[Amps] Question about SPE 1.3K-FA amplifier

[Steve Thompson]

Varying bias can optimise IMD at low and medium power levels but 
once you hit saturated output, I think it has relatively little 
effect.

Steve

 >And I would love to know whether they just use plain simple 
 >class AB and allow the IMD to shoot through the roof at 
 >1300-1500W saturated output, or if they use a clever biasing 
 >scheme that keeps the IMD somewhat under control even when the 
 >FET is driven into saturation.