For sale is reprint of Weston Model 978 Control Characteristic Tubechecker Tube Test Data. Manual is 52 Pages long, dated June 1960.  Manual covers tubes from 0A2 to XXL Test Data was created for Federal Aviation Agency by Morelock Company and is very detailed and complete. Real Paper Manual. Quality Printed and Comb Bound. Printed from available copy or scanned from original at 800dpi, restored in Photoshop, Laser printed on premium acid free paper, they will serve for years. Cover page printed on Cover Stock.