Precision 612 tube and battery tester manual
with tube data, reprint.

This is a digitally copied and enhanced manual for the Precision series 612 tube and battery tester.  It has been copied from an original and is clear, clean, and easy to read.  It is printed on premium 24# paper with heavy covers and bound with a plastic comb.  No more struggling with unreadable photocopies!

It measures 8 1/2" X 11". Topics include:  condensed tube testing instructions, introduction, features, general operating instructions, ballast information, qualitative paper condenser tests, battery testing instructions, service data, general notes and information, schematic, and supplementary tube chart Form ERC supplement (BE).