For sale is reprint of Hammarlund SP-600 Instructions Issue4. Dated October 1952, Includes Supplement A. Includes sections on Operations, Maintenance and Alignment. Lots of detailed illustrations with part placement. Tube socket Voltage/Resistance tables, Part List. 40 Pages with 2 11x17 Circuit and Connection Diagrams. Supplement A consists of 6 updated pages and 4 diagrams including 2 11x17 foldouts. Must for every owner of this great receiver. Real Paper Manual. Quality Printed and Comb Bound. Printed from available copy or scanned from original at 600dpi, restored in Photoshop, Laser printed on premium acid free paper, they will serve for years. Most manuals Include foldout of Circuit Diagram. Cover page printed on Cover Stock.