[Amps] AL-1200 3CX1200Z7 Tube

[Carl]

Im amazed that they got Eimac to run that tube again...bet its a bit pricey. 
I believe the A7 is used in other non ham products; if so it will remain 
available for awhile.

Maybe the Chinese will make a Z7 copy.....

Carl
KM1H


----- Original Message ----- 
From: "Dennis W0JX" <w0jx at yahoo.com>
To: <amps at contesting.com>
Sent: Thursday, September 02, 2010 9:08 PM
Subject: [Amps] AL-1200 3CX1200Z7 Tube


> The AL-1200 is now supplied with the 3CX1200Z7. The change was made in 
> early May and Ameritron had the amp with new tube on display at Dayton 
> this year. There are several circuit changes, mainly a different filament 
> transformer, different chimney, no socket, and the neutralization circuit 
> has been removed because it is no longer necessary.
>
> There is an interesting sidelight to this change. The catalog at Dayton 
> advertised the AL-1200 with a 3CX1200D7. The engineers told me that they 
> ordered a bunch of these tubes from Eimac but could not make them work 
> properly in the AL-1200 chassis. Fifty D7's were sent back to Eimac and 
> the switch was made to the 3CX1200Z7.
>
> This should serve as a warning to AL-1200 users with the A7 tube. That 
> version is going to become "unobtainium."
>
> 73, Dennis W0JX
>
>
>
>
>
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