Regency TR-1
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The Regency TR-1 was the first commercially manufactured transistor radio, introduced in 1954. About 150,000 units were sold, due to the novelty of its small size and portability. Previously, transist
Regency TR-1 transistor radio
TR-1, circuit board and casing. Exhibit of Deutsches Museum, Munich.
22.5 Volt battery used in the Regency TR-1 (AA battery for comparison shown on left)
CONELRAD
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CONELRAD was a method of emergency broadcasting to the public of the United States in the event of enemy attack during the Cold War. It was intended to allow continuous broadcast of civil defense info
Regency TR-1
…It came in a cardboard box with the color stamped on the end. An optional earphone sold for $7.50. The red triangles on the frequency dial mark the CONELRAD frequencies of 640 and 1240 kHz. The TR-1 uses TI's NPN transistors, hand-picked in sets of four. A 22.5 volt battery provides power, since the only…
"CD Mark" symbols (usually simple white or red triangles) at CONELRAD's 640 and 1240 kHz frequencies were on the dials of most radios sold in the US between 1953 and 1963.
Cold War-era CONELRAD poster.
Car radio with CONELRAD frequencies marked with small red marks
First commercial transistor radio Regency TR-1 with small red dial markings