Cunningham AudioTron Tubes Type C-300 The Wireless Age Magazine Jan. 1921 P5

This rare, ancient, Wireless Age, January 1921 issue of the now defunct, early radio magazine - The Wireless Age - on Page 5 had the following;

---

"Cunningham AudioTron Tubes
With Standard Four Prong Base. Type C-300.

Embody all the knowledge and skill of many years' research by the leading vacuum tube engineers. The New CUNNINGHAM TUBES are manufactured to rigid specifications in the world's largest vacuum tube factory. Quantity production by machinery makes possible the remarkable price.

Receiving tubes ar of two general types. The high vacuum Navy type of rigid operating specifications for radio and tone frequency power amplification. Plate and filament adjustement are not critical. Detector properties are sacrificed to provide maximum amplification in multi-stage and complex circuits without distortion. An amplifying tube is necessarily an oscillator."

---

---