Adriatic posted:The only thing I can think of to note is I think the LW variable action might be on U , making certain acc voltage combos unusable on it; forcing use of one or the other for acc voltages... (might be the TW I'm thinking of though)
I think you are right, and it's both of them. (I just checked the Greenberg Repair and Operating Manual to confirm)
It was suggested to me a long time ago (probably by my dad) that the way to remember this is that any of the controllers with multiple throttle controls had the U as common and any with just a single control had the A as common. I'm not sure if that holds true for every transformer they ever made, but it holds true for some of the most popular ones (LW, KW, TW, V, VW, Z, ZW).
-Dave