Hi Bob,
There have been at least three versions of Ten-Tec Titan
amplifiers (or four if you count the darker colored version of the 425,
and I guess there was a "Gold" edition of the 425 too, so perhaps five
versions). To the best of my knowledge all of the 425 editions use a
pair of 3CX800A7. The Titan II 416 uses a single 4CS1600B (according to
the unofficial Ten-Tec site, but I wonder if that should be 4CX1600B)
and the Titan III (model number?) uses a pair of 4CX800A, so easy to
make a mistake. The only one I know much about is the 425, 'cause I own
one. I really like it too.
Aside from the different color schemes, there are a few variations
of power supplies and the functions of one of the switches on the front
panel of the 425. My power supply has an HV high/low switch and a fan
speed high/low switch. Not all have both of those, and perhaps some have
neither. I believe there is a version with the HV high/low switch on the
front panel of the amplifier, instead of the QSK/ PTT/VOX switch mine
has there. I suspect it is important not to get power supplies and 425
amplifiers separated, if you have more than one version, unless Ten-Tec
made the wiring of the interconnecting cable compatible with any
combination of amplifiers and power supplies.
DE N6KB
Bob McGraw - K4TAX wrote:
Sorry folks, I quoted data from the Titan III which uses 4CX800A tetrode
tubes and not 3CX800A7 triode tubes. The latter was used in the earlier
version of the Titan amps. My manual is for the Titan III. Ken is correct,
there is no screen grid in the 3CX800A7 tubes nor is there a screen supply.
In either case, the Titan will "generate lotsa' watts".
73
Bob, K4TAX
----- Original Message -----
From: "Ken Brown" <ken.d.brown@hawaiiantel.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Thursday, January 17, 2008 10:04 PM
Subject: Re: [TenTec] 425 titan
Hi Bob,
The Titan 425 uses a pair of 3CX800A7 triodes. Your advice to watch the
(control) grid current is good. There is no screen grid.
DE N6KB
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
----- Original Message -----
From: <W1dxh@aol.com>
To: <tentec@contesting.com>
Sent: Thursday, January 17, 2008 4:12 PM
Subject: [TenTec] 425 titan
hello to all,
i am a newbie to rtty and was wondering if anyone has
used the 425 titan on rtty? at what power did you run it at, and is
there
any
thing i should know before hand. thanks any info appreciated. don't
want
to
smoke anything hi hi.
73's,
steve w1dxh
**************Start the year off right. Easy ways to stay in shape.
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
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