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1. Re: [Amps] pink ceramics (score: 74): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 21 Aug 2003 08:35:51 +0100; John T. M. Lyles wrote: Pink ceramic was high in magnesium content I believe. From http://www.svetlana.com/docs/tubeFAQ.html Q. Why is your ceramic pink? A. Svetlana ceramic power tubes are manufactu; /archives//html/Amps/2003-08/msg00002.html (8,412 bytes)
2. [Amps] Microwave oven? (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Jul 29 23:01:47 2003; In effect they make the transformer current-limiting, and indeed you don't want that. The slugs were force-fitted, so with a hammer and a big punch you can drive them out. True, but it still leaves e; /archives//html/Amps/2003-07/msg00153.html (8,114 bytes)
3. [Amps] Dubus and Ham Radio Magazine (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Jul 1 09:49:31 2003; Thanks for those kind words, Skipp! DUBUS really doesn't aim to become as great as Ham Radio once was - the coverage is limited to VHF/UHF/microwave DX and related topics, but in that specialized are; /archives//html/Amps/2003-07/msg00175.html (8,651 bytes)
4. [Amps] New Vacuum Relay Supplier (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Mon Jun 2 08:07:35 2003; The RJ1A is rated at 8 milliseconds max open or close, and the Kilovac HC-1 at 6ms max. The GH1 is rated at 6ms but it doesn't say whether this is maximum or typical. All these figures are when opera; /archives//html/Amps/2003-06/msg00000.html (8,966 bytes)
5. [Amps] New Vacuum Relay Supplier (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Jun 3 08:32:55 2003; [...] That's the value I'm using for QSK. I'm not using either a clamping diode or a .1uF, because a nice feature of this circuit is that the speedup cap absorbs the spike on 'break'. I measured pret; /archives//html/Amps/2003-06/msg00014.html (13,169 bytes)
6. [Amps] Coax jumper (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sat Jun 14 08:46:37 2003; What really gets warm is the center conductor - you don't feel it from the outside, but it softens the polyethylene. If there is a permanent sharp bend in the cable, the problem is a very slow migrat; /archives//html/Amps/2003-06/msg00085.html (9,469 bytes)
7. [Amps] GS-35 being cantankerous (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Jun 24 08:56:11 2003; That's a sure sign of a large current pulse through the choke, generating magnetic forces which try to pull the turns together. That may say as much about the fuse as anything else :-) It has been di; /archives//html/Amps/2003-06/msg00192.html (8,739 bytes)
8. [Amps] electronic switching (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Jun 24 08:56:17 2003; When thinking about new features for the next-generation Triode Board, I surveyed a number of CW users about QSK (ie the full listen-between-the dots facility). The overall conclusion wasn't too surp; /archives//html/Amps/2003-06/msg00193.html (11,260 bytes)
9. [Amps] G3SEK Triode Control Board (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sun Apr 6 14:46:51 2003; Please forgive this comment about my own product, but the message above could leave an incorrect impression. An 'instant-on' tube doesn't need the warm-up timer on my board, but it does benefit from; /archives//html/Amps/2003-04/msg00056.html (7,334 bytes)
10. [Amps] G3SEK Triode Control Board (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sun Apr 6 16:24:38 2003; Hello Bob No problem at all - in fact you did me a favor... As far as I know, you would be my first 'instant-on' tetrode user (they're much less common than filament triodes) so this has made me upda; /archives//html/Amps/2003-04/msg00058.html (7,418 bytes)
11. [Amps] GS35B Bias (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Thu Apr 10 12:47:28 2003; About 35V. There's a circuit on my site, at http://www.ifwtech.co.uk/g3sek/boards/triode/an5-1.0.pdf which is probably cheaper than a large zener and gives adjustable regulation. 100mA idling is a bi; /archives//html/Amps/2003-04/msg00098.html (6,923 bytes)
12. [Amps] Derating factor for photoflash capacitors (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Mon Apr 14 07:44:28 2003; Yes, bin them - now. At 2.5kV they will work well for maybe two years of intermittent use, and then suddenly fail dead-short. There's no drama, nothing bursts and AFAIK they don't contain PCBs anyway; /archives//html/Amps/2003-04/msg00133.html (8,634 bytes)
13. [Amps] Re: PS project part2 (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Wed Apr 16 05:23:47 2003; There's also something strange happening... You'd imagine that the RCD should be a simple passive device, immune to RF, because it's basically a mains transformer. The primary is bifilar, and normall; /archives//html/Amps/2003-04/msg00166.html (10,110 bytes)
14. [Amps] Why hasn't solid state replaced tubes? (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Mar 4 12:38:43 2003; That's the key question, because you have been talking all the time about 3rd order IMD, which is close to and underneath the speech signal itself. As you increase the drive level, various orders of; /archives//html/Amps/2003-03/msg00112.html (11,210 bytes)
15. [Amps] Mistakes (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Mar 4 12:38:53 2003; Rich, we're getting this stuff several times a day from you. Please stop. You keep changing what you say he said, so whatever he once might *really* have said has gone way beyond being interesting to; /archives//html/Amps/2003-03/msg00113.html (9,819 bytes)
16. [Amps] Mistakes (score: 79): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Mar 4 13:40:06 2003; For example, the paragraph before that should have said "that he DIDN'T really mean." It's OK, the gas has gone now... the getter got it. -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB; /archives//html/Amps/2003-03/msg00116.html (8,885 bytes)
17. [Amps] Why hasn't solid state replaced tubes? (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Wed Mar 5 03:54:15 2003; Often it doesn't, because the only IMD you'd hear inside the normal receiver passband would be coming from the low-frequency components of the speech signal, and would be covered by the higher-freque; /archives//html/Amps/2003-03/msg00154.html (13,483 bytes)
18. [Amps] Why hasn't solid state replaced tubes? (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Wed Mar 5 08:42:44 2003; Funny how these people want you to fix their rig, but always think they know best about the power pot... We had one of those locally, a few years ago. Whatever we told him, and however we returned th; /archives//html/Amps/2003-03/msg00166.html (10,748 bytes)
19. [Amps] Why hasn't solid state replaced tubes? (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Wed Mar 5 08:42:51 2003; Zyg Skrobanski had written: I replied: What I had meant to say was the audio frequencies <of the received 100% on that. Absolutely. Let me quote at a little more length from the web page, at: http://; /archives//html/Amps/2003-03/msg00167.html (13,165 bytes)
20. [Amps] Re: IM Distortion (score: 74): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Wed Mar 5 11:29:32 2003; wrote: I don't think that the frequencies alone is enough. You'd also have to vary the amplitudes at each frequency... and then the test protocol starts to become messy. The other point that hasn't b; /archives//html/Amps/2003-03/msg00184.html (10,022 bytes)

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