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1. [Amps] 4-1000A neutralization (score: 1): Author: kc0hfl@cox.net; Date: Thu, 3 Sep 2009 20:30:21 -0400 (EDT); I have completed my 2 tube 4-1000A amp but am experiencing self oscillation when I apply plate voltage. My question is do I need to add a neutralization capacitor in the plate line? I reviewed all th; /archives//html/Amps/2009-09/msg00028.html (6,745 bytes)
2. Re: [Amps] 4-1000A neutralization (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Thu, 03 Sep 2009 18:41:09 -0700; ORIGINAL MESSAGE: REPLY: The first question is what is the frequency of the oscillation? Grounded grid tubes rarely oscillate at the operating frequency. Most likely you have a VHF parasitic, in whic; /archives//html/Amps/2009-09/msg00029.html (7,375 bytes)
3. Re: [Amps] 4-1000A neutralization (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Fri, 4 Sep 2009 09:52:38 -0500; Thanks to all for the replies. I have not measured the frequency of the oscillation as of yet. The sockets I am using are the plastic Eimac and the grid/screen pins are tied to ground using one piece; /archives//html/Amps/2009-09/msg00042.html (11,413 bytes)
4. Re: [Amps] 4-1000A neutralization (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Fri, 04 Sep 2009 09:33:09 -0700; ORIGINAL MESSAGE: REPLY: I would add that now. That will greatly reduce the input impedance at VHF and may be all you need to stop the oscillation. A simple LC parallel resonant tank with a Q of thre; /archives//html/Amps/2009-09/msg00043.html (7,785 bytes)
5. Re: [Amps] 4-1000A neutralization (score: 1): Author: "alexeban" <alexeban@gmail.com>; Date: Sat, 5 Sep 2009 15:09:15 +0300; The suppressor seems too small to me! I would expect to see about 2 to 4 turns of that copper strap, about 1 inch in diameter. As for the oscillation frequency, an educated guess would be 80-90 MHz,; /archives//html/Amps/2009-09/msg00045.html (12,596 bytes)
6. Re: [Amps] 4-1000A neutralization (score: 1): Author: donroden@hiwaay.net; Date: Sat, 05 Sep 2009 11:48:38 -0500; Not to mention heat radiation between tubes. A black shield will help keep 'em cool. Don WA4NPL _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont; /archives//html/Amps/2009-09/msg00048.html (7,245 bytes)

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