02-11-2015, 03:17 PM
Welcom to the Phorum! There's a schematic on Audiophool's Philco page. If you can't get the DJVU file to open let me know and I can post a pdf of it. Looks like the Tone Control is also the On-Off swithch (part #59). Once turned on it appears further turning would adjust the tone by adding in different capacitors. Perhaps someone with a 37-630 can say for certain.
Your best bet for a Philco replacement is to put an ad in the "Wanted Ads" section.
Your best bet for a Philco replacement is to put an ad in the "Wanted Ads" section.