[Amps] 3CX1200Z7 backup tube?

[Carl]

I believe some were built with the Z7 as the A7 was initially very unstable 
in that amp and the Z had a direct to chassis grid flange. Then the Z7 
pretty much went away at Eimac. Different filament voltages also.

Carl
KM1H


----- Original Message ----- 
From: "Jim W7RY" <w7ry at inbox.com>
To: "Eric Irvine" <vy1ei at arrl.net>; <amps at contesting.com>
Sent: Tuesday, August 31, 2010 8:46 PM
Subject: Re: [Amps] 3CX1200Z7 backup tube?


> The AL-1200 uses a 3CX1200A7. Not the Z7. Different tube.
>
> 73
> Jim W7RY
>
>
>> -----Original Message----- 
>> From: vy1ei at arrl.net
>> Sent: Tue, 31 Aug 2010 17:36:19 -0700
>> To: amps at contesting.com
>> Subject: [Amps] 3CX1200Z7 backup tube?
>>
>> I just acquired an Ameritron AL-1200 for HF contesting, and am
>> considering
>> acquiring a backup 3CX1200Z7 tube. I understand that tubes can degrade if
>> unused for several years -- should that be a concern with this tube?
>> It'll
>> be a pain to swap out tubes every few months to keep the backup tube in
>> shape. With the quality of this tube I'm expecting it won't need
>> replacing
>> for quite some time but its my inclination to get a backup.
>>
>> Eric
>> VY1EI
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