ATTENTION!: THIS IS A CD, NOT A PHYSICAL/PAPER BOOK!!! Sylvania Tube Substitution Manual 1953 PDF on CD CD Contents: Sylvania Tube Substitution Manual (1953): 39 pages Format: pdf, Language: English "Quick reference for substitutions of critical Radio and Television Tubes." Table of contents of the Manual on the CD: General Tube Classification Chart Circuit Modifications Requiring Additional Resistors Substitution Chart for Battery Type Tubes Substitution Chart for 1950 Ma Tube Types Substitution Chart for 300 Ma Tube Types Substitution Chart for Transformer and Auto Tube Types Substitution Chart for Television Tubes Substitution Chart for Picture Tubes Frequently Needed Change-over Diagrams Also included on the CD: Sylvania Radio Tubes Characterics (1945): 20 pages Characteristics of sylvania transmitting tubes (1954): 12 pages COMPUTER REQUIREMENTS: This manual on CD will work on all PC, MAC Computers, tablets and mobile phones. The only software needed is adobe reader which in most cases is already loaded onto your computer, if not can be downloaded for free. It will be shipped by UPS/Air mail as a CD and money back guarantee! Windows and Mac compatable Important! Non US buyers please be sure that your State/Province/Region element is filled by you either in your paypal account Profile and settings/Address section or in your Bonanza account Settings/Address section when you make order because this is necessary in order that the order processing can be a little bit quicker! Thank you for your cooperation! Ringostarn Shipping is Free.