Title: Receiving tube specifications & substitutions
Description: Contains the specs and substitutes for over 2000 (yes 2000) American and foreign receiving tubes. Includes entertainment, industrial, and military types. Lists electrical  and mechanical characteristics. The only complete book of receiving tube specifications and substitutes on the market. 6"x9", 140 pgs, #01-VT orig list $1.95 (1965).
Subjects: Specifications, Vacuum-tubes