In this issue

• The George C. Clark Tube
• The Armor AC-100 Tube
• “Tubes That Weren’t”
• British Valve Nomenclature – Everyready
• Sweep Tubes in “Really Early” TV Sets
• Those 12-Volt Car Tubes
• July, 1937-(Invention of the Klystron)
• RCA Fixes 6BQ6 Quality
• Johnsonburg Radio Corporation