[klondike98]

OK here are some links that you should know about:

Beginner Overview: http://www.antiqueradio.org/begin.htm 
Resources for Philco & other radios: http://www.philcoradio.com/resourceb.htm 
Philco Technical Info: http://www.philcoradio.com/tech/index.htm
Philco Repair Bench: http://www.philcorepairbench.com/
Philco Service Bulletins/Schematics (more info and more readable than Nostalgiaair.org): http://www.philcorepairbench.com/schematics.htm

Hope that helps.