I did a google image search for this and found several iterations of the back.
TADAC tube dac help
Late lamented Paul Gryzbek's "TADAC" tube dac has been sitting in my closet for several years and I'd like to resurrect it for a second system. Problem is the many connections in back are not labeled and I don't remember what goes where. It's a an early iteration with a switching box attached to the bottom. Can anyone help?