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1. [Amps] Novel Screen Grid Regulator (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Thu, 27 Sep 2012 08:48:50 -0600; Hi Gang, I'm designing a 160m monoband amplifier using three GU-74B tetrodes and thought a few of you might be interested in reading about a clever screen grid voltage regulator circuit I stumbled ac; /archives//html/Amps/2012-09/msg00305.html (12,899 bytes)
2. Re: [Amps] Novel Screen Grid Regulator (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 27 Sep 2012 12:52:18 -0400; Jim, Very interesting circuit since the MOSFETs function like a high-power, active voltage divider. I did note that the non-inverting input to U1a may be susceptible to the effects of both the normal; /archives//html/Amps/2012-09/msg00307.html (7,902 bytes)
3. Re: [Amps] Novel Screen Grid Regulator (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Thu, 27 Sep 2012 21:07:01 +0200; Jim, I made (and used for my current 160mtrs tetrode th289 amp) almost the same for grid supply. But will work also good for positive screen supply (use NPN and reverse diodes). http://www.pc5m.net/p; /archives//html/Amps/2012-09/msg00310.html (14,550 bytes)
4. Re: [Amps] Novel Screen Grid Regulator (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 29 Sep 2012 10:15:11 -0400; Ive been using the IXCP0M90S, good to 900V at 1-100ma. Keeps those sensitive screen grids safe from over current or collateral damage when there is an internal failure. It does keep 8122's happy in m; /archives//html/Amps/2012-09/msg00313.html (8,949 bytes)
5. Re: [Amps] Novel Screen Grid Regulator (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Sat, 29 Sep 2012 11:25:19 -0600; Thanks for your comments, Paul, Carel, and Carl. I think a zener across the + input is a good suggestion, Paul. I hadn't worried about protecting the op amp because the 50:1 voltage divider would red; /archives//html/Amps/2012-09/msg00314.html (11,078 bytes)
6. Re: [Amps] Novel Screen Grid Regulator (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 30 Sep 2012 11:32:06 -0400; Its IXCP10M90S Jim, sorry about that! http://ixdev.ixys.com/DataSheet/DS98729A(IXCP-CY10M90S).pdf Carl Thanks for your comments, Paul, Carel, and Carl. I think a zener across the + input is a good su; /archives//html/Amps/2012-09/msg00318.html (13,517 bytes)

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