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References: [ +from:davek@medphys.ucl.ac.uk: 88 ]

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41. [AMPS] Oxide Cathodes (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 01 May 1998 18:33:14 +0100; The 3CX5000A7 (not 3CPX5000A7) tube data sheet says you can use class C, but Eimac have told me not too, based on a limited lifetime in FM broadcase transmitters. However, many oxide cathode tubes a; /archives//html/Amps/1998-05/msg00015.html (7,351 bytes)
42. [AMPS] mystery xfmr (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 26 May 1998 11:19:25 +0100; A word of warning. I once found a transformer, marked 2.6 kV, 3.15 A. On it was 'Prime-Arc'. The transformer was *very* heavy. Initial tests indicated the open circuit voltage was a little over this,; /archives//html/Amps/1998-05/msg00578.html (8,246 bytes)
43. [AMPS] Triode Amp -> Phase measuring. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 28 May 1998 15:50:47 +0100; You could consider using just a mixer. The DC output at the IF port of a mixer, with the *same* frequency fed into the RF and LO ports, depends (in theory) only on the the amplitude of the signal in; /archives//html/Amps/1998-05/msg00607.html (10,326 bytes)
44. [AMPS] Re: (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 29 May 1998 12:29:57 +0100; I dont know for sure, but suspect the most likely candidates are magnetic resonance imaging (MRI), or to give its its old name, nuclear magnetic resonance (NMR) - the latter being dropped, as the wor; /archives//html/Amps/1998-05/msg00634.html (9,398 bytes)
45. [AMPS] Re: (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 29 May 1998 18:05:55 +0100; Its probably better to say MRI is a subset of NMR. NMR does cover spectscopy (probably what you mean by material reseach), but the term 'NMR' has been droped in hospitals - as least amongst clinicia; /archives//html/Amps/1998-05/msg00647.html (9,403 bytes)
46. [AMPS] FS: YC-156 and 8877 tubes (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 01 Apr 1998 16:44:50 +0100; The YC156 is *not* the same as the 3CX5000A7. Mechanically it is, but electrically its significantly different - higher heater voltage, lower heater current, greater warm-up time, designed for pulsed; /archives//html/Amps/1998-04/msg00003.html (7,754 bytes)
47. [AMPS] YC-156 Data (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Sat, 04 Apr 1998 16:23:08 +0100; I was told that the 3CX15000B7 would be a good starting point by Eimac. The heater, grid, and cathode are all the same. The bottom end of the3CX15000B7, 3CPX5000A7 and YC156 s are mechanically identi; /archives//html/Amps/1998-04/msg00033.html (7,552 bytes)
48. [AMPS] YC156/3CPX5000A7 and 3CX15000B7 data. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 07 Apr 1998 18:37:20 +0100; Following several requests, I have put full data sheet for the following 3 Eimac tubes on the Universities ftp site: YC156 - some of these are surfacing now. 3CPX5000A7 - Identical to above, apart fr; /archives//html/Amps/1998-04/msg00052.html (8,594 bytes)
49. [AMPS] Re: YC156/3CPX5000A7 and 3CX15000B7 data. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 07 Apr 1998 20:04:59 +0100; sorry, I made a mistake earlier. I meant password is your email address, not usename. G8WRB -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative reques; /archives//html/Amps/1998-04/msg00055.html (7,757 bytes)
50. [AMPS] Re: YC156/3CPX5000A7 and 3CX15000B7 data. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 08 Apr 1998 11:01:55 +0100; Sorry, I did not give the path to the files. ftp to medphys.ucl.ac.uk cd to pub/users/davek Data sheets are in files yc156.zip, 3cpx5000a7.zip and 3cx15000b7.zip. The other two files there may be of; /archives//html/Amps/1998-04/msg00061.html (7,776 bytes)
51. [AMPS] YC156/3CPX5000A7 and 3CX15000B7 data. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 09 Apr 1998 10:54:45 +0100; Sorry, I said I would put data on the tubes on the ftp site here at the university where I work. Unfortunately, something has gone wrong with the permissions, or similar on the ftp directory, blockin; /archives//html/Amps/1998-04/msg00068.html (8,052 bytes)
52. [AMPS] YC156/3CPX5000A7 and 3CX15000B7 data. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 09 Apr 1998 15:21:26 +0100; My ftp directory is now working - quicker than I thought it would be. Hence the files can be downloaded. I've added the data sheet for the 3CX5000A7 and put a readme in there that may be of interest.; /archives//html/Amps/1998-04/msg00072.html (8,581 bytes)
53. [AMPS] Data Sheets YC156/3CX15000B7. (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 15 Apr 1998 13:24:26 +0100; I've looked at the data sheets for the YC156 and 3CPX15000B7, and the constant current curve for anode currents are very similar indeed. The pulsed tube (YC156) is plotted over a much larger cathode-; /archives//html/Amps/1998-04/msg00095.html (9,321 bytes)
54. [AMPS] Blowers (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 10 Mar 1998 13:52:13 +0000; I've spent some considerable time playing with centrifugal blowers of various sizes to cool big tubes, and looking at the theory to some extent - without wishing to do a PhD in the subject. I don't k; /archives//html/Amps/1998-03/msg00147.html (9,252 bytes)
55. [AMPS] Blowers for finned tubes (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 11 Mar 1998 15:43:47 +0000; One way I have measured cfm is to heat a big (few 100 W) resistor in the input side of the amp, then measure the air temperature just before the resistor, and at the bottom of the anode cooler, with; /archives//html/Amps/1998-03/msg00173.html (9,195 bytes)
56. [AMPS] Re: Blowers (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 12 Mar 1998 15:55:31 +0000; While its probably true that if the pressure is okay, then the flow is too *if you use the correct bases*, you can not apply this if you make your own bases, which many amateurs do. Neither can it be; /archives//html/Amps/1998-03/msg00207.html (9,394 bytes)
57. [AMPS] Blowers - > Protection from failure (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 12 Mar 1998 17:16:00 +0000; While the subject of blowers is being talked about, I would just add that Herga in the UK: Herga Electric Limited Northern Way Bury St. Edmunds Suffolk IP32 6NN UK Telephone: +44 (0)1284 701422 Facsi; /archives//html/Amps/1998-03/msg00208.html (9,290 bytes)
58. [AMPS] Blowers (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 12 Mar 1998 20:16:57 +0000; I said Earlier: R. L. Measures replied. According to my reasoning, this is simply not true. The Eimac data given is for the tube and socket used together. The pressure drop quoted in the data sheet w; /archives//html/Amps/1998-03/msg00212.html (8,686 bytes)
59. [AMPS] Software for anode line impedance (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 24 Mar 1998 11:24:35 +0000; In December 1996 QEX I published a paper, and gave a simple DOS or unix program, designed primarily for finding the impedance of anode lines, taking into account the presence of the anode cavity - ie; /archives//html/Amps/1998-03/msg00379.html (8,795 bytes)
60. [AMPS] High Potential Tester (high-pot) Components (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 19 Jan 1998 14:52:15 +0000; It *not* true to say that a centre-tap will be half the resistance of the full windings. I hit this once when making resistnace mesurements on a 1800-0-1800V tranny. Once half had about 30% (from me; /archives//html/Amps/1998-01/msg00062.html (9,211 bytes)

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