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ACM is "Accumatic" used on the solid state sets and some of the tube sets, to set to a pre-set of color, brightness, and contrast, and provide some correction of tint.
Some of the CTC-39's have A/T which is accu-tint, usually a rotary switch in the middle of the control panel, it provides some kind of change in the chroma section to make tint setting less critical...it seems to change the picture to a redder tone.
The Accucolor system was only used on the tube type sets although I am not sure its exact m.o., I don't personally own any sets that are labeled as having it.
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