Mullard Valves & Tubes Quick Reference and Equivalents Guides

• 1965 Valves & Tubes for Industry Communications and Radar (40 pages)
  
• 1969/70 Industrial Valves and Tubes (72 pages)
  
• 1970-71 Industrial Valves and Tubes (72 pages)
  
• 1971-72 Industrial Tubes and Special Products (72 pages)
  
• 1973-74 Valves and Tubes (56 pages)