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[Amps] VTX-X118 Tetrode mytery tube?

To: <amps@contesting.com>
Subject: [Amps] VTX-X118 Tetrode mytery tube?
From: KL7RA <richkl7ra@gmail.com>
Reply-to: KL7RA <kl7ra@ptialaska.net>
Date: Mon, 4 Apr 2011 04:38:07 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Originally the new AP8410 used the Eimac 4CX1000A tubes but they made a
switch to the VTX-X118. Seem to be a mystery tube, can't find the spec sheet
and never heard of them.

Anyone know anything about this tube? My guess is Alpha used the 4CX1000A
but got them with a higher grid rating?  It looks like this tube number is an 
Alpha
part number to me. 

73 Rich KL7RA   Alpha amp owner 

>From Alpha:
The amplifier uses the Alpha Power brand VTX-X118 tubes, a ceramic, 
external-anode,
 indirectly heated tetrode that, unlike the excellent Eimac 4CX1000A, is 
qualified to handle 
the grid current that might be experienced in the AP8410.
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