Does anyone know if this runs in Class A up to a certain point? If so, at what point does it switch to Class B?

There’s a booklet online here

https://www.manualslib.com/manual/59...?page=3#manual

but it’s not specially helpful IMO. It says it consumes 70W for 2x50W output into 8 ohms.

I have one of these amps, it’s not especially big and heavy, it runs hot but not very hot.