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May 1949 Radio & TV News
 [Table of Contents]
Wax nostalgic about and learn from the history of early
electronics. See articles from
Radio & Television News, published 1919-1959. All copyrights hereby
acknowledged.
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When this May 1949 issue of Radio & Television
News was being written, Messrs.
Bardeen.
Shockley, and Brattain had recently announced to the world their invention of the point contact
germanium transistor. Sylvania Electric here is touting a miniature pocket radio featuring their
line of subminiature (aka "peanut") tubes. Tubes like the
1AC5
'only' needed about 60 volts for operation as opposed to 300 volts or more for standard tubes. This
required a voltage multiplier circuit that consisted of inductors, diodes, and capacitors for implementation,
which added significant volume to the radio. It was in the Autumn of 1954 that Regency began selling
its TR-1 transistor radio - the
world's first.
Sylvania Peanut Tube Radio Advertisement
In a Radio Set
How small can you get?
Sylvania's four tiny new tubes hold the answer
The miniature radio set shown here is an example of what can be done through the use of Sylvania's
new subminiature tubes.
These specially designed and engineered T-3 subminiatures are battery-type receiving tubes perfect
for very small radios or amplifiers. Short tube leads provided in conventional pin arrangement permit
these tubes to be plugged into appropriate sub-miniature sockets. They can be operated over a wide range
of battery voltages. Low current requirements result in battery economy.
Send for complete ratings and characteristics.
Sylvania Electric Products Inc., Advertising Dept., R-1005, 500 Fifth Ave., New York18, N. Y.
Four new Sylvania subminiatures shown in place in tiny radio set. Note size in relation to pencil.
Sylvania Electric
RADIO TUBES; CATHODE RAY TUBES; ELECTRONIC DEVICES; FLUORESCENT LAMPS. FIXTURES. WIRING DEVICES,
SIGN TUBING; LIGHT BULBS; PHOTOLAMPS
Radio Tubes; Cathode Ray Tubes; Electronic Devices; Fluorescent Lamps, Fixtures, Wiring Devices,
Sign Tubing; Light Bulbs; Photolamps
Posted July 25, 2016
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