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1. Re: [Amps] GS-35B efficiency (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Fri, 18 Dec 2009 22:07:48 -0700
If builders find that a GS-35B amplifier is significantly less efficient than, say, a 3-500Z amp, then could someone explain why that is so? I always thought that the efficiency is a function of the
/archives//html/Amps/2009-12/msg00476.html (7,074 bytes)

2. Re: [Amps] HV Relay (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Sat, 6 Feb 2010 13:42:42 -0700
I'm changing my 2@3-500Z amp to a single GS-35B and in the spec's for the tube it states that the warm-up time is Aprox~ 2 minute. So instead of using a power SCR in the mains to switch on the HV ban
/archives//html/Amps/2010-02/msg00153.html (9,115 bytes)

3. Re: [Amps] HV Relay (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Sat, 6 Feb 2010 15:48:10 -0700
Allan, I have no doubt that your sequencer using Russian vacuum relays (B1B and B2B) will work fine in normal operation. As I understand Mike's posting, however, he was interested in flashover protec
/archives//html/Amps/2010-02/msg00156.html (12,846 bytes)

4. Re: [Amps] Vac Relays for B+ (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Sun, 7 Feb 2010 08:25:54 -0700
Great comments, Jim and Roy. Two points. First, my 8877 Amp, described in several editions of Orr's book, was designed and built in the late 1970s. In it, as Jim noted, I used a vacuum relay to inter
/archives//html/Amps/2010-02/msg00183.html (11,438 bytes)

5. Re: [Amps] Vac Relays for B+ (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Sun, 7 Feb 2010 10:44:34 -0700
secondary and shorted are fuses. broadcasting industry chairman of CBS The 25 ohm resistor functions both as a fuse (in case of extreme overload) and partly a current limiter, e.g., when the capacit
/archives//html/Amps/2010-02/msg00190.html (8,627 bytes)

6. Re: [Amps] Resistor Before the Capacitor? (long) (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Mon, 8 Feb 2010 10:44:08 -0700
I think some commenters may have overestimated the negative impact on power supply regulation, if a "glitch" resistor is placed between the diode rectifiers and the filter capacitor of an HV supply.
/archives//html/Amps/2010-02/msg00245.html (11,471 bytes)

7. Re: [Amps] Resistor before the capacitor REDUX (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Mon, 8 Feb 2010 17:04:30 -0700
Here's the issue we're considering: What impact does a current-limiting resistor have on power supply regulation, when the resistor is placed between the rectifiers and the filter capacitor? Gary K4F
/archives//html/Amps/2010-02/msg00261.html (12,421 bytes)

8. Re: [Amps] Resistor before the capacitor REDUX (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Mon, 8 Feb 2010 18:44:28 -0700
"ORIGINAL MESSAGE: On Mon, 8 Feb 2010 17:04:30 -0700, "Jim Garland" <4cx250b at muohio.edu <http://lists.contesting.com/mailman/listinfo/amps> > wrote: REPLY: If you are going to drop the supply from
/archives//html/Amps/2010-02/msg00268.html (8,201 bytes)

9. Re: [Amps] Resistor before the capacitor REDUX (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Mon, 8 Feb 2010 19:36:22 -0700
(From Msg 1) and primary as >they are effectively in series with each other and in series with your series resistor. just part of the >current it is the TOTAL current that is a narrow pulse. All of
/archives//html/Amps/2010-02/msg00271.html (11,503 bytes)

10. Re: [Amps] resistor between FWB/FWB and HV caps. (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Tue, 9 Feb 2010 14:19:51 -0700
Interesting comments, Jim. That's pretty cool software you're using. Thanks. Pse see my detailed responses below. Basically, I get the same results from my 30V test that you do, re peak currents and
/archives//html/Amps/2010-02/msg00287.html (12,104 bytes)

11. [Amps] 30S-1 Screen Voltage Boost (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Mon, 22 Feb 2010 10:36:18 -0700
I've run my 30S-1 at a higher screen voltage for years and highly recommend it. With the higher screen voltage, the amp easily runs 1500W output (it was designed for 1000W input, to be consistent wit
/archives//html/Amps/2010-02/msg00651.html (7,956 bytes)

12. [Amps] W8ZR's 8877 Amp Schematics (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Thu, 25 Feb 2010 16:04:21 -0700
Hi Gang, I received several requests recently for schematic diagrams of my homebrew 8877 amplifier. This is an amp that was described in the Bill Orr W6SAI Handbook in several editions. I rebuilt the
/archives//html/Amps/2010-02/msg00747.html (6,892 bytes)

13. Re: [Amps] Meter Protection on W8ZR 8877 Amp (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Fri, 26 Feb 2010 13:27:25 -0700
homebrew Thanks, Bill. Yep, it was an oversight in the diagram. They're actually there in the amp. Cheap protection for expensive meters! 73, Jim W8ZR _______________________________________________
/archives//html/Amps/2010-02/msg00751.html (7,678 bytes)

14. Re: [Amps] Amps Digest, Vol 90, Issue 2 (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Tue, 1 Jun 2010 09:40:53 -0600
am trying amp has an p/s connected connected, and I have providing 2800 vdc PTT is not immediately bang, and nothing is breaker pops. T/R coaxial transformer via the plate engaged. In the a bang), I
/archives//html/Amps/2010-06/msg00023.html (9,698 bytes)

15. [Amps] HV Diode String Question (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Mon, 7 Jun 2010 21:12:45 -0600
Here's an old topic that's come up many times, but I'm still not sure of the best answer. In my homebrew amp that runs 4500V with a voltage doubler power supply, I have two series strings of rectifie
/archives//html/Amps/2010-06/msg00079.html (7,927 bytes)

16. Re: [Amps] 1N5408 vs 1N5553 (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Tue, 8 Jun 2010 15:11:10 -0600
and I was surprised to learn that the 1N5408 is made by at least 29 different manufacturers (http://www.datasheetcatalog.com/datasheets_pdf/1/N/5/4/1N5408.shtml) , and specs vary slightly among the
/archives//html/Amps/2010-06/msg00088.html (8,723 bytes)

17. [Amps] New High Efficiency 3-500Z plate caps (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Thu, 1 Jul 2010 06:25:05 -0600
Check out http://www.youtube.com/watch?v=EoVCGFPvOuk <http://www.youtube.com/watch?v=EoVCGFPvOuk&hd=1> &hd=1 for a neat video showcasing the new 3-500Z plate caps by Mike Freeman NT8O and his brother
/archives//html/Amps/2010-07/msg00001.html (6,981 bytes)

18. [Amps] Comparison of PCB-mount RF relays (score: 1)
Author: 4CX250B <4cx250b@muohio.edu>
Date: Fri, 6 Aug 2010 18:33:36 -0400
___ As Paul W9AC commented earlier I've run some comparison tests of inexpensive PCB-mount power relays in connection with my StationPro controller. The two main contenders were the Tyco/Schrack (als
/archives//html/Amps/2010-08/msg00069.html (10,036 bytes)

19. Re: [Amps] HV wires, back-to-back diodes, and B- wiring (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Sat, 11 Sep 2010 08:52:41 -0600
I've been reading these posts with interest. Some of my practices are a bit different from those discussed here. (1) HV wiring: I use ordinary red-jacketed RG-58 cable with Kings HV BNC connectors to
/archives//html/Amps/2010-09/msg00085.html (8,452 bytes)

20. Re: [Amps] HV Wires, back-to-back diodes, and B- Wiring (score: 1)
Author: "Jim Garland" <4cx250b@muohio.edu>
Date: Sun, 12 Sep 2010 10:01:08 -0600
near B- I think that's a very interesting question, Scott, and I'm looking forward to hearing other folks' opinions. I don't see any obvious way to protect such a circuit, other than fusing the HV l
/archives//html/Amps/2010-09/msg00123.html (9,051 bytes)

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