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1. [Amps] Transistor amps (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Mon, 28 Mar 2005 20:08:52 -0500; This is something I have thought of for years and never looked into it. Could an amp be built using horizontal output transistors where the voltage can be ran up to keep the current down? I wonder if; /archives//html/Amps/2005-03/msg00642.html (7,023 bytes)
2. Re: [Amps] Transistor amps (score: 1): Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>; Date: Mon, 28 Mar 2005 19:38:41 -0600; Frequency response rolls off too much for those transistors. They were made to work below 2 mhz. HOWEVER, there are the high voltage mosfets from Advanced Power Technology that work in the 300-1,200; /archives//html/Amps/2005-03/msg00647.html (8,526 bytes)
3. Re: [Amps] Transistor amps (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Mon, 28 Mar 2005 21:54:31 -0500; William, If things convert over to solid state, that is what's needed, a high voltage semiconductor. This I am interested in and wouldn't mind building a prototype. One thing about mosfets I was told; /archives//html/Amps/2005-03/msg00652.html (9,849 bytes)
4. Re: [Amps] Transistor amps (score: 1): Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>; Date: Tue, 29 Mar 2005 01:07:33 -0600; Check these out... I just uploaded them to my website. They make fine CW amps... need a little work for SSB... but not much! http://www.wjschmidt.com/ham/apt9502.pdf http://www.wjschmidt.com/ham/apt9; /archives//html/Amps/2005-03/msg00662.html (11,974 bytes)
5. Re: [Amps] Transistor amps (score: 1): Author: Tony King - W4ZT <amps@w4zt.com>; Date: Tue, 29 Mar 2005 03:16:59 -0500; Those are very interesting! I noticed that the 9701 paper mentioned an interesting problem in the input circuit relating to the wild excursions of input impedance and the fact that, under some condit; /archives//html/Amps/2005-03/msg00666.html (13,351 bytes)
6. Re: [Amps] Transistor amps (score: 1): Author: "Bert" <balmemo@sympatico.ca>; Date: Tue, 29 Mar 2005 09:44:54 -0500; Very interesting!! Solid state is the way to go. 73s Bert, VE3OBU Check these out... I just uploaded them to my website. They make fine CW amps... need a little work for SSB... but not much! http://w; /archives//html/Amps/2005-03/msg00675.html (12,216 bytes)
7. Re: [Amps] Transistor amps (score: 1): Author: Richard Measures <r@somis.org>; Date: Tue, 29 Mar 2005 07:35:25 -0800; Solid state will Definitely be the way to go when carbon-crystal transistors are commonplace. Who knows?, maybe they will even have an efficiency as high as 60%! Rich Measures, 805.386.3734, AG6K, ww; /archives//html/Amps/2005-03/msg00677.html (13,941 bytes)
8. Re: [Amps] Transistor amps (score: 1): Author: Richard Measures <r@somis.org>; Date: Tue, 29 Mar 2005 08:19:51 -0800; Horizontal output transistors are switches. They can carry current or voltage, but not very well at the same instant because of secondary-breakdown. Rich Measures, 805.386.3734, AG6K, www.somis.org _; /archives//html/Amps/2005-03/msg00682.html (8,378 bytes)
9. Re: [Amps] Transistor amps (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 29 Mar 2005 08:39:25 -0800; The notes don't discuss protective circuitry, if needed. You might want to protect it from high SWR, overdrive, high temperature, and overcurrent. Every time I talk to anyone 'in the business' about; /archives//html/Amps/2005-03/msg00687.html (9,442 bytes)
10. Re: [Amps] Transistor amps (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 29 Mar 2005 17:49:00 +0100; 60+% is easy with semiconductors, provided you're not trying to do it over 4 octaves 'no tune'. Same as a tube, really :-) Steve _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2005-03/msg00690.html (8,058 bytes)
11. Re: [Amps] Transistor amps (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 29 Mar 2005 11:12:24 -0500; I noticed that the efficiency of the 13.56 MHz amplifier is 85% max and the 27.12 MHz is 78%. Dropping down rapidly at higher frequencies. But all this efficiency would be lost if you linearize the a; /archives//html/Amps/2005-03/msg00693.html (14,591 bytes)
12. Re: [Amps] Transistor amps (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Tue, 29 Mar 2005 14:27:42 -0500; That's what I was wondering as I never did check the specks on any. I just remembered it in a flash and posted about it. Thanks for the replies from all, it let me know what I wanted. Best, Will ** R; /archives//html/Amps/2005-03/msg00697.html (9,598 bytes)
13. Re: [Amps] Transistor amps (score: 1): Author: Bill NY9H <ny9h@arrl.net>; Date: Wed, 06 Apr 2005 09:38:45 -0500; I don't know what Harris uses in their DX series of solid state devices... Here is a site that shows the same module's used at WLS Chicago... it's about 3/4 down the url... http://hawkins.pair.com/wc; /archives//html/Amps/2005-04/msg00125.html (7,638 bytes)
14. Re: [Amps] Transistor amps (score: 1): Author: "Carcia, Francis A HS" <francis.carcia@hs.utc.com>; Date: Wed, 6 Apr 2005 10:42:27 -0400; I think the DX50 used IRF350s which are pigs at HF. I don't know what Harris uses in their DX series of solid state devices... Here is a site that shows the same module's used at WLS Chicago... it's; /archives//html/Amps/2005-04/msg00126.html (7,437 bytes)

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