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References: [ +from:g3sek@ifwtech.co.uk: 291 ]

Total 291 documents matching your query.

101. Re: [Amps] Metcal soldering iron and microscopes (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Wed, 17 Sep 2003 06:31:39 +0100
Obviously, any gadget that operates by **RF POWER** can't be bad... but what's especially good about soldering with a Metcal? -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) Editor, 'T
/archives//html/Amps/2003-09/msg00150.html (8,305 bytes)

102. Re: [Amps] Teflon Chimneys (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Wed, 17 Sep 2003 07:02:20 +0100
Chris Bartram wrote: Back in the mists of time I built a K2RIW PA for 432MHz. That used a pair of 4CX250BMs in parallel with a reverse airflow system, and would seriously endstop a 1kW Bird slug in c
/archives//html/Amps/2003-09/msg00151.html (10,299 bytes)

103. Re: [Amps] Challenger 3 amplifier (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sun, 28 Sep 2003 11:46:57 +0100
I came accross the Challenger 3 amplifier last night on the internet. Does anyone know were you can get the Toroidal power transformers like the ones used in these units? Linear Amp UK will sell you
/archives//html/Amps/2003-09/msg00196.html (7,567 bytes)

104. Re: [BULK] - [Amps] NCL 2000? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Wed, 1 Oct 2003 09:13:07 +0100
Steve Katz wrote: I've had the same set of Eimac 7203/4CX250Bs in my two meter amplifier since 1981. Run it with Ep = 2500V, Eg2 = 350V, lots of air, and 1 kW PEP output power for, oh, about 10,000 h
/archives//html/Amps/2003-10/msg00011.html (9,634 bytes)

105. Re: [Amps] Conditioning Spare Tubes After Storage (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 14 Oct 2003 15:46:57 +0100
SM0EJR 'Joe' wrote: I have had some experience in this.... After buying a few different russian tubes....(GU-43B, GS-35B, GU-84B, GI-6B/7B). I've made some tests: I have about 10 of each type, except
/archives//html/Amps/2003-10/msg00122.html (14,002 bytes)

106. Re: [Amps] a BANG in the AMP ? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sun, 19 Oct 2003 14:14:42 +0100
rlm wrote: On Saturday, October 18, 2003, at 04:52 AM, ON4MA Marc wrote: When a switched on the commander 2500 a loud bang whas heard somewhere in the rfdeck. The main fuse from the shack was out ! I
/archives//html/Amps/2003-10/msg00175.html (9,974 bytes)

107. Re: [Amps] a BANG in the AMP ? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 20 Oct 2003 09:14:30 +0100
Bill Turner wrote: Blowing the fuse, which IIRC is what happened to the original poster. I had that happen once in my SB-1000 that had sat for about four years. As soon as I turned it on there was a
/archives//html/Amps/2003-10/msg00186.html (9,385 bytes)

108. Re: [Amps] a BANG in the AMP ? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 20 Oct 2003 16:17:46 +0100
rlm wrote: my guess is that the tube took off on its own. Took off, the moment he first switched on? 3CX800s have a three-minute warmup, so maybe not... ** agreed. So maybe it needs an exorcist? No,
/archives//html/Amps/2003-10/msg00189.html (9,669 bytes)

109. [Amps] Re: Ionized Gas in the Tube (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 21 Oct 2003 07:19:30 +0100
Pat Barthelow wrote: Is the location of the glow important? I used to see Blue glow on the inside glass of 4-400A amps, and was once told that this is normal, and not indicative of Gas in the tubes.
/archives//html/Amps/2003-10/msg00198.html (9,908 bytes)

110. Re: [Amps] Ionized Gas in the Tube (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 21 Oct 2003 15:56:26 +0100
...Ian .... Have you got that information documented anywhere? Sorry, no. However, it might be found in some 1920s-30s book on popular science or vacuum technique. -- 73 from Ian G3SEK 'In Practice'
/archives//html/Amps/2003-10/msg00209.html (8,148 bytes)

111. Re: [Amps] Water cooling heat exchanger approaches (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 3 Nov 2003 16:38:58 +0000
I am working on the water cooling apparatus for a N6CA 1/4 KW 23 cm amp. In his article, he talks of using a "small transmission oil cooler" for the heat exchanging function. Does anyone that has don
/archives//html/Amps/2003-11/msg00028.html (7,967 bytes)

112. Re: [Amps] About single 4CX250b output power (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 3 Nov 2003 16:48:30 +0000
Mike Tubby wrote: Page 65 of Eimac's "Care and feeding of power grid tubes" shows a selection guide for SSB service for which the 4CX250B is listed as being capable of 348W "useful power output" in A
/archives//html/Amps/2003-11/msg00029.html (8,014 bytes)

113. Re: [Amps] About single 4CX250b output power (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Tue, 4 Nov 2003 18:20:21 +0000
Helge wrote: Ian, I guess you know this already, so it's for information. "only -19dB and quite irresponsible by implying that level of IMD is fit to be put on the air". I may agree, but it depends.
/archives//html/Amps/2003-11/msg00041.html (10,326 bytes)

114. Re: [Amps] 4CX1600B (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Wed, 12 Nov 2003 09:09:49 +0000
R. Measures wrote: Yo 4CX1600B owners After many years of faithful service, (rode hard, put away wet), my QRO 3k amp "banged" during the WW. Easy repair, the bridge rectifier for the -160 VDC control
/archives//html/Amps/2003-11/msg00160.html (10,817 bytes)

115. Re: [Amps] 4CX1600B (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 13 Nov 2003 13:37:54 +0000
R. Measures wrote: The bang would have come from the external circuit, where that same large current was also flowing (for example from a fuse blowing). ** I don't buy it because with 0V on the grid,
/archives//html/Amps/2003-11/msg00167.html (9,198 bytes)

116. Re: [Amps] 4CX1600B (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 14 Nov 2003 18:05:23 +0000
R. Measures wrote: R. Measures wrote: The bang would have come from the external circuit, where that same large current was also flowing (for example from a fuse blowing). ** I don't buy it because w
/archives//html/Amps/2003-11/msg00175.html (12,808 bytes)

117. Re: [Amps] Drake L-7 failure...amp vs L7-PS power supply? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Sat, 15 Nov 2003 07:13:32 +0000
Michael Tope wrote: A number of amplifier gurus recommend that this be replaced with a high voltage globar type glitch resistor (10 to 30 ohms). Specifically, Guru Eimac: http://www.cpii.com/eimac/ab
/archives//html/Amps/2003-11/msg00184.html (8,162 bytes)

118. Re: [Amps] L-7 Failure, HV fuses (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Mon, 17 Nov 2003 07:43:19 +0000
R. Measures wrote: Re HV fuses: I have seen in the literature descriptions of a HV fuse made by inserting into the B+ line, a 30 guage Cu wire approx 2" long. suspended between two ceramic standoffs
/archives//html/Amps/2003-11/msg00224.html (9,305 bytes)

119. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Thu, 20 Nov 2003 08:00:58 +0000
G3RZP wrote: It's not usual to provide 3 phase mains in the UK to domestic premises. Some country areas have 2 phase - that's what I have. There's an 11kV 3 phase line to a transformer near the house
/archives//html/Amps/2003-11/msg00287.html (11,816 bytes)

120. Re: [Amps] AC or DC better for indirectly heated cathodes? (score: 1)
Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
Date: Fri, 21 Nov 2003 11:34:22 +0000
R. Measures wrote: On Wednesday 19 November 2003 13:09, A.J Moss wrote: snip If I were to make a floating adjustable regulated DC supply, I could use an ordinary pot to control the heater volts, mete
/archives//html/Amps/2003-11/msg00303.html (10,463 bytes)

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