BHK 250 input stage coupled to a" high bias ....output?

In the BHK 250, the “input stage coupled to a high bias differentially balanced MOSFET output. "
What does” high bias" mean?

It means there’s quite a lot of current running through that output stage at idle, enough to make the BHK 250’s heat sinks run quite hot. It’s not quite the technical definition of Class A but it’s up there.

Thank you Paul.