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41. Re: [Amps] Toshiba tube 7f41R (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Mon, 15 Nov 2010 14:01:08 -0500; You will have to put the tube number where it looks like a search area. It will take you to the spec.s Reading Japanese would be helpful, but I think you can eeak out what you need without that. http; /archives//html/Amps/2010-11/msg00253.html (9,038 bytes)
42. Re: [Amps] 3CX1000A7 (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Wed, 17 Nov 2010 08:42:16 -0500; If I remember correctly the FCC went bananas on some mfg of 6m high power amps because they were too easy to put on CB. I understand that everyone was reluctant to build one because you could not get; /archives//html/Amps/2010-11/msg00301.html (9,518 bytes)
43. Re: [Amps] Matched Pairs of Tubes (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Fri, 19 Nov 2010 10:22:19 -0500; I have always read that on these tubes it is good to get pairs of the same age, brand, and usage together and you were fine. I understand that they were/are built to pretty tight tolerance. I keep lo; /archives//html/Amps/2010-11/msg00354.html (9,958 bytes)
44. Re: [Amps] Matched Pairs of Tubes (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Fri, 19 Nov 2010 10:42:33 -0500; I withdraw my observation due to lack of attention to detail on my part. You are of course correct. A 4-250A is an internal anode glass envelope tube. A 4CX250(B) is an external ceramic/metal tube. A; /archives//html/Amps/2010-11/msg00355.html (8,541 bytes)
45. Re: [Amps] Trying to locate amplifier (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Mon, 6 Dec 2010 09:47:41 -0500; Moto did make some very robust VHF tube amps. Most that I have seen come through the shop over the years have been with a Moto marked conduction cooled tubes that strap to a very large heat sink in t; /archives//html/Amps/2010-12/msg00036.html (12,718 bytes)
46. Re: [Amps] Trying to locate amplifier (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 7 Dec 2010 13:54:57 -0500; I have seen these come through. I had always assumed that the tubes were basically 8873 but the size was like the 250. I think there may be a VHF that had been used for Mobile Phone service at a site; /archives//html/Amps/2010-12/msg00051.html (10,900 bytes)
47. Re: [Amps] Derating Dry Loads (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 7 Dec 2010 14:10:58 -0500; Be careful, sometimes the heat dissipation may not be the only factor. I can tell you that an internal arc at legal limit can do a lot of destruction. If the load takes it and runs away from 50 ohms; /archives//html/Amps/2010-12/msg00053.html (10,457 bytes)
48. Re: [Amps] 4 X 4-400C or 4 X 3-500Z HF amplifier (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Wed, 15 Dec 2010 10:59:39 -0500; Someone correct me if I am wrong, but I think Henry used that in one of the 4k amplifiers. Henry still has a lot of amp parts around even though they are not building any more. It may be worth a call; /archives//html/Amps/2010-12/msg00158.html (9,197 bytes)
49. Re: [Amps] 4 X 4-400C or 4 X 3-500Z HF amplifier (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Wed, 15 Dec 2010 11:38:39 -0500; I think the socket you need is: SK840. I think these trade on ebay frequently. Looking at the 4CX1000A and 5CX1500A sockets I believe the breech lock components of the 4CX1000A/4CX1500B socket can be; /archives//html/Amps/2010-12/msg00161.html (11,102 bytes)
50. Re: [Amps] 5CX1500 socket ( changed subject ) (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Thu, 16 Dec 2010 09:37:26 -0500; It might be good to keep an eye out for the old Henry 4k or 4k-2 (not ultra) that used that tube. It already has the socket and those decks (and whole amp) are plenty robust with a little freshening; /archives//html/Amps/2010-12/msg00175.html (13,498 bytes)
51. Re: [Amps] Fan for SB220 (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Fri, 17 Dec 2010 11:02:33 -0500; Does the shield increase overall heat build-up inside the amp because it is absorbing the heat? I had always thought black was a no-no. I see that you have improved air flow. Maybe that carries it al; /archives//html/Amps/2010-12/msg00187.html (12,795 bytes)
52. Re: [Amps] Blower lube (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Mon, 27 Dec 2010 09:01:40 -0500; I had a 550 and I seem to remember that the book said it could not be lubed. Mine had 4 blowers between tank compartment and tube area. They looked like something you could pick up at mouser. Putting; /archives//html/Amps/2010-12/msg00395.html (8,131 bytes)
53. Re: [Amps] Fuses (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Fri, 7 Jan 2011 09:25:04 -0500; Tessco online or Granger should have or can get any value made. There are a lot of them being used in Fixed Equipment from Motorola. About anything that is High Duty Transmitting equipment is using t; /archives//html/Amps/2011-01/msg00057.html (10,563 bytes)
54. Re: [Amps] Old cabinets for amp projects-TENTEC (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 15 Feb 2011 13:59:44 -0500; Ten tec makes enclosures. Enclosed communications racks are available thru TESSCO. Just about any size box with doors anyway. You would have to configure inside. Could make it like the old 30k and us; /archives//html/Amps/2011-02/msg00126.html (9,489 bytes)
55. Re: [Amps] Alpha 374A problem (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Mon, 21 Mar 2011 11:57:36 -0400; Could the layers of the xfrmr be coming unlaminated? This is a sound you might expect to hear if it is happening. I remember on old henry and Collins amplifiers, loose metal near the xformr or choke; /archives//html/Amps/2011-03/msg00145.html (9,243 bytes)
56. Re: [Amps] Homebrew is back.. (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 29 Mar 2011 10:50:40 -0400; Dang-it guys. Just when I was starting to be satisfied with SSB you had to go and make me think about nice, big, plate modulated AM audio again. That is going to cost me. It takes me back to many win; /archives//html/Amps/2011-03/msg00246.html (10,824 bytes)
57. Re: [Amps] VTX-X118 Tetrode mytery tube? (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Mon, 4 Apr 2011 13:04:48 -0400; It is a WAY cheaper foreign tube. I asked about getting one tubed in EIMAC. She said the difference was somewhere in the range of simply purchasing the EIMAC tubes. On that amp, the screen voltage is; /archives//html/Amps/2011-04/msg00110.html (10,197 bytes)
58. Re: [Amps] 2 more questions-- electrical (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 5 Apr 2011 10:02:36 -0400; Are you saying that the electric company ground with the short rod at the box and the first pole, who knows how far away, is better than several sunken 10' rods with very low impedance wire (Strap or; /archives//html/Amps/2011-04/msg00162.html (12,388 bytes)
59. Re: [Amps] 2 more questions-- electrical (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 5 Apr 2011 10:31:21 -0400; I also notice that he asked about "Shack" ground. Anyone who has run QRO and used only electrical grounds gets RF burns to the lips on a mic, to the underside of the forearm on the corners of chairs; /archives//html/Amps/2011-04/msg00163.html (12,232 bytes)
60. Re: [Amps] 2 more questions-- electrical (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 5 Apr 2011 11:50:45 -0400; I have always (almost?) run either balanced antennas with Baluns (yagis-dipoles). My problems happened on 75 mostly with phased sloper arrays, corner fed delta loops, and flat top 75m dipoles at 80'; /archives//html/Amps/2011-04/msg00168.html (12,830 bytes)

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