YOU have been hearing radio enthusiasts talk about "That imported head set that gives such wonderful The Phones That the Fans Are All Talking About Beautifully finished with heavily nickeled brass casing and comfortable,sani- tary leather covered head bands. The care and operation of each model of Re- ceiving Tube is fully explained in our new 4o page "Radio Tube Data Book." Copies may be obtained by send- ing ten cents in stamps to our San Francisco office.ġ54 West Lake Street Chicago 30 Church Street The filament current is only one -fourth of the filament current of the pre- vious type of Amplifier tube and it is, there- fore, possible to use four of these tubes in a set without exhausting the storage battery any faster than when using only one of the previous types of tubes. This tube has a standard four prong base, and the glass bulb has the same dimensions asĬ -3oo and C -3o1. The famous Cunningham C -3o1A Amplifier shown above is a high vacuum tube designed for use as an amplifier and detector containing a new Tungsten Filament, the characteristics of which are long life, low power consumption, low operating temperature and greater power amplification than any previous amplifier tube. THROUGHOUT the entire country today Cunningham Radio Tubes are recognizedĪs the ideal tube for use in all makes of Radio Receiving Sets. RADIO TUBES For Every Make of Receiving Set Licensed for amateur, experimental and entertainment use in radio communication.Inv other use will be an infringement. Filament Current.Ĭusudughwm tubes are rorered by patenta dated 22 -7-05, 1-25-07, 2 -28- oh, and others issued and pending. Yin: C -toaA gives greater Power Amplifica- tion with only Amp. so C-11 -Similar to C -tt with standard base de Amp $6.50 C- too- SColtsGasCon- tent Detector. C- to - Volts 1-4 Ampere filament l0.50 0-299 -s Vol to.96 amp.
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