[Arran]

OK. More sad news, the shadowmeter seems open.
I was continuing recapping when seeing a resistor 3K value that is not on the sch....in short it was in parallel to the shadow meter, plus to really crudely fit tubular caps instead of disconnected backelite block. Actually all backelites are like this. And old petrified black tape.
The resistor is classic dogbone so the repair has to be old.

Well.....ok. We have Alabama radio club for that.

Mike
 Fortunately the fellow, whose video you linked to regarding the tone control, has another where he rewinds the coil on the shadow meter, but I seem to think that you rewound one of those before on one of your other sets.
 I never liked the tone controls on Philcos, using a three or four position switch limits your options as opposed to using a pot. On a higher end set like a Philco 16, which were supposed to be HiFi, it comes off as being rather cheap, I can only assume that Philco used these things to get out of paying royalties to the evil RCA or some other firm. I have a lowly Canadian Westinghouse model 527 console from 1937 and it has both a switch and a pot for tone control, I think that the pot is for treble and the switch for bass, and it's a five tube set, the 1936 models had the same.
Regards
Arran