With these tubes in such short supply, it may be necessary to modify the amp
to run different finals. My guess would be a pair of GU74b's, which would
require a bit of metal work in the box, but they run off the same filament
voltage and similar plate voltage. Some photos inside the chassis
(http://www.hamradiomarket.com/Articles/TenTecTitan%20II.htm) suggest that
there might be enough room to squeeze a pair in.
Word is that the GU74b's may be going into short supply soon, too.
Ron Castro
Chief Technical Officer
Results Radio, LLC
N6IE
www.N6IE.com
----- Original Message -----
From: "Duane Calvin" <ac5aa1@gmail.com>
To: <geraldj@storm.weather.net>; "'Discussion of Ten-Tec Equipment'"
<tentec@contesting.com>
Sent: Saturday, May 31, 2008 12:11 PM
Subject: Re: [TenTec] 4CX1600B
>A better search might be Svetlana and GU91B. We all miss Tom Hix, who
> supplied many of these, but the GU91B's were in very short supply when the
> Titan II and the Alpha amp were designed.
>
> 73, Duane
>
> Duane Calvin, AC5AA
> Austin, Texas
> www.ac5aa.com
>
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of Dr. Gerald N. Johnson
> Sent: Saturday, May 31, 2008 2:00 PM
> To: tentec@contesting.com
> Subject: Re: [TenTec] 4CX1600B
>
> On Sat, 2008-05-31 at 10:11 -0700, Michael Zeglen wrote:
>> Does any one know where I might find a replacement tube for the Ten Tec
> Titan II? It is my understanding that the GU-91B will work as a
> replacement.
> I have tried RF Parts, Ten Tec and Penta Labs but NO LUCK. I know someone
> has to have one laying around somewhere.
>>
>> MIKE - KL7ai
>
> google showed:
>
> http://www.sed-usa.com/index.asp?strType=Content&strPage=4CX1600B
>
> http://www.garant-funk.com/svetlana/4CX1600B.html
>
> But this post says it wasn't available in 2003 already.
> http://chat.qth.com/viewtopic.php?
> p=861&highlight=&sid=0f2da7248b3e2bb78455b0104184d8f7
>
> But:
> http://www.tube-shop.com/uk/prod_industrial_detail.asp?
> ProductID=332&ProcessType=20
> says its in stock, in England. Sit down before you check the price and
> shipping in dollars.
>
> Though the price at the US location is a little better:
> http://www.tube-shop.com/usa/prod_industrial_detail.asp?
> ProductID=332&ProcessType=20
>
> http://www.ivaza.cz/cs/files/folders/tubes_data/entry116.aspx says its
> no longer made.
>
> I saw hints that Alpha has also used the tube so there might be a chance
> they have spares.
>
> There may be more to be found, but I just looked at the first 100 of
> 1620 google hits searching for 4CX1600B.
>
> 73, Jerry, K0CQ
>
>
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