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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.

1. [TenTec] Hercules 444 amp (score: 1)
Author: dslosty@pipeline.com (dslosty)
Date: Sat, 21 Jul 2001 21:39:28 -0400
I've been looking for a decent Hercules 444 amp to go with my Omni-C for some time. I came across one that didn't work, and the imbalance shutdown light was on. The amp in question probably has one o
/archives//html/TenTec/2001-07/msg00164.html (7,583 bytes)

2. [TenTec] Hercules 444 amp (score: 1)
Author: N4NT@chartertn.net (Mike Hyder -N4NT-)
Date: Sat, 21 Jul 2001 23:15:44 -0400
I owned the last 444 Ten-Tec worked on. It had taken off and burned a couple of the circuit boards. They fixed it and added more negative feedback. I sold it, telling the buyer that Ten-Tec wouldn't
/archives//html/TenTec/2001-07/msg00166.html (8,757 bytes)

3. [TenTec] Hercules 444 amp (score: 1)
Author: "Paul DeWitte K9OT" <k9ot@mhtc.net>
Date: Wed, 21 Dec 2005 19:30:25 -0600
I have a 444 amp that has sat for several years. I Powered it up a few days ago and it shows about 60 volts on the meter, and has the over voltage protection tripped. Has anyone that has or had one o
/archives//html/TenTec/2005-12/msg00580.html (7,525 bytes)

4. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Mike Hyder -N4NT-" <n4nt_m_o_hyder@charter.net>
Date: Wed, 21 Dec 2005 20:55:21 -0500
60 volts is too high. they run at about 48-50 volts. you might check the pass transistors in the power supply. be really careful with that amp as it is not repairable. 73, Mike N4NT I have a 444 amp
/archives//html/TenTec/2005-12/msg00581.html (7,904 bytes)

5. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "ROBERT CARROLL" <w2wg@comcast.net>
Date: Wed, 21 Dec 2005 20:56:52 -0500
I saw a notice a couple of days at TenTec saying that they have declared the Hercules line unrepairable. Too bad as it was a nice amp. I have a 444 amp that has sat for several years. I Powered it up
/archives//html/TenTec/2005-12/msg00582.html (8,553 bytes)

6. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Mike Hyder -N4NT-" <n4nt_m_o_hyder@charter.net>
Date: Wed, 21 Dec 2005 21:06:53 -0500
I had one. It had a temperature controlled fan speed. Sounded like a 727 jet when cool and a 747 in reverse when it got warm. It sure smelled bad when it caught fire. Mike N4NT I saw a notice a coupl
/archives//html/TenTec/2005-12/msg00583.html (9,010 bytes)

7. Re: [TenTec] Hercules 444 amp (score: 1)
Author: w8au@sssnet.com
Date: Wed, 21 Dec 2005 22:28:36 -0500
Larry Worth must have been hiding in his office! :-) Next time ask for Larry... he used to be the Repair Dept manager during that period of time but got promoted. He would bend over backward to help,
/archives//html/TenTec/2005-12/msg00585.html (7,760 bytes)

8. [TenTec] Hercules 444 amp (score: 1)
Author: Clark Savage Turner <csturner@kcbx.net>
Date: Wed, 21 Dec 2005 20:50:39 -0800
Correct me if I'm wrong: - The Hercules 444 amp was declared unrepairable at least 10 years ago due to the inability to obtain the proper replacement final transistors. - The Hercules II is still eas
/archives//html/TenTec/2005-12/msg00590.html (7,745 bytes)

9. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Graham Wright <graham-g4fuj@talk21.com>
Date: Thu, 22 Dec 2005 09:16:11 +0000 (GMT)
I don't have diagrams or info. on these, but surely there must be a nearish equivalent transistor to use in the finals on these, even if some modification is required to driver stage and PSU? 73 Grah
/archives//html/TenTec/2005-12/msg00593.html (8,151 bytes)

10. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Mike Hyder -N4NT-" <n4nt_m_o_hyder@charter.net>
Date: Thu, 22 Dec 2005 07:56:06 -0500
When mine caught fire, they had to fabricate two new boards I believe. The closest transistors they could get to the originals had higher gain and were thus more prone to self-oscillation (the malady
/archives//html/TenTec/2005-12/msg00597.html (9,229 bytes)

11. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Graham Wright <graham-g4fuj@talk21.com>
Date: Thu, 22 Dec 2005 14:15:55 +0000 (GMT)
Hi Mike, Fire? Oh well, perhaps I'll just stick with valves for QRO then. I could do with replacing my Heath SB-200, but have never seen a Titan 425(?) for sale here in UK (yet!). 73 & Seasons Greeti
/archives//html/TenTec/2005-12/msg00600.html (10,800 bytes)

12. Re: [TenTec] Hercules 444 amp (score: 1)
Author: "Mike Hyder -N4NT-" <n4nt_m_o_hyder@charter.net>
Date: Thu, 22 Dec 2005 09:38:31 -0500
Hi, Graham. If you talk with Roy, K6XK ( royanjoy@ncn.net ), he will perhaps tell you how he modified his SB-200 to run class "C". His gets greater efficiency and doing that modification might save y
/archives//html/TenTec/2005-12/msg00602.html (11,522 bytes)

13. [TenTec] Hercules 444 amp (score: 1)
Author: Douglas via TenTec <tentec@contesting.com>
Date: Sat, 9 Aug 2014 00:37:22 -0700
Has anyone figured out a substitute for the final transistors in the original Hercules amp? Also, most replacements have an Hfe that is too high. The amp will oscillate, rapidly blowing the replaceme
/archives//html/TenTec/2014-08/msg00118.html (7,310 bytes)

14. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sat, 09 Aug 2014 05:56:34 -0700
You might ask on the amps reflector. I suspect the answer is still no. I owned one of these amps for a few years and sold it. The original story, as I heard it, is that Motorola learned that the outp
/archives//html/TenTec/2014-08/msg00119.html (7,608 bytes)

15. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Brian Carling <bcarling@cfl.rr.com>
Date: Sat, 9 Aug 2014 10:12:45 -0400
Seems like a lot of RF power transistors are similar, so it should not be too difficult to find a substitute. Best regards - Bry Carling _______________________________________________ TenTec mailing
/archives//html/TenTec/2014-08/msg00120.html (8,290 bytes)

16. Re: [TenTec] Hercules 444 amp (score: 1)
Author: John King via TenTec <tentec@contesting.com>
Date: Sat, 9 Aug 2014 11:09:42 -0700
Subject: Re: [TenTec] Hercules 444 amp To: "k9yc@arrl.net" <k9yc@arrl.net>, "Discussion of Ten-Tec Equipment" <tentec@contesting.com> Date: Saturday, August 9, 2014, 9:12 AM Seems like a lot of RF po
/archives//html/TenTec/2014-08/msg00121.html (9,503 bytes)

17. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Steve Hunt <steve@karinya.net>
Date: Sat, 09 Aug 2014 19:27:55 +0100
Are they MRF428s ? http://www.digikey.com/product-detail/en/MRF428/1465-1187-ND/4429884 Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://li
/archives//html/TenTec/2014-08/msg00122.html (7,169 bytes)

18. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Clayton Brantley via TenTec <tentec@contesting.com>
Date: Sat, 9 Aug 2014 13:48:11 -0700
The transistor is a CTC CD4792-4 and there are 4 of them.  Need to be at least 350 watt units. Clayton N4EV Seems like a lot of RF power transistors are similar, so it should not be too difficult to
/archives//html/TenTec/2014-08/msg00123.html (9,800 bytes)

19. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Douglas via TenTec <tentec@contesting.com>
Date: Sat, 9 Aug 2014 14:24:04 -0700
Date: Sat, 9 Aug 2014 10:12:45 -0400 From: Brian Carling <bcarling@cfl.rr.com> To: "k9yc@arrl.net" <k9yc@arrl.net>,    Discussion of Ten-Tec Equipment     <tentec@contesting.com> Subject: Re: [TenTec
/archives//html/TenTec/2014-08/msg00124.html (9,228 bytes)

20. Re: [TenTec] Hercules 444 amp (score: 1)
Author: Brian Carling <bcarling@cfl.rr.com>
Date: Sat, 9 Aug 2014 17:38:03 -0400
So maybe the Hercules can be converted to use MOSFETs. Seems like it should be possible. I also think MFJ needs some competition on MOSFET linear amplifiers to get the price point within reach of the
/archives//html/TenTec/2014-08/msg00125.html (9,527 bytes)

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