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1. Re: [Amps] Dummy Loads & Wattmeters (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 02 Dec 2009 12:43:35 -0500; I have measured the Cantenna with 4 different ohmmeters, HP-410B, HP-410C, a DVM, and VIZ multimeter. They all read the same, +/- 1 ohm. Who knows what the Cantenna has been subjected to. I bought it; /archives//html/Amps/2009-12/msg00038.html (9,317 bytes)
2. [Amps] Dummy Loads & Wattmeters (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 02 Dec 2009 12:15:31 -0500; A little education, please. I am working on restoring an old transceiver and linear. I have a Bird 43 wattmeter and a Heath Cantenna dummy load. The wattmeter is for 50 ohm impedance and I measure th; /archives//html/Amps/2009-12/msg00035.html (7,745 bytes)
3. Re: [Amps] [ham_amplifiers] Sweep Tube Amp (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 26 Nov 2009 11:50:53 -0500; I am driving it with a SBE-33 which is the companion transceiver that this amp was designed for. It solid state except for the driver and finals, a pair PL-500's. It will put out close to specified o; /archives//html/Amps/2009-11/msg00274.html (17,602 bytes)
4. [Amps] Sweep Tube Amp (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 26 Nov 2009 08:55:47 -0500; I recently acquired a sweep tube amp and I got it for nostalgic reasons. This is my first experience with one of these beasts. It is the Side Band Engineers matching amp for an SBE-33 which was first; /archives//html/Amps/2009-11/msg00273.html (7,633 bytes)
5. Re: [Amps] B- questions (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Mon, 09 Nov 2009 11:02:44 -0500; Isn't it also true that in a grid driven amplifier, the cathode is connected to ground and the only B- connection to ground is through the plate current meter. This is done so the plate current meter; /archives//html/Amps/2009-11/msg00140.html (9,548 bytes)
6. Re: [Amps] Fixing scratched meters (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Tue, 08 Sep 2009 17:48:09 -0400; Take a look at the Novus line of cleaning and polishing compounds for plexiglass. Any marine or plastic supply houses should carry them. David KC4DH _______________________________________________ Am; /archives//html/Amps/2009-09/msg00107.html (7,426 bytes)
7. Re: [Amps] Wire size (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Tue, 08 Sep 2009 09:01:17 -0400; PEW means solderable polyester. I am assuming the 0.7 is the wire size in millimeters or 0.0276 in inches which would put it in between 21 and 22 gauge. David KW4DH __________________________________; /archives//html/Amps/2009-09/msg00089.html (7,680 bytes)
8. Re: [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Mon, 10 Aug 2009 08:30:04 -0400; Here is a question about the NEC code. Is it legal to have more than one branch circuit in a single switch box? One time I was installing a new garbage disposal. The switch for the disposal was in a; /archives//html/Amps/2009-08/msg00219.html (9,408 bytes)
9. Re: [Amps] 240V Outlet and money (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Mon, 10 Aug 2009 08:15:31 -0400; What about those of us who are retired and live on a fixed income? Running a 240V line into the ham shack is a major investment. I use BA gear because I like it and like working on it, I bought it ye; /archives//html/Amps/2009-08/msg00217.html (10,409 bytes)
10. Re: [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 09 Aug 2009 20:30:12 -0400; I have never looked into the problem but reconfiguring the Invader 2000 to lift the neutral off the chassis might be a major effort. It uses two separate power supplies on interconnected chassis. The; /archives//html/Amps/2009-08/msg00183.html (13,189 bytes)
11. Re: [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 09 Aug 2009 19:43:47 -0400; OK, let me ask a question here. All of my breaker are 15A. Can I replace any of them with 20A breakers. Wiring is 12/2 with ground. David Kc2JD/4 _______________________________________________ Amps; /archives//html/Amps/2009-08/msg00176.html (9,655 bytes)
12. Re: [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 09 Aug 2009 12:58:14 -0400; Well, the Johnson 2000 PS is an example of old construction. The neutral is connect to the chassis and the 120V circuits are wired between one hot phase and the chassis so you have to make sure you h; /archives//html/Amps/2009-08/msg00149.html (11,291 bytes)
13. [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 09 Aug 2009 12:00:25 -0400; I need to put in a new 240V outlet at my operating position. Since one of my amp power supplies, a Johnson 2000 has the low voltage portion operating on 120V, I suppose I have to put in a 3 wire plus; /archives//html/Amps/2009-08/msg00146.html (6,987 bytes)
14. Re: [Amps] How do you measure HV with reasonable accuracy? (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Fri, 07 Aug 2009 07:38:22 -0400; I don't know what you are trying to do and how much accuracy you want, but I picked up an old RCA VTVM with a HV probe for less than $20. Without out going out to the shop to look at it, I think it m; /archives//html/Amps/2009-08/msg00121.html (10,104 bytes)
15. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 05 Aug 2009 16:24:47 -0400; Oops, I left out 0.1 in my reply. David _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-08/msg00089.html (11,168 bytes)
16. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 05 Aug 2009 16:21:27 -0400; Manfred, Maybe I have left out a piece that is pertinent to this discussion. The SBE-33 does not use a transformer in the HV power supply. It has a voltage quadrupler from line voltage to a nominal 4; /archives//html/Amps/2009-08/msg00088.html (11,845 bytes)
17. Re: [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 05 Aug 2009 08:24:49 -0400; Manfred, Maybe my nomenclature of plate bypass capacitor is incorrect. It is capacitor connected to the DC feed end of the plate choke. I have never seen a capacitor of that large value used for that; /archives//html/Amps/2009-08/msg00084.html (10,578 bytes)
18. [Amps] Plate Bypass Capacitor (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Tue, 04 Aug 2009 11:00:02 -0400; I am restoring a SBE-33 transceiver, don't ask why, and the plate bypass capacitor is a 0.1 uF paper capacitor. There is also a 0.1 uF paper capacitor as a cathode bypass on the pair of PL-500's. Is; /archives//html/Amps/2009-08/msg00079.html (7,162 bytes)
19. Re: [Amps] HT-33A (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sat, 25 Jul 2009 08:22:37 -0400; The problem with the HT-33A is the tube. PL-172's have a propensity to leak. Since they are no longer being made, a good one is difficult to find and expensive when you do. A good PL-172 is probably; /archives//html/Amps/2009-07/msg00333.html (8,500 bytes)
20. Re: [Amps] Silver plating (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Thu, 09 Apr 2009 18:12:02 -0400; The product is call Cool-Amp, $30 for a 2 ounce jar. Electricians use it on buss bars. You take a wet rag, rub it on, and rinse. David KC2JD/4 _______________________________________________ Amps mai; /archives//html/Amps/2009-04/msg00110.html (12,133 bytes)

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