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221. Re: [Amps] MOSFET biasing (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 26 Jul 2006 10:37:13 +0200 (CEST); the point where IM in good crystal filters limits receiver performance with them.< You could do that with bipolars 30 years ago, too. Lower frequency filters (1.4MHz) tend to better than high frequen; /archives//html/Amps/2006-07/msg01146.html (7,563 bytes)
222. Re: [Amps] PIN diode mods (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 26 Jul 2006 10:41:25 +0200 (CEST); DX. Likewise some hams claim the Pro III is so much quieter than the Pro II.< It's fair to say that for the majority of us, the limit is external noise. Although under conditions with lots of strong; /archives//html/Amps/2006-07/msg01147.html (6,887 bytes)
223. [Amps] flash arcs (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 26 Jul 2006 12:55:10 +0200 (CEST); According to Gossling's paper in the Journal of the IEE (which means it was certainly peer reviewed!), flash arcs is slightly affected by residual gas: the 'clean up' effect of the arc can lower the; /archives//html/Amps/2006-07/msg01152.html (7,032 bytes)
224. Re: [Amps] setting the grid adrift (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 26 Jul 2006 15:30:18 +0200 (CEST); Tom, Do you know where Cetron 572Bs are (or were) made? 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin; /archives//html/Amps/2006-07/msg01169.html (7,463 bytes)
225. Re: [Amps] setting the grid adrift (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 26 Jul 2006 16:17:53 +0200 (CEST); What other tubes did they make? The only product I've ever seen or heard of from Cetron is the 572B/T-160L: it seems barely credible that anything other than a very small company (sort of 'all in you; /archives//html/Amps/2006-07/msg01174.html (8,375 bytes)
226. [Amps] Flash arcs (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 27 Jul 2006 10:41:03 +0200 (CEST); Never said a word about the IEEE. In the 1850's there was set up in London a 'Society of Electricians'. In the 1860's or thereabouts, they became the 'Institution of Telegraph Engineers', and at some; /archives//html/Amps/2006-07/msg01214.html (7,886 bytes)
227. Re: [Amps] Flash arcs (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 27 Jul 2006 20:51:07 +0200 (CEST); Will, The IEEE have the best magazines (I refer to them rudely as comics) though - the Journals of the Solid State Circuits and Antennas and Propagation societies are the ones I take. 73 Peter G3RZP; /archives//html/Amps/2006-07/msg01222.html (7,646 bytes)
228. [Amps] valves v. tubes - was flash arcs (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 28 Jul 2006 10:47:26 +0200 (CEST); It's 'lampe' in French, though - which, certainly in the case of things like the French R valve, it looked like - in more ways than one with bright emitter valves. And phosphorous getters. The Englis; /archives//html/Amps/2006-07/msg01230.html (7,023 bytes)
229. [Amps] Tubes 201 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 28 Jul 2006 12:55:58 +0200 (CEST); Two questions: 1. In xenon rectifiers such as the 3B28, how pure did the xenon have to be, and what was the result of contamination? 2. Early tubes were often deliberately 'soft' because they made be; /archives//html/Amps/2006-07/msg01231.html (6,498 bytes)
230. Re: [Amps] Weak Amperex 3-500Z (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 28 Jul 2006 17:47:40 +0200 (CEST); just worn out? < It sounds as if the emission is low. Over the last 60 years or so, there have been a number of articles on recovering thoriated tungsten filament tubes. No guarantees are offered, bu; /archives//html/Amps/2006-07/msg01239.html (7,930 bytes)
231. Re: [Amps] Ameritron Amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 11:53:30 +0200 (CEST); the only ones still building amateur amplifiers with glass tubes.< Strictly speaking, Joe, I think you have to qualify that with 'in the US'. 73 Peter G3RZP __________________________________________; /archives//html/Amps/2006-07/msg01358.html (8,038 bytes)
232. Re: [Amps] Ameritron Amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 12:35:24 +0200 (CEST); effect in Starkville< In factories with very high levels of QA and inspection, things still get changed in production. Sometimes QA know and agree but don't check with engineering. Even if they do, t; /archives//html/Amps/2006-07/msg01359.html (9,050 bytes)
233. Re: [Amps] Pre-heating of tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 12:48:26 +0200 (CEST); According to my book on heat rreatment (Hardening, Tempering and Heat treatment, Tubal Cain, Nexus Special interests, ISBN 0 85242 837 5) in a dim natural light, 700 deg C is dull red, 740 blood red,; /archives//html/Amps/2006-07/msg01360.html (7,870 bytes)
234. Re: [Amps] Pre-heating of tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 12:55:54 +0200 (CEST); hereabouts, why do large tubes depend on built-in ion pumps?< Because for many of them, they don't get hot enough except around the filament. The filament can be a long way physically from the bits t; /archives//html/Amps/2006-07/msg01362.html (7,084 bytes)
235. [Amps] 160m RTTY (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 13:15:26 +0200 (CEST); Tom said (in the plexiglas thread, but we're wandering a bit from that) 160. Multipath kills it.< I don't know how bad the multipath is, and obviously, it's going to depend on the path length and so; /archives//html/Amps/2006-07/msg01363.html (7,482 bytes)
236. Re: [Amps] Ameritron Amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 13:23:04 +0200 (CEST); in perfect English. < Oh, I agree entirely. But a lot of US companies would run into trouble if that idea was strictly applied, although admittedly, they do get it right in American! 73 Peter G3RZP _; /archives//html/Amps/2006-07/msg01364.html (7,950 bytes)
237. Re: [Amps] 160m RTTY (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 30 Jul 2006 19:14:27 +0200 (CEST); manually by the operator to establish the time difference reading. < It's a long time since I read the book on Loran A, but that's what I remember. So multipath will tend to 'smear' the pulses, but I; /archives//html/Amps/2006-07/msg01391.html (7,352 bytes)
238. Re: [Amps] Pre-heating of tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 31 Jul 2006 08:12:03 +0200 (CEST); Hi Will, Tubal Cain is dead now. He was a guy called Tom Walsh, a G2 plus 2, whow as very well known in model engineering circles. You said: >Check again and see if that isn't degrees F your quoting.; /archives//html/Amps/2006-07/msg01416.html (7,941 bytes)
239. Re: [Amps] conversion scale from dbu to microvolts (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 31 Jul 2006 08:39:15 +0200 (CEST); behavior of the receiving antenna is part of the relationship between that field strength and the power and voltage at the receiver input. That makes any use of this field strength dBu to describe re; /archives//html/Amps/2006-07/msg01417.html (9,334 bytes)
240. Re: [Amps] MTBF - was Ameritron Amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 31 Jul 2006 14:04:29 +0200 (CEST); Tom, You've just provided 'Reliability 101'. MTBF is a figure often bandied about, but without the correct assumptions, numbers and inputs to the equations, can be very misleading. For example, the M; /archives//html/Amps/2006-07/msg01426.html (8,086 bytes)

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