Tubes - Valves

• CBS Reference Guide for Television Picture Tubes 1956
• Elorg Russian Tubes Datasheets
• MIL HDBK Tubes cross reference HDBK_213A 1963
• Muiderkring Tubes Handbook - 12th ed - 1966
• RSGB Service Valve Equivalents 1948 UK
• Tube Substitution Handbook 1960
• World Radio Valve Handbook ed Italiana 1951



• American substitutes for foreign types
• Foreign substitutes for American types
• Tube Number Systems