None of the three different 2-prong Empeg transformers is polarized, so they probably won't care, but it seems like it would be a nice idea to switch the "hot" lead on AC, eh?!?! (Hmmmm, or does it matter? In DC you can switch the ground with the same effect...and you can certainly have both switched in AC. Anybody?)

To number6's microswitch (which I'd seen a long time ago and which certianly seems like a cool idea), I have a question for electrical types: If the transformer is constantly plugged in, but there is no draw on it, how much power does it consume? I had the notion that it would only draw significantly if it was serving a load (the Empeg). If I had a shunt of some sort I guess I could measure that, but I don't.