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1. [Amps] Plate Cap Quandary (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 3 Aug 2011 09:18:45 -0700 (PDT); I'm contemplating a single 4CX350FJ (Cout = 7pF) amplifier for 250 watts on HF where the plate impedance, at 2200 volts, figures to be 5000 ohms and requires a (total) plate C circa 15pF on 10 meters; /archives//html/Amps/2011-08/msg00001.html (7,142 bytes)
2. [Amps] Plate Cap Quandary (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 3 Aug 2011 14:38:47 -0700; I'm contemplating a single 4CX350FJ (Cout = 7pF) amplifier for 250 watts on HF where the plate impedance, at 2200 volts, figures to be 5000 ohms and requires a (total) plate C circa 15pF on 10 meters; /archives//html/Amps/2011-08/msg00002.html (7,962 bytes)
3. Re: [Amps] Plate Cap Quandary (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 3 Aug 2011 20:31:26 -0400; Simply wind the 10M coil as per the software program using your favorite Q while ignoring any C. Then center tap that coil with the Tune C; it will be 4X ratio so now you need 4X the C to resonate. T; /archives//html/Amps/2011-08/msg00003.html (9,501 bytes)
4. Re: [Amps] Plate Cap Quandary (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 06 Aug 2011 02:12:00 +0000; Hi Carl, Marv, I was about to suggest to simply reverse the order of things, and do this: 1) add up the tube's capacitance, stray capacitance, and minimum capacitance of the plate tuning cap; 2) Calc; /archives//html/Amps/2011-08/msg00010.html (8,061 bytes)
5. Re: [Amps] Plate Cap Quandary (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Sat, 06 Aug 2011 11:39:58 -0700; I wasn't paying attention when the beginning of the thread marched by, thus the bad timing. So: center-tap the 10m coil with the Tune C, then just leave the "left-hand" end open? The YC156 suffers fr; /archives//html/Amps/2011-08/msg00015.html (9,414 bytes)
6. Re: [Amps] Plate Cap Quandary (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 6 Aug 2011 18:45:34 -0400; The full thread is in the archives. No it goes to the tube. Its especially helpful with that and similar tubes and since a vacuum cap is needed the min C is a bit less. The MRI amps operate close to; /archives//html/Amps/2011-08/msg00016.html (11,009 bytes)
7. [Amps] Plate Cap Quandary (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sun, 7 Aug 2011 04:54:52 -0700; Date: Sat, 06 Aug 2011 11:39:58 -0700 From: Jim Barber <audioguy@q.com> Subject: Re: [Amps] Plate Cap Quandary To: Manfred Mornhinweg <manfred@ludens.cl> Cc: amps@contesting.com Message-ID: <4E3D8A7E; /archives//html/Amps/2011-08/msg00018.html (11,906 bytes)
8. Re: [Amps] Plate Cap Quandary (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 7 Aug 2011 09:11:03 -0400; The C1 tap can be most anyplace on the coil, and the ratio will increase the more you move the tap towards the output side. Ive found the midpoint or a bit less to be a good compromise between a usea; /archives//html/Amps/2011-08/msg00019.html (14,088 bytes)
9. Re: [Amps] Plate Cap Quandary (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Sun, 07 Aug 2011 12:47:22 -0700; Thanks, Jim. And by using two coils (as you mention) I could keep the big roller in place that I bought for the purpose. OTOH, using NOS vacuum relays instead is looking more attractive in case I dec; /archives//html/Amps/2011-08/msg00020.html (13,884 bytes)

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