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141. Re: [Amps] Checking for IMD (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 13 Aug 2006 08:46:52 +0100; Pulling together a few sub-threads... The 11/110MHz (8553B) plugin for the 141T mainframe is stable enough for IMD testing, if you leave it for long enough to warm up - just don't expect to do any se; /archives//html/Amps/2006-08/msg00456.html (9,649 bytes)
142. Re: [Amps] Inverter Microwave HV Supply (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 24 Aug 2006 09:27:49 +0100; It does look strange... looks like they're trying to avoid having to provide gate drive to the floating transistor Q702, and are making Q702 trigger itself instead. -- 73 from Ian GM3SEK ____________; /archives//html/Amps/2006-08/msg00636.html (8,754 bytes)
143. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 27 Aug 2006 08:22:52 +0100; Rich gives only one part of the story. For the information of relative newcomers, "let the record show" the other part as well: N7WS categorically disagreed with Rich's interpretation of his measurem; /archives//html/Amps/2006-08/msg00692.html (10,100 bytes)
144. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 27 Aug 2006 18:54:47 +0100; If anyone cares to read it, the record of the 1996 debate on rec.radio.amateur.homebrew is available on Google Groups at: http://tinyurl.com/fe2qz Be prepared for 217 messages which will tell a diffe; /archives//html/Amps/2006-08/msg00713.html (11,615 bytes)
145. Re: [Amps] Cutting G-10 Board (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 30 Aug 2006 13:43:16 +0100; Several people have suggested cutting it roughly first, and then finishing off with some kind of router and a straight-edge. This is a job for a real router, though. Even a bottom-of-market 1/4-in ro; /archives//html/Amps/2006-08/msg00802.html (8,805 bytes)
146. Re: [Amps] Suppressors (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 30 Aug 2006 20:07:28 +0100; There is a spreadsheet on my home page (below) which does just that. It was originally for designing Pi and Pi-L networks, but after a previous round of this discussion in 1999-2000 I extended it to; /archives//html/Amps/2006-08/msg00821.html (9,461 bytes)
147. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 3 Sep 2006 08:38:50 +0100; Fortunately it doesn't matter, because "resonance" does not affect what L- or Pi-networks actually do. -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@con; /archives//html/Amps/2006-09/msg00053.html (8,526 bytes)
148. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 3 Sep 2006 23:53:09 +0100; That wasn't the point I was making at all! An L, Pi, Pi-L, T or similar network can be analysed, explained and designed in complete detail without ever using the concept of "resonance", so for these; /archives//html/Amps/2006-09/msg00061.html (9,394 bytes)
149. Re: [Amps] Vacuum variable testing? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 10 Sep 2006 16:11:41 +0100; Abandon hope. Glass-metal or ceramic-metal technology has to be done just right, or else something will leak or crack. Often you only get one chance to do it right, and many processes are a one-way t; /archives//html/Amps/2006-09/msg00171.html (7,815 bytes)
150. Re: [Amps] 572B bias (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 10 Sep 2006 16:28:01 +0100; The voltage "doubler" mod by K1KP/K6XX is almost certainly safe because it uses the existing relay supply rail, and only gives the relay a very short kick of increased voltage. All the rest of the ti; /archives//html/Amps/2006-09/msg00172.html (7,604 bytes)
151. Re: [Amps] Parasitic suppressors on GI-7B. (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 11 Sep 2006 07:18:18 +0100; 2W or 3W metal film resistors are the modern substitute for solid carbon. The inductance is slightly higher, but not seriously so, and it can be reduced by paralleling two or more higher-valued resis; /archives//html/Amps/2006-09/msg00180.html (8,634 bytes)
152. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 18 Sep 2006 07:36:00 +0100; All the good happened in the first two or three mains cycles, when the resistor limited the surge current to less than 8A (<240V / 30 ohms). By the time you can see anything on a meter, the surge is; /archives//html/Amps/2006-09/msg00211.html (7,876 bytes)
153. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 19 Sep 2006 19:48:51 +0100; Will had written: Sounds a bit primitive - no wonder it needs that big resistor! With so many well-known ways to make a completely automatic step-start, it seems a really strange decision to use a ma; /archives//html/Amps/2006-09/msg00223.html (10,422 bytes)
154. Re: [Amps] Step Start on a 3KA Amp (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 20 Sep 2006 10:33:44 +0100; Could someone point us to a schematic, please? (BAMA doesn't have it.) -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest; /archives//html/Amps/2006-09/msg00244.html (8,786 bytes)
155. Re: [Amps] [-] Re: Step Start on a 3KA Amp (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 20 Sep 2006 21:29:49 +0100; Different animal. Bob kindly forwarded the schematics for the 3KA, which uses two 3-500Zs. There are indeed a lot of things that could have been done differently - or rather, could be done differentl; /archives//html/Amps/2006-09/msg00249.html (9,806 bytes)
156. Re: [Amps] US source for TRIODE board (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 21 Sep 2006 23:03:09 +0100; Tom's Tubes is the only US distributor for my Triode Board and Tetrode Boards. Everyone is hoping that Tom will return from hospital soon, but you can also buy direct from me. For faster ordering and; /archives//html/Amps/2006-09/msg00272.html (7,861 bytes)
157. Re: [Amps] Is Amps still in existence? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 8 Oct 2006 16:30:12 +0100; Yes, exactly that. Same here, though all on a smaller scale of operations than Colin. OK, here's a question: any recommendations for a coil former material that can withstand a bit of heat? The 80/16; /archives//html/Amps/2006-10/msg00051.html (8,979 bytes)
158. Re: [Amps] Is Amps still in existence? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 8 Oct 2006 18:28:37 +0100; Might well try Teflon, if I can find some tubing of the right diameter. However, in a few months I may take the whole thing off-line and rebuild it as a Pi-L, which should reduce the working Q and th; /archives//html/Amps/2006-10/msg00057.html (8,905 bytes)
159. Re: [Amps] Is Amps still in existence? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 8 Oct 2006 21:09:47 +0100; It's 50mm OD x 125 tall (2in x 5in in old money) but a ceramic former is very unlikely to have holes in the right places for securing the two separate windings. That's where a Teflon former would sco; /archives//html/Amps/2006-10/msg00062.html (8,557 bytes)
160. Re: [Amps] Is Amps still in existence? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 9 Oct 2006 20:42:42 +0100; Thank you, Peter - you jogged my memory! I actually *have* one of those old ceramic TU5B formers. Found it, still packed away from the house move, and it did seem about the right size. Removed the li; /archives//html/Amps/2006-10/msg00073.html (9,135 bytes)

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