For sale are reprints of Jackson 648 Tube Tester User Manual and Tube Test Data.User Manual is 2 pages long, manual was retyped as original was in very bad condition . 70 pages of additional tube data is included. 17 page Special Tube Test Data form SP648/11 dated 5/64, 6 page Data Supplement SP648-2, 18 page Tube Tester Data dated March 1975, 9 page Special Tube Data with 1 page August 1975 supplement. This manual includes many tubes not on tester\'s roll chart.Real Paper Manual. Quality Printed and Comb Bound. Printed from available copyor scanned from original at 800dpi, 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.

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