Scott,
Any information on the number of "E" models produced? Were they "special"
runs or just a few units in a regular run? (I have S/N 425-00516 with "TITAN
425E... Not for Domestic Sale" painted on rear panel)
Best regards,
Gary - AB9M
CSM(r) G.L.Huber
9679 Heron Bay Road
Bloomington, Illinois 61704
(309)662-0604
www.csm-gh.com
csm-gh@www.csm-gh.com
gary.huber@us.army.mil
ab9m@arrl.net
www.csm-gh.com/mytrike.htm
www.csm-gh.com/75thRepoDepo.htm
----- Original Message -----
From: "Ten-Tec Inc. Amateur Radio Sales" <sales@tentec.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, January 18, 2008 11:25 AM
Subject: Re: [TenTec] 425 titan
> Bob -- I think you're quoting the specifications from the Titan II or
> Titan III.
>
> The Titan 425 is rated at 1000 watts continuous -- no time limit.
> Running RTTY with that amplifier at 1500 watts in usual digital mode
> duty cycle will not present a problem. The maximum power output for CW
> and SSB was well over 2000 watts -- it was designed with lots of
> headroom. The pair of 3CX800A's is rated 120 mA maximum grid current;
> 1500 watts out into a good load should run the amp in the 30-40 mA
> range, typically.
>
> There were 3 Amateur Radio versions of the Titan 425. The easy way to
> tell them apart: the first had a dark case like the original Corsair,
> mid-1980's. The second was a grey case, Corsair II-style knobs and says
> TITAN 425 on the front panel. Serial numbered up to 425-01000. Roughly
> 1986 to 1989. Third version has the rubberized knobs like the modern HF
> rigs, says TITAN on the front, serial numbers after 425-01000 and then
> date encoded serial numbers which we started using in 1989. There
> technically was a fourth version -- the "Titan Gold" series, which were
> the last 50 units built of the Titan. They had a gold plate on the
> front and a gold plastic logo. They are the same as the third version
> except they were the very last ones we sold when we announced we were
> cutting it off and doing one final production run in 1996-97.
>
> For the technical differences between the amps, I'd refer to the service
> department. I don't know them off the top of my head.
>
> There was also a military version of the Titan called the Titan 425D.
> Different power supply -- rack mount unit. More broadbanded coverage
> than the ham bands version, the front panel bandswitch labeling is not
> 15-20-40 etc. for the ham bands, but was labeled with frequency
> information like 3.3-5.7 MHz, etc. Required less drive power than the
> 425. Front panel, rear panel, and power supply also say Titan 425D.
> Interestingly enough, 15 years or so out of production not many of these
> have turned up for ham radio use. One can only wonder where they all
> are now.
>
> I bought a used 1989 vintage second version Titan 425 in 2001 and it has
> been run up to 20 contests a year since that time. Great amp.
>
> 73
> Scott Robbins
> W4PA
>
> Bob McGraw - K4TAX wrote:
> > For RTTY it is rated 1000 watts output for 10 minutes of transmit time
> > with
> > a 50% duty cycle. i.e. 10 minutes transmit, followed by 10 minutes of
> > receive. Follow the TUNE UP procedure in the manual and do not over
> > drive
> > the amp. Pay very close attention to Screen current and grid current.
> > Be
> > sure the load/antenna is near 50 ohms i.e. SWR <1.5:1 before starting to
> > tune the amp. Start with 10 watts of drive from the exciter.
> >
> > While it is well protected, overdrive can make for expensive and sudden
> > tube replacement needs.
> >
> > And, if you don't have a manual, order one from Tentec.
> >
> > 73
> > Bob, K4TAX
> >
> _______________________________________________
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> TenTec@contesting.com
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>
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