The 7 had several designations and added letters to distinguish variations. The most substantial difference in design was the tube/solid state models 7,7c,7p (all tube models) 7t (solid state) There were some used commerically that had a set of rack handles (oem - not after market handles) they were designated 7cr and 7tr. The 7p is the rarest of all.I have only seen one,and I don't know why the p was added,or what the difference was about the design to give it a "P" designation----anyone know more about the 7p?
Olenorge
Olenorge