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41. Re: [Amps] Trouble with LK500-ZB (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Thu, 20 May 2004 13:55:03 -0700
CGranski@aol.com wrote: Have an Amp Supply LK500-ZB that has developed a problem on 160 meters. This amp uses a pair of 3-500's in grounded grid. Power output on a Bird has dropped to ~400 watts max
/archives//html/Amps/2004-05/msg00177.html (7,901 bytes)

42. Re: [Amps] proposed rule changes about amps (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sat, 29 May 2004 08:31:54 -0700
Thomas Hix wrote: What do you think about the FCC proposals which will once again allow the manufacture of amps designed to operate on frequencies above 15 meters.....without modification that is. In
/archives//html/Amps/2004-05/msg00261.html (7,814 bytes)

43. Re: [Amps] rebuilding glass tubes (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 04 Jun 2004 07:39:45 -0700
R.Measures wrote: ? Econco reportedly tried rebuilding 4-1000As but it proved to economically unfeasible. The advantage of ceramic-metal tubes is that they are literally silver-soldered together, so
/archives//html/Amps/2004-06/msg00018.html (7,961 bytes)

44. Re: [Amps] burnt-looking adhesive/sealant ... ? (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 19 Jul 2004 08:18:22 -0700
Mark Beckwith wrote: There is an old Henry 2K Desk version on eBay (auction #5709816071). I would assume that the choke may have burned out at some time (possibly due to a series resonance). The guy
/archives//html/Amps/2004-07/msg00121.html (7,964 bytes)

45. Re: [Amps] Need Diagnostic help (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 16 Aug 2004 22:54:47 -0700
Thomas Hix wrote: OK that is 2 different amps that had the same exact symptoms while at my location hooked to my 240 line.......both amps were making the arcing/buzzing sound inside the amp and both
/archives//html/Amps/2004-08/msg00167.html (7,411 bytes)

46. Re: [Amps] RF exposure limits in reality (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 18 Aug 2004 11:21:55 -0700
jsb@digistar.com wrote: Does anyone have any information as to "real life" exposure limits for adults, children and newborns at various frequencies? I've seen the generic exposure limit ratings that
/archives//html/Amps/2004-08/msg00202.html (8,210 bytes)

47. Re: [Amps] RF exposure limits in reality (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 18 Aug 2004 12:07:08 -0700
jsb@digistar.com wrote: The thing i'm confused about is the difference, and I mean the REAL difference, between controlled and uncontrolled environments. My dipoles are at around 35 to 38 feet off th
/archives//html/Amps/2004-08/msg00207.html (8,744 bytes)

48. Re: [Amps] GBR and radiation exposure (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 20 Aug 2004 07:51:48 -0700
John Nelson wrote: HF broadcast sites run a lot of ERP and the field strength at ground level can be very high in certain areas. However, BBC transmitter engineers seem to live long and happy lives.
/archives//html/Amps/2004-08/msg00229.html (8,106 bytes)

49. Re: [Amps] Centurion cooling improvement ideas for AM service (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 25 Aug 2004 12:44:57 -0700
R.Measures wrote: Thanks, Joe. So this means that if adopted, 10m FM as well as AM will be illegal. The bandwidth allowed in 29.0 - 29.7 MHz is 16 KHz. There is a specific provision to allow DSB AM i
/archives//html/Amps/2004-08/msg00309.html (9,996 bytes)

50. Re: [Amps] Audio BW -- Please just let us operate!! (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 27 Aug 2004 11:52:17 -0700
Let me try to move this discussion to a more, er, constructive plane. A possible solution to the problem of bandwidth vs. quality is to develop of form of digital audio encoding that employs a data c
/archives//html/Amps/2004-08/msg00400.html (9,304 bytes)

51. Re: [Amps] Audio BW -- Please just let us operate!! (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Fri, 27 Aug 2004 13:03:39 -0700
Paul Christensen wrote: http://www.aorusa.com/ard9800.html With a bit of data augmentation, such a product has real promise for those wanting to explore high fidelity audio on the HF bands. The modul
/archives//html/Amps/2004-08/msg00403.html (11,377 bytes)

52. Re: [Amps] AL-1500 pi-network capabilities (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 30 Aug 2004 08:29:32 -0700
R.Measures wrote: On Aug 30, 2004, at 3:16 AM, Pete Smith wrote: One of the things I really like about the SB-220 is that its pi network has sufficient matching range on the low bands so that, for ex
/archives//html/Amps/2004-08/msg00452.html (8,318 bytes)

53. Re: [Amps] AL-1500 pi-network capabilities (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 30 Aug 2004 09:03:53 -0700
mike kendall wrote: I thought Ameritron was using PI-L networks vice PI networks? If that is the case, doesn't a PI-L network have a more limited matching range than a PI, but much better harmonic su
/archives//html/Amps/2004-08/msg00453.html (8,266 bytes)

54. Re: [Amps] Re: load capacitor ratings (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 30 Aug 2004 15:33:01 -0700
Roy Koeppe wrote: Will, no. What you describe applies to a Pi-net, not a Pi-L. BTW, do you have a call sign? 73, Roy K6XK Will wrote: "Simple, Determine the voltage across the 50 ohm load from the po
/archives//html/Amps/2004-08/msg00460.html (7,400 bytes)

55. Re: [Amps] How do I determine Class (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Tue, 31 Aug 2004 20:32:59 -0700
Jim Isbell wrote: On pages 202-205 of the 1956 "Radio Amateurs Handbook" (ARRL) there is an amplifier described called "Parallel Tetrodes in a High Power Amplifier" How do I, from that description an
/archives//html/Amps/2004-08/msg00486.html (8,612 bytes)

56. Re: [Amps] ARRL Amplifier book (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sun, 05 Sep 2004 12:07:10 -0700
RICHARD GEORGE wrote: ARRL AMPLIFIER BOOK: Just received mine. A little disappointed, but should have known. It of course is all reprints of articles from QST and QEX. The thing that surprised me is
/archives//html/Amps/2004-09/msg00079.html (7,404 bytes)

57. Re: [Amps] re cooling of coils (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sun, 05 Sep 2004 15:14:09 -0700
CLIVE COLLINS wrote: Their answer after a lot of research was to make the exhaust valve stem hollow and fill it with Sodium with significantly good results. Sodium valves were used in a lot of intern
/archives//html/Amps/2004-09/msg00084.html (7,635 bytes)

58. Re: [Amps] New Panasonic Tube Radio (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Mon, 06 Sep 2004 19:39:15 -0700
RICHARD GEORGE wrote: If they sound "different" then solid state then one or the other is distorted. A real amplifier reproduces 100% of what is put in to it. Tube audio is a bunch of BS for the un-e
/archives//html/Amps/2004-09/msg00149.html (9,053 bytes)

59. Re: [Amps] ARCO compression trimmer caps (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Sat, 11 Sep 2004 08:23:44 -0700
Radio WC6W wrote: Sounds like you are dealing with a type 30 padder. Your friend is correct about the size. The thread is standard, albeit rare. I have thought about (but haven't tried) getting a sli
/archives//html/Amps/2004-09/msg00196.html (8,096 bytes)

60. Re: [Amps] output ckts. (score: 1)
Author: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 15 Sep 2004 17:18:44 -0700
carl seyersdahl wrote: I don't want to reveal my age, but many, many years ago, (late 40's -mid50's maybe) there was a "multiband" tuning unit available, which , as I recall was certainly not good fo
/archives//html/Amps/2004-09/msg00271.html (8,059 bytes)

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