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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TenTec\]\s+Hercules\s+444\s+amp\s*$/: 68 ]

Total 68 documents matching your query.

41. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Duane Calvin" <ac5aa1@gmail.com>
Date: Sun, 10 Aug 2014 20:51:08 -0500
Sure, Carter. My Centurion came new with two RF Parts 3-500ZG's. This was fairly early in the life of this tube configuration (graphite anode variety) and manufacturer, and TT had just started advert
/archives//html/TenTec/2014-08/msg00149.html (11,838 bytes)

42. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Robert <rmcgraw@blomand.net>
Date: Sun, 10 Aug 2014 22:38:54 -0400
Best experience and best advice is to ways tune the amp for max output while keeping drive and loading such that maximum recommended plate current and maximum recommended grid current are not exceede
/archives//html/TenTec/2014-08/msg00150.html (14,283 bytes)

43. Re: [TenTec] Hercules 444 amp (score: 1)
Author: George Fritkin via TenTec <tentec@contesting.com>
Date: Sun, 10 Aug 2014 22:41:27 -0700
A couple of years ago I decided to replace the Eimacs in my SB220 after all they were the original tubes. I carefully measured power out. We were going to San Diego so on the way I picked up a new pa
/archives//html/TenTec/2014-08/msg00151.html (13,516 bytes)

44. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
Date: Mon, 11 Aug 2014 08:25:14 +0200
RF Parts carries (or rather carried) a wide variety of selection of 3-500 tubes, including their own brand. Over the years they had to drop most of the sources because they ceased production. They al
/archives//html/TenTec/2014-08/msg00152.html (10,253 bytes)

45. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Mon, 11 Aug 2014 00:01:07 -0700
K9YC's third law -- if it ain't broke, don't fix it. 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinf
/archives//html/TenTec/2014-08/msg00153.html (9,807 bytes)

46. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Duane Calvin <ac5aa1@gmail.com>
Date: Mon, 11 Aug 2014 06:32:54 -0500
I don't think we're talking power out, but rather long-term reliability. At the time I had the two pairs of RF Parts 3-500ZG's they were touting how they had the factory running to meet their manufac
/archives//html/TenTec/2014-08/msg00156.html (14,936 bytes)

47. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Paul Gentry <phgentry@gmail.com>
Date: Mon, 11 Aug 2014 07:39:08 -0400
If you have plenty of time and like to build, you can put an amp together from sources such as Communications Concepts (CCI <http://www.communication-concepts.com/index.php/amplifiers.html>). The bas
/archives//html/TenTec/2014-08/msg00157.html (11,823 bytes)

48. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
Date: Mon, 11 Aug 2014 14:07:15 +0200
Duane, even if things were in best order, all products from all companies still have occasional premature failures and somebody is always the proud owner. Perhaps you just had bad luck, unless you he
/archives//html/TenTec/2014-08/msg00158.html (15,547 bytes)

49. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Duane Calvin" <ac5aa1@gmail.com>
Date: Mon, 11 Aug 2014 12:23:42 -0500
I did - that's why I mentioned that there seemed to ba a rash of failures around the same time with the RF Parts 3-500ZG's. They were currently advertising to indicate they were "better" than the Tay
/archives//html/TenTec/2014-08/msg00160.html (17,129 bytes)

50. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Wade Staggs <tvman1954@gmail.com>
Date: Mon, 11 Aug 2014 14:52:18 -0500
*Ten Tec Ten Tec Ten Tec..... Now that we have the Ten Tec part done, I don't own a Ten Tec Amplifier. Sure wish I did! My close friend purchased a MP of 3-500ZG tubes from RF Parts about 9 months ag
/archives//html/TenTec/2014-08/msg00161.html (20,193 bytes)

51. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Carter <k8vt@ameritech.net>
Date: Mon, 11 Aug 2014 18:40:03 -0400
Duane, Thanks for the response... The bad news is what you say is (or was at the time) true. The really bad news is that there seems to be no other choice (other than getting lucky at the e-place). :
/archives//html/TenTec/2014-08/msg00162.html (10,108 bytes)

52. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Date: Mon, 11 Aug 2014 19:00:44 -0500
Based on typical usage of 3 hrs per day for 5 days per week this is 15 hrs per week. The in 52 weeks this is 780 hours per year. With a tube expected life of 20,000 hours, that equates to some 26 yea
/archives//html/TenTec/2014-08/msg00164.html (14,823 bytes)

53. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Al Gulseth <wb5jnc@centurytel.net>
Date: Mon, 11 Aug 2014 19:07:42 -0500
Duane (or any of the other "Wizards of the 3-500Z"), What was the manufacture date or other identifying info on the tubes in question? As you may recall, I recently asked for advice on checking out a
/archives//html/TenTec/2014-08/msg00165.html (19,222 bytes)

54. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "R. Eric Sluder via TenTec" <tentec@contesting.com>
Date: Mon, 11 Aug 2014 20:08:57 -0400
I guess that means my tubes should last much longer... I only wish I could operate 3 hours a day!! Of course someone has to contribute to the Social Security and Medicare plans. :-( Good info Bob. 73
/archives//html/TenTec/2014-08/msg00166.html (16,862 bytes)

55. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Date: Mon, 11 Aug 2014 19:13:35 -0500
The last pair of 3-500's I purchased from R F Parts were of Russian origin as I recall. I purchased their Matched Pair brand because of their 2 year warranty as opposed to the other brand which had a
/archives//html/TenTec/2014-08/msg00167.html (11,913 bytes)

56. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Duane Calvin" <ac5aa1@gmail.com>
Date: Mon, 11 Aug 2014 19:17:59 -0500
Who knows, Al? I have the failed 3-500ZG here in the shack - keep thinking I'll make a table lamp out of it, ha! The only indication on it is a "QC" stamp of some sort on the phenolic base that has a
/archives//html/TenTec/2014-08/msg00168.html (20,682 bytes)

57. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
Date: Tue, 12 Aug 2014 18:56:14 -0500
The issue I've observed with amps using 2 tubes in parallel, there is typically no way to determine what each tube is doing. One needs to be able to determine, at least, the individual grid currents.
/archives//html/TenTec/2014-08/msg00187.html (12,536 bytes)

58. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>
Date: Tue, 12 Aug 2014 21:06:27 -0400
There are control boards available to trip out at adjustable levels of grid current. If you want to monitor each tube individually, you could switch which triode you are monitoring, or install a seco
/archives//html/TenTec/2014-08/msg00191.html (13,633 bytes)

59. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
Date: Wed, 13 Aug 2014 09:08:16 +0200
Grid current is indeed of major importance. I have a question and possible suggestion, but first let me explain why: We had some dodgy rules here in DL 30+ years ago. We were only allowed to run 150w
/archives//html/TenTec/2014-08/msg00199.html (15,267 bytes)

60. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>
Date: Wed, 13 Aug 2014 09:01:26 -0400
The matching of the tubes when purchased assures they will draw approximately the same grid current in the amp. Proper biasing will help assure the cleanest signal for the selected class of service.
/archives//html/TenTec/2014-08/msg00204.html (17,646 bytes)

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