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21. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 28 Dec 2003 20:19:01 -0800; Dr. William J. Schmidt, II wrote: So you mean I can just replace my bias supply with a charged capacitor.. .since you think the tube puts no current load on the bias supply? If it is pure AB1, never; /archives//html/Amps/2003-12/msg00442.html (8,350 bytes)
22. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Mon, 29 Dec 2003 08:20:30 -0800; R.Measures wrote: Dr. William J. Schmidt, II wrote: So you mean I can just replace my bias supply with a charged capacitor.. .since you think the tube puts no current load on the bias supply? If it i; /archives//html/Amps/2003-12/msg00452.html (10,308 bytes)
23. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Mon, 29 Dec 2003 12:22:00 -0800; Bill L. Fuqua wrote: The bias due to the grid leak resistor only exist during times drive is applied that is why class C amplifiers in many ham transmitters have Clamp tubes on the screen grids. They; /archives//html/Amps/2003-12/msg00455.html (9,647 bytes)
24. Re: [Amps] soft start circuits (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Thu, 08 Jan 2004 10:26:31 -0800; PAUL HEWITT wrote: The SSR manufacturers recommend MOV's at the line side terminal to avoid DV/DT turn-on. And don't forget RF filtering to avoid RF turn-off (I learned this the hard way). -- 73, Vic; /archives//html/Amps/2004-01/msg00094.html (6,802 bytes)
25. Re: [Amps] Power-off tube cooling (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sat, 17 Jan 2004 09:24:52 -0800; RFlabnotes@aol.com wrote: My simple-minded physical reasoning says that when the power is all removed, there can be no additional heat-rise. So, at least the filament for a short time is no better or; /archives//html/Amps/2004-01/msg00178.html (8,097 bytes)
26. Re: [Amps] info on al-1200 amp (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 25 Jan 2004 08:32:21 -0800; ken cubilo wrote: I just put a ameritron al-1200 on line a couple of days ago. I am noticing that the suggested load capacitor settings are all much lower than the manual suggested settings, for max; /archives//html/Amps/2004-01/msg00280.html (8,323 bytes)
27. Re: [Amps] #18 gauge wire (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 27 Jan 2004 19:10:03 -0800; k7fm wrote: "I'm in need of 18 ga enamel coated wire for winding toroid inductors." Fortunately, I see that a source was found. However, I am slightly surprised and mildly disappointed that there was; /archives//html/Amps/2004-01/msg00314.html (7,477 bytes)
28. Re: [Amps] one way coupler (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sat, 31 Jan 2004 14:07:49 -0800; Steve wrote: I tried running two smaller (HF1250) amps each feeding one element of a phased vertical. One amp receives a lot of reflected power from the other element. I would like to know if there i; /archives//html/Amps/2004-01/msg00381.html (7,802 bytes)
29. Re: [Amps] 9913 cable (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 10 Feb 2004 08:17:12 -0800; kce wrote: This past weekend I was loading up a amp into a OCF dipole fed through a 4:1 balun with 9913 belden cable. When I hit the 800 watt mark a big spark, so I figure ok the 4:1 went west on me.; /archives//html/Amps/2004-02/msg00062.html (7,776 bytes)
30. [Amps] SB201 10-meter mod (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 10 Feb 2004 08:31:43 -0800; I recently was asked for details about activating the 10m band on an SB201. I remember that there were changes to the input network as well as the tank circuit. Since I did this in 1979, somehow the; /archives//html/Amps/2004-02/msg00063.html (7,727 bytes)
31. Re: [Amps] tube cooling (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 15 Feb 2004 07:19:14 -0800; Mark Beckwith wrote: Let me ask my question another way. I have an Alpha 86 which is the loudest thing in my shack. <snip> Does anyone have any thoughts on quieting an Alpha 86? My only thought is th; /archives//html/Amps/2004-02/msg00120.html (8,264 bytes)
32. Re: [Amps] SB221 (220) Input SWR (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Tue, 17 Feb 2004 07:35:57 -0800; Gudguyham@aol.com wrote: It is pretty difficult to adjust a coil while the amp is on, some fancy ingenuity is in order, but it should be adjusted. Contact me if you decide you want a coil. 73 Louie W; /archives//html/Amps/2004-02/msg00151.html (7,616 bytes)
33. Re: [Amps] sb-220 on 17 meters (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 22 Feb 2004 09:30:25 -0800; peter wrote: I recently aquired a sb-220. When I try to tune up the amp on 17 meters using the 15 meter band switch I get only 300 watts out and both tubes really are working hard. I get 1kw out on 1; /archives//html/Amps/2004-02/msg00206.html (8,159 bytes)
34. Re: [Amps] sb-220 non uniform grid current ?? (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Thu, 26 Feb 2004 07:29:18 -0800; Dan Sawyer wrote: The following data was collected from an antenna with an SWR of about 1.5. Looks normal to me. Just increase the loading slightly past the point of maximum output. Grid current will; /archives//html/Amps/2004-02/msg00257.html (8,534 bytes)
35. Re: [Amps] High SWR on 15 mtrs for SB220 - Follow-up (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Fri, 19 Mar 2004 07:45:29 -0800; Bill Spickler wrote: One last thought was to try a different length of coax between the 940 and the amp. I was using a 44.5" piece of RG8U. I added another short coax of the same length (kept the ori; /archives//html/Amps/2004-03/msg00205.html (7,912 bytes)
36. Re: [Amps] Transformer taps (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 21 Mar 2004 21:09:25 -0800; Gary Schafer wrote: I have a plate transformer that has taps at 2000, 2500 and 3000 with a common center tap. Obviously made for a full wave rectifier to supply 1000, 1250 or 1500 volts rectified. I; /archives//html/Amps/2004-03/msg00240.html (7,667 bytes)
37. Re: [Amps] Solid State Relays (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Fri, 26 Mar 2004 07:43:18 -0800; Glenn McNeil wrote: Anyone had any experience using the Opto22 series of SSR's in Power Supply construction ? There was a recent discussion of using SSRs on the reflector. Some like them, some don't.; /archives//html/Amps/2004-03/msg00285.html (7,671 bytes)
38. [Amps] Relays for RF switching (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Wed, 14 Apr 2004 22:11:29 -0700; I needed a remote (indoor) antenna switching unit, and since I had everything I needed in my junkbox, I decided to build it instead of paying $140+ to Ameritron. I used some relays that I had purchas; /archives//html/Amps/2004-04/msg00095.html (7,722 bytes)
39. [Amps] More on RF relays (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sat, 17 Apr 2004 14:09:42 -0700; There were so many answers to my question, that I thought I would describe the relays I finally used. They are NTE R10-11D10-12 DPDT relays, rated 10A/240V. They are open-frame relays in little plast; /archives//html/Amps/2004-04/msg00108.html (7,235 bytes)
40. Re: [Amps] exciter compression ?? (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Sun, 16 May 2004 06:51:28 -0700; Dan Sawyer wrote: If the drive is turned down sufficiently to prevent gross overdriving the 'average' drive seems to be too low to be effective. How do you know the 'average drive is too low'? If you; /archives//html/Amps/2004-05/msg00135.html (7,428 bytes)

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