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221. [Amps] Can I cool too much the tubes or ants? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 23 Aug 2010 22:29:54 -0700
Unlikely it'd be the antenna heating, but OTOH the typical balun sold to hams is quite susceptible even at less than the legal limit. On low bands like 160 and 75 it's easy to fracture the ferrite in
/archives//html/Amps/2010-08/msg00357.html (11,000 bytes)

222. [Amps] triode or tetrode (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 27 Aug 2010 01:02:10 -0700
I am kicking around the idea of a new amp ( I want 160m capability which my current amp doesn't have) and have a few questions for the gurus and those that have theses beasts. Am I better off with a
/archives//html/Amps/2010-08/msg00400.html (10,458 bytes)

223. [Amps] GS35B questions (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 10 Sep 2010 04:28:11 -0700
Or, use two connectors, one for B plus and another for B minus. 73 de K5GW for 6M has a separate 4500vdc B+ supply. Separate B+ and B- connectors used between RF deck and power supply. are outstandin
/archives//html/Amps/2010-09/msg00063.html (9,183 bytes)

224. [Amps] GS35B questions (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 10 Sep 2010 04:53:17 -0700
Great idea.... I too am using 2 resistors for the HV return in my 8877 project. I wanted to have a resistor in the power supply as well as in the RF deck. I used a 2K in the power supply and a 2k in
/archives//html/Amps/2010-09/msg00065.html (9,433 bytes)

225. [Amps] Amp protection. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 10 Sep 2010 07:08:53 -0700
Good idea to use diodes instead of drop resistor Bill. Thank you for helping out! I would think that the diodes should be able to withstand very large surges, as you mention in case of a glitch. If t
/archives//html/Amps/2010-09/msg00068.html (8,021 bytes)

226. [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 11 Sep 2010 07:25:38 -0700
Dave and all, the last SHV connectors I purchased were from Pasterrnak, the high priced specialist folks. They have SHV cable and mating chassis connectors for RG213/U coax. II wanted the security of
/archives//html/Amps/2010-09/msg00084.html (10,267 bytes)

227. [Amps] HV wires, back-to-back diodes, and B- wiring (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 12 Sep 2010 05:35:52 -0700
I've been reading these posts with interest. Some of my practices are a bit different from those discussed here. (1) HV wiring: I use ordinary red-jacketed RG-58 cable with Kings HV BNC connectors to
/archives//html/Amps/2010-09/msg00119.html (16,113 bytes)

228. [Amps] RG-393 (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 12 Sep 2010 16:59:25 -0700
I have that cable in stock, guess abt 150ft. I'm located a little far away, Finland so you better get it from a US distributor. It's not cheap! gl, Alf OH2QM I just got a bunch of it from Steve Davis
/archives//html/Amps/2010-09/msg00133.html (6,982 bytes)

229. [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 14 Sep 2010 03:51:23 -0700
Exactly. I assume none of the people proposing using PL-259 plugs for HV are chartered engineers. The Engineering Council in the UK would I expect strip someone of their CEng status if an individual
/archives//html/Amps/2010-09/msg00162.html (13,095 bytes)

230. Re: [Amps] SHV connectors great, but where to find coax? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 15 Sep 2010 00:02:35 -0700
Hi Jim, I could not find any ratings for the P{asternak connectors. When I received them, I was a bit dubious of them handling enough voltage. The dielectric of the center conductor of the coax has t
/archives//html/Amps/2010-09/msg00181.html (13,295 bytes)

231. [Amps] pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 20 Sep 2010 02:27:31 -0700
With cw dots you are "pulse" tuning at 30% duty. Last time I checked, CW dits are one unit length duration, and the spaces between dits within a character are also one unit length. Most keyer's these
/archives//html/Amps/2010-09/msg00229.html (7,614 bytes)

232. [Amps] Pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 23 Sep 2010 06:34:17 -0700
Content-Type: text/plain; charset="us-ascii"; format=flowed Surely, with pulse tuning, you are getting the duty cycle as close as possible to ssb conditions. Therefore you are tuning your amplifier t
/archives//html/Amps/2010-09/msg00279.html (9,994 bytes)

233. [Amps] filament transformer (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 23 Sep 2010 07:21:05 -0700
I'm looking for a filament transformer for a 3cx3000 or 3cx6000..;My YC156 tube went south and I can't see paying $450 for a used tube when I can buy a new tube for just a little more..so if anyone n
/archives//html/Amps/2010-09/msg00280.html (11,960 bytes)

234. [Amps] Pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 23 Sep 2010 08:13:47 -0700
I use a piece of software called Test Tone Generator to pulse tune my amp. It is set for 200Hz for one pulse tone, and 600Hz for the other. I have the duty cycle for each tone set for 30%, which seem
/archives//html/Amps/2010-09/msg00282.html (8,956 bytes)

235. [Amps] Pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 23 Sep 2010 21:25:48 -0700
Agreed. If one needs pulse tuning not to blow up his amp, he undersized components. 73 Peter va xfmr. Tos in collins 30 l-1, sb-200, and old dentron amps[all of em] , yaesu FL-2100B, etc,.. and u soo
/archives//html/Amps/2010-09/msg00296.html (9,019 bytes)

236. [Amps] Pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 23 Sep 2010 21:55:01 -0700
No. Plate current will not be way higher and dissipation will not either. I tune for maximum out in the center of the band and don?t touch anything while moving around in a contest. Output power drop
/archives//html/Amps/2010-09/msg00297.html (10,470 bytes)

237. [Amps] Pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 23 Sep 2010 22:14:30 -0700
REPLY: No, you are missing my point. By tuning up at 100% and getting some voltage sag, when you go to a lower duty cycle like SSB you have less sag and more headroom. Thus less likely to splatter, a
/archives//html/Amps/2010-09/msg00298.html (9,094 bytes)

238. Re: [Amps] Pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 24 Sep 2010 02:02:23 -0700
centurion, with the 2 x 3-500Z's has a 3.5 kva CCS xfmr, then further blathers on abt '7 kw IVS' which is a throw back to orr's books. [ Int Voice Service]. Fact is the centurion is capable of 1300w
/archives//html/Amps/2010-09/msg00302.html (9,939 bytes)

239. [Amps] Pulse tuning (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 24 Sep 2010 15:46:17 -0700
The fallacy of the whole "pulse tuning" theory is that most amateurs are looking at an analog meter ( averaging ) when they should be looking at an oscilloscope ( peak-reading ) and tuning for the mo
/archives//html/Amps/2010-09/msg00312.html (9,119 bytes)

240. [Amps] Why are 833s so Expensive (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 28 Sep 2010 03:33:00 -0700
Hi Roger, Perhaps because they are used here: http://www.wavac-audio.jp/sh833_e.shtml which retails for $175,000 73 & Good morning, Marv WC6W http://qsl.net/wc6w/ http://www.covenantaudio.com/product
/archives//html/Amps/2010-09/msg00340.html (8,864 bytes)

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