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Total 12 documents matching your query.

1. [Amps] Trying to locate amplifier (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 5 Dec 2010 02:09:02 -0500; Many years ago (late 60's) I converted an amplifier which was a low band VHF to 20 and 15 meters. It had a pair of push pull 4CX250B or perhaps 4X150A tubes (no tube came with it). I parallel connect; /archives//html/Amps/2010-12/msg00026.html (7,034 bytes)
2. Re: [Amps] Trying to locate amplifier (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sun, 5 Dec 2010 08:21:37 -0800 (PST); Motorola may have built such an amplifier for the military. However, for the commercial FM two-way market the Motorola lowband and highband amplifiers used 8650A tubes which are the conduction cooled; /archives//html/Amps/2010-12/msg00029.html (8,664 bytes)
3. Re: [Amps] Trying to locate amplifier (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Mon, 6 Dec 2010 02:23:30 -0500; Perhaps it was a GE. I can't remember if it has two big dials or just one. One control went to the swinging link coupling. But it did have a pair of forced air cooled bypassed EF Johnson sockets for; /archives//html/Amps/2010-12/msg00034.html (9,386 bytes)
4. Re: [Amps] Trying to locate amplifier (score: 1): Author: donroden@hiwaay.net; Date: Mon, 06 Dec 2010 08:14:51 -0600; I have a high band ( 150 ) GE cabinet with a single cavity 4CX250B for $200. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co; /archives//html/Amps/2010-12/msg00035.html (10,801 bytes)
5. 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)
6. Re: [Amps] Trying to locate amplifier (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Mon, 6 Dec 2010 13:54:47 -0500; I am sure it was a low band amplifier because I used the same silver plated coil and paralleled the tubes and plate capacitors to make a pi network. I mounted a broadcast variable capacitor on a brac; /archives//html/Amps/2010-12/msg00039.html (8,570 bytes)
7. Re: [Amps] Trying to locate amplifier (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Tue, 7 Dec 2010 01:37:22 -0500; Amplifier found, It is an AM-495/GR. 25-50 MHz which is why it was easily converted to 14-21 MHz. Does anyone have one available for a reasonable price. I don't need the power supply. And it does not; /archives//html/Amps/2010-12/msg00047.html (9,336 bytes)
8. Re: [Amps] Trying to locate amplifier (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Tue, 7 Dec 2010 08:13:38 -0800 (PST); Those amplifiers used 2 of the 8560A which is basically a conduction cooled 4CX250B. The lowband versions were rated at 330 watts output and the highband versions were rated usually at 250 watts outp; /archives//html/Amps/2010-12/msg00050.html (9,799 bytes)
9. 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)
10. Re: [Amps] Trying to locate amplifier (score: 1): Author: "Steve Katz" <stevek@jmr.com>; Date: Tue, 7 Dec 2010 10:53:12 -0800; Nah, they're tetrodes, not triodes. Those amps are all set up for Class C and run fairly low anode voltage (usually); the tank circuit can handle a lot more power, they were built to transmit continu; /archives//html/Amps/2010-12/msg00052.html (11,841 bytes)
11. Re: [Amps] Trying to locate amplifier (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Tue, 7 Dec 2010 11:21:16 -0800 (PST); The tubes are definitely not triodes! The 8560A is basically a 4CX250B that is conduction cooled rather than forced air. Glen, K9STH Website: http://k9sth.com ________________________________________; /archives//html/Amps/2010-12/msg00054.html (12,369 bytes)
12. Re: [Amps] Trying to locate amplifier (score: 1): Author: Pete Lancashire <pete@petelancashire.com>; Date: Tue, 7 Dec 2010 15:24:38 -0800; a friend that does cell site service told me last year that one site owner who leases his half dozen mountain tops in the Seattle area gave notice to one paging company that if they did not come get; /archives//html/Amps/2010-12/msg00061.html (15,042 bytes)

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