1956 Motorola 56T1
Coat pocket radio, aluminum cabinet
5 1/16 x 3 1/8 x 1 1/2 inches / 129 x 79 x 38 mm
Five transistors (Texas Instruments, 2x 2N146, 2N172, R35, TI354), superheterodyne circuit
One standard 9-volt battery
Manufactured by Motorola, Inc., Chicago, Illinois
Motorola's first transistor radio. It's very likely that production began in late 1955 and the 56T1 became available for sale in early 1956. It uses a standard 9-volt battery and it has a PC board. Interestingly, on this example (see the chassis photo below), each Texas Instruments transistor has been over-stamped with a Motorola "M" logo, either on the top of the transistor or on the face bearing the TI logo.
The cabinets of some of Motorola early transistor radios seem to have been more fragile than those of other manufacturers of the time, and for several reasons — this 56T1 has a nickle-plated cabinet coated with a gold-color lacquer that has turned out not to stand the test of time very well: on many examples the lacquer has worn away in places, leaving the nickle color exposed. Another problem was plastic mold, as was often found on the 7X23E and several other Motorola models as well.