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References: [ +from:Ian: 2098 ] [ White: 4243 ]

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21. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 152): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 7 Jan 2001 00:06:00 +0000; Please don't get sucked into Rich's opportunistic personal attacks against Eimac staff. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co; /archives//html/Amps/2001-01/msg00223.html (10,734 bytes)
22. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 152): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 7 Jan 2001 10:07:21 +0000; He has now told us all... again. I agree that Eimac <as a company> made a mistake over C&F, and continues to make a mistake in not pulling those pages and re-thinking what needs to be done. But a mis; /archives//html/Amps/2001-01/msg00235.html (11,047 bytes)
23. [AMPS] High Power on 70cm - Possible? (score: 152): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 29 Jan 2001 07:53:50 +0000; That's too strong. Although it's true that Steve has now changed to the 3CPX800, for many years before the 3CPX became readily available he and others used the 3CX successfully at 1500W on 432. Advic; /archives//html/Amps/2001-01/msg00679.html (9,718 bytes)
24. [AMPS] Two Tone 2000 (score: 152): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 6 Dec 2000 00:07:54 +0000; If you're pulsing the composite signal, it would be important to have a range of rates to test the effects on power supply regulation. Probably 1Hz, 10Hz and 100Hz would be enough, and 50% duty cycle; /archives//html/Amps/2000-12/msg00087.html (8,793 bytes)
25. [AMPS] DC Filaments??? (score: 152): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 2 Nov 2000 16:36:03 +0000; To coin a phrase: [chortle]! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.contesting.com/FAQ/amps S; /archives//html/Amps/2000-11/msg00030.html (9,209 bytes)
26. [AMPS] SB-220 Glitch Resistor ??? (score: 152): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 29 Nov 2000 07:20:21 +0000; I agree with you that it's bad practice to use a small glitch resistor instead of an HV fuse. In the case I'm thinking of, the glitch resistor was sensibly rated for power dissipation in normal opera; /archives//html/Amps/2000-11/msg00426.html (11,034 bytes)
27. [AMPS] Testing HV Psu (score: 152): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 31 Aug 2000 14:06:14 +0100; Found the direct URL: http://www.mrs.bt.co.uk/dubus/9002-7.pdf 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: ht; /archives//html/Amps/2000-08/msg00576.html (8,508 bytes)
28. [Amps] ?: Bird Meter scale algorithm (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sat, 4 Jan 2003 11:26:13 +0000; Paste this function into Excel: I = 30 * (-7.378E-12W^6 + 2.547E-09W^5 - 3.407E-07W^4 + 2.248E-05W^3 - 8.188E-04W^2 + 2.692E-02W - 2.749E-05) where I = meter current (uA) W = power (on a 0-100W scale; /archives//html/Amps/2003-01/msg00036.html (7,714 bytes)
29. [Amps] Filter? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 9 Jan 2003 08:44:59 +0000; G4SWX has designed a range of highly effective RFI filters based on coax stubs - see: www.ifwtech.co.uk/g3sek/swxfiltr/swxfiltr.htm These filters fall into three groups: 1. Transmitter harmonic filte; /archives//html/Amps/2003-01/msg00069.html (8,287 bytes)
30. [Amps] New US distributor for G3SEK boards - Tom's Tubes (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sun, 19 Jan 2003 19:44:14 +0000; A some of you know, Down East Microwave is no longer handling my Triode and Tetrode Boards and kits in the USA. (DEM have been great folks to deal with, and it was a very amicable parting.) My new US; /archives//html/Amps/2003-01/msg00163.html (7,066 bytes)
31. [Amps] Q: Chimneys for 3-500/4-400?? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Wed, 4 Dec 2002 00:03:36 +0000; [...] A while ago, I made some rough measurements on the 3-500Z in an SB-1000, using thermal-sensitive labels on the glass. That amp has a 6in Muffin-type fan blowing across the tube, with the air ou; /archives//html/Amps/2002-12/msg00054.html (9,216 bytes)
32. [Amps] Meter Shunts (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Mon, 9 Dec 2002 12:00:03 +0000; Pretty close. Right values for the low-value resistors (which need to be power types), but the resistor in series with the meter is too high - your 1k has to include the meter's own internal resistan; /archives//html/Amps/2002-12/msg00154.html (10,519 bytes)
33. [Amps] re: Magic values for "Glitch" Resistors in HV Pwr Sply (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sun, 22 Dec 2002 19:56:01 +0000; Don't know where you might have read that, but it doesn't look like good advice, for two reasons... [This information comes from Eimac Bulletin #17 on 'Fault Protection', downloadable at: www.ifwtech; /archives//html/Amps/2002-12/msg00244.html (13,761 bytes)
34. [Amps] ICOM 756 PRO II or FT 1000 MP Field or Mk 5 ? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 24 Dec 2002 09:11:58 +0000; There's a head-to-head user review at: http://www.w8zr.com/markv/index.htm -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) Editor, 'The VHF/UHF DX Book' http://www.ifwtech.co.uk/g3sek; /archives//html/Amps/2002-12/msg00265.html (8,825 bytes)
35. [Amps] resistor (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 24 Dec 2002 09:06:35 +0000; I've "seen" both of those, when providing remote diagnostics for people using my Triode Board without an effective surge resistor. In one VHF amp, the air-wound RF choke was completely crunched up by; /archives//html/Amps/2002-12/msg00266.html (7,953 bytes)
36. [Amps] FT-1000D Band Data Jack (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sat, 28 Dec 2002 14:56:43 +0000; There is no "special tab" - the connector has an ordinary metal shell. If you're desperate, you can poke wires straight into the socket, and use the empty shell from any metal DIN plug to operate the; /archives//html/Amps/2002-12/msg00312.html (7,216 bytes)
37. [Amps] Re: [Amps] various parasitic sources... chassis, tubes, etc... (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Wed, 6 Nov 2002 14:32:28 +0000; The 8877 is well known as a *stable* tube for amplifiers at 50MHz and 144MHz. With the input and output both tuned to the same frequency, and typically 15-18dB of on-frequency gain, it's stable. If y; /archives//html/Amps/2002-11/msg00056.html (9,003 bytes)
38. [Amps] Re: [Amps] various parasitic sources... chassis, tubes, etc... (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Wed, 6 Nov 2002 16:26:24 +0000; On the contrary, every VHF/UHF amp I can think of has at least one parasitic resonance. For example... 50MHz pi- or pi-l: parasitic resonance above the operating frequency, for exactly the same reaso; /archives//html/Amps/2002-11/msg00059.html (11,992 bytes)
39. [Amps] G8GSQ only (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sun, 10 Nov 2002 14:11:48 +0000; Sorry to have to use the list for this: Steve - I've been trying to e-mail you direct at the qsl.net address, with no success. -- 73 from Ian G3SEK; /archives//html/Amps/2002-11/msg00156.html (6,204 bytes)
40. [Amps] Re: 8877 dissp (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 14 Nov 2002 07:51:46 +0000; To answer #2, it depends on the tube and the voltage reduction you have applied. Fortunately you can measure the recovery time - or the warm-up time from cold - by measuring the heater current. The h; /archives//html/Amps/2002-11/msg00221.html (8,828 bytes)

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