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1. Re: [Amps] Vernier knobs? (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 3 Oct 2009 14:27:22 EDT; It sounds like for what you are looking for you will have to make something up from parts. A vernier knob turns counter with a center knob marked with perhaps a degree wheel to count the increments o; /archives//html/Amps/2009-10/msg00047.html (7,270 bytes)
2. Re: [Amps] Silver Plating Tank Coil ?? (score: 1): Author: ToddRoberts2001@aol.com; Date: Sun, 20 Sep 2009 04:42:07 EDT; Hi All, Thanks for the comments on Gold plating a tank coil. I think one thing that was overlooked is Gold plating is usually extremely thin, on the order of 1 or 2 microns, or 0.04 to 0.08 mil. At H; /archives//html/Amps/2009-09/msg00254.html (7,762 bytes)
3. Re: [Amps] Silver Plating Tank Coil ?? (score: 1): Author: ToddRoberts2001@aol.com; Date: Sun, 20 Sep 2009 00:10:03 EDT; Hi All, If the main goal is to prevent tarnish on a tank coil and keep it looking nice, wouldn't gold plating be the best to use? Even silver will become blackened with tarnish after a few years out; /archives//html/Amps/2009-09/msg00250.html (7,972 bytes)
4. [Amps] QEX Article on EER (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 22 Aug 2009 14:16:40 EDT; Hi All, Wanted to pass along there was an interesting article in the new Sept-Oct issue of QEX magazine by Mike Hamel, WO1U called Phase Controlled Differential Drive for EER Amplifiers. He came up w; /archives//html/Amps/2009-08/msg00383.html (6,703 bytes)
5. Re: [Amps] SGC-Mini Lini (score: 1): Author: ToddRoberts2001@aol.com; Date: Sun, 9 Aug 2009 22:54:16 EDT; Does anyone out there actually own a Mini Lini? 73 Bill wa4lav ______________________________________________________________ I don't think SGC ever actually produced any of the Mini-Linis for sale.; /archives//html/Amps/2009-08/msg00191.html (7,121 bytes)
6. Re: [Amps] Cleaning Cigarette tar....? (score: 1): Author: ToddRoberts2001@aol.com; Date: Fri, 31 Jul 2009 19:27:57 EDT; Picked up an amp the looks like its been around smokers.....Any thoughts on best way to try and clean up most of the tar / residue? Thanks... Rich N7TR _______________________________________________; /archives//html/Amps/2009-07/msg00452.html (8,281 bytes)
7. Re: [Amps] HV switch-mode power supply (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 23 May 2009 13:28:33 EDT; That is impressive, but IMO, it needs to be done by the utilities, not by each homeowner. Barring some technological breakthrough, they have an economy of scale that we individuals can not match at p; /archives//html/Amps/2009-05/msg00173.html (8,816 bytes)
8. Re: [Amps] filament transformers (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 16 May 2009 10:29:45 EDT; What has happened to "roll your own" custom filament transformers? I have never purchased a commercially made filament transformer after building more than 40 amplifiers over 25 years....I still roll; /archives//html/Amps/2009-05/msg00085.html (10,579 bytes)
9. Re: [Amps] Silver plating (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 11 Apr 2009 05:31:59 EDT; Hi All, Very interesting info on silver plating an HF tank coil, thanks. From all I have read it sounds like silver plating a tank coil is nice for aesthetic reasons but does little if any to improve; /archives//html/Amps/2009-04/msg00129.html (8,996 bytes)
10. Re: [Amps] Microwave Transformers? (score: 1): Author: ToddRoberts2001@aol.com; Date: Wed, 11 Mar 2009 12:12:26 EDT; A lot have quite high resistance windings for the power rating, so will give poor regulation and run hot on continuous load. Most also have too few turns on the primary for continuous energisation, a; /archives//html/Amps/2009-03/msg00310.html (9,867 bytes)
11. Re: [Amps] caps across rectifier diodes (score: 1): Author: ToddRoberts2001@aol.com; Date: Tue, 3 Mar 2009 11:52:57 EST; Back when I first started building some low power transmitters I always seemed to notice a slight hum or buzz superimposed on the carrier until I bypassed the power supply diodes with .01 caps across; /archives//html/Amps/2009-03/msg00102.html (8,734 bytes)
12. Re: [Amps] 1/4" shaft connectors (score: 1): Author: ToddRoberts2001@aol.com; Date: Fri, 26 Sep 2008 21:14:39 EDT; Hil, Surplus Sales of Nebraska has 1/4 x 1/4 shaft couplers for $4 each, $3.50 each 3 or more or $3.25 each for 20 or more. 73 Todd WD4NGG **Looking for simple solutions to your real-life financial c; /archives//html/Amps/2008-09/msg00220.html (8,259 bytes)
13. Re: [Amps] Class-E Amplifiers (score: 1): Author: ToddRoberts2001@aol.com; Date: Fri, 29 Feb 2008 16:05:05 EST; In a message dated 2/29/2008 3:04:05 P.M. Eastern Standard Time, wlfuqu00@uky.edu writes: You can't simply tune out the capacitance with inductance and say you have no power loss on the input of the; /archives//html/Amps/2008-02/msg00225.html (8,099 bytes)
14. Re: [Amps] Class-E Amplifiers (score: 1): Author: ToddRoberts2001@aol.com; Date: Fri, 29 Feb 2008 13:24:14 EST; In a message dated 2/29/2008 10:14:29 A.M. Eastern Standard Time, wlfuqu00@uky.edu writes: Class E amplifiers have high efficiency but what about gain and drive power. Some that I have see have about; /archives//html/Amps/2008-02/msg00220.html (8,169 bytes)
15. Re: [Amps] Vacuum Variable Fatigue Failures (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 16 Feb 2008 16:01:09 EST; I was looking closely at the mechanical marvel that is a Jennings Vacuum variable capacitor. I am wondering about whether the copper bellows arrangement that allows extension and contraction of the "; /archives//html/Amps/2008-02/msg00106.html (7,031 bytes)
16. Re: [Amps] Tranformer Suppliers (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 8 Dec 2007 16:24:15 EST; I found these listings in AF4K's Ham Radio Repair pages : Heyboer Transformer Inc. 17382 Hayes Grand Haven, MI 49417 Phone: 616-842-5830 E-mail: heyboertransform@novagate.net They have rewound severa; /archives//html/Amps/2007-12/msg00082.html (7,498 bytes)
17. Re: [Amps] Tranformer Suppliers (score: 1): Author: ToddRoberts2001@aol.com; Date: Fri, 7 Dec 2007 18:50:43 EST; In a message dated 12/7/2007 6:05:15 PM Eastern Standard Time, sccook1@cox.net writes: Where can an individual purchase core material, paper, wire, etc? We may need to get serious about winding our o; /archives//html/Amps/2007-12/msg00048.html (7,449 bytes)
18. Re: [Amps] Winding large inductors (score: 1): Author: ToddRoberts2001@aol.com; Date: Wed, 21 Nov 2007 01:00:01 EST; In a message dated 11/20/2007 4:23:05 PM Eastern Standard Time, K7FL@arrl.net writes: I need to construct a 35uH air inductor using .250 copper tubing. D is around 5"; L = 10 inches. I can play with; /archives//html/Amps/2007-11/msg00298.html (8,366 bytes)
19. Re: [Amps] Some thoughts on a transistorized legal limitamplifier... (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 13 Oct 2007 13:29:37 EDT; Start with the 1500 watt peak output amplifier described in the old APT application note, APT9701, which posits 25¢/watt for a Class C amplifier section with 70% efficiency at 27 MHz (ISM band,; /archives//html/Amps/2007-10/msg00170.html (7,305 bytes)
20. Re: [Amps] 8877 Longetivity (score: 1): Author: ToddRoberts2001@aol.com; Date: Sun, 28 Jan 2007 15:02:59 EST; One way I have done it is to make my own AC panel voltmeter using a low ac ma range meter and variable resistor and calibrate it with a good quality AC RMS DVM like a Fluke. Likewise you can check th; /archives//html/Amps/2007-01/msg00299.html (7,465 bytes)

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