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

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61. [AMPS] Heater warmup time on *big* tubes (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 22 Jan 1998 16:58:17 +0000; Does anyone have any idea on the length of time that big (i.e. 1MW + ) tubes take to heat up the cathodes, from the time filament voltage is applied ? A friend asked me, thinking I would know, but ne; /archives//html/Amps/1998-01/msg00083.html (7,337 bytes)
62. [AMPS] Storage of tubes (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 23 Jan 1998 11:02:44 +0000; I've got several tubes including 4CX250B's, Y799 and Y808 (both conduction version of the 4CX250), 4CX350, 4CX1000A, 3CX5000A7, YC156 (very similar to 3CPX5000A7) etc, that I intend using some time,; /archives//html/Amps/1998-01/msg00089.html (7,271 bytes)
63. [AMPS] Homebrew PIN Diode QSK for kW amplifier (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 28 Jan 1998 11:08:18 +0000; HP do several application notes on pin diodes. I expect you can order or download them from their web site although I have never tried to do so. www.hp.com would be a starting point. -- Dave Kirkby D; /archives//html/Amps/1998-01/msg00106.html (7,761 bytes)
64. [AMPS] Homemade HV connectors (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 29 Jan 1998 17:45:59 +0000; I would certainly not used N's, PL259's or anything similar. The risk of plugging your homemade connector with 4 kV into some preamp or rig is too great. There is serious risk to yourself and your eq; /archives//html/Amps/1998-01/msg00121.html (9,079 bytes)
65. [AMPS] Microprocessor-Controlled Amps (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 29 Jan 1998 18:47:04 +0000; Sorry I dont know the amps you talk of. If you do find anything useful on microprocessor control of amps, I would be very interested. I have bought a Tern V104 controller board (uses NEC 25 CPU) and; /archives//html/Amps/1998-01/msg00122.html (9,919 bytes)
66. [AMPS] How to Test ? (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 5 Dec 97 12:13:11 GMT; I know of a company in the UK that can 'test' most tubes. The chap was quite helpful and agreed to test a 3CX5000A7 for a nominal cost (about 35 pounds) if I did not mind waiting until he was not bu; /archives//html/Amps/1997-12/msg00085.html (8,441 bytes)
67. [AMPS] Microprocessor control of high power amps (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 08 Dec 1997 10:48:38 +0000; Has anyone any experience in controlling a high power amp with a microprocessor ? I've recently purchased a board based on the 8 MHz NEC V25 (clone of Intel 8086 16 bit CPU) that has 11 channels of A; /archives//html/Amps/1997-12/msg00124.html (8,973 bytes)
68. [AMPS] Source of HV Fuses ? (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 15 Dec 1997 10:02:41 +0000; I missed the request for a source of HV fuses, but did see a reply. Bussman (www.bussman.com) make them, and if memory serves me correct, their web page has addresses of distributors. I bought a few.; /archives//html/Amps/1997-12/msg00291.html (8,684 bytes)
69. [AMPS] Eimac YC156 - comments (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 04 Nov 1997 12:12:05 +0000; I saw the post about the YC156's, and would like to make a few comments. I have no connection with the person advertising them, but did purchase 2 tubes from him a month or two ago. 1) The YC156 is a; /archives//html/Amps/1997-11/msg00035.html (8,876 bytes)
70. [AMPS] Automatic tuning of a VHF amp (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 10 Nov 1997 11:07:13 +0000; Hi all, my latest VHF triode amp is going to use stepper motors to control the anode tuning and possibly loading, for two main reasons: 1) That way I can get the controls in the best position on the; /archives//html/Amps/1997-11/msg00122.html (8,451 bytes)
71. [AMPS] Automatic tuning of a VHF amp (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 10 Nov 1997 12:26:26 +0000; Thanks for your comments on automatic tuning. I assume a computer could be programed to do it from just the RF output, grid current and anode current - after all, thats all we use. However, I did not; /archives//html/Amps/1997-11/msg00126.html (9,122 bytes)
72. [AMPS] AUTOTUNING (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 11 Nov 1997 10:54:33 +0000; Thanks for that, I'll chase the references. Since my PA is a triode, note a tetrode, screen current is not an issue. I have directional couplers in the output (already in place) and input (not yet m; /archives//html/Amps/1997-11/msg00138.html (15,948 bytes)
73. [AMPS] more power more TVI?? (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Tue, 11 Nov 1997 14:06:20 +0000; Yor friend is lucky, and in my experience unusual. However, its easy to see why this is possible. Assume: 1) There is no fault on the telly - unusual!! 2) The basic transceiver has a fault - say a hi; /archives//html/Amps/1997-11/msg00147.html (8,438 bytes)
74. [AMPS] auto transformers (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Mon, 17 Nov 1997 14:29:59 +0000; can see that increasing the voltage into an amp (or any equipment for that matter), needs *very* careful thought (ie its not something I can see myself doing), it can be done without a BIG and HEAVY; /archives//html/Amps/1997-11/msg00227.html (8,898 bytes)
75. [AMPS] tube compatability (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 19 Nov 1997 10:58:24 +0000; The tubes are not the same - the 3CPX being desinged primarily for pulsed use - the P indicates pulsed. However, you probably can use the pulsed (3CPX) tube, but there is likely to be some difference; /archives//html/Amps/1997-11/msg00263.html (9,380 bytes)
76. [AMPS] Screen Supplys (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 19 Nov 1997 11:21:02 +0000; There is some data on G3SEK's web page, by GW4FRX, on the IMD performance of 4CX350s (which need about 400 V) using:1) A well stabilised screen supply. 2) The screen stabilised supply with a resisto; /archives//html/Amps/1997-11/msg00265.html (9,294 bytes)
77. [AMPS] Solid State Relay for Anode Primary ? (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Thu, 20 Nov 1997 11:58:48 +0000; I do know of an instance where a friend G8WYI got a nasty belt from the HT supply he thought was off. Although never proved conclusively, I believe the reason was the leakage of the solid state rela; /archives//html/Amps/1997-11/msg00279.html (8,344 bytes)
78. [AMPS] Resistor in B+ lead (score: 1): Author: davek@medphys.ucl.ac.uk (David Kirkby); Date: Thu, 09 Oct 1997 11:21:25 +0100; I've been pondering the following question, and would apprecaite any thoughts others have. Whats the best value of resistor in the B+ lead to protect a power tube in the event of an arc ?? Obviously,; /archives//html/Amps/1997-10/msg00051.html (8,592 bytes)
79. [AMPS] Free blowers for monster amps. (score: 1): Author: davek@medphys.ucl.ac.uk (David Kirkby); Date: Wed, 15 Oct 1997 16:29:52 +0100; I have a couple of large blowers, ideal for monster amps, going for free if anyone wants them: The data quoted is from memory - I'll check for certain if anyones interested. Unless anyone wants them,; /archives//html/Amps/1997-10/msg00089.html (8,229 bytes)
80. [AMPS] Bird Thruline Line Section Question (score: 1): Author: davek@medphys.ucl.ac.uk (David Kirkby); Date: Thu, 16 Oct 1997 10:55:36 +0100; Bird equipment is distributed by Aspen Electronics. Sorry I dont have the number handy. To my knowledge, there are at least two types of meters - some are 30 uA FSD (the most common one), but there a; /archives//html/Amps/1997-10/msg00093.html (8,608 bytes)

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