1956 7-transistor Westinghouse H-587P7A,
1957 5-transistor Westinghouse H-612P5:

3 1/8"H x 6"W x 1 3/4"D

Westinghouse was one of the last US manufacturers to come up with a transistor radio. The '56 587 was the first Westinghouse transistor, and probably the '57 612 was the second. What's odd here is that Westinghouse produced a 7-transistor set as its first, and a 5-transistor set as its likely second transistor radio. Other than Raytheon, most manufacturers of early transistor radios used a minimal number of transistors in their first model, and then increased the transistor count in later models as time went on and the price of transistor devices dropped...

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© 2007 by Robert Davidson, transistors@abetterpage.com