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1. [AMPS] Amps in Sept QST (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Tue, 26 Aug 1997 15:28:51 EDT; The Product Reviews of the Alpha 91b and the QRO 2500DX merit reading since these are the first with the Svetlana 4CX800/GU-74B tetrodes. To be honest, I am amazed at the IMD performance of both amps; /archives//html/Amps/1997-08/msg00186.html (9,051 bytes)
2. [AMPS] Amps in Sept QST (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 26 Aug 97 15:27:48 -0800; That's probably better IMD performance than any transceiver, Carl. However, a 4CX250B with 10 ohms of cathode RF negative feedback R, loaded to 5mA of screen current, has IMD performance that is com; /archives//html/Amps/1997-08/msg00187.html (8,723 bytes)
3. [AMPS] Amps in Sept QST (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Tue, 26 Aug 1997 19:28:37 EDT; Unfortunately most 4CX250 sockets have the cathode pin internally grounded to the mounting ring precluding any changes. Alpha had a screen circuit ( not tube) problem, QRO blew a 4:1 output matching; /archives//html/Amps/1997-08/msg00188.html (9,174 bytes)
4. [AMPS] Amps in Sept QST (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 26 Aug 1997 21:38:37 +0000; To: <amps@contesting.com> Not by as much as you think. All Eimac and commercial specs use dB below ONE TONE while the ARRL uses dB below PEP. So the numbers are really: AL800H -43 dB third order, -4; /archives//html/Amps/1997-08/msg00190.html (9,252 bytes)
5. [AMPS] Amps in Sept QST (score: 1): Author: rhill@htonline.com (rhill); Date: Wed, 27 Aug 1997 00:52:15 -0400; I can say that my 91b never failed either, at least since I purchased it back in May. Quite and fun to use. AS for the QST article: "During a contest, it suffered a component failure in the screen su; /archives//html/Amps/1997-08/msg00192.html (8,828 bytes)
6. [AMPS] Amps in Sept QST (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 27 Aug 97 01:59:01 -0800; .......snip....... Fortunately, the rivets that ground the cathode pins are simple to remove. Thanks for the info on the failures. Rich-- R. L. Measures, 805-386-3734, AG6K -- FAQ on WWW: http://www; /archives//html/Amps/1997-08/msg00195.html (8,409 bytes)
7. [AMPS] Amps in Sept QST (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Wed, 27 Aug 1997 09:22:53 EDT; On Tue, 26 Aug 1997 21:38:37 +0000 w8jitom@postoffice.worldnet.att.net writes: To: <amps@contesting.com> Tnx for reminding me about that little ARRL anamoly. The 4CX250 runs anywhere from 25 to 28 3r; /archives//html/Amps/1997-08/msg00199.html (10,898 bytes)
8. [AMPS] Amps in Sept QST (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 27 Aug 1997 10:17:53 +0000; Hi Carl, I wish the ARRL would go back to the same standard the rest of the world uses. In a phone conversation, they said IMD deteriorated to the 30 odd dB range. They measured IMD on 14 MHz, and on; /archives//html/Amps/1997-08/msg00203.html (9,066 bytes)
9. [AMPS] Amps in Sept QST (score: 1): Author: gdaught6@leland.Stanford.EDU (George T. Daughters); Date: Wed, 27 Aug 1997 08:57:31 +0008; hi tom, pretty non-conventional, but the plate tank (pi circuit) matches from the anode level down to 200 ohms, then the transformer gets you down to 50, nominal. at the very leaset, it means you don; /archives//html/Amps/1997-08/msg00205.html (8,424 bytes)
10. [AMPS] Amps in Sept QST (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Wed, 27 Aug 1997 12:20:16 EDT; On Wed, 27 Aug 1997 10:17:53 +0000 w8jitom@postoffice.worldnet.att.net writes: Wouldnt it take pressure from the manufacturers? How many would want to give up their 6dB smoke screen? Be honest now. T; /archives//html/Amps/1997-08/msg00207.html (10,194 bytes)
11. [AMPS] Amps in Sept QST (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Wed, 27 Aug 1997 12:45:29 EDT; Once overheated beyond a certain point the cores become permanently non-linear. This is particularly true with ferrite. Powdered iron can develop fractures which result in similar problems. I do not; /archives//html/Amps/1997-08/msg00209.html (9,363 bytes)
12. [AMPS] Amps in Sept QST (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 27 Aug 1997 21:40:08 +0000; Nope, they do what they want to do. All that stuff about manufacturer's influence is sour grapes. I always use the conventional method in spec sheets. The AL-800H is speced at 30 some dB if I recall; /archives//html/Amps/1997-08/msg00215.html (9,647 bytes)

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