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Total 573 documents matching your query.

381. Re: [Amps] SB-220 Re-Build (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Mon, 13 May 2019 06:45:49 -0500
What is a useful bias? You have lowered the Q of the tank circuit by raising the plate voltage 500 volts which makes it more efficient, but lowers the harmonic suppression. What power output level we
/archives//html/Amps/2019-05/msg00041.html (13,531 bytes)

382. [Amps] Fwd: Re: SB-220 Bias Issue, Too High of Plate Voltage? (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Mon, 20 May 2019 08:05:42 -0500
MOST of the Harbach stuff is safe, but costs at least twice what it should. Stay away from the Nichrome parasitic suppressors (too much L, that makes 'em run WAY hot on 28 MHz). Rebuild your using Gl
/archives//html/Amps/2019-05/msg00056.html (13,658 bytes)

383. Re: [Amps] Measuring IMD in a home workshop (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Wed, 29 May 2019 12:36:27 -0500
Wasn't I just saying something about this? That is was junk? *Problem Equipment* K2Phase Noise No cure don't run high power FT1000MPKlix Well known mods can fix Icomsleading edge spike Bucket Techniq
/archives//html/Amps/2019-05/msg00075.html (10,094 bytes)

384. Re: [Amps] 3cx800a7 chimeny (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Mon, 17 Jun 2019 18:03:01 -0500
Ebay? Thanks 73 Jim W7RY Thanks, Ted K8AQM -- This email has been checked for viruses by AVG. https://www.avg.com _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2019-06/msg00047.html (7,710 bytes)

385. [Amps] Kenwood TL-922 Meter Needed (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Wed, 26 Jun 2019 16:37:49 -0500
Hey group! I'm installing a W7RY QSK into a friends TL-922 and the plate meter is bad. Anyone have one laying around they want to sell? Let me know. Thanks! -- Thanks 73 Jim W7RY ____________________
/archives//html/Amps/2019-06/msg00065.html (6,789 bytes)

386. Re: [Amps] Henry 2K desktop amp (score: 1)
Author: Jim W7RY <jimw7ry@gmail.com>
Date: Sat, 29 Jun 2019 21:22:35 -0500
Nope. The filaments are in series. Hard for one tube to be bad. 73 Jim w7ry Sent from my wireless communicator _______________________________________________ Amps mailing list Amps@contesting.com ht
/archives//html/Amps/2019-06/msg00084.html (8,684 bytes)

387. Re: [Amps] Henry 2K desktop amp (score: 1)
Author: Jim W7RY <jimw7ry@gmail.com>
Date: Sat, 29 Jun 2019 21:23:32 -0500
Exactly what 2k is it? Sent from my wireless communicator _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2019-06/msg00086.html (8,585 bytes)

388. Re: [Amps] Modern rig amplifier keying (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Sun, 21 Jul 2019 06:59:42 -0500
That should be fine. Thanks 73 Jim W7RY 73 Stan KM4HQE _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ________
/archives//html/Amps/2019-07/msg00019.html (7,643 bytes)

389. [Amps] Dead? (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Sat, 7 Sep 2019 21:31:08 -0500
Is this reflector dead? No post for a month! amps@groups.io is alive and well. -- Thanks 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2019-09/msg00001.html (6,131 bytes)

390. Re: [Amps] Henry 3K-A choke failure...workaround? (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Fri, 27 Sep 2019 17:00:47 -0500
Can you please draw me a diagram of the*plate choke *in the ground lead please? Thanks 73 Jim W7RY Hello wise ones... Bought a nice 3K-A at a flea market and made one SSB contact.  On the second cont
/archives//html/Amps/2019-09/msg00078.html (9,775 bytes)

391. Re: [Amps] Henry 3K-A choke failure...workaround? (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Fri, 27 Sep 2019 17:02:45 -0500
Unless you mean the plate supply filter choke?  Not the plate choke that connects to the tops of the tubes? Thanks 73 Jim W7RY On 9/27/2019 5:00 PM, Jim wrote: Can you please draw me a diagram of the
/archives//html/Amps/2019-09/msg00079.html (10,214 bytes)

392. Re: [Amps] Cathode Choke (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Fri, 4 Oct 2019 16:33:17 -0500
Is this a B&W or Viewstar PT3500? Is so, W8JI was not the designer. Thanks 73 Jim W7RY On 10/3/2019 2:47 PM, Roger Parsons via Amps wrote: I am attempting to repair a PT3000 amplifier for a friend. (
/archives//html/Amps/2019-10/msg00004.html (8,164 bytes)

393. Re: [Amps] Cathode Choke (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Fri, 4 Oct 2019 20:10:24 -0500
Sorry... Meant to say PT3000 amplifier. Fern, VE7GZ has or had a couple of the Viewstar (which is as I remember, the only company that built them, in very limited quantities). I believe Fern has all
/archives//html/Amps/2019-10/msg00006.html (9,614 bytes)

394. Re: [Amps] Cathode Choke (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Fri, 4 Oct 2019 20:10:41 -0500
Sorry... Meant to say PT3000 amplifier. Fern, VE7GZ has or had a couple of the Viewstar (which is as I remember, the only company that built them, in very limited quantities). I believe Fern has all
/archives//html/Amps/2019-10/msg00007.html (9,434 bytes)

395. Re: [Amps] Cathode Choke (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Sat, 5 Oct 2019 22:51:45 -0500
Spark gaps on the filament and cathode to ground also work well. Something rated to conduct at 50 volts will do the trick. Thanks 73 Jim W7RY On 10/5/2019 6:34 PM, Gary Schafer wrote: The choke in th
/archives//html/Amps/2019-10/msg00014.html (11,979 bytes)

396. Re: [Amps] Tips For Winding a Plate Choke (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Sat, 5 Oct 2019 22:52:55 -0500
Save yourself some headaches, and buy an Ameritron choke from MFJ. They work very well. They are about $30.00 or 35.00. Thanks 73 Jim W7RY Canada; the ship of fools where corruption and politics are
/archives//html/Amps/2019-10/msg00015.html (7,482 bytes)

397. Re: [Amps] Tips For Winding a Plate Choke (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Thu, 10 Oct 2019 07:27:17 -0500
We can't run more than 100 watts on 10 MHz in the USA. So no need to have it work there. Thanks 73 Jim W7RY Did you notice any effect on 10MHz. When I put an Ameritron choke in my 78, which I agree f
/archives//html/Amps/2019-10/msg00039.html (13,614 bytes)

398. Re: [Amps] Tips For Winding a Plate Choke (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Thu, 10 Oct 2019 07:28:42 -0500
It is the same choke at RF parts RFC-3.  Never had an issue on 160 on RTTY at 1500 watts output. Thanks 73 Jim W7RY On 10/10/2019 6:09 AM, Rob Atkinson wrote: Where and how a plate choke is mounted m
/archives//html/Amps/2019-10/msg00040.html (9,097 bytes)

399. Re: [Amps] SB-220 HV Transformer Wanted (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Wed, 30 Oct 2019 20:00:41 -0500
And it only produces 2240 volts DC. A bit low for an SB220.... Thanks 73 Jim W7RY Unfortunately, this transformer lacks the primary taps for CW/SSB operation of the OEM device. 73,    ... Joe, W4TV O
/archives//html/Amps/2019-10/msg00103.html (9,163 bytes)

400. Re: [Amps] SB-220 HV Transformer Wanted (score: 1)
Author: Jim <jimw7ry@gmail.com>
Date: Wed, 30 Oct 2019 21:33:43 -0500
But you didn't say that ever.... Thanks 73 Jim W7RY Just right for that tube. 73, Dick, W1KSZ And it only produces 2240 volts DC. A bit low for an SB220.... Thanks 73 Jim W7RY On 10/30/2019 1:38 PM,
/archives//html/Amps/2019-10/msg00106.html (11,182 bytes)

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