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Total 31 documents matching your query.

21. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: donroden@hiwaay.net; Date: Mon, 27 Jul 2015 15:57:25 -0500; The 640 Socket does not have the built-in screen bypass. It has only one screen lead unlike the 630 that has several screen bypass connections . E F Johnson sold a screen shield ring that worked Well; /archives//html/Amps/2015-07/msg00164.html (16,136 bytes)
22. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Mon, 27 Jul 2015 16:56:39 -0700; -- ORIGINAL MESSAGE --(may be snipped) -- ORIGINAL MESSAGE --(may be snipped) REPLY: I see a potential problem with that. Having only the single variable capacitor will case a phase shift when adjust; /archives//html/Amps/2015-07/msg00165.html (10,430 bytes)
23. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: donroden@hiwaay.net; Date: Mon, 27 Jul 2015 20:14:33 -0500; REPLY: I see a potential problem with that. Having only the single variable capacitor will case a phase shift when adjusting it. By comparison the bridge neutralization circuit with it's two voltage; /archives//html/Amps/2015-07/msg00166.html (10,379 bytes)
24. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: "Dick Hanson" <dick@dkhanson.com>; Date: Mon, 27 Jul 2015 20:18:51 -0500; RF grounded screens (Eimac socket WITH bypass) + total 10K resistor(s) hung from screen to ground + swamped grid circuit = don't need no stinkin neutralization. Period. Especially at 6m. 73 Dick, K5A; /archives//html/Amps/2015-07/msg00167.html (10,864 bytes)
25. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Tue, 28 Jul 2015 06:58:30 +0300; I suggested to the original poster that he make it a swamped class AB1 amplifier. He will get plenty of drive with a 50-ohm swamping resistor. The only tuning he needs is a small coil to balance out; /archives//html/Amps/2015-07/msg00168.html (11,109 bytes)
26. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>; Date: Tue, 28 Jul 2015 06:59:20 +0300; Great minds think alike! 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ 73 Dick, K5AND REPLY: I see a potential problem with that. Having only the single variable capacitor will case; /archives//html/Amps/2015-07/msg00169.html (11,510 bytes)
27. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: Roger <ai7rogerroger@gmail.com>; Date: Mon, 27 Jul 2015 21:15:34 -0700; "I suggested to the original poster that he make it a swamped class AB1 amplifier. He will get plenty of drive with a 50-ohm swamping resistor. The only tuning he needs is a small coil to balance out; /archives//html/Amps/2015-07/msg00170.html (11,932 bytes)
28. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 28 Jul 2015 01:01:33 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: Agreed. I recall from an ARRL handbook 40 years ago that a .001 uF disk ceramic cap with leads about 1/2 inch was series resonant at six meters. Excellen; /archives//html/Amps/2015-07/msg00171.html (10,324 bytes)
29. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: "sm0aom@telia.com" <sm0aom@telia.com>; Date: Tue, 28 Jul 2015 10:27:10 +0200 (CEST); Series-resonant screen bypassing works, and was not unusual in the days of the 4-125A or 4-250A 50 and 144 MHz amplifiers. It can however be difficult to adjust especially if there are 4 tubes. 73/ K; /archives//html/Amps/2015-07/msg00172.html (10,932 bytes)
30. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: "Jim W7RY" <w7ry@centurytel.net>; Date: Tue, 28 Jul 2015 06:02:42 -0700; The Collins 30S-1 also used grounded screen and was neutralized. 73 Jim W7RY --Original Message-- From: sm0aom@telia.com Sent: Monday, July 27, 2015 1:49 PM To: mike@tubby.org Cc: amps@contesting.com; /archives//html/Amps/2015-07/msg00173.html (18,943 bytes)
31. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: "sm0aom@telia.com" <sm0aom@telia.com>; Date: Tue, 28 Jul 2015 15:29:54 +0200 (CEST); The 30S-1 is grounded-grid, not only grounded-screen, and also is cathode-driven. It uses RF negative feedback which is a very different animal compared to neutralization. The preivously referenced C; /archives//html/Amps/2015-07/msg00174.html (21,378 bytes)

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