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281. Re: [Amps] QRO is alive and well..in Greece (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 15 Nov 2010 06:42:18 -0800
Jim VE7RF _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-11/msg00244.html (9,249 bytes)

282. [Amps] Capacitor Values (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 16 Nov 2010 21:06:53 -0800
Well as luck has it just as I am putting together my tuned input my LCR meter went south ( my own fault for getting something cheap off Ebay ) I have some compression trimmers I am trying to find val
/archives//html/Amps/2010-11/msg00291.html (8,116 bytes)

283. [Amps] older 3k (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 17 Nov 2010 17:05:18 -0800
I HAVE THE OLDER 3K AND THE TUBES STOP LIGHTING UP. DOES ANYONE HAVE ANY IDEAS? THANKS, JIM ARNOLD DEBONAIR@CENTURYLINK.NET V @ 15V fil xfmr, instead of a 5 V @ 30A fil xfmr. IF one tube's fil goes o
/archives//html/Amps/2010-11/msg00323.html (7,993 bytes)

284. [Amps] re compability of 3cx1200Z7 in lieu of 3cx1200D7eimac (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 17 Nov 2010 17:29:59 -0800
Can one use an eimac 3cx1200Z7 tube in lieu of the 3cx1200D7 tube? I note that the Z7 series has a flange at the bottom of the ceramic portion so will that pose a problem for a swap? Also the grid pi
/archives//html/Amps/2010-11/msg00326.html (10,029 bytes)

285. [Amps] brass or BNP hardware (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 22 Nov 2010 05:23:14 -0800
In RF power amplifiers, HF to VHF range, I have used brass or nonmagnetic stainless steel hardware for years, after having been "Burned" by steel screws - pun intended. Several times in my career I h
/archives//html/Amps/2010-11/msg00379.html (10,871 bytes)

286. [Amps] 240 vac primary protection..again (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 25 Nov 2010 03:59:20 -0800
Carl mentioned about using .01 uf caps from each hot leg of the 120/240 line to chassis..and tingling. That scheme was used on my real old drakes..except that they only had a 2 x prong 120 vac plug !
/archives//html/Amps/2010-11/msg00434.html (9,416 bytes)

287. [Amps] Tube Cooling.. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 25 Nov 2010 20:47:15 -0800
ORIGINAL MESSAGE: REPLY: The trouble with that approach is you have hot air blowing down over the tube seals and socket. Not good. Anodes by themselves are relatively unaffected to heat compared to t
/archives//html/Amps/2010-11/msg00464.html (9,428 bytes)

288. [Amps] MOVs (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 25 Nov 2010 21:53:51 -0800
A 130V MOV on the 120V AC line would get hot in a hurry 1,414 * 120 = 169.7V so the thing would be conducting a high percentage of the time. You'd want at least a 180V MOV. peak rating. MOV's are not
/archives//html/Amps/2010-11/msg00465.html (11,489 bytes)

289. [Amps] MOVs (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 26 Nov 2010 06:06:45 -0800
Some where around here I think I might still have one of those 50,000 joule MOVs and they are big. They are mounted on their own aluminum back plate. IIRC they are about 2.5 X 3.5 X about 1" thick. 7
/archives//html/Amps/2010-11/msg00481.html (8,656 bytes)

290. [Amps] A dual 4-1000 amp (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 26 Nov 2010 06:20:25 -0800
If you want that Mig-21 sucking up gravel on an unimproved runway sound, go with a couple of Rotron Centrimax CX-33 blowers. Or, if the XYL doesn't mind a little two-cycle smoke, use a 41cc Homelite
/archives//html/Amps/2010-11/msg00482.html (8,535 bytes)

291. [Amps] A dual 4-1000 amp (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 27 Nov 2010 01:42:33 -0800
I've got a wild hair up my derriere about building something. A project. I got two spools of soldier over here and a darned good soldiering station. It's about darned time I used it. 'american beauty
/archives//html/Amps/2010-11/msg00509.html (12,060 bytes)

292. [Amps] Fan for SB220 (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 19 Dec 2010 01:39:05 -0800
Paint the inside and outside black. The black inside will absorb the heat more effectively and the black outside will radiate it more effectively. Bob K8MLM outside of the cabinets.... FLAT BLACK ! H
/archives//html/Amps/2010-12/msg00240.html (8,643 bytes)

293. [Amps] Don't do this (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 19 Dec 2010 06:22:39 -0800
REPLY: Just a word of advice - back to back diodes across the meters adds zero protection. Diodes don't conduct until the voltage across them reaches about .6 volts and by then the meters will be toa
/archives//html/Amps/2010-12/msg00243.html (10,024 bytes)

294. [Amps] wires through center of coax (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 20 Dec 2010 08:04:12 -0800
Bill - WA4LAV I hope that running wires through coax center conductor like this won't cause problems because I am doing it with the 9 3/16 inch diameter output feeder of a new amplifier I have been w
/archives//html/Amps/2010-12/msg00285.html (9,137 bytes)

295. [Amps] TenTec Centurion - 422 tuning question (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 24 Dec 2010 06:17:52 -0800
This seems to be the way Ten Tec power amps are set up. My Titans, vintage 1980, are also set up that way. So take the cover off and look at it! That's what I did. End of confusion. :) It's also quit
/archives//html/Amps/2010-12/msg00334.html (10,539 bytes)

296. [Amps] AL-1500 Plate Meter Circuit (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 24 Dec 2010 06:42:22 -0800
The diode in this amp on the filter cap board shorted. That caused the grid and plate current meters to read the same. Just the plate current divided on the two meters. Jim W7RY sez in their manual t
/archives//html/Amps/2010-12/msg00337.html (9,677 bytes)

297. [Amps] 572B AMP PLANS (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 26 Dec 2010 23:29:58 -0800
Hsu, The 813 looks nice. But I am very impressed with the GI7B. I really work that tube hard - both in the RTTY contesting and on the bench (one time, I ran the pair for 20 minutes key down at rated
/archives//html/Amps/2010-12/msg00390.html (10,671 bytes)

298. [Amps] Fuses (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 7 Jan 2011 07:13:48 -0800
You can also get some values of 250v ceramic fuses at Home Depot, etc. They are used in microwave ovens. I agree that slow blows are not likely to be correct for an amplifier -- they are very slow an
/archives//html/Amps/2011-01/msg00060.html (8,604 bytes)

299. [Amps] Fuses (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 7 Jan 2011 16:02:43 -0800
Just dont over fuse. The usual 1200W out amp uses 10-12A; 15A for 1500-2200W, etc at 240VAC. Carl KM1H breaker ?? Ideally, a 2 x pole, 15A , controlled magnetic hydraulic breaker would be the 1st cho
/archives//html/Amps/2011-01/msg00069.html (8,869 bytes)

300. [Amps] Fuses (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 8 Jan 2011 02:18:50 -0800
A fuse provides NO current limiting until it blows; and a breaker provides NO current limiting until it breaks. A lot of damage can be done in those first few milliseconds, which is why the fuse/brea
/archives//html/Amps/2011-01/msg00081.html (11,324 bytes)

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