[Texasrocker]

Ive repaired many, many Philco sets using Riders. Never had a prob with Riders getting a set working again. Sounds like your set has definately been previously hacked electronically. Situations like these sometimes takes abit of patience, carefully looking at the schematics over again, very closely. Usually, if Riders left something out of the schematic, it wasnt a "critical" part.
I did have to purchase a Philco condenser data book, to help me yrs ago on the bakelite blocks mysterys, as sometimes Riders was vague sometimes. Best of luck restoring you vintage Philco !