Thanks - I must admit this is quite a nice looking place. So many forums seem to suffer from aesthetics issues. This one seems quite well laid out. I also see Mr C and Mr Dunn are here too - I may have to pop back and have a chat with them from time to time.

The power amp's not new, whereas the P50 is only a few days old. One observation is that the amp seems to like to work fairly hard. Maybe this is down to the passive pre offering less resistance to the incoming signal at higher volume setting? I'm only guessing here of course.
I've still got my P50 that I bought from Richard some time back, and one of the main things I have found with it is that it adds absolutely nothing to the signal at all whatsoever. So yes - the A60 really is having to do all the work and maybe the fact that it is being worked hard is what is bringing the best out of it.

Interestingly, and you may already be aware of this from elsewhere, I brought my P50 to a bake-off about 6 months ago where, to the surprise of all present, it seemed to work exceptionally well with the host's monobloc digital amps.