These amps would damn sure do it.
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Those tubes take SEVENTY WATTS each to just light the heaters (14.1 amps at 5V), and the plates are rated at TWO HUNDRED FIFTY WATTS dissipation.
So- those would put out like 320 watts per EACH output tube, or 640 watts heat, for a pair, at full output. Then there's two EL34s that are used as drivers (another 30 watts or so each heat), and the heat from all those mercury rectifiers. Probably close to 800 watts heat from each amp, at full tilt.
Regards,
Gordon.