Lot of 1960s vintage vacuum tube manuals from General Electric and RCA. There is a 1963 544 page - RCA Receiving Tube Manual - Technical Series RC-22 - with a name on the front cover. There is also a GE Tubes Essential Characteristics - Receiving Tubes, Television Picture Tubes, and Special-purpose Tubes -.The GE catalog is spiral bound the the front cover is coming loose and the back cover is missing and a couple of the back pages are loose.