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361. Re: [Amps] Mica cap substitute \ alternative (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Wed, 12 Jul 2006 17:28:22 -0400
Steatite, (porcelain); Corning Glass, PTFE.... --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On Behalf Of Gary Smith Sent: Wednesday, July 12, 2006 5:18
/archives//html/Amps/2006-07/msg00352.html (10,302 bytes)

362. Re: [Amps] Switching Power Supplies (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Sun, 16 Jul 2006 12:02:48 -0400
Dear Steve, You raise a very good point in your question about what happens to a switching P/S in an arc situation. In a Class A power supply (ferroresonant, etc., ) there's a chance the filter cap(s
/archives//html/Amps/2006-07/msg00449.html (11,281 bytes)

363. Re: [Amps] RF Chokes (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Mon, 17 Jul 2006 10:36:31 -0400
In the Alpha 77Sx retrofit my RFC started out at about 200uH with 18AWG on a 12" Teflon 1.25" diameter form, bypassed at the cold end with 1,000pF at 90KVaR. Two chokes needed to be added: One, a "VH
/archives//html/Amps/2006-07/msg00516.html (10,309 bytes)

364. Re: [Amps] RF Chokes (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Tue, 18 Jul 2006 15:50:47 -0400
Despite all the talk about how good the RF Parts plate choke is, and how it works on all bands, the current-handling feature is still a hurdle. For now, forgetting about the 1.5 ampere rating, do not
/archives//html/Amps/2006-07/msg00588.html (8,165 bytes)

365. Re: [Amps] RF Chokes (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Wed, 19 Jul 2006 09:31:48 -0400
Yesterday, W1ITT mentioned his chokes are hollow Teflon, filled with a "particular" ferrite filling. I wonder if the use of the word "particular" refers to the meaning "particle-matter," or " a speci
/archives//html/Amps/2006-07/msg00621.html (10,873 bytes)

366. Re: [Amps] AMPS (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Thu, 20 Jul 2006 07:42:06 -0400
The GM3SEK and WD7S Triode and Tetrode Controller boards, when suitably integrated, when properly adjusted, serve to protect tubes and power supplies in a much faster time frame than fuses. Incorpora
/archives//html/Amps/2006-07/msg00662.html (7,787 bytes)

367. [Amps] German HF/VHF rig (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Sat, 22 Jul 2006 09:06:20 -0400
1. The Blue powder coating and rubber bat-wing handles will certainly appeal to the fashionable crowd. 2. The rig gets a PS-2 keyboard plugged into the apron. 3. It has a CAT jack, too. 4. The inside
/archives//html/Amps/2006-07/msg00848.html (8,843 bytes)

368. Re: [Amps] 3cx3000A7 driver (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Sat, 22 Jul 2006 09:12:13 -0400
Pete, This radio is built for the future. In tomorrow's world -160dB(c) per cycle may actually be a force to contend with...... [snip] I'd love to know why they think a +40dBm third order intercept i
/archives//html/Amps/2006-07/msg00849.html (8,646 bytes)

369. Re: [Amps] Before I turn on my amplifier . . . . . . (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Sat, 22 Jul 2006 09:21:08 -0400
Dear Dan, It might be wise to find out if there is a breakdown both in the power supply section and in the RF deck before powering up with tubes and drive. Yank the tubes and disconnect the sections
/archives//html/Amps/2006-07/msg00850.html (8,464 bytes)

370. Re: [Amps] Tube Prices (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Sun, 30 Jul 2006 13:39:29 -0400
Richardson's doesn't even have the temerity to list tube prices any more. Last year I checked on a 3CPX1,500A7 and they wanted $3,495.00 per piece. Even C & D in Florida seems to off the Eimac list a
/archives//html/Amps/2006-07/msg01393.html (9,841 bytes)

371. Re: [Amps] Hercules II power supply (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Thu, 3 Aug 2006 16:29:51 -0400
Vic, Is your power plant an RS70 BB? This is the kind that can float a battery charge and not end up with a thermal runaway. Hal Mandel W4HBM Well, from my point of view the only good battery is one
/archives//html/Amps/2006-08/msg00106.html (8,898 bytes)

372. Re: [Amps] Hercules II power supply (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Thu, 3 Aug 2006 17:10:24 -0400
The Astron line has a suffix on their part numbers, "BB," which refers to Battery Backup. The battery backup feature allows the user to attach a flooded or VRLA (gel) cell to the output and while the
/archives//html/Amps/2006-08/msg00108.html (9,144 bytes)

373. Re: [Amps] off topic---how do I unsubscribe? (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Fri, 4 Aug 2006 15:35:15 -0400
Dear Bill, This was the absolute best piece of humor EVER on the amps reflector. Bravo! Hal Mandel W4HBM --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
/archives//html/Amps/2006-08/msg00149.html (7,502 bytes)

374. [Amps] FW: RSOE (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Wed, 9 Aug 2006 06:29:22 -0400
Dear Fellow Ampers, The URL below is a comprehensive display of natural and man-made disaster elements affecting people all over the world. Data collecting and monitoring : National Association of Ra
/archives//html/Amps/2006-08/msg00328.html (6,453 bytes)

375. Re: [Amps] Anodizing aluminum, painting etc. (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Mon, 14 Aug 2006 13:38:07 -0400
Does the word "sink" in "heat sink" refer to the ability of a device that is cooler than something else, and its ability to use thermodynamics to use that temperature difference to draw heat from the
/archives//html/Amps/2006-08/msg00479.html (9,561 bytes)

376. Re: [Amps] Anodizing aluminum, painting etc. (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Mon, 14 Aug 2006 13:49:33 -0400
It's like the ringing of a bell, Steve. Except that primary parasitic oscillation didn't have a fundamental...... It might have been the result of a negative wavelength, in itself a result of a negat
/archives//html/Amps/2006-08/msg00480.html (8,001 bytes)

377. Re: [Amps] Anodizing aluminum, painting etc. (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Thu, 17 Aug 2006 11:29:28 -0400
This discussion has raised an issue, and I would appreciate some commentary. When the astronauts landed on the moon in the Apollo Program their vacuum suits contained air conditioners to cool them do
/archives//html/Amps/2006-08/msg00527.html (9,639 bytes)

378. [Amps] Soviet Tube Sockets (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Tue, 22 Aug 2006 10:49:24 -0400
The most interesting feature of the Emtron series of Tetrode amplifiers was their using GU-78b devices. This tube, corresponding to a 4CX3,000A, is available here and there still. The only problem is
/archives//html/Amps/2006-08/msg00593.html (7,646 bytes)

379. [Amps] Parasitics & Filament Sag (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Sat, 26 Aug 2006 15:00:27 -0400
Gentlemen, A previous post mentions a phenomenon wherein is written "parasitic oscillation" and what I deduce as filament sag. Is it possible that these two conditions are related? It is understood h
/archives//html/Amps/2006-08/msg00678.html (8,530 bytes)

380. [Amps] Parasitics & Filament Sag (score: 1)
Author: "Harold Mandel" <ka1xo@juno.com>
Date: Sun, 27 Aug 2006 12:47:45 -0400
Here is what I understand from the consensus of opinion: 1. VHF Parasitics may develop sufficient amperage such that filaments may physically distort. 2. Some sort of oscillation can happen as a resu
/archives//html/Amps/2006-08/msg00704.html (7,475 bytes)

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