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21. [Amps] 4cx350f/j's (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 18 Nov 2002 07:39:40 -0800; [Steve Katz] The advantage of 4CX350Fs is that they're often found new surplus very inexpensively. I've used them for many years, can't tell any difference in operation between the 350F and a 250B,; /archives//html/Amps/2002-11/msg00308.html (8,468 bytes)
22. [Amps] Passive grid: How to calculate..... ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 22 Nov 2002 07:56:44 -0800; [Steve Katz] Where'd the 100V come from? E = SQRT P*R. -WB2WIK/6; /archives//html/Amps/2002-11/msg00341.html (7,788 bytes)
23. [Amps] Problem with SB-1000 Power Supply (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 2 Oct 2002 11:20:18 -0700; John, the solution is obviously to just keep talking (transmitting), since the problem only occurs when receiving! Does sound like a transformer to case internal short... -WB2WIK/6 "If everything see; /archives//html/Amps/2002-10/msg00009.html (9,266 bytes)
24. [Amps] How light can you make a 500W amplifier? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 14 Oct 2002 14:46:40 -0700; I don't believe a 1 kg power supply using a 6x multiplier at 50 Hz or 60 Hz is possible, at the current level required. Unless someone invents nearly zero-mass large-value capacitors required by the; /archives//html/Amps/2002-10/msg00136.html (11,319 bytes)
25. [Amps] voltage multiplier shown (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 15 Oct 2002 09:57:46 -0700; John, and especially Rich (AG6K), I did look up the formula for voltage multiplier regulation and ripple and a 6x multiplier used to provide 500mA when driven by a 60 Hz source is an impossibility. V; /archives//html/Amps/2002-10/msg00143.html (10,175 bytes)
26. [Amps] How light can you make a 500W amplifier? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 15 Oct 2002 11:08:16 -0700; Vic, I think he meant SB230. It's about same size as SB200 but lighter and used a single conduction-cooled tube (8873 I think-?) with internal AC PS. -WB2WIK/6 "If everything seems under control, you; /archives//html/Amps/2002-10/msg00146.html (9,767 bytes)
27. [Amps] voltage multiplier shown (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 15 Oct 2002 12:51:42 -0700; Hi Dudley, The DTR-2000 used a voltage tripler? I don't recall that...do you have a schematic? It's certainly an unusual application for a 1A supply. Of course I am aware that many amps use doublers;; /archives//html/Amps/2002-10/msg00154.html (12,892 bytes)
28. [Amps] Solid State (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 16 Oct 2002 07:43:07 -0700; That surely depends on the amplifier, but I've used the "CCI" packaged, Motorola ap-notes based solid-state amps many times and cleaned them up with Dunestar relay-switched BP filter networks. Using; /archives//html/Amps/2002-10/msg00172.html (7,733 bytes)
29. [Amps] DTR-2000L schematic (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 16 Oct 2002 10:04:44 -0700; You're correct, Dennis. Whoever posted yesterday that the DTR-2000L amplifier uses a voltage tripler was wrong. The schematic clearly shows a voltage doubler made of twelve 1kV 3A diodes and twelve 1; /archives//html/Amps/2002-10/msg00178.html (7,310 bytes)
30. [Amps] DTR-2000L schematic (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 16 Oct 2002 12:48:01 -0700; [Steve Katz] I don't doubt that at all, Bill. Well, I don't have a DTR-2000L to look at, and am only going by the schematic diagram, which shows 6 diodes and 6 capacitors in each leg of the doubler.; /archives//html/Amps/2002-10/msg00180.html (7,630 bytes)
31. [Amps] Viking Thunderbolt (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 22 Oct 2002 07:54:40 -0700; Ted, I'm quite familiar with the EFJ T-bolt, having owned one from 1973 to 1980 or so. It's no longer with me, so I can't look at it, but I remember it quite well and did several required repairs to; /archives//html/Amps/2002-10/msg00232.html (7,950 bytes)
32. [Amps] amp smoked now (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 11 Sep 2002 08:03:55 -0700; Paul, my guess is that the "only" problem is the switch, and once you replace it, all will be well. That switch is stressed pretty hard at 230V: It's about 12A flowing through the switch and just a m; /archives//html/Amps/2002-09/msg00077.html (7,581 bytes)
33. [Amps] Tank Circuit Help (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 11 Sep 2002 15:23:35 -0700; [Steve Katz] Normally a bandswitch is used at a minimum to switch input tuned circuits per band. Additionally, unless you have an awfully large "load" vacuum variable, a bandswitch is useful to swit; /archives//html/Amps/2002-09/msg00082.html (7,634 bytes)
34. [Amps] Tank Circuit Help (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 11 Sep 2002 15:53:16 -0700; [Steve Katz] Holy mackeral! You can fit all that in a chassis? 103 uH?? At what current?? (The voltage rating isn't important, unless the turns are spaced so closely they arc to each other, which is; /archives//html/Amps/2002-09/msg00084.html (11,385 bytes)
35. [Amps] Tank Circuit Help (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 12 Sep 2002 08:21:49 -0700; [Steve Katz] Aluminum will work, but I'd use copper. Roof/chimney/gutter flashing sold in Home Depot and, better, in industrial construction material outlets, is available in aluminum, galvanized st; /archives//html/Amps/2002-09/msg00091.html (32,857 bytes)
36. [Amps] diode string configuration (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 13 Sep 2002 07:49:20 -0700; Lynn, why would you need to parallel 1N5408's? The 5408 is a 3A diode, at lead temperature of 105 degrees C, which is pretty easy to maintain with the slightest trickle of air flowing past them. I'd; /archives//html/Amps/2002-09/msg00096.html (8,059 bytes)
37. [Amps] Heising Choke (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 17 Sep 2002 16:17:57 -0700; //Interestingly, I can get "that old AM sound" out of my solid-state TS-850S/AT, to the extent that when I use AM (29.01+) and tell the boatanchor crowd that I'm using a Valiant, every one of them b; /archives//html/Amps/2002-09/msg00119.html (9,631 bytes)
38. [Amps] Gonset Amplifier (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 18 Sep 2002 09:09:58 -0700; [Steve Katz] What's the model number of the amplifier? I only remember the GSB-200 and GSB-201, which used 4 x 811As and both were called "1 kW" (DC input) amplifiers. What's this one? -WB2WIK/6; /archives//html/Amps/2002-09/msg00127.html (8,289 bytes)
39. [Amps] Gonset Amplifier (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 18 Sep 2002 09:22:21 -0700; [Steve Katz] My guess is he's wrong. It would take an awful lot of 807's to run 500 Watts..... -WB2WIK/6; /archives//html/Amps/2002-09/msg00128.html (9,726 bytes)
40. [Amps] A general question about why anodes get hot (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 18 Sep 2002 11:35:20 -0700; But Maury, tubes are much prettier, especially in a dark room. No comparison. -WB2WIK/6 "If everything seems under control, you're just not going fast enough." - Mario Andretti; /archives//html/Amps/2002-09/msg00132.html (9,576 bytes)

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