[Arran]

I'm with Mike on this, though I am not an E.E, like Mike I tend to put the radio back to it's original form, electrically, since I tend to trust that the engineering staff of Philco, RCA, or whomever, knew enough to make certain that the set worked more or less properly when it left the factory. You often end up chasing your tail trying to figure out someone else's work, and why they did something, I've been running into that in communications receivers lately. For a start you don't have a 611 chassis on the bench, it has a power transformer and the 611 is a series string AC/DC set. So I would assume that the set is one of the versions of a 37-610.
https://philcoradio.com/library/download...l.%202.pdf

https://philcoradio.com/library/download...l.%202.pdf

Regards
Arran