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221. Re: [Amps] [Moon-net] 4CX250B in P-P 2m? (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Fri, 31 Mar 2006 18:51:30 +0100; Yes, I know it would be *seriously* over-run. The maximum anode voltage is 2 kV and the maximum anode current per tube is 250 mW. So a pair of tubes should take no more than 1 kW of input power. So n; /archives//html/Amps/2006-03/msg00803.html (7,176 bytes)
222. [Amps] [Fwd: Re: [Moon-net] 4CX250B in P-P 2m?] (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sat, 01 Apr 2006 01:42:24 +0100; Oops, I mis-sent this. Forwarding on. Whilst 4CX250A/F are rated more than 4CX250Bs, they are probably less able to take serious abuse. They are not designed for class C, with a grid dissipation of 0; /archives//html/Amps/2006-03/msg00812.html (7,025 bytes)
223. Re: [Amps] 3CXC5000A7 (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 05 Apr 2006 08:55:19 +0100; Does such a tube as the 3CXC5000A7 exists? I know of the 3CX5000A7 and 3CPX5000A7 and you will find data sheets for both at www.g8wrb.org But no idea of a 3CXC5000A7 - the part number does not look r; /archives//html/Amps/2006-04/msg00075.html (7,530 bytes)
224. Re: [Amps] sealed air cooled dummy load in oil?? (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 05 Apr 2006 09:09:27 +0100; I agree with Steve - it depends a lot of the construction. It may make a lot of difference, or it may make very little. But you have an interesting point there about monitoring temperature. But one w; /archives//html/Amps/2006-04/msg00076.html (9,271 bytes)
225. Re: [Amps] tube 3CX5000A7 ( I sell them) (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 05 Apr 2006 09:21:37 +0100; The 3CX5000A7 is quite different from the YC156. The YC156 is identical (apart from some tests performed at Eimac) to the 3CPX5000A7, but the 3CPXC5000A7 & 3CXC5000A7 are quite different. Physically; /archives//html/Amps/2006-04/msg00077.html (8,015 bytes)
226. Re: [Amps] Paypal only (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Thu, 13 Apr 2006 09:06:03 +0100; Paypal is not safe as a seller. Do a bit of searching around the Internet with 'chargebacks' in the google search term. 1) Someone steals a credit card. 2) Pays for the goods on the stolen credit car; /archives//html/Amps/2006-04/msg00215.html (9,818 bytes)
227. Re: [Amps] dielectrics for PAs TSPA (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Fri, 14 Apr 2006 22:48:57 +0100; How do you fix it? PTFE is not something that is easy to glue. (That said, I'm pretty sure my old boss knows how to glue it, but I can't recall myself. I think you have to treat the surface first.) U; /archives//html/Amps/2006-04/msg00262.html (8,111 bytes)
228. Re: [Amps] Cal Lab (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 23 Apr 2006 16:58:29 +0100; Hi, I tried mailing you off-list, but the message bounced with : Remote host said: 550 Email from your Email Service Provider is currently blocked by Verizon Online's anti-spam system. So it seems yo; /archives//html/Amps/2006-04/msg00329.html (10,234 bytes)
229. Re: [Amps] Cal Lab (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Mon, 24 Apr 2006 22:56:34 +0100; I find it hard to belive Photoshop is the best package. As far as I know, and I may be wrong, Photoshop is not a vector drawing program. I used Coreldraw for meter scales which is a vector package. W; /archives//html/Amps/2006-04/msg00369.html (9,118 bytes)
230. [Amps] 3CX3000A1 - 3 kW or 4 kW anode dissipation? (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 07 May 2006 13:51:50 +0100; I've been given a complete 1967 Eimac data sheet on the Eimac 3CX3000A1, which I added to my web site at: http://www.g8wrb.org/data/Eimac/3CX3000A1.pdf It shows the anode dissipation as 3 kW max. Yet; /archives//html/Amps/2006-05/msg00026.html (7,418 bytes)
231. Re: [Amps] Need some help on a project (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 07 May 2006 16:38:48 +0100; I've had trouble emailing you before - your ISP does not like mine. The place to ask for this sort of thing is the time-nuts mailing list https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts There; /archives//html/Amps/2006-05/msg00028.html (7,475 bytes)
232. Re: [Amps] Need some help on a project (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Tue, 09 May 2006 01:16:05 +0100; But the difference is, generally the people here will not know anywhere near as much as those on time-nuts. I did not see your post - did it appear? I've doubt checked and don't see any with your nam; /archives//html/Amps/2006-05/msg00047.html (8,313 bytes)
233. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 17 May 2006 01:14:37 +0100; I believe your conclusions are invalid. I don't think so - see below. You need to keep them in the same ratio. So if I am not mistaken, your example keeps to 1000 W PEP by 1) Reducing the useful sign; /archives//html/Amps/2006-05/msg00162.html (10,966 bytes)
234. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 17 May 2006 07:06:45 +0100; But as you say, as soon as you add any IMD, to a signal, whilst keeping the signal level constant at 1000 W PEP, the PEP power will exceed 1000 W due to the distortion. Are you talking about an AM si; /archives//html/Amps/2006-05/msg00175.html (10,079 bytes)
235. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 17 May 2006 15:20:54 +0100; Yes, you are right. There are two simultaneous equations which would need to be solved to do it properly. This is reminding me a bit of one of the 'RMS power' arguments on Amps. I eventually solved t; /archives//html/Amps/2006-05/msg00184.html (12,478 bytes)
236. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Thu, 18 May 2006 02:17:54 +0100; <snip> I don't guarantee this is right, but here is my attempt at the maths of this. It looks reasonable, but I have not checked it carefully. Assume the amp has at the output two wanted signal volta; /archives//html/Amps/2006-05/msg00218.html (15,690 bytes)
237. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Thu, 18 May 2006 02:29:10 +0100; Sorry, I made a few errors. Here are some corrections. That should have been Pi, not Pu. That should have been IMD = 10 log_base_10(V1^2 / V3^2) Oops, another mess up, that should have been 20 log_ba; /archives//html/Amps/2006-05/msg00219.html (10,286 bytes)
238. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 28 May 2006 18:08:19 +0100; On way that is used to tell if people are lying about being deaf, is to get them to speak, and play their own voice back by a small delay. Hearings oneself after a short delay is very off putting. --; /archives//html/Amps/2006-05/msg00452.html (8,343 bytes)
239. Re: [Amps] Rich is a good guy (score: 1): Author: "David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 25 Jun 2006 11:06:44 +0100; The truth is 'amps' has been like this for as long as I can recall. I use a number of mailing lists and newsgroups, but the S/N on here is lower than any other. I don't know why, but IMHO it is a fa; /archives//html/Amps/2006-06/msg00366.html (8,156 bytes)
240. Re: [Amps] Rich is a good guy (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 25 Jun 2006 12:36:41 +0100; Here is the extract from the message I received on an interesting technical subject about VHF linear design. "I had thought of asking the question on the Amps forum but I am a bit put off by how aggr; /archives//html/Amps/2006-06/msg00367.html (8,010 bytes)

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