Hi
I've recently created a Google-group for the original Cambridge Audio
HiFi.

http://groups.google.com/group/vintage-cambridge-audio

Currently there's the complete P50 Service Manual (80pp) - which
covers all 3 types.
There are also circuit diagrams/manuals/reviews for P50/P60/T55/R50 -
the list is being added to.

Hope this is of some interest to members here.