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Total 37 documents matching your query.

21. Re: [Amps] Amplifier Fans: (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sat, 25 Aug 2012 21:08:16 -0400
You didn't have to trash it. I had a 5V psu which came with a laptop cooler that was really bad. I could hear it on a dipole over 100 feet from the house. 12 turns of the 5V side around a clamp on fe
/archives//html/Amps/2012-08/msg00426.html (9,781 bytes)

22. [Amps] TenTec Titan 425 Idle Grid Current (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Tue, 25 Sep 2012 20:35:22 -0400
I noticed today on my TenTec Titan 425 that the grid idle current is around 7 or 8mA on the Ig meter. I see this on the amp when I key my TS930S in ssb with no drive. (modulation). I don't recall see
/archives//html/Amps/2012-09/msg00293.html (6,606 bytes)

23. Re: [Amps] Ten-Tec 425 Titan (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Tue, 5 Feb 2013 21:06:42 -0500
Yes I love mine...gold series 425......makes my TL-922 look like a Honda Civic Mark N1UK This model amp is a real winner. I will allow mine to go only after they pry it from my cold, dead fingers. It
/archives//html/Amps/2013-02/msg00050.html (9,004 bytes)

24. [Amps] Ten Tec Titan 425 Fuses Blew (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sat, 16 Feb 2013 22:37:56 -0500
Both the 20 amp fast blow 240v fuses just blew in my Ten Titan 425 this evening while I was keying about 1200 watts on 160m. I am told that I can get Microwave 20 amp fuses from Home Depot. If these
/archives//html/Amps/2013-02/msg00133.html (7,174 bytes)

25. Re: [Amps] Keying Kenwood TL922 with Yaesu FT1000D (both old guys) (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Fri, 18 Oct 2013 23:27:33 -0400
I would key the amp by grounding the amp PTT line. I would measure the keying current and also the amp ptt open circuit voltage and then check the spec on the FT1000D. Then you would know if the FT10
/archives//html/Amps/2013-10/msg00330.html (8,778 bytes)

26. Re: [Amps] solid state relays (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Thu, 4 Sep 2014 22:23:22 -0400
I am using a big 30 amp 240V variac here and it would trip my 30 amp 240V breaker when I powered up the variac on it's own with no load. I had to install a surge limiter on the variac to prevent this
/archives//html/Amps/2014-09/msg00001.html (8,020 bytes)

27. Re: [Amps] Henry 3k Filament transformer taps (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Tue, 23 Sep 2014 14:37:47 -0400
My 240V house supply measured 252V rms. Did you measure yours? Mark N1UK -- Original Message -- From: "Robert Morris" <robrk@nidhog.net> To: "glenn riccio" <gfriccio@hughes.net> Cc: <amps@contesting.
/archives//html/Amps/2014-09/msg00021.html (10,336 bytes)

28. Re: [Amps] titan 425 low output power (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Tue, 05 May 2015 10:28:08 -0400
Yes that is a good thought. My 425 makes about 1kw with 20 watts or so. Mark N1UK 73, Richard hello all, i have a titan 425 that was returned by tentec ( 700 dollar repair bill) with a clean bill of
/archives//html/Amps/2015-05/msg00083.html (9,270 bytes)

29. [Amps] Fwd: Re: titan 425 low output power (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Tue, 05 May 2015 10:29:24 -0400
I would call them and ask them. They were very helpful in walking me through some problems when I repaired my 425 Mark N1UK i use to make 1000 watts with 20 watts worth of drive. REPLY: That is appro
/archives//html/Amps/2015-05/msg00084.html (7,722 bytes)

30. Re: [Amps] Amp Layout (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Thu, 12 Nov 2015 18:28:53 -0500
Excellent work Mark N1UK http://s900.photobucket.com/user/w7ry/library/8877%20Amplifier Beeeooootiful! _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2015-11/msg00081.html (8,052 bytes)

31. Re: [Amps] Titan 425 will not turn on (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Tue, 25 Oct 2016 22:41:14 -0400
I am working on my 425 right now with a similar issue. Here is another schematic http://audiosystemsgroup.com/TitanPS.pdf As you can see there is a interlock on the psu case and another interlock on
/archives//html/Amps/2016-10/msg00123.html (10,684 bytes)

32. Re: [Amps] TenTec 425 Plate Current at Standby (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Sat, 4 Feb 2017 16:07:48 -0500
I have a Tentec 425 as well (Golden Series) and I love this amplifier. I have had this plate current problem twice in the last two years and both times it was a bad Chinese Matchlett tube. I hope it
/archives//html/Amps/2017-02/msg00012.html (9,580 bytes)

33. Re: [Amps] Amplifier lifetime (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Fri, 6 Oct 2017 14:47:10 -0400
DX Engineering make this https://www.dxengineering.com/parts/dxe-tvsu-1b I am using it on my TS930S since it used to cause a hot switching software trip on the Acom 1000. Mark N1UK One method I have
/archives//html/Amps/2017-10/msg00088.html (9,270 bytes)

34. Re: [Amps] TL-922 FAN REPLACEMENT (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Sat, 13 Apr 2019 20:01:09 -0400
Hi Dave, Have a read of this https://www.eham.net/ehamforum/smf/index.php/topic,122601.0.html On Page 1, I give the part number that I used and on Page 3, N0XWR gives more part numbers. 73 Mark N1UK
/archives//html/Amps/2019-04/msg00035.html (9,676 bytes)

35. Re: [Amps] Ten Tec Titan Power Supply (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Mon, 30 Mar 2020 08:46:07 -0400
Hi Jim, I had a similar failure on my Golden 425 a few years ago. I sent you some pics of my repair. 73 Mark N1UK Can you send me a wide view picture of the short please and I'll post it. Thanks 73 J
/archives//html/Amps/2020-03/msg00109.html (10,315 bytes)

36. [Amps] Hercules II With SD 1405 Bias Current Setting (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Mon, 24 Aug 2020 10:49:06 -0400
I have my Hercules II amp on the bench for a repair and I decided to check the power supply voltages and the PA transistor bias settings. The power supplies with the undriven amp keyed was 14.03V,  1
/archives//html/Amps/2020-08/msg00053.html (8,432 bytes)

37. Re: [Amps] Ten Tec Titan 425 (score: 1)
Author: Mark Robinson <markrob@mindspring.com>
Date: Tue, 15 Dec 2020 17:36:52 -0500
On my 425 the input swr has changed dramatically with different Chinese replacement tubes. The original EIMAC's presented a very low swr on all bands. Now with the Chinese replacements I am using a m
/archives//html/Amps/2020-12/msg00027.html (8,718 bytes)

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