For sale is reprint of additional tube data for Stark models 12-22 and 12-22A Mutual Conductance tube testers. Book is dated Feb 28 1967. Data book is 49 pages long with: American 4-5-6-7 pin and Subminiature types, Western Electric types, European Types. If you own this tester this data book is for you. 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.