Interesting! I read the article link above and it seems Mr. Marantz was much like Edison, Ford, JBL; the entrepreneurs of that era who were visionaries and leaders if not highly educated. Hired grads to bring their ideas to fruition. Sounds like he married a terrific gal; math whiz who actually cranked out the math for early circuitry! Curious - does your 7C have any notation as a 7C? What I recall is that the cabinet was optional and could be ordered and some folks constructed their own. Mine is marked Model 7 on the rear, lower left panel and came w/o cabinet. The front panel simple states, "Marantz Stereo Console"