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A Specially
Designed Tube
For Every
Radio Use
Cunningham Radio Tubes
C-8O1A — 6 Volts Vi amp.
Amplifier $C>50
C-299 — 3 Volts .06 amp. Dry Battery Det. and Amp 6.6O
C-8OO -6 Volts Gas Content Detector 6.OO
C-ll— 1.1 Volts .25 amp. Dry Hattery Det. and Amp. Special Base... <>.;.<>
C-18— Similar to C-ll
with standard base. . . 6.5O
Home Office: 248 First Street San Francisco, Calif.
// Bridges the Vastness of Space
SINCE Marconi first successfully spanned the Atlantic Ocean, with the wireless telegraph, radio has ever been outstanding as an invention of unlimited importance to humanity.
In 1909 the broadcasting of that now famous distress call, CQD, from the sinking passenger liner, S. S. Republic, established in the eyes of the entire world the tremendous importance of radio on the high seas.
In 1912, when that gigantic liner, the S. S. Titanic, struck an iceberg far from shore, in the north Atlantic, with thousands of passengers aboard, it was the SOS call of her wireless that brought rescue ships from all parts of the ocean. Here again radio demonstrated to the world its great service in the saving of human life.
During the war communication controlled the destinies of armies. Here radio played an exclusive part in the establishing of communication between ships at sea, from ship to shore, and from aeroplane to ground, where the use of wires was impossible.
In recent years the development of the vacuum tube has not only improved radio for the purpose of marine, commercial and military communications, but through radio telephony and public broadcasting, has established a new and even greater service to humanity.
Cunningham Vacuum Tubes are the product of years of research and experimental work by the Engineers of that great scientific organization, the Research Laboratory of the General Electric Company.
Cunningham Tubes are standard for all makes of receiving sets, ' Each of the numerous types have been designed to operate with maximum efficiency in one or more of the various applications of vacuum tubes to the radio art.
'P-a + *»Ml Mr»fJ/»^» Cunningham tubes art cov
ratent iMotice. ered by patfnts data \ 1-7
05, 1-15-07, 2-18-08, and others issued and pending. Licensed for amateur, experimental and entertainment use in radio communication. Any other use will be an infringement,
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154 West Lake Street Chicago, Illinois
30 Church Street New York City, N. Y.
Tested and approved by RADIO BROADCAST
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