Cary 805B without bias pot

My 805B monos do not have the bias pot or the aux plug hole to plug in a meter.  I've seen no literature that talks about an autobiasing amp.

The previous owner (and original owner, I think) said the amps were an upgraded autobiasing set of monos.

I've reached out to Cary about this and no response, hence the question here.

I just hear back from Cary about the amps.

Was informed back then the auto-biasing was an option.