[Jayce]

Ron,

Radiomuseum.org has an actual picture of a surviving 70 in the cabinet pictured in the gallery. I don't have the link right now, but I found it by doing a Google image search for 'Philco 70 lowboy'.
What got me investigating mine is I noticed two sets of chassis mount holes on the chassis board. I have a 50 cathedral and the board on my 70 is not only drilled for both chassis, but I can make out the faint outlines of the washers used for the mounting bolts on the 50 chassis holes. It almost looks like they mounted a 50 chassis briefly, then went 'Oops! We need that to be a 70!' and suddenly re-drilled the board and put the 70 chassis in instead! I realized this couldn't be a swap done by someone outside the factory, due to the shaft spacing between the 50 and 70 being different. The controls on a 50 are more spread out. Hmmm...