[Ron Ramirez]

Hi Jon

The serial number was stamped into the metal chassis in two places: one, underneath the tuning condenser; and two, on the rear of the chassis pan to the left of the speaker socket.

The number should be higher than 237001. It was around July of 1931 that Philco changed the Model 90 from using two 45 output tubes to a single 47 output tube. That date under your cabinet would be AUG 26 1931.

I assisted Ron Boucher in a serial number survey of 1931 Philcos several years ago. Chuck now has the story on his website:

http://www.philcorepairbench.com/cathedralid.htm

I now have a 90 cathedral that was rescued from the trash! A kind fellow emailed me, told me about it, and said I could have it, free. I paid for the shipping, of course. It needs new veneer on the front arch, grille cloth, and the top/sides need to be glued back onto the front arch. Also, the rear arch needs to be glued back on, and the chassis needs restoration. All basically easy fixes. It's a single 47 type also, with the later type bottom molding and a bakelite escutcheon.