[TenTec] 425 titan

[Bob McGraw - K4TAX]

Scott & Company:

Yes, my manual is the Titan III.  I've done a couple of repair jobs for some 
folks thus the reason for the manual.

I stand corrected and I understand the difference between the Titan 417 and 
Titan III 425.

Sorry for the confusion and incorrect information.

73
Bob, K4TAX


----- 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
>>
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