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161. [AMPS] Alpha 76 and 78 tube conversions (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 2 Feb 2002 15:13:43 +0000; Part of the problem with using a GI7 as a 3CX400 substitute in an existing amp is the massive sand-cast anode cooler, which takes up a lot of space and is really not very efficient - it only works be; /archives//html/Amps/2002-02/msg00023.html (11,672 bytes)
162. [AMPS] mini Teflon coax, the white stuff (score: 206): Author: brian.kline@hybrid.com (brian.kline@hybrid.com); Date: Tue, 12 Feb 2002 01:33:16 -0800; This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --_=_NextPart_001_01C1B3A8.4C79C190 Content-Type: text/plain Hi; /archives//html/Amps/2002-02/msg00101.html (24,647 bytes)
163. [AMPS] gs35 internals (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 18 Feb 2002 07:28:38 +0000; Yup, they're there. Love that tea-strainer grid - real agricultural engineering! In more detail, please can you confirm which (if any) of the arcs has either (a) holed the grid, (b) marked the cathod; /archives//html/Amps/2002-02/msg00179.html (7,854 bytes)
164. [AMPS] gs35 internals (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 18 Feb 2002 11:30:57 +0000; Thanks, Steve... very interesting. It confirms that arcs from anode to grid do affect the cathode underneath as well. Any idea how the tube went dud? Did it ever work, or might it have been soft on a; /archives//html/Amps/2002-02/msg00184.html (7,962 bytes)
165. [AMPS] mof resistors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 23 Feb 2002 23:52:22 +0000; In Europe, small resistors are available in both carbon film (cheaper, higher tolerance) and metal film (a little more expensive but also closer tolerance). Medium power (1-3W) are almost exclusively; /archives//html/Amps/2002-02/msg00252.html (10,885 bytes)
166. [AMPS] test (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 12 Jan 2002 08:47:43 +0000; Maybe we all made a New Year's resolution to take the nice pink tablets every day? Don't worry - it won't last. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (; /archives//html/Amps/2002-01/msg00086.html (7,363 bytes)
167. [AMPS] amplifier help (score: 147): Author: Ian White <g3sek@ifwtech.com> (Ian White); Date: Wed, 16 Jan 2002 13:23:43 +0000; Forwarded from Steve, G8GSQ: When I worked making rf power transistors, 'pill' was used to describe the piece of BeO when it wasn't attached to the mounting flange. Skipp's comments were pretty compr; /archives//html/Amps/2002-01/msg00111.html (8,096 bytes)
168. [AMPS] pills and rc feedback (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 22 Jan 2002 08:23:45 +0000; ...in a subtle move to give anti-spam services a bad name? Well, it almost fits the facts. My ISP was another victim of this useless "service". SpamCop blocks mail from any ISP server that has been u; /archives//html/Amps/2002-01/msg00160.html (8,875 bytes)
169. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 Jan 2002 09:43:47 +0000; There are several downloadable articles at: http://www.ifwtech.com/g3sek/boards/tetrode/tetrode-3.htm MOSFETs are better than bipolars for this application, because they don't suffer from second brea; /archives//html/Amps/2002-01/msg00195.html (9,278 bytes)
170. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 Jan 2002 18:58:31 +0000; Failures, you can never discount! It's very bad design to operate semiconductors from rail voltages that are above their breakdown voltage - even if they're never "supposed" to see that full voltage.; /archives//html/Amps/2002-01/msg00207.html (9,515 bytes)
171. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 09:49:54 +0000; It doesn't make sense to spend money on a high-power, high-voltage zener (don't forget the heatsink) when you can uprate the shunt MOSFET for much less cost. The only exception would be if you insist; /archives//html/Amps/2002-01/msg00216.html (10,811 bytes)
172. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 14:31:06 +0000; We're trying to solve two different problems here. One is transients, and all the methods Tom proposes are workable. For this particular application my own preference is Varistors, but it's no big de; /archives//html/Amps/2002-01/msg00229.html (11,495 bytes)
173. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 19:35:07 +0000; Depends what you want the zeners to achieve - spike protection or something longer-term. That implies you were drawing less than 10mA total, to supply the screens for two tubes *and* bleed a keep-ali; /archives//html/Amps/2002-01/msg00232.html (12,610 bytes)
174. [AMPS] Shunt regulated high voltage psu (score: 151): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 19:58:55 +0000; Thanks, Marv - I'm pleased to learn it can be done reliably. Is this with an active regulator or with zeners? -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RS; /archives//html/Amps/2002-01/msg00233.html (10,501 bytes)
175. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 07:41:29 +0000; You forgot to add the engineering know-how to make it work... and that's priceless. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com; /archives//html/Amps/2002-01/msg00248.html (9,855 bytes)
176. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 08:05:45 +0000; I usually trim my quotes, but couldn't leave out any part of that good stuff. It shows that an idea that I'd though un-promising can be made to work well and reliably, but that's because Marv has the; /archives//html/Amps/2002-01/msg00249.html (13,615 bytes)
177. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:36:36 +0000; I should have said "won't cut it on their own" - and that rather proves the point. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/; /archives//html/Amps/2002-01/msg00260.html (10,648 bytes)
178. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:56:04 +0000; I am the only person in the world who sells such boards. If you have a specific accusation, then put up or back down. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for Ra; /archives//html/Amps/2002-01/msg00261.html (9,721 bytes)
179. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:51:34 +0000; There doesn't seem to be any real need for an active series element to feed an active MOSFET shunt regulator. The loop gain in the shunt part is already very high, so the series feed can be just a pl; /archives//html/Amps/2002-01/msg00262.html (11,451 bytes)
180. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:35:12 +0000; Not unless you have some very special iron. The anode-cathode voltage comes from two separate stacked power supplies, connected at the screen (chassis). Therefore the "anode" and "screen" supplies ea; /archives//html/Amps/2002-01/msg00263.html (10,880 bytes)

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