Most contest stations choosing Ameritron use the Al-1200. Several reasons but
primarily the 3CX1200A7 is virtually indestructible and instant on so in the
heat of contesting, the owners don't worry about how the guest operators use
them. Except for the tubes, the two amplifiers are virtually identical and have
the same power supply and tank circuits.
The AL-1500 puts out more power with less drive but has that annoying
three minutes plus warm up time.
73, Dennis W0JX
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