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1. Re: [Amps] re: Henry 6n2 dual band? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 15 Feb 2004 08:13:35 -0000; I think on 2 the tubes are in push pull, on 6 in parallel with the 2m circuits acting like extended connections between the tubes and the 6m matching circuits. If the web site storing pics of people'; /archives//html/Amps/2004-02/msg00111.html (7,469 bytes)
2. Re: [Amps] another zener question (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 15 Feb 2004 08:15:43 -0000; I doubt you'd notice the difference in practice. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2004-02/msg00112.html (7,207 bytes)
3. Re: [Amps] 4CX800 2 Meter Linear (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 16 Feb 2004 16:02:27 +0000; Not sure about what's happening with Ig1, but otherwise it reads as if the anode/plate load resistance is too low. Maybe the output coupling connection runs out of adjustment before getting to the ri; /archives//html/Amps/2004-02/msg00131.html (8,463 bytes)
4. Re: [Amps] FW: 6n2 (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Tue, 17 Feb 2004 09:47:47 +0000; That's the beast I was thinking of too. I wish I had the skill and patience to build something that good looking. Steve _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2004-02/msg00146.html (7,147 bytes)
5. Re: [Amps] PTFE fasteners or adhesive backed PTFE (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 25 Feb 2004 09:36:23 +0000; If you've a spare mortgage to spend, RS sell ceramic nuts, bolts and washers. I usually end up designing mounting arrangements that allow for brass screws, although I've heard of people using clear s; /archives//html/Amps/2004-02/msg00239.html (7,871 bytes)
6. Re: [Amps] Grounded B+ amplifier (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 27 Feb 2004 08:58:53 +0000; Doesn't it do a lovely job of offering an alternative insight into how a pi network matches between the antenna and plate. The load control is the lower capacitor and provides a variable 'tap' up and; /archives//html/Amps/2004-02/msg00275.html (7,954 bytes)
7. Re: [Amps] 2 x 8877 (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Mon, 1 Mar 2004 09:16:07 -0000; My guts tell me it's unlikely to be a problem. A modest viewing window is going to be a tiny fraction of a wavelength and thus a very inefficient radiator, and the energy in harmonics where it will r; /archives//html/Amps/2004-03/msg00001.html (7,497 bytes)
8. Re: [Amps] transistor specs ?? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 12 Mar 2004 09:30:37 +0000; TH430 is spec'd for 250W out from 50V supply. 30MHz - 14.5dB gain, -30dBc IMD at 250W pep class AB 30MHz - 13.5dB gain at 250W cw class C 70MHz - 10dB gain class C. If they're used in a broadband pus; /archives//html/Amps/2004-03/msg00124.html (7,454 bytes)
9. Re: [Amps] High SWR on 15 mtrs for SB220 - Follow-up (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 20 Mar 2004 08:49:06 -0000; Maybe the power sensor is broken, or someone tweaked it without understanding how to do it, or maybe it just never had decent directivity (too many like that around the place). Steve ________________; /archives//html/Amps/2004-03/msg00215.html (8,199 bytes)
10. Re: [Amps] Transformer taps (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Mon, 22 Mar 2004 08:42:24 +0000; I can't see a problem but it might be worth checking the insulation between the winding and the frame - I've seen transformers where there's minimal insulation between the centre tap and the core, pr; /archives//html/Amps/2004-03/msg00241.html (7,682 bytes)
11. Re: [Amps] microwave oven reused parts (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Wed, 24 Mar 2004 07:47:25 -0000; Collect a few together and they could be handy in the primary of a Tesla coil. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2004-03/msg00254.html (7,226 bytes)
12. Re: [Amps] SB-221 Why is the the variable load capacitor onlycrimpedto the ... (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Wed, 31 Mar 2004 08:50:45 +0100; In all the high reliability areas I've worked connectors are always crimped, not soldered - maybe for different reasons from the Heath amp, but I think many people are not aware of how good a properl; /archives//html/Amps/2004-03/msg00360.html (8,022 bytes)
13. Re: [Amps] off topic - loaded verticles ?? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Fri, 2 Apr 2004 08:22:45 +0100; You will find useful software at www.g4fgq.com Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2004-04/msg00007.html (7,442 bytes)
14. [Amps] Ion pump (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 3 Apr 2004 09:48:48 +0100; Can this do anything interesting and/or useful in a ham shack? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=3806522526 Steve _______________________________________________ Amps mailing list; /archives//html/Amps/2004-04/msg00018.html (6,532 bytes)
15. Re: [Amps] Interesting 4CX800A/GU-74B Russian Project (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 1 May 2004 11:08:54 +0100; Interesting that the guy says it's worked fine for years - I thought that this device was thought unsuitable for gg operation, with control grid dissipation specified at 2W max. Maybe something is lo; /archives//html/Amps/2004-05/msg00012.html (7,210 bytes)
16. Re: [Amps] plate E 3cx800A7/3CPX800A7 (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 16 Jun 2004 14:24:02 +0100; There's an app note on the Eimac web site about use at band 2 - they suggest the 3CPX version for places where the line voltage might vary a lot, setting the ht high so it's still able to put out the; /archives//html/Amps/2004-06/msg00078.html (7,341 bytes)
17. [Amps] OT - help needed (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 18 Jun 2004 10:10:45 +0100; I wonder if anyone here has access to service manuals for HP 8711/2/3/4 family of network analysers. I could use a little bit of schematic and/or a couple of part numbers. Yes, a transmitter got fed; /archives//html/Amps/2004-06/msg00095.html (6,296 bytes)
18. Re: [Amps] Operating position for ex-Soviet triodes? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 25 Jun 2004 17:16:00 +0100; If you visit http://www.ifwtech.co.uk/g3sek/misc/gs35g.jpg there's a picture of a (damaged) GS35B cathode/grid assembly. The same but /gs35a.jpg shows the corresponding anode. The cathode is a solid; /archives//html/Amps/2004-06/msg00124.html (8,321 bytes)
19. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 23 Jul 2004 15:47:10 +0100; Doesn't the screen current vary as the rf output varies from zero to peak at the beat frequency between the two tones? The meter reading will be steady because of inertia. Steve ____________________; /archives//html/Amps/2004-07/msg00161.html (8,090 bytes)
20. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Sat, 24 Jul 2004 15:42:00 +0100; I'm not talking about the screen voltage and the RF cycle - I'm talking about the screen current and audio frequencies that arise from the two tone test. If I wind the carrier power up and down, the; /archives//html/Amps/2004-07/msg00169.html (10,581 bytes)

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