[AMPS] Tube rating question

[Vic Rosenthal]

Eimac's data sheet says that the 3CX800A7 has a plate dissipation of 800 watts. 
But then they say that it '...will deliver 750 watts PEP and 750 watts keydown
CW output to 350 mHz'.

I don't think they're talking about class A, are they?  If an amplifier were 65%
efficient, I would expect to be able to get around 1200 watts from this much
plate disssipation.  What am I missing here?

73,
Vic, K2VCO
Fresno CA

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