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381. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 7 Jun 1997 20:11:01 +0100; Not all tetrodes require grid bias voltages that conveniently match up to the available drive power and the grid swamping resistance. Adjusting the grid bias may work for Rich's amplifiers because th; /archives//html/Amps/1997-06/msg00091.html (11,219 bytes)
382. [AMPS] Splatter (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 8 Jun 1997 08:54:41 +0100; It's absolutely spot-on topic. It depends what you call "delicate". The 4CX800 has a rated maximum grid dissipation of 2W, which means that at the normal bias voltage of -60V you could run as much as; /archives//html/Amps/1997-06/msg00102.html (11,165 bytes)
383. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 8 Jun 1997 11:53:40 +0100; OK, that makes sense, but until now I don't recall you mentioning the need for a range of input transformer ratios to bring everything into roughly the right ball-park. Ah... I do not interpret that; /archives//html/Amps/1997-06/msg00103.html (11,938 bytes)
384. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 8 Jun 1997 16:36:57 +0100; The RSGB VHF/UHF contest rules and Code of practice are at http://ourworld.compuserve.com/homepages/txrx/97genrul.htm They are mostly off-topic for Amps, so here is a very brief summary. Nobody is pe; /archives//html/Amps/1997-06/msg00105.html (10,712 bytes)
385. [AMPS] Splatter (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 9 Jun 1997 09:34:49 +0100; Oops - my mistake, thanks for the correction, Tom. I extrapolated too far from the simple fact that the 4CX800 and 400 have the same 2W maximum grid dissipation as the 4CX250 which can be operated in; /archives//html/Amps/1997-06/msg00126.html (12,563 bytes)
386. [AMPS] Splatter and ALC (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 9 Jun 1997 09:29:54 +0100; W8JI quoted: Yecchhh.... it's the same the whole world over! The only way to check whether you're splattering across the band is to ask another ham to go and listen. Find a totally quiet band, and a; /archives//html/Amps/1997-06/msg00127.html (9,354 bytes)
387. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 9 Jun 1997 14:21:59 +0100; Funny that Eimac allow 5mA on peaks, if you read the whole data sheet. Only if you can promise never, never, never to run any grid current at all! With an output resistance that high, the slightest t; /archives//html/Amps/1997-06/msg00130.html (9,849 bytes)
388. [AMPS] Heat Paint (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 9 Jun 1997 14:33:09 +0100; 2, 4, 8, enter, 3, 2 - 5 x 9 /... oh, 120 to 600 deg C! What are the intermediate values, please? A set with closer-spaced values going up to 250C/482F would be even more useful. If anybody is thinki; /archives//html/Amps/1997-06/msg00135.html (8,751 bytes)
389. [AMPS] Splatter (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 9 Jun 1997 14:05:36 +0100; ... which causes gain compression and IMD. That's a circular argument. You're ASSUMING that grid current causes IMD, so of course you must "deduce" that anything that limits grid current must reduce; /archives//html/Amps/1997-06/msg00136.html (11,598 bytes)
390. [AMPS] Heat Paint (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 10 Jun 1997 14:03:28 +0100; Thank you very much, Frank. The second set seems much more useful for ceramic tubes that have maximum seal temperatures up to 250C (482F), and there are also twice as many crayons for half the price; /archives//html/Amps/1997-06/msg00158.html (8,730 bytes)
391. [AMPS] splatter (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 10 Jun 1997 14:09:57 +0100; Oh boy! THAT I couldn't miss! Seriously, I feel sure that 99% of all Internet disputes could be resolved in five minutes if the individuals could actually meet in person. 73 from Ian G3SEK Editor, 'T; /archives//html/Amps/1997-06/msg00161.html (9,109 bytes)
392. [AMPS] Heat Paint (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 11 Jun 1997 09:35:03 +0100; Thanks - I've asked for a catalog(ue). Thanks also to Frank for the details on ordering from McM-C. I've faxed for their catalog too. We can dream... On a closely related topic, I've been playing aro; /archives//html/Amps/1997-06/msg00175.html (8,829 bytes)
393. [AMPS] splatter (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 11 Jun 1997 13:41:18 +0100; WA2MOE replied: IMO, neither of the above. What drives new ideas and designs are not the differences of opinion, but the process of *resolving* them. That's what happens when two or more people discu; /archives//html/Amps/1997-06/msg00179.html (10,531 bytes)
394. [AMPS] AB1 vs AB2 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 11 Jun 1997 20:54:52 +0100; Well, perhaps we should concentrate on the output impedance in ohms, and then whether it's high or low enough for any specific application. As a reminder, the impedance is the slope of the V/I curve,; /archives//html/Amps/1997-06/msg00188.html (12,343 bytes)
395. [AMPS] Heat Paint (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 11 Jun 1997 19:38:05 +0100; Hi George I should have known you'd be lurking on "AMPS"! Well, not necessarily "the " most significant... but it did answer a question that had been hovering in the back of my head for about 25 year; /archives//html/Amps/1997-06/msg00191.html (8,448 bytes)
396. [AMPS] Heat Paint (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 12 Jun 1997 15:56:43 +0100; Well, the good news is that Omega Engineering UK sent their enormous US hardback 'Temperature' catalog by overnight special delivery. The better news is that they have OMEGALAQ temperature-sensitive; /archives//html/Amps/1997-06/msg00202.html (8,821 bytes)
397. [AMPS] two tone test (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 17 Jun 1997 17:24:08 +0100; My own measurement facilities are very limited, but I have analysed a lot of data collected by other people. If you extend the IMD plot out to very low levels, then the results from a two-tone audio; /archives//html/Amps/1997-06/msg00253.html (8,067 bytes)
398. [AMPS] AB1/2 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 18 Jun 1997 13:41:52 +0100; 'Twas I - thanks for the information, Peter. That's about 480 ohms for a typical string of two VR105s and a VR150. So the diode junctions and the 4CX1000 screen grid were both involved in thermal run; /archives//html/Amps/1997-06/msg00268.html (8,473 bytes)
399. [AMPS] Vacuum relay (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 1 May 1997 15:21:05 +0100; Please can someone with an ITT Jennings catalog e-mail the contact ratings and switching speed of the type RFE-26N1070 vacuum relay? Thank you! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Pra; /archives//html/Amps/1997-05/msg00000.html (6,502 bytes)
400. [AMPS] Vacuum relay (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 1 May 1997 22:33:17 +0100; Sorry everybody, that should have been RFIE- - - Damned astigmatism! ^ Apparently they're used in defibrillators. I was thinking of making a short-circuit tester for the 3kV supply, which is kind of; /archives//html/Amps/1997-05/msg00001.html (7,219 bytes)

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