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361. [Amps] RF in the Audio (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 25 Sep 2011 20:47:17 -0700
The last place I would insert a balun is at any point in a OWL fed antenna. Do the twists as have been the norm since the 30's and live with whatever unbalance remains. reason, same deal. Since OWL t
/archives//html/Amps/2011-09/msg00218.html (14,218 bytes)

362. [Amps] What type of amplifier is best (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 13 Nov 2011 14:23:28 -0800
Hello all. I know I am revealing my ignorance, as most of what is on this list goes above my head. However, I am looking to buy an amplifier, full legal limit (1500 W -- US or more wattage -- I mean
/archives//html/Amps/2011-11/msg00056.html (8,812 bytes)

363. [Amps] Arcing 8877 (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 25 Nov 2011 21:45:21 -0800
Hi All, I have a 2nd hand 8877 based 144 Mhz amp, built like a rock. Has worked fine for over a year, then bang. I saw a flash and of course the fuse did its job. The tube in it was maybe 20 years ol
/archives//html/Amps/2011-11/msg00141.html (8,804 bytes)

364. [Amps] HIGHWAY LOUIE (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 26 Nov 2011 00:12:27 -0800
I remember the guy who had the Cadillac with a complete S-line including the 30S1 in it. I think it may have even made QST. (50's or 60's) I'm sure he's not the only one to run QRO mobile. When it co
/archives//html/Amps/2011-11/msg00142.html (8,679 bytes)

365. [Amps] 3cx3000a7 HV (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 26 Nov 2011 00:32:21 -0800
Hello, does anybody know would it 3cx3000a7 work at 3500V for plate (under load) in order to use air capacitors in PI tank? Goal is solid 1500w out with 100w drive. Thanks, Danny E73M out with just 5
/archives//html/Amps/2011-11/msg00144.html (8,563 bytes)

366. [Amps] On Behalf of K4BOF (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 26 Nov 2011 23:54:04 -0800
Yes, that is exactly the way to do it! :-) I also highly recommend grounding all of the grids directly, as W8JI suggests. I've been using a modified 922 for a few months now and am very happy with th
/archives//html/Amps/2011-11/msg00149.html (10,076 bytes)

367. [Amps] mallory caps for HV supply. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 27 Nov 2011 00:26:58 -0800
The 1N5408 negative rail clamp is a good idea but JI vehemently opposed that idea every time I suggested it and claims the 1N4007 is better. Unfortunately Ive had his "expertly designed" amps in here
/archives//html/Amps/2011-11/msg00151.html (10,803 bytes)

368. [Amps] best deal for Mallory caps? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 27 Nov 2011 18:05:36 -0800
Another important point. It's rare for all of the caps in the series string to fail. Only one gone bad will cause lots of hum. I use my trusty Simpson 260 on the middle Ohms range to read charge and
/archives//html/Amps/2011-11/msg00152.html (8,362 bytes)

369. [Amps] On Behalf of K4BOF (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 28 Nov 2011 07:24:25 -0800
No more ** That's no different than using diodes with no big electrolytic.....same result...the bias wanders a bit but really hurts nothing. Carl through em on idle] This will rise by 12% when 1.5A f
/archives//html/Amps/2011-11/msg00159.html (9,588 bytes)

370. [Amps] Can distilled water be used for a dummy load ?? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 29 Nov 2011 06:05:34 -0800
My hb 50 ohm dummy load consists of 4 x 200 ohm globars in parallel [type SP, glass bodied and suitable for oil immersion]. Each resistor is 1" diam x 12" long. [275 W CCS in air] Each resistor resid
/archives//html/Amps/2011-11/msg00164.html (8,139 bytes)

371. [Amps] Distilled water in dummy load (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 1 Dec 2011 01:34:04 -0800
Jim and all, I've spent a lot of time for the past two years with high power liquid-cooled loads. The globar resistor assembly sounds neat. The popular high power resistor loads that have water hose
/archives//html/Amps/2011-12/msg00012.html (11,433 bytes)

372. [Amps] best deal for Mallory caps? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 2 Dec 2011 22:03:56 -0800
Ummm, an open lytic is not going to show ANY charging on the meter. I stand by my earlier statement that a 260 is otherwise 99% useless to find high levels of leakage that will indicate a problem in
/archives//html/Amps/2011-12/msg00020.html (10,987 bytes)

373. [Amps] Can distilled water be used for a dummy load ?? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 4 Dec 2011 05:09:33 -0800
Glycol is not a requirement with the Altronic Omegaline. It works with running tap water from a common faucet to a drain or sink. It's that simple. Paul, W9AC closed loop setups, they will use a 1500
/archives//html/Amps/2011-12/msg00026.html (11,544 bytes)

374. [Amps] 2 x 3-500Z filament choke + 30/60/80A fil chokes (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 4 Dec 2011 06:47:19 -0800
Hi All I am gathering the parts to build a two valve 3-500Z linear amp. All the suggestions for the filament choke seem to be to purchase from RF parts or surplus sales in the USA. I haven't been abl
/archives//html/Amps/2011-12/msg00027.html (12,666 bytes)

375. [Amps] Sucking air/AL-1500 cooling. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 4 Dec 2011 05:50:52 -0800
I think the default tap is the lowest setting, for 1.5 kw ssb use. There is no switch for the various blower speed settings, they are hardwired on a terminal strip somewhere. Just change the tap to a
/archives//html/Amps/2011-12/msg00028.html (7,493 bytes)

376. [Amps] re eimac 3cx1200 tube (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 4 Dec 2011 17:49:23 -0800
Can the eimac 3CX1200Z7 tube but used in lieu of the 3CX1200D7 tube in an hf amplifier without any modifications? I know that the filament voltages are the same and use the same tube socket, Looking
/archives//html/Amps/2011-12/msg00034.html (7,445 bytes)

377. Re: [Amps] 2 x 3-500Z filament choke + 30/60/80A fil chokes (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 5 Dec 2011 01:19:54 -0800
has a mu of 600. Type 43 has a mu of 800. I had zero access to type 33 material in rod form. What you don't want is type 61, with it's mu=125. It won't provide enough uh on the low bands at all. If t
/archives//html/Amps/2011-12/msg00038.html (9,733 bytes)

378. [Amps] 2 x 3-500Z filament choke + 30/60/80A fil chokes (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 7 Dec 2011 00:37:01 -0800
** I dont know where you are getting 43 mix rods Jim since Fair-Rite doesnt make them. The 33 mix is the choice plus it is temperature stable to a high degree. bottom. Dunno where sson gets em from.
/archives//html/Amps/2011-12/msg00058.html (9,424 bytes)

379. [Amps] Replacing 3-500Z tubes with 4-400A tubes (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 7 Dec 2011 21:18:54 -0800
I have several very good 4-400 A tubes and have replaced a pair of bad 3-500Z tubes with a pair of 4-400A tubes in a Heath SB 220 amp. I have noticed much lower resting current being drawn when keyed
/archives//html/Amps/2011-12/msg00068.html (9,481 bytes)

380. [Amps] rectifier diode modules (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 7 Dec 2011 21:40:50 -0800
I'm looking for suggestions for a source of diode blocks to use in a couple of HV power supplies. I'm using a bridge rectifier and would like to have 8KV-10KV PRV per block. The power supply will be
/archives//html/Amps/2011-12/msg00070.html (8,307 bytes)

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