In this issue

• More on the “Dark” Heater
• The Tubes in ENIAC
• The Watson Collection
• Some “Amateur” Tubes in Canada
• “Rocket” and Other Early Planar Tubes
• Current Glass Receiving-Tube Manufactures
• “Instructions on Vacuum Tubes” US Navy
• Glass-Failure “Suck-Ins”
• RCA Salesman’s Report
• “BVA” Wartime Valves