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41. Re: [Amps] *** SPAM *** Re: Antenna traps (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 16 Dec 2005 11:10:49 +0000; You're right, I generalized too far. However, I think Let's think of two totally generalized impedances, (R1 in series with jX1) and (R2 in series with X2). In this context X1 and X2 can have either; /archives//html/Amps/2005-12/msg00200.html (11,123 bytes)
42. Re: [Amps] *** SPAM *** Re: Antenna traps (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 16 Dec 2005 16:06:48 +0000; That's a fair point. The more elements you add, the more possibilities you have to synthesize a network that transforms the impedance in a cascade of small steps. Then, as Peter points out, it begins; /archives//html/Amps/2005-12/msg00204.html (9,867 bytes)
43. Re: [Amps] Matching (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 20 Dec 2005 08:56:47 +0000; And also whether the series output C of the T-network is helping or not. In the particular case of 100+j50, the series C tunes out the reactance and leaves 100+j0 to be matched. None of the L-network; /archives//html/Amps/2005-12/msg00274.html (9,319 bytes)
44. Re: [Amps] Designing the Cleanest Linear with RF Negative Feedback (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 22 Dec 2005 07:55:16 +0000; tubes" is located? http://www.cpii.com/eimac/eiapps.htm The link to "Son of C&F" is at the top of the page. Also see the links to many of our other favorite topics. -- 73 from Ian GM3SEK 'In Practice; /archives//html/Amps/2005-12/msg00293.html (10,761 bytes)
45. Re: [Amps] Designing the Cleanest Linear with RF Negative Feedback (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 22 Dec 2005 10:34:14 +0000; Reminds me of a certain K5 station asking a European moonbouncer: "Whaddya runnin'?" "A 4CX250 --" "Geez, whaddya drivin' with THET?" (It wasn't K5GW, but Gerald will know the voice :-) -- 73 from Ia; /archives//html/Amps/2005-12/msg00295.html (10,619 bytes)
46. Re: [Amps] GS-35B Grid Current? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 31 Dec 2005 20:31:58 +0000; Hello Mike About 250-300mA. Depends what you mean by "maximum"... In anything you would describe as "normal" operation, the maximum would be about 350mA. If it's significantly higher than that, then; /archives//html/Amps/2005-12/msg00409.html (7,522 bytes)
47. Re: [Amps] GS-35B Grid Current? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 1 Jan 2006 00:14:39 +0000; Ahem... Happy New Year! -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-12/msg00413.html (7,571 bytes)
48. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Sun, 08 Jan 2006 18:55:02 +0000; Hal, the best way to protect your investment is to download another copy of your Triode Board manual :-) The ideal situation for diode protection is when the meter has a voltage drop of just 0.5V at; /archives//html/Amps/2006-01/msg00255.html (9,559 bytes)
49. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 09 Jan 2006 15:51:48 +0000; Don't believe him. Charlie Brown KNOWS that EVERYONE has noticed. -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2006-01/msg00265.html (8,542 bytes)
50. Re: [Amps] GS-35B Vertical Mounting & Input Impedance (score: 1): Author: GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 12 Jan 2006 08:01:16 +0000; That's OK - the GS35 has an internal sieve: http://www.pa3csg.hoeplakee.nl/tubes/tubes.html Most transmitting tubes have the heater/cathode in the middle and the anode around the outside. The GS35, G; /archives//html/Amps/2006-01/msg00353.html (9,486 bytes)
51. Re: [Amps] Original Ameritron AL-80 question (score: 1): Author: GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 13 Jan 2006 11:28:26 +0000; Misunderstanding about the way that the chemical getter cleans up the gas atoms that are released from the inside surfaces of a 'vacuum' tube if it is not used for several years. (NB this is not the; /archives//html/Amps/2006-01/msg00369.html (9,311 bytes)
52. Re: [Amps] Burn-in for Eimac? (score: 1): Author: GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 16 Jan 2006 08:35:16 +0000; That was my first reaction too. If you've hi-potted it and *measured* the leakage current, you have a lot more information than any date code could provide. Well there's a little project for you, Bil; /archives//html/Amps/2006-01/msg00402.html (8,145 bytes)
53. Re: [Amps] Burn-in for Eimac? (score: 1): Author: GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 17 Jan 2006 09:07:50 +0000; The same material. The difference is that oxygen tends to form a stronger chemical bond than nitrogen or the inert gases do. 73 from Ian GM3SEK _______________________________________________ Amps ma; /archives//html/Amps/2006-01/msg00420.html (8,304 bytes)
54. Re: [Amps] Burn-in for Eimac? (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Tue, 17 Jan 2006 18:49:55 +0000; Just arrived home to read Rich, Karl-Arne, then Rich again... Thanks, Karl-Arne, that's a very interesting reference. It's hard to choose exactly the right words to describe what happens at the metal; /archives//html/Amps/2006-01/msg00429.html (10,313 bytes)
55. Re: [Amps] Burn-in for Eimac? (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Tue, 17 Jan 2006 22:47:00 +0000; That's about right - you can look at 'physical chemistry' from both viewpoints, which makes it interesting. However, most chemists think it's too much like physics, while most physicists think it's t; /archives//html/Amps/2006-01/msg00436.html (9,316 bytes)
56. Re: [Amps] 3dB Hybrid coupler (score: 1): Author: GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 17 Jan 2006 22:54:33 +0000; Yes, you can build 'rat-race' couplers with coax: KL7WE, Combining Amps for High Power, Central States VHF Convention 1988, p149. It doesn't seem to be on the web, but I will be able to supply a copy; /archives//html/Amps/2006-01/msg00437.html (6,909 bytes)
57. Re: [Amps] Tuned Input (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Fri, 20 Jan 2006 16:37:13 +0000; The recommendation for an input tuned circuit Q of 2-4 came from a 1961 article by Eimac authors in QST. That recommendation was specifically based on a pi tank, and it was also pointed out that the; /archives//html/Amps/2006-01/msg00486.html (9,706 bytes)
58. Re: [Amps] Tuned Input (score: 1): Author: "Ian White, GM3SEK" <gm3sek@ifwtech.co.uk>; Date: Mon, 23 Jan 2006 11:37:41 +0000; Yes, they did, but that recommendation didn't rule out the use of a pi-tank. In the first edition of 'SSB Principles and Circuits', the Collins authors show a driver with an output pi-tank, the magic; /archives//html/Amps/2006-01/msg00534.html (8,754 bytes)
59. Re: [Amps] GE EF-5A VHF Amplifier (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 26 Jan 2006 21:40:39 +0000; Is the screen voltage of this amplifier stabilized against both positive and negative screen currents? It could be screen voltage runaway caused by negative screen current, to which the 4CX250B is ve; /archives//html/Amps/2006-01/msg00620.html (9,812 bytes)
60. Re: [Amps] What blower? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 28 Jan 2006 14:46:01 +0000; Remember that American blowers are rated for 60Hz supplies, and will give much less air output on European 50Hz supplies. -- 73 from Ian GM3SEK _______________________________________________ Amps ma; /archives//html/Amps/2006-01/msg00644.html (8,328 bytes)

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