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Total 7 documents matching your query.

1. [AMPS] 4-250A (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 16 Jul 1997 17:04:00 +0100; rich asks: It peaks about 25mA, as I remember it. As the amp was built for AB1, and changed after I put a spec an on it and had a fit, I don't have a grid current meter. It has negative feedback with; /archives//html/Amps/1997-07/msg00110.html (7,130 bytes)
2. [AMPS] 4-250A (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 18 Jul 97 06:49:22 -0700; result in a substantive bend in the constant-current curves for the grid-driven configuration. The flatter the curve, the less distortion. It seems to me that putting a cathode RF negative feedback; /archives//html/Amps/1997-07/msg00124.html (7,334 bytes)
3. [Amps] 4-250A (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 25 Aug 2004 10:13:52 +0100; I've come across some of these tubes - are they useful as spares for any commercial kit? Do they have any particular vices or virtues? Thanks, Steve _______________________________________________ Am; /archives//html/Amps/2004-08/msg00286.html (6,584 bytes)
4. Re: [Amps] 4-250A (score: 1): Author: peter.chadwick@Zarlink.Com; Date: Wed, 25 Aug 2004 10:20:29 +0100; 4-250A. Spares for British Army D13 transmitter also Marconi NT201 naval tx. Nice tubes, I use a pair of them, theyglow a nice red at full dissipation, go nicely with 3600 or so on the anode. Design; /archives//html/Amps/2004-08/msg00287.html (7,218 bytes)
5. Re: [Amps] 4-250A (score: 1): Author: "W.F van Wyk" <zs6arf@telkomsa.net>; Date: Sun, 2 Jul 2006 08:30:59 +0200; Hi Bob, Thank you for your sane reply affirming exactly what I have been doing in my use of the 4-250A. I always take what is presented on this site and do my best to eliminate the technical extreme; /archives//html/Amps/2006-07/msg00035.html (8,323 bytes)
6. [Amps] 4-250a (score: 1): Author: JamesHorne <hornej@sasktel.net>; Date: Thu, 22 Jan 2009 13:54:48 -0600; Hello: Presently using a pair of 4-250a in hb linear. have two questions about these tubes. 1.. I understand that the 4-250a and 4-400 are identical electrically, and differ only in the dissipation r; /archives//html/Amps/2009-01/msg00244.html (7,051 bytes)
7. Re: [Amps] 4-250a (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 22 Jan 2009 17:44:14 -0500; The link says that ~2500V is the best point for AB1 in modulator service with a slight decrease at 3kV. http://tubes.mkdw.net/sheets/088/4/4-250A.pdf Without full testing its hard to say if there wou; /archives//html/Amps/2009-01/msg00245.html (8,878 bytes)

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