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Total 17 documents matching your query.

1. [TenTec] Centurion Amp Woes (score: 1): Author: "Charles Delaune" <chas118@cableone.net>; Date: Sun, 8 Oct 2006 10:41:56 -0500; I'm having an on going problem with my NEW Centurion. Several weeks ago the line fuses blew for no apparent reason. The amp had been on for several hours, but in Standby mode. All of a sudden the amp; /archives//html/TenTec/2006-10/msg00183.html (9,227 bytes)
2. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Duane Calvin" <ac5aa1@gmail.com>; Date: Sun, 8 Oct 2006 11:28:29 -0500; My Centurion, vintage ~1998, ran flawlessly after (1) an early life (~1 hr operation) fail of the bias transistor - I replaced with TT help, and (2) at ~ 3 years of age one of the 3-500ZG's failed wi; /archives//html/TenTec/2006-10/msg00188.html (10,175 bytes)
3. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 08 Oct 2006 11:15:28 -0600; There was a previous amplifier sold as a Heathkit and a commercial maker. It had a similar failure mode, wreck the middle of the high voltage winding or the plate transformer while sitting at idle. T; /archives//html/TenTec/2006-10/msg00193.html (10,895 bytes)
4. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "RB" <K9RB@bellsouth.net>; Date: Sun, 8 Oct 2006 15:26:45 -0400; Charley, It sounds to me likely to be a plate to grid short in one of the 3-500Z tubes rears it ugliness only intermittently, sitting idle. This is a common mode of failure with old 3-500Z tubes. It; /archives//html/TenTec/2006-10/msg00194.html (12,143 bytes)
5. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "John K Gotwals" <john@gotwals.com>; Date: Sun, 8 Oct 2006 16:40:00 -0400; I was intrigued by Rog's longevity recommendation for "Instant On" tubes, since I use a Drake L-4B amplifier. For ordinary tungsten light bulbs the bulb's life can be shortened by frequent turn-on/of; /archives//html/TenTec/2006-10/msg00195.html (8,767 bytes)
6. Re: [TenTec] Centurion Amp Woes (score: 1): Author: jamesmozzillo@aol.com; Date: Sun, 08 Oct 2006 17:00:31 -0400; Probably the best method is not the instant on but keeping the filament on at a warm setting and turning off the high voltage supply. This uses minimal electrical energy while keeping the cathode war; /archives//html/TenTec/2006-10/msg00196.html (10,438 bytes)
7. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Charles Delaune" <chas118@cableone.net>; Date: Sun, 8 Oct 2006 16:41:31 -0500; Rog, My Centurion is less than 3 months old. The tubes supplied with the amp ARE a matched pair of 3-500ZG's from RF parts. Also, the cooling fan is NOT sluggish and there are no obstructions of air; /archives//html/TenTec/2006-10/msg00197.html (16,138 bytes)
8. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Carter, K8VT" <k8vt@ameritech.net>; Date: Sun, 08 Oct 2006 17:42:29 -0400; I believe he said it was a NEW amplifier...although even "new" tubes can develop a short. This could be a possibility. I am the second owner of a ca. 1994 Centurion and my filament voltage was above; /archives//html/TenTec/2006-10/msg00198.html (10,117 bytes)
9. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Charles Delaune" <chas118@cableone.net>; Date: Sun, 8 Oct 2006 16:54:33 -0500; John, I, for one, have never heard of "Instant On" 3-500Z's. But, that's besides the point. My point is that if the amp has been designed properly and there are no defective parts (one would think th; /archives//html/TenTec/2006-10/msg00199.html (10,481 bytes)
10. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Charles Delaune" <chas118@cableone.net>; Date: Sun, 8 Oct 2006 17:05:19 -0500; Jim, I agree! That was and still is the method with "instant on" CRT equipped T.V. Charlie - N5BLY Probably the best method is not the instant on but keeping the filament on at a warm setting and tur; /archives//html/TenTec/2006-10/msg00200.html (11,770 bytes)
11. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Pfizenmayer" <pfizenmayer@worldnet.att.net>; Date: Sun, 8 Oct 2006 15:11:07 -0700; Had to grimace - it ain't funny -- same deal exactly here - the 238 and the ext speaker are OK . 73 de Hank K7HP _______________________________________________ TenTec mailing list TenTec@contesting; /archives//html/TenTec/2006-10/msg00201.html (8,717 bytes)
12. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 08 Oct 2006 16:18:11 -0600; Sometimes tube filaments are supplied with current limited transformers to reduce the inrush. Lamp inrush current can be 16 times operating current, that's why a thin filament seems to nearly always; /archives//html/TenTec/2006-10/msg00202.html (12,301 bytes)
13. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 08 Oct 2006 16:36:00 -0600; That resistor also helps limit inrush current. Measuring 5 volts AC accurately to a couple percent is not a trivial problem, many multimeters have poor AC accuracy that gets worse at low voltages. To; /archives//html/TenTec/2006-10/msg00203.html (10,872 bytes)
14. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "RB" <K9RB@bellsouth.net>; Date: Sun, 8 Oct 2006 18:42:34 -0400; The 3-500Z type tubes were designed with tungsten-thoriated filament material. This is a material much different than standard tungsten, although, grant it, any material heated and cooled will exhibi; /archives//html/TenTec/2006-10/msg00204.html (14,377 bytes)
15. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "John K Gotwals" <john@gotwals.com>; Date: Sun, 8 Oct 2006 21:18:07 -0400; John, N9JG --Original Message-- Date: Sun, 8 Oct 2006 18:42:34 -0400 From: "RB" <K9RB@bellsouth.net> Subject: Re: [TenTec] Centurion Amp Woes To: "'Discussion of Ten-Tec Equipment'" <tentec@contestin; /archives//html/TenTec/2006-10/msg00215.html (9,832 bytes)
16. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sun, 08 Oct 2006 19:50:27 -0600; The thoriated tungsten filament isn't all that much different from the filament in a light bulb except it doesn't get run quite as hot and has thorium mixed in with the tungsten before the filament i; /archives//html/TenTec/2006-10/msg00221.html (14,617 bytes)
17. Re: [TenTec] Centurion Amp Woes (score: 1): Author: "Jason Buchanan" <jsb@digistar.com>; Date: Sun, 8 Oct 2006 22:16:02 -0400; I never turn off a tube if i'm going to use it within the next 3-4 hours. On the other hand the Drake L4 I have has the original Amperex 8163 tubes that came with it and my grandfather used the amp; /archives//html/TenTec/2006-10/msg00224.html (9,220 bytes)

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