Vintage Radio Service Manual - PHILCO model CR-4 & CR-6  universal automotive 6-tube Superheterodyne AM car radio receiver. Manufactured by Philco Corp., of Philadelphia PA. Dated 1948. 4 pages. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list and description. This manual would make a sensational accompaniment to your retro audio equipment.