Whats in the Inward Connections and the like is an update of the original Op-Amp about the size of an API Op-Amp. His ones in the early Quad Eights (MM61's & 71's) are square and about the same size as an API 2520 or a Jensen 990 also, his electrodyne designs are round.
And I meant to say...the linage goes like this "Electrodyne", Sphere, Quad Eight and some Langevin...
Larry DeVivo
www.silvertonemastering.com/stone