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1. [Amps] Series screen gate design help (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 14 Apr 2010 11:29:56 -0700; I want to update the old-fashioned clamp-tube circuit. I want to create a solid-state switch that will accept a voltage input (negative, but it can be inverted) derived from the rectified grid curren; /archives//html/Amps/2010-04/msg00454.html (7,871 bytes)
2. Re: [Amps] Series screen gate design help (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Wed, 14 Apr 2010 14:38:23 -0400; Vic: The slightest little arc in the tube, the tiniest little gassy discharge kind of event, would instantly destroy a series pass transistor. Instantly. I would think a shunt device (with a series b; /archives//html/Amps/2010-04/msg00455.html (7,354 bytes)
3. Re: [Amps] Series screen gate design help (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Wed, 14 Apr 2010 17:54:32 -0700 (PDT); Hi Vic, A power FET or an IGBT (with an internal or external diode) should do for that spot rather than an old bipolar device. At least a 600V device would be indicated. 600V IGBT's have become very; /archives//html/Amps/2010-04/msg00463.html (9,810 bytes)
4. Re: [Amps] Series screen gate design help (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Thu, 15 Apr 2010 02:04:54 +0000; I recommend taking the horizontal output transistor out of an old NTSC (analog) TV set. They are about 1,200 Volts at 6 or 7 amps, heat sunk. A single hi Voltage (Video output transistor) inverter an; /archives//html/Amps/2010-04/msg00464.html (7,719 bytes)
5. Re: [Amps] Series screen gate design help (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 14 Apr 2010 21:07:16 -0700; If I bias the tube for class C, then the keying envelope will get very sharp. It would be a click generator. What I'm thinking about now is having just enough fixed bias to barely cut the tube off (a; /archives//html/Amps/2010-04/msg00465.html (7,824 bytes)
6. Re: [Amps] Series screen gate design help (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Thu, 15 Apr 2010 20:22:30 +0000; It was also used in transmitters, such as my Heath DX-100. I became familiar with the clamp circuit (a 6AQ5) when I built a T-R switch on the Pi network and the electron noise from idling current was; /archives//html/Amps/2010-04/msg00474.html (8,904 bytes)

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