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@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
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
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