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Total 471 documents matching your query.

301. Re: [Amps] YC156 operating parms for US amp build? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 30 Mar 2010 07:28:30 +0100
[...] I know a guy who had the answer... or at least, an answer that worked for him. He watched the DXcluster from work, so he could time his lunch break to catch the mid-day openings on 6m. If he sa
/archives//html/Amps/2010-03/msg00848.html (7,673 bytes)

302. Re: [Amps] 3CX800 Amplifier Pictures (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 11 May 2010 08:13:28 +0100
Nice work, Jim - love it when a plan comes together! -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek/ _______________________________________________ Amps mailing list Amps@contesting.com http:/
/archives//html/Amps/2010-05/msg00135.html (8,351 bytes)

303. Re: [Amps] 4CX250B Ratings in Dentron Clipperton V (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 23 May 2010 09:10:19 +0100
At output levels of about 250W PEP per tube, the 4CX250B is capable of IMD3 figures around -35dB (referenced to PEP). It is Eimac's marketing claims, inciting users to drive the tubes to a much highe
/archives//html/Amps/2010-05/msg00317.html (10,234 bytes)

304. Re: [Amps] HV Connectors (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 24 May 2010 07:48:46 +0100
Yes, SHV - expensive for connectors, but cheap for life insurance. (Kings are one of several manufacturers. Mainline distributors such as Digi-Key and Mouser stock them at silly prices, but they ofte
/archives//html/Amps/2010-05/msg00373.html (8,076 bytes)

305. Re: [Amps] What do you think of these HV Connectors (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 30 May 2010 19:21:42 +0100
In talks on HV Power Supplies, I pass around a back-to-back MHV adapter with MHV plugged into one side, BNC into the other. Nothing beats hands-on learning. The only fool required was the one who des
/archives//html/Amps/2010-06/msg00001.html (8,415 bytes)

306. Re: [Amps] 50 watt stud mount zener diodes (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 12 Aug 2010 07:19:47 +0100
Some years back, I did comparative costing for the TL431/TIP147 active regulator circuit ("adjustable zener") versus the 50W stud zener. The parts for the active regulator cost less than $5 at UK 200
/archives//html/Amps/2010-08/msg00173.html (12,562 bytes)

307. Re: [Amps] Nice freebie (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 18 Aug 2010 07:54:40 +0100
In that case you're sure to hate NETCALC: http://www.ifwtech.co.uk/g3sek/netcalc/netcalc.htm NETCALC is a "Swiss Army Knife" calculator for (R +/-jX) impedance values. Like many other people back in
/archives//html/Amps/2010-08/msg00288.html (8,717 bytes)

308. [Amps] GU-81M data? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 18 Aug 2010 19:26:41 +0100
Does anyone have DC operating conditions for the Russian GU-81M pentode in class AB1 or AB2, please? The only data I can find are... http://www.kvindesland.no/yl2qm/tubes/gu81m.htm Vg2 = 600V, Vg1 =
/archives//html/Amps/2010-08/msg00301.html (7,143 bytes)

309. Re: [Amps] GS35B questions (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 10 Sep 2010 18:43:43 +0100
You're right! Try this: <http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#0901> and download the PowerPoint presentation. You have already identified that a remote HV power supply should be 'slaved
/archives//html/Amps/2010-09/msg00072.html (10,023 bytes)

310. Re: [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 11 Sep 2010 07:48:12 +0100
Same here, with no problems ever. You needn't feel uncomfortable about using RG59 if the published voltage rating is based on a test case that wouldn't apply to you. For example if the published rati
/archives//html/Amps/2010-09/msg00077.html (8,062 bytes)

311. Re: [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sat, 11 Sep 2010 13:15:22 +0100
I usually try for 'nothing at all': "Those aren't proper BNC connectors, you know." "Perfectly OK by me." "Here you are, then - take them away." "Thank you very much!" -- 73 from Ian GM3SEK http://ww
/archives//html/Amps/2010-09/msg00080.html (8,512 bytes)

312. Re: [Amps] Amps Digest, Vol 93, Issue 16 (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 12 Sep 2010 08:31:32 +0100
And if you ever forget to make that ground connection before you hot plug the single-wire HV connection, you'll have a lethal live chassis. We all make mistakes, but that particular one would be a pu
/archives//html/Amps/2010-09/msg00103.html (9,346 bytes)

313. Re: [Amps] Amps Digest, Vol 93, Issue 16 (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Sun, 12 Sep 2010 08:38:53 +0100
Sorry, I inserted "automatically" in the wrong place. That should have read: If you choose a coaxial HV connection, it automatically comes with its -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3se
/archives//html/Amps/2010-09/msg00104.html (7,867 bytes)

314. Re: [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 13 Sep 2010 18:47:33 +0100
Which only goes to show: never argue about safety with anyone who is willing to die for his beliefs! -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _____________________________________________
/archives//html/Amps/2010-09/msg00146.html (8,854 bytes)

315. Re: [Amps] Pulse tuning (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 24 Sep 2010 07:34:13 +0100
That wasn't one of my amp stories, Jim (but in future, it will be :-) -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@conte
/archives//html/Amps/2010-09/msg00300.html (8,551 bytes)

316. Re: [Amps] Any experiences with "powergridtube"? (YC156 hunt) (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Fri, 1 Oct 2010 08:52:18 +0100
There's one YC156 heater transformer that has its own IP address, so it can be activated 8 minutes before the owner arrives home. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek ________________
/archives//html/Amps/2010-10/msg00001.html (7,596 bytes)

317. Re: [Amps] TUNER (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Thu, 14 Oct 2010 12:14:20 +0100
This is surprising, because the reactance of the input capacitance can be cancelled without any switching, by "absorbing" it into a 1:1 pi network with C1 equal to the shunt capacitance of the tubes.
/archives//html/Amps/2010-10/msg00232.html (10,311 bytes)

318. Re: [Amps] diode junction temps and thermal resistance (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 20 Oct 2010 08:08:08 +0100
Actually you *can* know something about the arc. 1. The peak current. The main function of a surge limiting resistor in the B+ line is to limit the peak current to a known value, so that Ipk = Vb/R.
/archives//html/Amps/2010-10/msg00322.html (10,602 bytes)

319. Re: [Amps] construct ferrite "line isolator" (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Tue, 26 Oct 2010 18:20:21 +0100
They are actually quite easy to buy in the UK, Europe and many other countries. The real point is that when international shipping costs, taxes and other mark-ups have been added, Fair-Rite products
/archives//html/Amps/2010-10/msg00383.html (9,650 bytes)

320. Re: [Amps] construct ferrite "line isolator" (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Wed, 27 Oct 2010 07:25:20 +0100
PLEASE can we give this problem a new name! 'Pin 1' may mean something to pro audio people, but in amateur radio it's a bad name - meaningless, misleading and a barrier to communication. -- 73 from
/archives//html/Amps/2010-10/msg00399.html (9,183 bytes)

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