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References: [ +from:G3SEK@ifwtech.demon.co.uk: 419 ]

Total 419 documents matching your query.

101. [AMPS] 4CX1600B Amplifier in new handbook (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 28 Nov 1999 21:36:57 +0000; Warning - it's not the same tube! The 4CX1600B is made by Svetlana in St Petersburg and has a pin base. The GS23b is made by a different company in the Ukraine and is a totally different tube. It has; /archives//html/Amps/1999-11/msg00538.html (9,547 bytes)
102. [AMPS] 4CX1600B Amplifier in new handbook (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 29 Nov 1999 19:40:41 +0000; Sorry, I don't have any further information. Your posting is the first I ever heard of the 4CX1600*A*. That would be an "export" designation anyway - would it be better known under the original Russi; /archives//html/Amps/1999-11/msg00545.html (9,560 bytes)
103. [AMPS] Conjugate matching and amplifiers (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 2 Oct 1999 00:18:20 +0100; Not necessarily either of the above. For example we often load more heavily than the position for maximum power output/efficiency in order to improve the IMD performance. And there isn't even a singl; /archives//html/Amps/1999-10/msg00042.html (8,683 bytes)
104. [AMPS] G3RZP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 4 Oct 1999 07:16:48 +0100; It's about a week since he called, but he's home and recovering slowly. For a start, he has to grow some muscle to fill up the hole in his right leg. Although he is managing to drive to the doctor's; /archives//html/Amps/1999-10/msg00094.html (8,016 bytes)
105. [AMPS] WTB B+ xformer etc (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 11 Oct 1999 09:06:15 +0100; You'll see a comfortable 1500W at 3500V on-load, so 4000V off-load and about 3800V key-up (150mA) sounds good. But 100uF is way too much - about 30uF will be plenty. The extra capacitance will only s; /archives//html/Amps/1999-10/msg00356.html (8,212 bytes)
106. [AMPS] Safety resistor (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 11 Oct 1999 20:00:38 +0100; The resistor is there to keep the B-minus rail somewhere close to ground (chassis) potential, even if the high voltage supply is operated separately from the rest of the amplifier. Without it, the wh; /archives//html/Amps/1999-10/msg00382.html (9,620 bytes)
107. [AMPS] Safety resistor (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 12 Oct 1999 06:33:59 +0100; Exactly! Nothing to argue about, then. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3sek -- FAQ on WWW: http://www.contest; /archives//html/Amps/1999-10/msg00394.html (7,906 bytes)
108. [AMPS] G3RZP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 4 Sep 1999 14:22:32 +0100; In case anyone has been wondering where Peter, G3RZP has disappeared to, he's in hospital with a major and painful leg infection. He is making good progress, but it will be some time before he is bac; /archives//html/Amps/1999-09/msg00019.html (6,859 bytes)
109. [AMPS] G3RZP, W0AIH health reports (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 6 Sep 1999 07:29:50 +0100; I spoke briefly to Peter on Sunday, and he is beginning to get better - but it certainly was serious, involving midnight emergency surgery about 10 days ago. It will be several weeks before he's back; /archives//html/Amps/1999-09/msg00030.html (8,498 bytes)
110. [AMPS] G3RZP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 9 Sep 1999 22:47:27 +0100; Peter telephoned this afternoon. He's a lot brighter than four days ago. He sends you thanks for all the good wishes, but it will be some weeks before he's back in circulation - there are various mat; /archives//html/Amps/1999-09/msg00070.html (6,954 bytes)
111. [AMPS] Bleeders (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 10 Sep 1999 23:41:30 +0100; wrote: Fair Radio has plenty of 100K 95W. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3sek -- FAQ on WWW: http://www.cont; /archives//html/Amps/1999-09/msg00080.html (7,156 bytes)
112. [AMPS] New Triode Board from G3SEK (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 15 Sep 1999 11:38:03 +0100; [This is a one-time announcement.] The Triode Board is a new solution to the control and protection of triode power amplifiers. It follows the same successful formula as G3SEK's Tetrode Boards: all t; /archives//html/Amps/1999-09/msg00117.html (8,726 bytes)
113. [AMPS] New Triode Board from G3SEK (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 15 Sep 1999 21:46:32 +0100; I don't want to get into the debate about what causes this gold sputtering - for the purposes of power supply design, it's enough to know that large current surges can and do occur. We also agree tha; /archives//html/Amps/1999-09/msg00125.html (9,472 bytes)
114. [AMPS] New Triode Board from G3SEK (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 15 Sep 1999 21:40:13 +0100; It probably CAN "handle tubes with handles" - but they haven't been tested yet. The tubes named on the web page are those with which the board has actually been tested, so far. I'd be happy to add ot; /archives//html/Amps/1999-09/msg00126.html (8,515 bytes)
115. [AMPS] New Triode Board from G3SEK (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 16 Sep 1999 07:57:24 +0100; No, a stack of 1000-1200V devices, triggered by opto-couplers. There's a description by OE5JFL in http://www.qsl.net/ok1cdj/dubus/9002-7.pdf Excess anode current switches off the mains by a solid-sta; /archives//html/Amps/1999-09/msg00132.html (8,928 bytes)
116. [AMPS] Silver Plating question (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 18 Sep 1999 16:54:25 +0100; It's unlikely that you would see much - if any - improvement in efficiency in a typical VHF "cavity" amp. The places where conductivity is the most important are the parts carrying the highest curren; /archives//html/Amps/1999-09/msg00159.html (11,187 bytes)
117. [AMPS] Silver Plating question (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 19 Sep 1999 08:54:57 +0100; You're right, Rich - but only for the pure materials. Unfortunately even "pure" doesn't cover it: there's a difference in resistivity between pure hard-drawn and pure soft-drawn copper owing to the c; /archives//html/Amps/1999-09/msg00167.html (10,008 bytes)
118. [AMPS] Silver Plating question (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 19 Sep 1999 17:38:39 +0100; Terman, writing before WW2, used "ohms per centimeter cube" (the correct form of this older term) but that has been outdated for several decades since rational systems of units were devised. As for "; /archives//html/Amps/1999-09/msg00169.html (9,210 bytes)
119. [AMPS] Silver Plating question (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 20 Sep 1999 06:37:30 +0100; No it doesn't. Allow me to stretch your "cubic centimeter" of copper into a mile of thin wire... 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.i; /archives//html/Amps/1999-09/msg00176.html (8,466 bytes)
120. R: [AMPS] Silver Plating question (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 20 Sep 1999 22:36:23 +0100; QRO is a good test - any losses are easy to notice. It seems like the available silver plating really was better than the available copper (and probably neither was "textbook pure"). OK, I'll cheerfu; /archives//html/Amps/1999-09/msg00188.html (10,039 bytes)

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