Radio broadcast .. (1922-30)

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. . . : • C-12— Similar to C-n with standard base Quality : plu5, Service since 1915 C-ll— i.i Volt .25 amp. Dry Battery Det. and Amp. Special Base C-299— 3 Volts 06 amp. Dry Battery Det. and Amp. WUUM*. TUBES FOR CLEAR DECEPTION To perfection in design are added the productive resources and scientific skill of the great General Electric Laboratories. The result — a series of Radio Tubes that give peak satisfaction in detection, amplification, and rugged long life. Amazing accuracy governs every step in Cunningham manufacture. Testing is carried to extremes in order to give to every purchaser a tube as nearly perfect as is humanly possible. Knowledge of Cunningham methods and policies is the answer to the why and wherefore of Cunningham pref erence. PRICE THE SAME ON ALL FIVE TYPES C-301-A C-299 C-300 C-ll C-12 C-301 A-6 Volts i amp. Amplifier PATENT NOTICE Cunningham tubes are covered by patents dated 2-18-08, 2-18-12, 12-30-13, 10-23-17, 10-23-17, and others issued and pending. Licensed only for amateur, experimental and entertainment use in radio communication. Any other use will be an infringement. Branch Chicago HOME OFFICE 182 Second Street, San Francisco 'Branch New York 467287 SEP 4 ,925