ATTENTION!: THIS IS A CD, NOT PHYSICAL/PAPER BOOKS!!! RCA Transmitting Tubes Manual Technical Manual TT-3 TT-4 TT-5 1938 1956 1962 PDF on CD CD Contents: RCA Transmitting Tube Manual Technical Manual TT-3 (1938): 194 pages RCA Transmitting Tube Manual Technical Manual TT-4 (1956): 260 pages RCA Transmitting Tube Manual Technical Manual TT-5 (1962): 324 pages (The book originally has 224 pages, but its condition is not the best. So the file includes a better quality book of the same type, but with 222 pages. It has no back cover. But this does not affect the usability of the book. Overall the book is 100% complete.) Format: PDF IN ZIP, Language: English "These Manuals on CD have been prepared for those who work or experiment with transmitting tubes and circuits. It will be found valuable and useful by/to engineers, service technicians, educators, experimenters, radio amateurs, students, experimenters and all others technically interested in transmitting tubes. " COMPUTER REQUIREMENTS: These manuals on CD on PDF in ZIP format after copy them to the computer or put them to the device will work on all PC, MAC Computers, tablets and mobile phones. The softwares needed are adobe reader/adobe reader app and WinZip program which in most cases are already loaded onto your computer/device, 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 well either in your paypal account?s Account Settings/Account owner information/Address section or in your Bonanza account?s Account Dashboard/Settings/Account Info/Contact 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.