Vintage THORDARSON model T-31W25A 25 watt beam power audio amplifier. Original old Sams Photofact manual includes schematic, layout, voltage & resistance test charts, repair parts list and description. Dated 1946. 4 pages. Thordarson Electric Manufacturing, Div of Maguire Industries, Inc. of Chicago, IL This manual would make a sensational accompaniment to your classic retro audio equipment.