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261. Re: [Amps] AMP Reflector Quality of Information (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 20 Mar 2007 10:04:59 +0000; For me, the quantity has gone down, but the signal to noise ratio has improved. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2007-03/msg00235.html (6,917 bytes)
262. Re: [Amps] Stupid questions... (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 21 Mar 2007 08:02:40 +0000; It's sad if that's been your experience. Maybe I've been lucky, but it's a few rather than most who have been like that for me. Steve _______________________________________________ Amps mailing list; /archives//html/Amps/2007-03/msg00274.html (7,507 bytes)
263. Re: [Amps] Amp Supply LK500-zc tube asymmetry (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 21 Mar 2007 16:31:24 +0000; Vishay RCH and RPH series resistors might also be of interest. Available from Farnell/Newark if not elsewhere. Steve _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2007-03/msg00284.html (8,591 bytes)
264. Re: [Amps] Surge resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 21 Mar 2007 19:42:05 +0000; I've found Kapton tape can be handy, and some transistor silicone thermal mounting insulators have high voltage ratings and come in sizeable sheets. Steve ___________________________________________; /archives//html/Amps/2007-03/msg00289.html (8,429 bytes)
265. [Amps] 4CW2000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 22 Mar 2007 13:28:17 +0000; I've just taken delivery of one, NOS. It's a cute beast - reading the blurb, it's described as being a 4CX1000A with a water jacket cooler. Presumeably, this means that a 4CX1000A can take 2kW dissip; /archives//html/Amps/2007-03/msg00301.html (6,118 bytes)
266. Re: [Amps] Tank Coil spacing (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 26 Mar 2007 09:02:17 +0100; Something I found with external anode valves (4CX250 - 8877 sizes) is that the actual capacitance from anode to ground when they're mounted in a chassis, not close up against side panels, is roughly; /archives//html/Amps/2007-03/msg00339.html (6,915 bytes)
267. Re: [Amps] TMC amp toroid tank (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 27 Mar 2007 17:46:17 +0100; Does double pole switching work - or is it too hairy at the high impedance end? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2007-03/msg00366.html (8,171 bytes)
268. Re: [Amps] Pi-L Network (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 29 Mar 2007 10:44:43 +0100; I suspect it matters a lot how you design it and what your aims are. Simplistically, the main function is transforming the aerial impedance to what the valve anode wants to see. If you do this with f; /archives//html/Amps/2007-03/msg00385.html (8,930 bytes)
269. Re: [Amps] EB104 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 31 Mar 2007 08:08:51 +0100; It's a few years since I worked with one of these. I used a small bead thermistor and you just hang it off the bottom of the pcb on wires so it sits between the pcb and the heatsink. There's no heatf; /archives//html/Amps/2007-03/msg00415.html (7,594 bytes)
270. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 05 Apr 2007 14:45:59 +0100; As well as a data sheet with airflow figures, you can also find an article describing how to estimate what flow/pressure a blower will produce. In general, CFM ratings are not a useful guide - you ne; /archives//html/Amps/2007-04/msg00011.html (7,107 bytes)
271. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 06 Apr 2007 17:09:16 +0100; I don't think we differ. What I meant was that blower cfm ratings alone are not a useful guide to suitability for a given valve. First you have to establish if the blower can produce the pressure -; /archives//html/Amps/2007-04/msg00021.html (8,936 bytes)
272. Re: [Amps] Thanks (to whoever) for the 4CW2000A data sheet. (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 07 Apr 2007 07:43:57 +0100; 'Twas I. Credit to Eimac who sent it by return after my enquiry. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin; /archives//html/Amps/2007-04/msg00026.html (7,042 bytes)
273. [Amps] Heater voltage (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Apr 2007 12:04:38 +0100; Thinking of valves with oxide cathodes (8877, 4CX1000A etc.) is there a particular reason why Eimac went for low voltage high current? It seems to me that chokes, wiring, offboard psus would be easie; /archives//html/Amps/2007-04/msg00036.html (6,190 bytes)
274. Re: [Amps] amp hardware (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 10 Apr 2007 14:40:44 +0100; I'd echo that - no problems with amplifiers stored in a seaside caravan for many years. One option to consider is getting the aluminium parts chromate passivated (Aludyne or Irridite in the US?). Cos; /archives//html/Amps/2007-04/msg00049.html (7,394 bytes)
275. Re: [Amps] RE : amp hardware (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 11 Apr 2007 07:25:42 +0100; Now I don't have access to a big press, I use a bench vice and ballbearing to get a neat finish with Hank bushes. Steve _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2007-04/msg00076.html (8,112 bytes)
276. Re: [Amps] 8877 blower requirement -airflow switch (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 12 Apr 2007 08:03:27 +0100; I've used a ptc thermistor - the sort that changes from low to high resistance abruptly at a set temperature. Run some current through it so it self heats, the airflow cools it so it stays below the; /archives//html/Amps/2007-04/msg00086.html (7,073 bytes)
277. Re: [Amps] RE : amp hardware (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 12 Apr 2007 10:21:37 +0100; I have one. The hole sizes vary with type of screw, length of screw and how the hole is made. When I get a few minutes spare I'll scan it. Steve PS Have you noticed that 'verniers' has remained the; /archives//html/Amps/2007-04/msg00088.html (7,281 bytes)
278. [Amps] MRF476 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 13 Apr 2007 17:29:00 +0100; Not quite QRO, but has anybody got one I can buy? It's for a friend's restoration project and equivalents or alternatives absolutely will not do. Thanks, Steve _______________________________________; /archives//html/Amps/2007-04/msg00108.html (6,048 bytes)
279. Re: [Amps] (Fwd) Amp tube pin/socket de VY1JA (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 15 Apr 2007 22:29:17 +0100; At the risk of repeating myself, there are several things commonly called 'silver solder'. If you take the tube to a model maker and ask if he can silver solder it, he might think you mean braze it,; /archives//html/Amps/2007-04/msg00146.html (8,309 bytes)
280. Re: [Amps] 3-500 Pins? (AA6DX - Mark) (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 16 Apr 2007 07:52:18 +0100; I agree there are exceptions, but for the most part they are temporary or esoteric. Just about all 'normal' manufactured electronics is covered. Perversely, so is antique/second hand gear if it's not; /archives//html/Amps/2007-04/msg00158.html (8,003 bytes)

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