For sale is reprint of Triplett Model 3423 Mutual Conductance Tube Tester manual. Manual is 16 Pages long. Includes 19 page Roll Chart Supplement. Manual includes chapters on Operating Instructions, Maintenance and testing picture tubes. Includes Replacement Part List and Circuit Diagram. 19 page Roll Chart Supplement to Chart T-84-37-030162 . Must for every owner of this rare tube tester. 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. Cover page printed on Cover Stock.