For Sale: (4) RCA Tube Handbooks (each 5 1/4" X 7 1/2" X 2" to 3" thick). Receiving tube in 3 binders (0Y4-6DZ7, 6E5-13GF7A, 14A4-7086). 4th binder Receiving tubes industrial and premium (red) (1L4-9006). Dates of sheets range from late 1930's to mid 1960's. All are in excellent condition. $35 + 10.95 priority flat rate. Thanks, Pat K9HF