You don't need to modify the Titan to run the 3CPX800A7. Now if you want
more output, or lower drive with same output, you do need to put more HV on
the anode and can do that. If you are just looking for a more available,
often more available tube, they're plug and play replacements. I have a
Titan and I would not want to push the RF deck to that kind of output. But
that's just me. Some of the gurus here may have more comments.
As a for instance/why not, I have read (can't verify but have read on
reflectors) that as big and heavy duty as the Collins 30S-1 appears, it
really is a 2KW input amp, and some of the components, most notably the
bandswitch, are not made to hold up to the voltage or current of much higher
operation.
73,
Art, K0RO
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Jason Cooper
Sent: Sunday, December 05, 2010 8:28 PM
To: Ron Castro; Discussion of Ten-Tec Equipment
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.ham
radiomarket.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
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com<mailto:TenTec@contesting.com>
>
http://lists.contesting.com/mailman/listinfo/tentec<http://lists.contesting.
com/mailman/listinfo/tentec>
>
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