Transistor Radios Around the World

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Before '54 --- North America --- Western Europe --- Japan and Pacific --- East Bloc and USSR

1955 RCA 7BT-10K

Portable radio, leather cabinet with aluminum face
10 x 6 5/8 x 4 inches / 254 x 168 x 102 mm
Seven transistors (Texas Instruments, RCA: 2x 234, 235, 4x 2N109), superheterodyne circuit
One 9-volt "battery pack"

RCA's second (possibly first) transistor radio, released in late 1955 at about the same time as the 7BT-9J coat pocket radio, maybe within weeks or even at the same time. It used nearly the same transistor complement as the 7BT-9J — three silver oval TI transistors (234, 235) and four black epoxy 2N109 RCA transistors (the 7BT-9J used only three 2N109s). Like several other early US transistor portables, the 7BT-10K had an aluminum chassis with socketed transistors and LOTS of space there between the components!

1955 RCA 7BT-10K

chassis — click on the photo for a larger image

label on inside back — click on the photo for a larger image

page from the Spring/Summer 1956 Continental Products (Chicago) mail order catalog, showing
the first two RCA transistor radios, the 7BT-10K portable and the 7BT-9J coat pocket radio

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