The AL-1200 uses a 3CX1200A7. Not the Z7. Different tube.
73
Jim W7RY
> -----Original Message-----
> From: vy1ei@arrl.net
> Sent: Tue, 31 Aug 2010 17:36:19 -0700
> To: amps@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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