When was the transistor radio invented?
Transistor radio
The TR-63 was introduced by Sony to the United States in December 1957. The TR-63 was 1/4" narrower and 1/2" shorter than the original Regency TR-1. Like the TR-1 it was offered in four colors: lemon, green, red, and black. In addition to its smaller size, the TR-63 had a small tuning capacitor and required a new battery design to produce the proper voltage. It used the nine-volt battery, which would become the standard for transistor radios. Approximately 100,000 units of the TR-63 were imported in 1957.[12] This "pocketable" (the term "pocketable" was a matter of some interpretation, as Sony allegedly had special shirts made with oversized pockets for their salesmen) model proved highly successful.[25] With the visible success of the TR-63 Japanese competitors such as Toshiba and Sharp joined the market. By 1959, in the United States market, there were more than six million transistor radio sets produced by Japanese companies that represented $62 million in revenue.[12]