Prior to getting the AC supply for the 19 set I ran it from a pair of 12 batteries using a switch panel much like a C5 charging board. When one battery got down I could switch to a fresh one and the other one was connected to a charger.
I'm not aware of a "base" AC supply for the 52 set. There were other options for base sets like the C43 set.
There are switching supplies available now in fairly high current ratings like:
http://www.durhamradio.com/jetstream...er-supply.html
The problem with using a regulated supply is the inrush current to bring the dynamotor up to speed. The CPP2 is a brute force power supply. It only has rectification and filtering.
Maybe parallel a battery across a 12 supply.