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Yes it is a non-polarized electrolytic capacitor. Non-polarized or simply AC electrolytic....same thing. Old school says AC like an AC motor run cap etc. Just to distinguis from a normal polarized type.





IIRC he should be OK if the box has a Brake release switch. I believe that all the units using that type control box were compatible with the Ham 4 type rotators. The smaller TR-44 series was definitely different.