1967 Precision Supplementary Tube Test Data for 640 and 660 Tube Testers



For sale is reprint of Precision Apparatus Company Supplementary Tube Test data for 640 and 660 Tube Tester. Book is 48 pages, For Use With Roll Chart TRC H2B. Tube Data is dated January 2nd 1967.

If you purchased one of those testers from Ebay and it did not come with Tube Test Data or your roll is out of date, here it is.