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181. Re: [Amps] Tuned power transformer (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 19 May 2004 07:26:40 +0100; Angel Vilaseca wrote: I am taking apart an old HV power supply made in the late '40s, probably in Germany. From its size, the power transformer should be rated for approximately 1 KW. It has an HV se; /archives//html/Amps/2004-05/msg00154.html (9,006 bytes)
182. Re: [Amps] Tuned power transformer (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 19 May 2004 18:25:28 +0100; Angel Vilaseca wrote: What is a power factor correction? What is its purpose? Viewed from the mains, the power supply typically looks like a load resistance in parallel with the inductance of the tra; /archives//html/Amps/2004-05/msg00163.html (9,477 bytes)
183. Re: [Amps] Re: Tuned power transformer (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 20 May 2004 07:49:47 +0100; Will Matney wrote: The best reference material I have found, and what I use, is a book published by Howard Sams named "Practical Transformer Design". It deals with every aspect of transformer, autotr; /archives//html/Amps/2004-05/msg00171.html (7,908 bytes)
184. Re: [Amps] Transformer book (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 22 May 2004 07:37:55 +0100; Will Matney wrote: Ian the ISBN number and other details are below. Hope this helps! Title: Practical Transformer Design Handbook Author: Eric Lowden Publisher: Howard Sams Publishing Date: 1980 Sams; /archives//html/Amps/2004-05/msg00195.html (7,447 bytes)
185. Re: [Amps] rebuilding glass tubes (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 5 Jun 2004 08:34:20 +0100; R. Measures wrote: On Jun 4, 2004, at 7:39 AM, Vic Rosenthal wrote: R.Measures wrote: ? Econco reportedly tried rebuilding 4-1000As but it proved to economically unfeasible. The advantage of ceramic-; /archives//html/Amps/2004-06/msg00023.html (9,440 bytes)
186. Re: [Amps] Glass Power Tube rebuilders (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 5 Jun 2004 09:27:47 +0100; John T. M. Lyles wrote: The problem that I have experienced with rebuilders is that they haven't been able to get the glass in sizes that used to be common, i.e., a blank in the size of a 3-1000Z dia; /archives//html/Amps/2004-06/msg00024.html (8,634 bytes)
187. Re: [Amps] Glass Power Tube rebuilders (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 6 Jun 2004 18:33:32 +0100; R. Measures wrote: John was clearly talking about other problems where there *was* a need to cut the tube apart. It's probably easier to melt a hole than to cut the glass. That's "metalwork thinkin; /archives//html/Amps/2004-06/msg00037.html (9,337 bytes)
188. Re: [Amps] E rating of PVC (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 13 Jul 2004 09:20:57 +0100; Lane Zeitler wrote: Need to homebrew a HV probe, can I use Schedule 20 or 40 pvc? Will it handle the E (4 kvdc). Yes, easily. However, a slim probe is *much* easier to use than a chunk of fat tubing.; /archives//html/Amps/2004-07/msg00060.html (8,265 bytes)
189. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 14 Jul 2004 08:29:23 +0100; Bill Fuqua wrote: I have thought about fabricating a device to protect tubes. Eimac claims that if your crow bar circuit will protect a piece of #30 copper wire under short conditions it will protect; /archives//html/Amps/2004-07/msg00075.html (9,772 bytes)
190. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 15 Jul 2004 23:08:05 +0100; What do you think about switching HV off with the vacuum relay ? Is it better than fuses/circuit breakers in the primaries of the PS transformer ? It doesn't need to be as fast as a vacuum relay. Wit; /archives//html/Amps/2004-07/msg00088.html (8,877 bytes)
191. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 17 Jul 2004 17:59:08 +0100; R. Measures wrote: What do you think about switching HV off with the vacuum relay ? Is it better than fuses/circuit breakers in the primaries of the PS transformer ? It doesn't need to be as fast as; /archives//html/Amps/2004-07/msg00101.html (11,140 bytes)
192. Re: [BULK] - [Amps] HF and 4cx250b's (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 17 Jul 2004 18:16:41 +0100; R. Measures wrote: On Jul 15, 2004, at 7:23 AM, Steve Katz wrote: 4CX250Bs require a regulated screen supply, making the PSU design more complex. ð However, the screen current is so low in a 4cx2; /archives//html/Amps/2004-07/msg00102.html (8,807 bytes)
193. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 19 Jul 2004 07:45:53 +0100; Oleg Skydan wrote: OK. Consider I have a 40 uF capacitor in the PS charged to 3000V (one that uses in the pulse laser PS). Will it be safe for electronic crowbar to discharge it ? Good call - you hav; /archives//html/Amps/2004-07/msg00115.html (10,349 bytes)
194. Re: [Amps] HV fuse (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 19 Jul 2004 17:44:02 +0100; Joe Subich, K4IK wrote: The US broadcast television transmitters using "inductive output tubes" (IOT) - essentially a single cavity output with a gridded electron gun - used triggered spark gaps to d; /archives//html/Amps/2004-07/msg00131.html (10,747 bytes)
195. Re: [Amps] Crowbar components (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 22 Jul 2004 07:20:42 +0100; Frank Goenninger wrote: Hi all on the list: There have now been several posts here pointing to http://www.qsl.net/oe5jfl/flashover.htm as a suitable crowbar circuit. I want to copy that one... When s; /archives//html/Amps/2004-07/msg00144.html (8,738 bytes)
196. Re: [Amps] Crowbar components (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 25 Jul 2004 21:31:25 +0100; Having been away for a few days, please excuse my replying to several points all together. Rich wrote: Frank -- Why go to the trouble of interrupting the flow of electric mains current by special mea; /archives//html/Amps/2004-07/msg00185.html (11,772 bytes)
197. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 25 Jul 2004 22:16:22 +0100; Will Matney wrote: Bill, The only problem is that the test tone signal is a constant peak to peak voltage no matter what the frequency. On the human voice, the peak to peak voltage would vary thus va; /archives//html/Amps/2004-07/msg00186.html (11,582 bytes)
198. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 27 Jul 2004 07:24:18 +0100; R. Measures wrote: "The real point is that even under these favorable conditions, a zener-regulated supply (with a capacitor) *still* produces notably more IMD than an electronically regulated consta; /archives//html/Amps/2004-07/msg00208.html (9,316 bytes)
199. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 29 Jul 2004 12:13:30 +0100; Will Matney wrote: The very worst problem of IMD is the 120 Hz ripple that's left from a power supply. Everything else is a minor cause except for the tube design itself and the circuit placement/shi; /archives//html/Amps/2004-07/msg00226.html (10,598 bytes)
200. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 30 Jul 2004 08:32:40 +0100; Will Matney wrote: "I'd like to make a modest proposal here: how about not feeding a "dirty" supply to *either* of the grids?".......... Ian G3SEK Ian, that's exactly the point I'm trying to get acro; /archives//html/Amps/2004-07/msg00236.html (13,714 bytes)

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