[Ovila Joseph]

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.  

Hi Bob.

Could you please post the PDF? That file won't open for me.

Thank you
Joe