In this issue

• Tube Manufacturing Companies in France A review of the different tube manufacturers in France.
• RMA/EIA Registrations by French Makers A list of tube registered in the RMA/EIA system.
• Wierd Tube of the Month: WECo 272A A WE tube with little documentation circa 1931.
• Application Note-RCA 7199 AN-183 describing this triode-pentode for audio applications.
• Perfected Tubes A 1928 Raytheon memo.
• A Bit of Raytheon History Early history of the Raytheon company.
• R.C.A. Tube Licensees, 1930 Radio Industries, May, 1930.
• Raytheon Four-Pillar Tubes A list of known 4 pillar tubes.
• Uncle Sam Buys Tubes, A Century Ago Lists of early tubes bought by the government from de Forest.
• Al Jones The background of the late tube collector Al Jones is presented.
• Humless Tubes DE forest and Marvin tout their reduction of hum in their tubes.
• A Fix fr WD-11 Tubes Putting the base of a WD-11 on a hearing aid tube.
• WE Worries About Transistor Testing WE discusses how to keep from distroying transistors during testing.
• Conservation of Critical Materials-1951 RCA needed to make sure they could continue poduction during the Korean War.
• Nuvistor Introduction RCAs Plain Talk and Technical Tips, June 1960.