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Re: [TenTec] Titan 425 3CPX800A7 Modification

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Titan 425 3CPX800A7 Modification
From: "Ron Castro" <ronc@sonic.net>
Reply-to: Ron Castro <ronc@sonic.net>, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 5 Dec 2010 20:09:12 -0800
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Yep...that's it!

            Ron  N6IE
       www.N6IE.com

----- Original Message ----- 
From: "Jason Cooper" <jbear45@msn.com>
To: "Ron Castro" <ronc@sonic.net>; "Discussion of Ten-Tec Equipment" 
<tentec@contesting.com>
Sent: Sunday, December 05, 2010 6:28 PM
Subject: [TenTec] Titan 425 3CPX800A7 Modification


>I believe that this is the web page that has that modification.
>
> http://www.hamradiomarket.com/articles/Titan%20P%20Hybrid.htm<http://www.hamradiomarket.com/articles/Titan%20P%20Hybrid.htm>
>
> 73,
> Jason KN7AZ
>  ----- Original Message ----- 
>  From: Ron Castro<mailto:ronc@sonic.net>
>  To: k9yc@arrl.net<mailto:k9yc@arrl.net> ; Discussion of Ten-Tec 
> Equipment<mailto:tentec@contesting.com>
>  Sent: Friday, December 03, 2010 1:26 PM
>  Subject: Re: [TenTec] TITAN 425 PS maintenance
>
>
>  There was an article from a ham in Texas on the internet on modifying the
>  425 for 3CPX800's but I can't find it.  I recall it required an entire 
> new
>  supply, including a custom-built Hypersil transformer from Peter W. Dahl
>  that ran more voltage and current than the original and fit in the power
>  supply cabinet.  With the higher plate voltage, less drive was required, 
> and
>  lower grid current for legal power, but I think the real object was to 
> run
>  much more than legal power.  The author claimed he tested the modified 
> amp
>  at 3.2 kW PEP out..."on a dummy load of course" (yeah, right!).  I guess
>  everything's bigger in Texas!
>
>  Like one Texan told me: "Go big or stay home"....
>
>              Ron  N6IE
>         www.N6IE.com<http://www.n6ie.com/>
>
>  ----- Original Message ----- 
>  From: "Jim Brown" 
> <k9yc@audiosystemsgroup.com<mailto:k9yc@audiosystemsgroup.com>>
>  To: <tentec@contesting.com<mailto:tentec@contesting.com>>
>  Sent: Friday, December 03, 2010 1:04 PM
>  Subject: Re: [TenTec] TITAN 425 PS maintenance
>
>
>  >
>  > One thing you would need to consider is what other high voltage
>  > capacitors are in the RF deck that might need to be replaced with parts
>  > rated for higher voltage.
>  >
>  > As I understand it, the main reason for using higher voltage with 3CPX
>  > tubes is that you can achieve legal power with less plate current. I
>  > don't know if there would be reduced drive requirement, or less grid
>  > current. Since the primary failure mechanism in these tubes is 
> excessive
>  > grid current, that's what I would pay the most attention to.
>  >
>  > Also, I don't know what's in this board, but to get higher voltage, you
>  > would probably have to replace the power transformer as well.
>  >
>  > The only condition under which I would look at this board as a
>  > replacement is if most of the power supply went up in smoke. :)
>  >
>  > 73, Jim K9YC
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>  >
>
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