Vintage Radio Service Manual - COLLINS model 75A-1 14-tube. Superheterodyne commercial type multi-band (6) amateur ham receiver. Manufactured by Collins Radio Company, of Cedar Rapids, IA. Dated 1948. 12 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.