Buying new or used?
From perusing the Ameritron Yahoo Group I believe they have switched from the 3CX1200A7 to the 3CX1200Z7/YU-181 for the AL-1200.
The Z7 bolts straight to the chassis and doesn't require neutralization.
Filament V goes from 7.5 to 6.3 @ 25A so it's not a drop in swap.
The 1200 gets used a lot in contest stations because it's just about bullet proof.
It's too bad that Svetlana quit making the 4CX1600B.
It was one hell of a tube from what I've read. I might go for the used T2 if it were in good shape and the spare tube was good.
I'd be surprised if TT would work on it if you had a major problem.
Depends on the price.
I would stay away from anything with a 3CX800A7 in it like the Command.
To retube that amp with new tubes is $1800.
Centurion at the bottom of the list.
Power supply isn't stout enough to drive the 3-500's. That's why TT rates it at 1300W and not 1500.
Member ARRL, SKCC #215, NAQCC #3441, FISTS #11993