[Ron Ramirez]

Disregard my previous comments about the autotransformer. I now see this model used a crystal pickup, so it did not utilize the autotransformer as used in some 1946 and 1948 Philco radio-phonographs (along with a phono preamp stage).

You have a Code 122 set, judging by the second photo you posted as well as the "MODEL 48-1262-122" stamped on the back of the chassis in your first photo. The changes sheet for Code 122 of this model mentioned a terminal strip with two capacitors and a 1 meg. resistor, which is shown in your second photo.

That cable should be connected from that terminal strip into the radio chassis, with the center conductor going to terminal 13 of the radio-phono switch, and the shield connecting to B-. C200 is not used in the Code 122 version of this model.

At this point, you need the factory service data. Since Chuck's schematic copy service cuts off at 1947, he may - or may not - have this info. It wouldn't hurt to ask:
http://www.philcorepairbench.com/schematics.htm

You can find the info at Nostalgia Air - but follow the notes for the 48-1283 included in this link:
http://www.nostalgiaair.org/PagesByModel...013614.pdf