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141. Re: [Amps] transformer secondary winding resistance here we go again (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 16 Jan 2004 22:51:58 +0000; Partain, Chuck wrote: Maybe I am missing something. If a transformer is able to handle the output current without getting hot or saturating and it meets the size requirement why is the secondary resi; /archives//html/Amps/2004-01/msg00169.html (8,126 bytes)
142. Re: [Amps] Power-off tube cooling (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 19 Jan 2004 08:55:50 +0000; Is not the junction where the metal pins travel through the ceramic base and/or glass of a power tube subject to a more rapid mean time between failure rate because of thermal stress? Would not a pow; /archives//html/Amps/2004-01/msg00186.html (10,664 bytes)
143. Re: [Amps] Drake L7 in need of TLC? Advice please! (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 24 Jan 2004 21:18:39 +0000; M1AQV wrote: Hi all, Im new here so please forgive me if these questions have been asked before! I have recently purchased a Drake L7 amp, which I was told was in good working order but after some ex; /archives//html/Amps/2004-01/msg00256.html (11,862 bytes)
144. Re: [Amps] Alpha 87A troubles with fault 17 (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 25 Jan 2004 09:49:30 +0000; However, the FT-1000 genre of transceivers address the leading edge overshoot issue through the use of a fast ALC response time. What's the negative side-effect? CW clicks due to an unusually abrupt; /archives//html/Amps/2004-01/msg00262.html (12,535 bytes)
145. Re: [Amps] Tough valves? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 25 Jan 2004 09:52:57 +0000; Richard wrote: I will be transmiiting with my valve amplifier from my summer cottage this year which g me worried that transporting the amp (1xGU74) to and from my home to the cottage might not be th; /archives//html/Amps/2004-01/msg00263.html (7,985 bytes)
146. Re: [Amps] HV SAFETY QUESTION (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 26 Jan 2004 08:35:54 +0000; R. Measures wrote: ** Does anyone know of a case where the stored charge on the filter C proved to be deadly? There has been at least one attempt at an experiment, although history failed to record t; /archives//html/Amps/2004-01/msg00283.html (8,961 bytes)
147. Re: [Amps] Horizontal or verticle? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 26 Jan 2004 09:06:33 +0000; Richard wrote: There is a bit of debate between Polish and Ukrainian amp builders. The some members of the Polish school argue, based on some American literature, that a valve (ceramic) should be bas; /archives//html/Amps/2004-01/msg00284.html (9,341 bytes)
148. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 27 Jan 2004 10:24:44 +0000; R. Measures wrote: ** In a grounded-grids, tetrode amplifier, c. 75% of the total grid current flows in the control grid and c. 25% of the current flows in the screen grid. We need to be very careful; /archives//html/Amps/2004-01/msg00305.html (8,769 bytes)
149. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 28 Jan 2004 14:41:06 +0000; R. Measures wrote: R. Measures wrote: ** In a grounded-grids, tetrode amplifier, c. 75% of the total grid current flows in the control grid and c. 25% of the current flows in the screen grid. We need; /archives//html/Amps/2004-01/msg00327.html (11,352 bytes)
150. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 29 Jan 2004 19:46:18 +0000; R. Measures wrote: What Rich says is only true if both grids are connected directly to chassis (and even then, the current division between g1 and g2 will depend on the mu-g1g2 value for that particu; /archives//html/Amps/2004-01/msg00346.html (9,641 bytes)
151. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 31 Jan 2004 07:03:52 +0000; R. Measures wrote: ** Ian -- How does one convert this figure into a determination of how grid current divides between the grid and the screen during g-g operation? Sorry, maybe what I said was misle; /archives//html/Amps/2004-01/msg00364.html (9,428 bytes)
152. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 2 Feb 2004 15:16:00 +0000; R. Measures wrote: R. Measures wrote: ** Ian -- How does one convert this figure into a determination of how grid current divides between the grid and the screen during g-g operation? Sorry, maybe wh; /archives//html/Amps/2004-02/msg00015.html (9,015 bytes)
153. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 4 Feb 2004 07:47:02 +0000; R. Measures wrote: ** Indeed. ... getting back to g-g operation for a tube with a max. g1 rating of 2mA, I would not try it. Even with a stripe-cathode and aligned grid, typical grid currents are c.; /archives//html/Amps/2004-02/msg00028.html (9,015 bytes)
154. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 4 Feb 2004 17:49:54 +0000; R. Measures wrote: you can safely operate *any* tetrode in class AB1, cathode-driven. The requirement is that the control grid has the correct negative bias, and the screen has the correct positive v; /archives//html/Amps/2004-02/msg00033.html (9,758 bytes)
155. Re: [Amps] Re: matching network (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 5 Feb 2004 16:48:09 +0000; wrote: I have heard the term "super cathode drive" many times but have not seen an explanation of what it means. A Google search turns up links that mention super cathode drive and G2DAF circuits but; /archives//html/Amps/2004-02/msg00038.html (8,548 bytes)
156. Re: [Amps] tube cooling (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 16 Feb 2004 20:03:01 +0000; Mark Beckwith wrote: Vic, you're the second person to make this observation, so I am taking seriously the thought that MY alpha may be the odd one. I am checking into a few things. My Alpha has the "; /archives//html/Amps/2004-02/msg00138.html (11,621 bytes)
157. Re: [Amps] tube cooling (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 17 Feb 2004 23:44:30 +0000; Gary Schafer wrote: Ian White, G3SEK wrote: Turbulence is vital for effective cooling. If the air flow over a hot surface is gentle (laminar) there is always a stagnant boundary layer of hot air whic; /archives//html/Amps/2004-02/msg00156.html (11,821 bytes)
158. Re: [Amps] tube cooling (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 19 Feb 2004 11:25:03 +0000; Gary Schafer wrote: You missed the point. Again: "You can have as much turbulence sucking air as you can by blowing it." This is the key: "It depends on the speed of the air and the surface that the; /archives//html/Amps/2004-02/msg00178.html (11,906 bytes)
159. Re: [Amps] muffin fans (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 24 Feb 2004 20:52:32 +0000; Partain, Chuck wrote: anyone ever do any studies about muffin fans for cooling BIG tubes? I have a decent size blower I'm going to use on my amp (gu-84b) and wondered if there was a smaller fan (I'm; /archives//html/Amps/2004-02/msg00229.html (8,386 bytes)
160. Re: [Amps] Grounded B+ amplifier (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 27 Feb 2004 17:28:14 +0000; Steve Thompson wrote: On Thursday 26 February 2004 17:33, Bill Turner wrote: Years ago I recall reading about an amplifier where the B+ supply was grounded and the cathode was "hot" with the B- suppl; /archives//html/Amps/2004-02/msg00293.html (9,435 bytes)

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