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61. Re: [TenTec] Hercules 444 amp (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Wed, 13 Aug 2014 17:03:56 +0200; That may be a little too optimistic, Mike. Purchasing matched pairs does not assure they are going to draw equal current throughout their life, but it does improve the chances. I have a hunch if you; /archives//html/TenTec/2014-08/msg00212.html (18,817 bytes)
62. Re: [TenTec] Hercules 444 amp (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 13 Aug 2014 16:13:56 +0100; Or the OP could just buy some spare PA transistors for his 444 !! Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mai; /archives//html/TenTec/2014-08/msg00213.html (9,996 bytes)
63. Re: [TenTec] Hercules 444 amp (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Wed, 13 Aug 2014 17:25:14 +0200; Do you know a source where one can still purchase these, Steve? 73 - Rick, DJ0IP (Nr. Frankfurt am Main) Or the OP could just buy some spare PA transistors for his 444 !! Steve G3TXQ ________________; /archives//html/TenTec/2014-08/msg00214.html (10,687 bytes)
64. Re: [TenTec] Hercules 444 amp (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 13 Aug 2014 16:48:31 +0100; Rick, See my post of 9th August - the 5th in this thread. 73, Steve G3TXQ 73 - Rick, DJ0IP (Nr. Frankfurt am Main) _______________________________________________ TenTec mailing list TenTec@contestin; /archives//html/TenTec/2014-08/msg00216.html (10,221 bytes)
65. Re: [TenTec] Hercules 444 amp (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 13 Aug 2014 17:19:14 +0100; John, I went by the TenTec manual here, which shows them as MRF428s: http://www.qsl.net/tentec/manuals/444.pdf If they are MRF428s, there seem to be some in stock here: http://www.digikey.com/product; /archives//html/TenTec/2014-08/msg00217.html (11,022 bytes)
66. Re: [TenTec] Hercules 444 amp (score: 1): Author: Clayton Brantley via TenTec <tentec@contesting.com>; Date: Wed, 13 Aug 2014 10:11:39 -0700; My manual gives the CD4792-4 as the transistor part number. I'll look again, but that's what is written on the page!. They may be the same transistor, but different numbers. Clayton N4EV John, I; /archives//html/TenTec/2014-08/msg00218.html (11,913 bytes)
67. Re: [TenTec] Hercules 444 amp (score: 1): Author: Mike Schatzberg <cherokeehillfarm@earthlink.net>; Date: Wed, 13 Aug 2014 13:22:07 -0400; The whole world seems to buy matched pairs or quads. There doesn't seem to be a need for this when buying ceramic triodes, although some users at VHF and UHF still try to buy matched pairs. I see tha; /archives//html/TenTec/2014-08/msg00219.html (12,372 bytes)
68. Re: [TenTec] Hercules 444 amp (score: 1): Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>; Date: Wed, 13 Aug 2014 18:40:18 -0500; I've found that glass bottle triodes do benifit, largely due to circuit designs, thus having matched tubes to be a plus in tube longivity. And I agree that using a resistor, a fuse or RF choke betwee; /archives//html/TenTec/2014-08/msg00220.html (13,705 bytes)

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