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1. Re: [Amps] Heath SB-230 conversion? (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Thu, 18 Sep 2003 22:19:31 -0400
As others have noted, the mechanical arrangement of the SB-230 with the original conduction-cooled 8873 makes fitting a more readily available axial-cooled external anode tube difficult. In examining
/archives//html/Amps/2003-09/msg00171.html (10,931 bytes)

2. RE: [Amps] NCL 2000? (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Wed, 01 Oct 2003 23:10:01 -0400
The idea of re-tubing an NCL-2000 with Svetlana tubes is quite intriguing. I would think it would be virtually certain that the 4CX400A would fit, since it is slightly smaller in diameter than the 89
/archives//html/Amps/2003-10/msg00015.html (9,958 bytes)

3. Re: [Amps] 1200 vs 1500 triodes (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Tue, 28 Oct 2003 20:15:15 -0500
There is another aspect to this discussion which I think needs to be considered. Most of my operating is during contests, and for that purpose I have a large antenna farm with multiple antennas on ea
/archives//html/Amps/2003-10/msg00275.html (12,512 bytes)

4. [Amps] Groth Turns Counters (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Fri, 26 Dec 2003 00:16:24 -0500
Does anybody know if Groth turns counters are still available? I need a couple for my rebuild of the 4-1000A amps from the old W3AU contest station of the 60s and 70s. I saw the notes from W6RU and O
/archives//html/Amps/2003-12/msg00373.html (6,837 bytes)

5. Re: [Amps] Vacuum relays in Dentron MLA-2500 (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Sat, 27 Dec 2003 16:52:10 -0500
Don, Not ordinarily one to contradict by good friend W8AV, but two vacuum relays are not the whole story. I own a MLA-2500 and have often thought about switching to vacuum relays to get away from the
/archives//html/Amps/2003-12/msg00400.html (11,066 bytes)

6. Re: [Amps] HV SAFETY QUESTION (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Fri, 23 Jan 2004 18:47:22 -0500
At 06:35 PM 1/22/04 -0700, Jim Homer wrote: I have an old Ham acquaintance that can testify to 8 inches of a medium-weight plastic-handled screwdriver being reduced in length by about 3 inches while
/archives//html/Amps/2004-01/msg00241.html (8,887 bytes)

7. Re: [Amps] Re: Amps Digest, Vol 13, Issue 52 (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Sun, 01 Feb 2004 14:29:45 -0500
I don't think a 3-500Z chimney will work with the 3CX1200A7. The *sockets* are the same, but the chimneys aren't. Even Eimac recomments a different chimney part number use with the 3CX1200. I would b
/archives//html/Amps/2004-02/msg00008.html (10,264 bytes)

8. Re: [Amps] looking for (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Fri, 18 Jun 2004 19:23:19 -0400
At 08:49 AM 6/18/04 +0200, DEHAYS Dominique wrote: I recall I found once a web page where a 2m amplifier was described . This amp used 2*8877 , and the amplifier was build around a modified surplus a
/archives//html/Amps/2004-06/msg00098.html (7,741 bytes)

9. RE: [BULK] - [Amps] Convert Heathkit SB-220 to 50Mhz (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Thu, 22 Apr 2004 23:39:50 -0400
Back in 1992 I converted an SB-220 to 50 MHz following much the same path as WB2WIK. However, I was able to achieve much the same result with less-intrusive mods. 100W of drive from an IC-756 yielded
/archives//html/Amps/2004-08/msg00219.html (9,384 bytes)

10. Re: [Amps] orphan amp? (score: 1)
Author: "David A. Pruett" <k8cc@comcast.net>
Date: Sat, 09 Oct 2004 17:07:37 -0400
I own a PT-2500A. My buddy bought the demo unit at the Dayton Hamvention in 1984. They sold it cheap rather than carry it back. My understanding was that Viewstar was own by Tom Hammond, the same Tom
/archives//html/Amps/2004-10/msg00119.html (9,355 bytes)

11. Re: [Amps] ? Plate Choke (score: 1)
Author: David Pruett <k8cc@comcast.net>
Date: Sun, 09 Jan 2005 23:10:01 -0500
At 09:21 PM 1/9/2005, Ron wrote: Hello to the Group, Anyone have a P/N and source for a plate choke ? Criteria: 50.150 Mhz Pair 3-500z in GG Pv- 3000v Thanks, Ron/K8FG... Ron, I used the Surplus Sale
/archives//html/Amps/2005-01/msg00165.html (7,331 bytes)

12. Re: [Amps] Tetrodes in GG Configuration (score: 1)
Author: David Pruett <k8cc@comcast.net>
Date: Thu, 20 Jan 2005 18:53:35 -0500
I'd like to point out another tetrode configuration which has some useful characteristics, and that is cathode driven, but not zero bias. Lew Gordon, K4VX is a well known amateur, contester, and form
/archives//html/Amps/2005-01/msg00409.html (9,070 bytes)

13. Re: [Amps] MOV - Varistor Reccomendations (score: 1)
Author: David Pruett <k8cc@comcast.net>
Date: Sat, 29 Jan 2005 17:14:22 -0500
Mike, While this is not the question you asked, I'd point out that in a bridge rectifier, each diode (or string) has to stand off the peak AC input voltage during the half-cycle that it's not conduct
/archives//html/Amps/2005-01/msg00588.html (9,006 bytes)

14. HV Multimeter? (was Re: [Amps] 8877 Test) (score: 1)
Author: David Pruett <k8cc@comcast.net>
Date: Mon, 14 Feb 2005 22:33:02 -0500
K5GW's note about testing tubes at high voltage triggered a question I wanted to ask here on the reflector. Is there a Simpson multi-meter which has the capability to read HV (say, 0-6000 KV so so)?
/archives//html/Amps/2005-02/msg00512.html (8,631 bytes)

15. Re: [Amps] Mine is bigger than yours (was: Re: Standby tubes (score: 1)
Author: David Pruett <k8cc@comcast.net>
Date: Tue, 05 Apr 2005 21:54:55 -0400
BC stations make great QTH's. I"ve been QRV on two occasions from HRVC (1390 KHz) in Tegucigalpa, Honduras thanks to my brother WB8VMN being chief engineer at the time. 180' of Rohn 25G and 120 full
/archives//html/Amps/2005-04/msg00120.html (10,590 bytes)

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