For sale is reprint of Hickok 600 Early Version Tube Tester manual. Manual is 10 pages long and includes 11×17 foldout of Circuit Diagram. Manual is dated 1948.
This manual is for first production series Hickok 600 testers. Early 600 testers lacked sub-miniature and in-line tube sockets. If your tester does not have those two sockets, this is the manual you need. Manual comes with 3 pages of Ballast Tube Data, Part list and Operating Instructions.