How to bridge a Pathos Classic One

On the MkII the switch is accessed via a small rectangular slot found on the bottom plate between the tube sockets. On the original the switch is located at the same place, however the bottom plate needs to be removed as it lacks the slot. According to the original owners manual this must be done by a service tech. I believe, with care one could accomplish the task themselves. 

Lucky for me I own the MKII. If I wanted to rum a pair as mono amps I would want the pair to be of the same edition as sonic improvements have been made, in particular between the original and the MKII.

Did you figure this out?  I only have one of these amplifiers but am curious about how the volume would be controlled with a pair of them bridged. 

I have always used my Pathi as mono blocks.  There was a switch my dealer flipped to do it. The Manuel clearly tells you what to do.  When you turn the integrateds on you have to set the volume for each one. Just stand in the middle and use one of the supplied remotes to set the volume.