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Total 415 documents matching your query.

201. Re: [Amps] SB220 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 05 Nov 2003 06:40:31 -0500
Mike Hyder's comments are very thorough and right on. I would just add four points: -- The Harbach parasitic supressor mods are based on Rich Measures' work. I took them out of my amplifier years ago
/archives//html/Amps/2003-11/msg00054.html (9,494 bytes)

202. Re: [Amps] SB220 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 05 Nov 2003 06:49:42 -0500
At 09:00 AM 11/4/03 -0800, rlm < > wrote: ** The SB-220 has a current-limiting type filament transformer which limits inrush-I to 60% of what Eimac allows. However, a stepstart is still needed becaus
/archives//html/Amps/2003-11/msg00055.html (8,709 bytes)

203. Re: [Amps] SB220 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 05 Nov 2003 08:15:14 -0500
At 04:57 AM 11/5/03 -0800, R.Measures wrote: ** "This ship is unsinkable". "This amplifier is unconditionally stable". -- Wait 'till Pete installs a new pair of tubes. Been there, done that, NOS Eima
/archives//html/Amps/2003-11/msg00056.html (8,640 bytes)

204. Re: [Amps] Maximum tolerable SWR for dual 3-500Z amps (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 21 Nov 2003 07:46:20 -0500
At 07:05 AM 11/20/03 -0800, Joe Isabella wrote: I've done it with coax, so I know it works -- just not the best solution. One last thing, you want to start on the high end of your loading C -- if you
/archives//html/Amps/2003-11/msg00304.html (8,576 bytes)

205. Re: [Amps] 3-500Z plate durability (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Thu, 11 Dec 2003 09:00:10 -0500
At 06:32 AM 12/10/03 -0800, Joe Isabella wrote: In my amp, when I transmit (espeically in the typical long-winded 350W carrier AM transmission), my RF Parts 3-500ZGs get quite red (almost orange). Af
/archives//html/Amps/2003-12/msg00176.html (9,249 bytes)

206. Re: [Amps] Vacuum relays in Dentron MLA-2500 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 26 Dec 2003 17:11:12 -0500
At 04:52 PM 12/27/03 -0500, David A. Pruett wrote: However, if you put vacuum relays in, I'll bet the 4PDT will become the next level of annoyance. Most vacuum relays used by hams are 26 VDC. All of
/archives//html/Amps/2003-12/msg00401.html (9,403 bytes)

207. Re: [Amps] Vacuum relays in Dentron MLA-2500 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 26 Dec 2003 21:50:18 -0500
At 02:28 PM 12/26/03 -0800, Vic Rosenthal wrote: See <http://www.somis.org/QSK922.html>, Rich Measures' article on vacuum relay QSK. He uses a reed relay for the input and an RJ1A or HC-1 vacuum rela
/archives//html/Amps/2003-12/msg00406.html (8,872 bytes)

208. Re: [Amps] A Crying Shame (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Thu, 29 Jan 2004 09:56:36 -0500
At 07:17 AM 1/29/04 +0000, ka1xo@juno.com wrote: I wonder how many times the bozos in UPS tried dropping it to hear the tinkle inside? Sonsabitches! Well. That feels better. Hope you all have a real
/archives//html/Amps/2004-01/msg00341.html (8,015 bytes)

209. [Amps] SB-220 metering (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 30 Jan 2004 14:11:11 -0500
My old faithful SB-220 has been (and continues to be ) running just fine. Today, however, I noticed that the plate meter was sitting about 40 ma above the 0 line. It seems to be a mechanical change,
/archives//html/Amps/2004-01/msg00361.html (7,913 bytes)

210. Re: [Amps] SB-220 metering (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sat, 31 Jan 2004 14:24:35 -0500
At 02:02 PM 1/31/04 -0500, Gary Schafer wrote: Static on the plastic meter face? This appears to have been the problem. I think I *once* knew about this, but had forgotten. Thanks, everyone. 73, Pete
/archives//html/Amps/2004-01/msg00380.html (7,506 bytes)

211. Re: [Amps] Heathkit Transformers and Meters (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 20 Feb 2004 01:14:18 -0500
According to my SB-220 manual, the meters are the right number for the multimeter, but the transformers are not the correct number. Of course, they could be for the SB-221. 73, Pete N4ZR ____________
/archives//html/Amps/2004-02/msg00187.html (7,051 bytes)

212. Re: [Amps] sb-220 tuning question - closing in (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Thu, 04 Mar 2004 08:19:00 -0500
Isn't this all getting a little over-complicated? If both tune and load controls are adjusted for maximum output at rated drive (~100 watts), there should be no arcing and performance should be nomin
/archives//html/Amps/2004-03/msg00042.html (8,527 bytes)

213. Re: [Amps] 3CX1500D7 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sun, 21 Mar 2004 11:05:55 -0500
At 06:44 AM 3/20/04, Ed Briggs wrote: I wonder what the market is like for this device. Would Ham OEMs find this an attractive component when the majority have turned to 4x800? I realize they could e
/archives//html/Amps/2004-03/msg00232.html (8,857 bytes)

214. RE: [Amps] ACOM Amplifiers (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Sat, 03 Apr 2004 07:48:23 -0500
At 05:11 AM 4/2/04, AB2E Darrell wrote: This site works for me ... http://www.acom-bg.com/ 73 Darrell AB2E From: Jason Buchanan <jsb@digistar.com> To: Amps@contesting.com Subject: [Amps] ACOM Amplifi
/archives//html/Amps/2004-04/msg00019.html (7,995 bytes)

215. [Amps] Active Antenna Tuners (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Fri, 30 Apr 2004 21:59:02 -0400
One of the great benefits of my SB-220 is the relatively wide range of feedpoint impedances that it seems to be able to match. For example, my 80-meter parasitic array is cut for 3525, and at 3.8 MHz
/archives//html/Amps/2004-05/msg00009.html (7,588 bytes)

216. Re: [Amps] Trio TL-922 (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 30 Jun 2004 02:26:02 -0400
Ott, shorting across the zener diode affects the cathode bias and hence the resting plate current (with no drive), not the plate voltage. I looked at the site you mentioned -- I read some Chinese, wh
/archives//html/Amps/2004-06/msg00141.html (8,427 bytes)

217. Re: [Amps] 3-500ZG brands (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Thu, 12 Aug 2004 06:46:19 -0400
At 10:04 PM 8/11/2004, Clay W7CE wrote: I've just acquired a Kenwood TL-922A which needs a new pair of finals (one of the filaments doesn't light up). Does anyone have experience using the Taylor or
/archives//html/Amps/2004-08/msg00108.html (8,281 bytes)

218. Re: [Amps] 3-500ZG brands (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Thu, 12 Aug 2004 13:20:04 -0400
My repair was to the tube pins themselves. You could clearly see where the solder had melted out from around the filament leads, so that they wee no longer making a good high current connection to th
/archives//html/Amps/2004-08/msg00114.html (10,744 bytes)

219. [Amps] AL-1500 pi-network capabilities (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Mon, 30 Aug 2004 06:16:23 -0400
I've been toying with the idea of adding a modern amp to my SB-220 for SO2R operation. One of the things I really like about the SB-220 is that its pi network has sufficient matching range on the low
/archives//html/Amps/2004-08/msg00449.html (6,848 bytes)

220. Re: [Amps] A question! (score: 1)
Author: Pete Smith <n4zr@contesting.com>
Date: Wed, 01 Sep 2004 16:06:41 -0400
Another option is www.smallparts.com They have nylon timing pulleys and matching belts in a variety of lengths. 73, Pete N4ZR At 03:21 PM 9/1/2004, Will Matney wrote: Yep, Go to a local bearing and p
/archives//html/Amps/2004-09/msg00020.html (9,099 bytes)

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