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181. [Amps] VO Stokes book.. last call ! (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 3 May 2010 01:51:25 -0700
I'm compiling a list for the next mass e-mailing of stokes infamous book. It consist of 2 x PDF's... EACH is aprx 6 meg. Book is split into 2 x halves. I send stokes-1 on monday eve.....PST..... then
/archives//html/Amps/2010-05/msg00022.html (7,090 bytes)

182. [Amps] 1306 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 4 May 2010 04:34:16 -0700
Think I got my SK1306 for the YC156/YC179, from CTR Surplus a year or so ago. Dunno if it was a one off. They could be worth a try 73, Alek VK6APK 4CX-5000, etc. and Richardson's also has em.... surp
/archives//html/Amps/2010-05/msg00048.html (7,504 bytes)

183. [Amps] Importation of Used Tubes, or more generally radio (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 4 May 2010 04:48:34 -0700
Well, you can't insure them for a start because that will give away the value of them. On the customs declaration, just describe them as a gift. Value nil. Ornamental purposes only. 73, Alek. say the
/archives//html/Amps/2010-05/msg00051.html (8,527 bytes)

184. [Amps] Emtron (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 4 May 2010 04:51:53 -0700
They charged me $198 USD duty on a NEW AMP which is supposed to be duty free. Unfortunately I can't see any recourse for getting the money back. 73 Roger (K8RI) did you buy? Have you fired it up yet
/archives//html/Amps/2010-05/msg00052.html (6,807 bytes)

185. [Amps] alden 8101 hv connector's. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 31 May 2010 06:09:28 -0700
Here's a quote from the above website: "WARNING: These connectors should NEVER be handled, mated or unmated when voltage is applied" This is a good idea for any HV connector, but be aware that there
/archives//html/Amps/2010-06/msg00011.html (9,299 bytes)

186. [Amps] Collins Radio. Fundamentals of SSB now posted. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 31 May 2010 06:20:49 -0700
I posted most of the infamous Collins radio 'Fundamentals of SSB' on the yahoo amp grp..under files. Superb reading. CH-11 is not there though. It's HF propagation, and the file is huge. It can't be
/archives//html/Amps/2010-06/msg00012.html (7,484 bytes)

187. [Amps] Bridging 120v loads across HV primary windings (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 1 Jun 2010 07:23:16 -0700
Several commercial amps place the fan, filament. and relay/bias supply across one winding with no apparent problem. It is amazing that millions of dryers had been built with the motor wired from one
/archives//html/Amps/2010-06/msg00017.html (8,784 bytes)

188. [Amps] Alpha 77DX (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 1 Jun 2010 07:28:07 -0700
Regarding my Alpha 77DX questions and issues: Regarding the oil filled capacitor, I tested the value prior to operational testing of the amplifier; the value is 25 microfarads as rated. After cleani
/archives//html/Amps/2010-06/msg00018.html (7,634 bytes)

189. [Amps] Bridging 120v loads across HV primary windings (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 4 Jun 2010 04:30:29 -0700
Vic, Run the 4 wire circuit and call it a day. ? ?I ran this very issue by a licensed master electrician on Friday. ? Direct quote: "If any portion of the load is 120 volt, you need a neutral. ?If y
/archives//html/Amps/2010-06/msg00049.html (9,078 bytes)

190. [Amps] backwards plate transformer (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 11 Jun 2010 03:43:26 -0700
I have used pole transformers since 1968, running them backwards so to speak as you have decided to do.? As long as you follow the proper voltage and current of the original transformer design, you w
/archives//html/Amps/2010-06/msg00120.html (9,518 bytes)

191. [Amps] 1N5408 vs 1N5553 (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 11 Jun 2010 03:55:11 -0700
and the 1N5408 is 5ua, both at 25*C. Leakage goes up with temperature. I was surprised to learn that the 1N5408 is made by at least 29 different manufacturers (http://www.datasheetcatalog.com/datashe
/archives//html/Amps/2010-06/msg00121.html (9,636 bytes)

192. [Amps] Peter Dahl / Harbach SB-220 transformer (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 11 Jun 2010 04:09:48 -0700
Directly grounding the grids increases the stage gain which may lead to instability on the highest bands. on SB-220's... that have been modified for 6m. [those are ones you modified for 6m] This also
/archives//html/Amps/2010-06/msg00122.html (9,334 bytes)

193. [Amps] Transformer Calcs (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 12 Jun 2010 01:22:49 -0700
For a KW level HV transformer, is there much difference between the temp that you can touch and measure, say at the outside laminations, and perhaps the more important temperatures in the core cente
/archives//html/Amps/2010-06/msg00144.html (10,995 bytes)

194. [Amps] Heat Measurement in Amps (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 12 Jun 2010 01:51:19 -0700
Has anyone found a decent cheap temperature sensor/guage (perhaps even at harbor freight, etc) that you could place at a specified location in the exhaust airstream of the tubes, of various amps to
/archives//html/Amps/2010-06/msg00145.html (10,761 bytes)

195. [Amps] Peter Dahl / Harbach SB-220 transformer (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 12 Jun 2010 02:06:56 -0700
good on SB-220's... that have been modified for 6m. I actually stopped directly grounding the grids on my 6 meter conversions to limit the power output (like a governor) once I was able to obtain 150
/archives//html/Amps/2010-06/msg00146.html (10,021 bytes)

196. [Amps] Peter Dahl / Harbach SB-220 transformer (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 13 Jun 2010 04:18:30 -0700
500w . He wiped out the neighbourhood CATV... and that amp was relegated to FD use. He also wiped out the 49.9 mhz cordless phone freqs at the time. This was 10 yrs ago. ** Well, if it only made 500
/archives//html/Amps/2010-06/msg00162.html (9,995 bytes)

197. [Amps] 1 db compression point procedure ? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 30 Jun 2010 05:40:20 -0700
Ok What's the exact procedure for finding the ..'1db compression point' on a HF amp ?? I have conflicting info on the procedure. With hardly any drive, the typ HF amp has a lot of gain. As drive leve
/archives//html/Amps/2010-06/msg00221.html (7,538 bytes)

198. [Amps] New High Efficiency 3-500Z plate caps (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 1 Jul 2010 23:50:38 -0700
You'll also notice the crayon is going DIRECTLY onto the anode "pin" the tube on the right. And on the TOP of the "new fangled" plate cap on the right. Not a very fair test. I would like to see the t
/archives//html/Amps/2010-07/msg00023.html (10,628 bytes)

199. [Amps] 2 x 4-1000 supressor. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 15 Jul 2010 17:46:21 -0700
= 16.67 ohms. KM1H is using a 68 ohm -50 w globar. Carl, are did u use a SINGLE 68 ohm resistor ?? consisted of 5 x 250 ohm resistor's in parallel [ 2 watt carbons] worked good too. , [ 2- 2.5 turns]
/archives//html/Amps/2010-07/msg00135.html (8,601 bytes)

200. [Amps] Size of Parasitic Chokes (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 16 Jul 2010 04:41:32 -0700
The tricky part is using enough inductor to be effective without having so much that the resistor overheats when operating on ten meters. A delicate balancing act, believe me. You can simplify the ba
/archives//html/Amps/2010-07/msg00156.html (12,451 bytes)

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