[Amps] 3CX1200Z7 backup tube?

[Carl]

Both tubes use the same socket as does also the D7, so that means nothing; 
the filament voltages are different.

Id rather have the Z7 version anyway at least until it needs replacing. The 
tube was a result of Ameritrons urging and announced by Eimac in 91 as the 
YU-181. Apparently they couldnt generate any other interest and it quickly 
faded away. Ameritron eventually moved some parts around to get the A7 
somewhat neutralized. Im sure there are still several of the early AL-1200's 
out there which probably explains an occassional sudden tube failure report.

Carl
KM1H



----- Original Message ----- 
From: "Eric Irvine" <vy1ei at arrl.net>
To: <amps at contesting.com>
Sent: Tuesday, August 31, 2010 11:50 PM
Subject: Re: [Amps] 3CX1200Z7 backup tube?


> Actually this AL-1200 from HRO came with the 3CX1200Z7, although the add
> indicated it was the 3CX1200A7 and the receipt had same info. The tube 
> went
> into the socket fine so the amp was designed for the Z7. No complaints --  
> I
> understands it a more rugged tube
>
> First time using a 220V amp. Big improvement over a 115 volt amp. Runs
> SMOOTH.
>
> Eric
> VY1EI
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