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21. Re: [TenTec] Hercules 444 amp (score: 1): Author: Jim Brown <k9yc@audiosystemsgroup.com>; Date: Sat, 09 Aug 2014 22:25:25 -0700; What causes you to say that? Have you designed and built solid state RF power amps? Have you studied the design of RF power amps? Theoretically, ANYTHING is POSSIBLE, but what is PRACTICAL? Do substi; /archives//html/TenTec/2014-08/msg00127.html (8,895 bytes)
22. Re: [TenTec] Hercules 444 amp (score: 1): Author: Robert <rmcgraw@blomand.net>; Date: Sun, 10 Aug 2014 13:01:29 -0400; Many to most design parameters do change radically when converting from BIPOLAR to MOSFET devices. I seen to think MFJ does have their products in the reach of the average ham. I find typically they; /archives//html/TenTec/2014-08/msg00130.html (11,824 bytes)
23. Re: [TenTec] Hercules 444 amp (score: 1): Author: Brian Carling <bcarling@cfl.rr.com>; Date: Sun, 10 Aug 2014 13:27:38 -0400; How much would the parts cost in their higher power MOSFET amplifier? I am guessing a fraction if the $3500 price tag it hits by the time you add QSK, 10m etc. I am simply saying that that is beyond; /archives//html/TenTec/2014-08/msg00131.html (13,137 bytes)
24. Re: [TenTec] Hercules 444 amp (score: 1): Author: Wade Staggs <tvman1954@gmail.com>; Date: Sun, 10 Aug 2014 12:54:03 -0500; *At least for now, even if we could afford one of the Big Gun Solid State Amps. I would hope that we would have the good sense to stick with an Amp which runs 1 or 2 of the 3-500ZG Triodes. They are; /archives//html/TenTec/2014-08/msg00132.html (13,127 bytes)
25. Re: [TenTec] Hercules 444 amp (score: 1): Author: "Duane Calvin" <ac5aa1@gmail.com>; Date: Sun, 10 Aug 2014 13:08:17 -0500; This was certainly true of the EIMAC tubes, as long as you cared well for them. I've not had as good a luck with the current Chinese-sourced tubes (specifically, the 3-500ZG's from RF Parts, which th; /archives//html/TenTec/2014-08/msg00133.html (14,327 bytes)
26. Re: [TenTec] Hercules 444 amp (score: 1): Author: Robert <rmcgraw@blomand.net>; Date: Sun, 10 Aug 2014 14:12:28 -0400; In the case where an amp uses 2 tubes, do replace both if there is a failure. And I spend the extra $$ for the matched pair or quad as the case may be. 73 Bob K4TAX Sent from my iPhone ______________; /archives//html/TenTec/2014-08/msg00134.html (15,483 bytes)
27. Re: [TenTec] Hercules 444 amp (score: 1): Author: "Martin Sole (HS0ZED)" <martin@hs0zed.com>; Date: Sun, 10 Aug 2014 22:50:54 +0300; Hmm, So where do all these dead Hercules end up? I think I'd like one, all sorts of ideas. _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.conte; /archives//html/TenTec/2014-08/msg00135.html (8,230 bytes)
28. Re: [TenTec] Hercules 444 amp (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Sun, 10 Aug 2014 22:11:30 +0200; I support your opinion, Wade. My old AL-80A is only 28 years old, but has been used HARD in at least 20 or 30 big 48 hour contests. When I wasn't using it, it was loaned out to others who were. It is; /archives//html/TenTec/2014-08/msg00136.html (14,642 bytes)
29. Re: [TenTec] Hercules 444 amp (score: 1): Author: "R. Eric Sluder via TenTec" <tentec@contesting.com>; Date: Sun, 10 Aug 2014 16:19:01 -0400; I thought hard about buying a transistor amp, but went with a used al-80a serial #60 and it's been rode hard and is only on its second tube in its lifespan. I believe I saw where it was built in 1986; /archives//html/TenTec/2014-08/msg00137.html (16,240 bytes)
30. Re: [TenTec] Hercules 444 amp (score: 1): Author: Jim Brown <k9yc@audiosystemsgroup.com>; Date: Sun, 10 Aug 2014 13:20:17 -0700; It's AWFULLY hard to beat a used Ten Tec Titan 425. All generic parts, including discrete semiconductors, pretty easy to work on, a really good, but also pretty basic design. The 3CX800A7s last a LON; /archives//html/TenTec/2014-08/msg00138.html (9,191 bytes)
31. Re: [TenTec] Hercules 444 amp (score: 1): Author: Brian Carling <bcarling@cfl.rr.com>; Date: Sun, 10 Aug 2014 17:45:22 -0400; Nice. I love my 422 Centurion and the prices are right for a used KW-out linear with QSK! Good ole Tentec. Best regards - Bry Carling _______________________________________________ TenTec mailing li; /archives//html/TenTec/2014-08/msg00139.html (9,944 bytes)
32. Re: [TenTec] Hercules 444 amp (score: 1): Author: Brian Carling <bcarling@cfl.rr.com>; Date: Sun, 10 Aug 2014 17:47:53 -0400; Yes Eric. They are a bargain. I see lots of used AL80 amplifiers at hamfests for around $700 - 850 depending on condition and the mood of the seller. They look good. Of course two 3-500z tubes will b; /archives//html/TenTec/2014-08/msg00140.html (11,730 bytes)
33. Re: [TenTec] Hercules 444 amp (score: 1): Author: Brian Carling <bcarling@cfl.rr.com>; Date: Sun, 10 Aug 2014 18:08:12 -0400; Are there other sources for 3-500Z tubes? Such as NOS Eimacs? Or broadcast pulls? Best regards - Bry Carling _______________________________________________ TenTec mailing list TenTec@contesting.com; /archives//html/TenTec/2014-08/msg00141.html (16,610 bytes)
34. Re: [TenTec] Hercules 444 amp (score: 1): Author: Brian Carling <bcarling@cfl.rr.com>; Date: Sun, 10 Aug 2014 18:11:15 -0400; I have heard only ONE MFJ $2895 MOSFET amp on the air which leads me to think the "average ham" is going for something else. Best regards - Bry Carling _______________________________________________; /archives//html/TenTec/2014-08/msg00142.html (12,817 bytes)
35. Re: [TenTec] Hercules 444 amp (score: 1): Author: Robert <rmcgraw@blomand.net>; Date: Sun, 10 Aug 2014 18:27:35 -0400; Please don't use used or pulls for a 2 tube amp. The way they're designed one tube may be drawing 60 Ma grid current and the other 200 ma. Yet a total of 260 ma would be normal. Grid to filament is t; /archives//html/TenTec/2014-08/msg00143.html (17,889 bytes)
36. Re: [TenTec] Hercules 444 amp (score: 1): Author: Jim Brown <k9yc@audiosystemsgroup.com>; Date: Sun, 10 Aug 2014 15:40:57 -0700; I'm using both used tubes and pulls pretty successfully. It's easy to run a Titan on a single tube at a fixed drive level that gives you 700W for the first tube you test, note the grid current, and c; /archives//html/TenTec/2014-08/msg00144.html (9,873 bytes)
37. Re: [TenTec] Hercules 444 amp (score: 1): Author: Brian Carling <bcarling@cfl.rr.com>; Date: Sun, 10 Aug 2014 18:57:18 -0400; Good tip. Thanks Bob. Best regards - Bry Carling AF4K _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec; /archives//html/TenTec/2014-08/msg00145.html (11,772 bytes)
38. Re: [TenTec] Hercules 444 amp (score: 1): Author: Robert <rmcgraw@blomand.net>; Date: Sun, 10 Aug 2014 19:04:44 -0400; This is a Very good way to determine the condition of a tube. Just be sure one knows the expected results. If they don't match within 10% or so, I'd have 2nd thoughts as to using them as a pair. 73 B; /archives//html/TenTec/2014-08/msg00146.html (10,928 bytes)
39. Re: [TenTec] Hercules 444 amp (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 10 Aug 2014 18:08:12 -0500; My AL-80A is S/N 095, purchased 1 Jan 1986. It has the QSK-5 installed and, before that, had the older PIN-5 QSK switch, that finally bit the dust. I've modified the PS to be a FW bridge at 4 kV B+ s; /archives//html/TenTec/2014-08/msg00147.html (17,560 bytes)
40. Re: [TenTec] Hercules 444 amp (score: 1): Author: Carter <k8vt@ameritech.net>; Date: Sun, 10 Aug 2014 21:32:34 -0400; My Centurion (which I obtained used 20 years ago) finally had one of its tubes [rather spectacularly] go to the great beyond. Unless I get really lucky and find a NOS pair at the e-place, it seems li; /archives//html/TenTec/2014-08/msg00148.html (10,424 bytes)

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