Actually the 1952 manual that I sent you contains 7 supplements and covers ALL models (AM, AMP, A2MP, A3MP, A4MP, 101P, 102P and the 121P. The A2MP gets no mention in that manual but I think that mainly has to do with the fact that, for all intents and purposes, the A2MP was basically an A3MP which was still installed in an original AMP cabinet.