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1. [Amps] Doorknob Caps Needed: Background (score: 1): Author: RICHARD SOLOMON <w1ksz@q.com>; Date: Thu, 28 May 2009 04:31:49 +0000; Let me back up a tad on this. I am converting an SB-220 to 6 Meters. One of the questions I have is about the Plate Coupling Cap value. I see values of anywhere from 100 pF to 1,000 pF used. There mu; /archives//html/Amps/2009-05/msg00235.html (7,382 bytes)
2. Re: [Amps] Doorknob Caps Needed: Background (score: 1): Author: "David Craig" <davidhcraig@verizon.net>; Date: Thu, 28 May 2009 00:56:11 -0400; Dick, many use the stock 1000pf cap. I do too, but it makes me quezy as the RF current rating is being taxed or probably exceeded. That said, if you need a new one a 200pf 15kv would be ideal if you; /archives//html/Amps/2009-05/msg00236.html (8,588 bytes)
3. Re: [Amps] Doorknob Caps Needed: Background (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 27 May 2009 22:41:44 -0700; ORIGINAL MESSAGE: <snip> REPLY: The value of the coupling cap is probably the least critical of any capacitor in the entire amplifier. Its current and voltage rating must be equal to the task, but th; /archives//html/Amps/2009-05/msg00237.html (7,834 bytes)
4. Re: [Amps] Doorknob Caps Needed: Background (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Thu, 28 May 2009 08:56:45 -0400; The capacitor must have sufficient current carrying ability and DC Voltage hold off ability and a low enough impedance (compared to the impedance of the tube/s and the input of the output network) t; /archives//html/Amps/2009-05/msg00240.html (8,113 bytes)
5. Re: [Amps] Doorknob Caps Needed: Background (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Thu, 28 May 2009 10:29:03 -0700 (PDT); Hi Dick, <snip> <snip> A good "rule of thumb" is 4X the tune capacitance. The value is not at all critical. 100pF, or thereabouts, will be fine for 6 meters with your pair of 3-500's. There are some; /archives//html/Amps/2009-05/msg00245.html (8,320 bytes)
6. Re: [Amps] Doorknob Caps Needed: Background (score: 1): Author: "Barrie Smith" <barrie@centric.net>; Date: Thu, 28 May 2009 11:38:30 -0700; As a vague rule-of-thumb, the value of the plate blocking cap should be 4 to 5 times the value of the tune cap at resonance for the frequency in use. That would indicate 100 to 150 pf for 6M. I use a; /archives//html/Amps/2009-05/msg00246.html (10,704 bytes)

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