I can never remember the wiring diagram for these, so I jotted it down tonight. Thought I might share it with others who may find it useful for these Dynaco and other OPT's with triple 4, 8 and 16 ohm taps.
A simple way to have ONE set of speaker terminals, yet have the convenience of selecting without opening the amp up... especially if you're a DIY speaker enthusiast and have various impedances on hand.
Cheers!