"Roger Leone" wrote in message
news
Brian:
How much output you get out of the amp does depend on the condition of the
tubes, but you didn't say whether the tubes were grid driven or cathode
driven (grounded grid).
If they are run grounded grid, 4 watts in to get 43 watts out is very
reasonable for a pair of healthy tubes. Depending on plate voltage and
the
bias setup, you could very well drive it to higher output. But keep in
mind
that in AM operation the peak output can be up to 4 times the unmodulated
carrier power, so with 43 watts of carrier output you can be running over
170 watts peak output at 100 percent modulation.
You may be able to drive it with 25 watts of SSB and get close to 250
watts
out. Be sure to get some stations to tune around your signal and let you
know if they hear anything bad.
73,
Roger K6XQ