I have BC-500 iron in my GPT-750 mod deck.
As I recall that 807 driver (4, IIRC) runs 'em in Class A(!). In any event, the fellow that built my mod deck used the BC-500 design for the driver - the modulator uses 813s with 807s driving 'em. Don't recall if there's an interstage tranny or not. So short answer is "maybe"