current, which keeps voltage from soaring. As current draw increases the induc; /archives//html/Amps/2011-04/msg00076.html (10,688 bytes)
15. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 4 Apr 2011 08:45:48 -0400; Collins included that book with the URC-32 docs. I still have it from my 60's Navy days. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c; /archives//html/Amps/2011-04/msg00079.html (15,976 bytes)
16. Re: [Amps] Alpha vs. Henry (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 4 Apr 2011 16:18:58 -0400; The choke needs to be resonant at 120 Hz with only bleeder current, not higher in frequency. Yes there are very high voltages across the choke at resonance. You need a very good cap and voltage capab; /archives//html/Amps/2011-04/msg00132.html (13,059 bytes)

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