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321. Re: [Amps] construct ferrite "line isolator" (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 27 Oct 2010 18:10:13 +0100; Only comets and children :-) In that wider world, "Pin 1 problem" just doesn't work as a descriptive term. Nobody can begin to guess what it means, unless they already *know* the answer. It is no dis; /archives//html/Amps/2010-10/msg00414.html (11,754 bytes)
322. Re: [Amps] time to death... (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 11 Nov 2010 18:40:19 +0000; Let me guess, now... you don't have a cat? -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont; /archives//html/Amps/2010-11/msg00156.html (7,275 bytes)
323. Re: [Amps] Building a Mock Up (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 18 Nov 2010 07:31:40 +0000; Another use for a cardboard box prototype is to check the air flow through the blower and tube/socket. This can save a lot of grief later on! A simple method of measuring volume flow is to time how; /archives//html/Amps/2010-11/msg00329.html (8,450 bytes)
324. Re: [Amps] Tube Cooling.. (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 27 Nov 2010 08:06:44 +0000; Do you really mean "downward through the anode cooler", Carl? A very common method for cooling VHF/UHF amps is to blow cold air into the enclosed anode cavity, so the only way out is upward through a; /archives//html/Amps/2010-11/msg00508.html (9,373 bytes)
325. Re: [Amps] Tube Cooling.. (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 27 Nov 2010 16:53:38 +0000; So the entire anode cavity fills up with hot air... Collins contributed many excellent ideas to the amplifier gene pool, but that certainly wasn't one of them. -- 73 from Ian GM3SEK http://www.ifwtec; /archives//html/Amps/2010-11/msg00512.html (9,338 bytes)
326. Re: [Amps] Tube Cooling.. (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 27 Nov 2010 23:53:55 +0000; OK - if it works well enough, then it works. The point I was trying to make was that there are better ways. Most designers recognise that heating of the cavity is a major source of tuning drift, espe; /archives//html/Amps/2010-11/msg00521.html (9,271 bytes)
327. Re: [Amps] Don't do this (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 19 Dec 2010 07:51:40 +0000; Alternatively, use a low-value resistor in series with the current path, and configure the meter as a voltmeter using a 'multiplier' resistor in series. The protection diodes are then connected in pa; /archives//html/Amps/2010-12/msg00237.html (9,126 bytes)
328. Re: [Amps] Don't do this (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 20 Dec 2010 08:29:11 +0000; Granted - for those particular meters in that particular amplifier. Carl and I are approaching the problem from two different directions. He repairs many examples of the same models with the same fau; /archives//html/Amps/2010-12/msg00280.html (8,454 bytes)
329. Re: [Amps] Fuses (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 8 Jan 2011 08:34:30 +0000; A fuse provides NO current limiting until it blows; and a breaker provides NO current limiting until it breaks. A lot of damage can be done in those first few milliseconds, which is why the fuse/brea; /archives//html/Amps/2011-01/msg00076.html (8,828 bytes)
330. Re: [Amps] Fuses (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 8 Jan 2011 14:40:58 +0000; The usual technique is to apply a crowbar short across the valuable tube, while other, slower, circuits are shutting down the rest of the power supply. The voltage is a bit high for a thyristor crowb; /archives//html/Amps/2011-01/msg00086.html (9,676 bytes)
331. Re: [Amps] GI-7bT amplifier (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 11 Jan 2011 08:02:00 +0000; This page is a central resource for information about Russian tubes: <http://www.nd2x.net/base-1.html> Half-way down, there are tables of designs for various triodes and tetrodes including the GI-7B.; /archives//html/Amps/2011-01/msg00121.html (10,829 bytes)
332. Re: [Amps] Transformer-LESS advice (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 15 Jan 2011 08:17:41 +0000; W9QQ died a few years ago. The Watts Unlimited company does not seem to be active, but the design rights to the HV switcher must still belong to somebody. Although a number of these HV switchers were; /archives//html/Amps/2011-01/msg00150.html (8,219 bytes)
333. Re: [Amps] G3SEK Triode Board kit with parts (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 31 Mar 2011 16:26:14 +0100; "NOS" is no problem, as the Triode Board Kit hasn't changed recently. The current version of the User Manual is always available on the website below, and the new owner is welcome to contact me for t; /archives//html/Amps/2011-03/msg00293.html (7,957 bytes)
334. Re: [Amps] what is a 4 wire 240VAC service (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 6 Apr 2011 21:44:29 +0100; Both sides agree on the reason for this: "We have a perfectly good standard. You people over there weren't listening!" -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek ___________________________; /archives//html/Amps/2011-04/msg00249.html (8,517 bytes)
335. Re: [Amps] what is a 4 wire 240VAC service (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 7 Apr 2011 07:25:38 +0100; I know, I married one :-) -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma; /archives//html/Amps/2011-04/msg00273.html (8,637 bytes)
336. Re: [Amps] QRO-PARTS.com very rude behavior (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 11 Apr 2011 09:20:39 +0100; But be careful who you ditch, as there are several other suppliers with quite similar names. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps; /archives//html/Amps/2011-04/msg00326.html (8,678 bytes)
337. Re: [Amps] Alpha vs Henry (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 11 Apr 2011 09:04:53 +0100; Air flow rate is what really matters in cooling, and all data sheets for air-cooled tubes will state the minimum volume flow rate required. Pressure drop is only an indirect way of measuring the volu; /archives//html/Amps/2011-04/msg00327.html (11,630 bytes)
338. Re: [Amps] Airflow meter (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 13 Apr 2011 19:04:09 +0100; I'm not sure if a peak flow meter will work, because of the back-pressure through the device itself. The bag method may look crude, but it has the advantage of a very low back pressure. To save you f; /archives//html/Amps/2011-04/msg00374.html (13,784 bytes)
339. Re: [Amps] Bag-o-meter calcs in US units (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 14 Apr 2011 08:24:26 +0100; That's exactly the right perspective, and you got the detailed method right too. Way back, I worked in a lab that was making very similar kinds of flow measurements to professional standards - and be; /archives//html/Amps/2011-04/msg00403.html (9,581 bytes)
340. Re: [Amps] Bag-o-meter calcs in US units (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 14 Apr 2011 08:31:48 +0100; No, Jim N7CXI had it right: let the blower come up to speed first, and *then* clap the deflated bag over the outlet. A simple cardboard adapter plate allows quick attachment without leaks. -- 73 from; /archives//html/Amps/2011-04/msg00404.html (8,393 bytes)

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