Okay, lets see if i have this right..

Whoa. Instant graphics! Yes, that looks right. I can't be 100% certain about polarity (black/white) but a) it may not matter to the Empeg DC transformer and b) you can check by following polarity with a multimeter/ohmeter.

Just my neurosis, but I put my switch in the + side of the DC side of the equation -- on the Empeg side of he transformer. I'm happier dealing with Empeg DC +/- for some superstitious reason! Ignore my superstitions as needed!