Transcendent T16 OTL amp - bias question (& general tips)

So my buddy brings his over yesterday. Enjoying on my Tannoy Cheviot, sweet match. Letting me use for a spell.

Question for other owners: how to check / set the bias? He may have manual but he's not sure. He has 10 or so amps.  

Other tips? Experiences? My 1st ever OTL experience. So far so good.