[TenTec] 425 titan

Tue Jan 22 12:47:16 EST 2008

Thanks Scott, yes the Titan 425 is a great AMP! And the QSK has been great 
for getting thru the pile-ups of many a DX-pedition.

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 at www.csm-gh.com
gary.huber at us.army.mil
ab9m at arrl.net
www.csm-gh.com/mytrike.htm
www.csm-gh.com/75thRepoDepo.htm

----- Original Message ----- 
From: "Ten-Tec Inc. Amateur Radio Sales" <sales at tentec.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, January 21, 2008 8:59 AM
Subject: Re: [TenTec] 425 titan

> They would have been built right alongside the 425's on the production
> line -- I doubt we kept records of the 425 vs. 425E produced as the
> serial numbers were all from the same runs of amplifiers.  Typically we
> would build however many amps we were going to run, and then modify a
> few of them to be the "E" model ready for export orders as needed by
> using the different rear panel.  They are the same amp as the 425, just
> were factory built with 28 MHz enabled.
>
> Scott Robbins
> W4PA
>
> GARY HUBER wrote:
> > 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 at www.csm-gh.com
> > gary.huber at us.army.mil
> > ab9m at arrl.net
> > www.csm-gh.com/mytrike.htm
> > www.csm-gh.com/75thRepoDepo.htm
> >
> >
> > ----- Original Message ----- 
> > From: "Ten-Tec Inc. Amateur Radio Sales" <sales at tentec.com>
> > To: "Discussion of Ten-Tec Equipment" <tentec at 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
> >>>
> >> _______________________________________________
> >> TenTec mailing list
> >> TenTec at contesting.com
> >> http://lists.contesting.com/mailman/listinfo/tentec
> >>
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> >
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