Point Contact Transistors

US Point-Contact Transistors 1949-1952

The following transistors were on the market or in development at around the time Texas Instruments began their development of their first transistor the Type 100 point contact type.

Collection of early point-contact transistors in development in the period 1948-1952 courtesy Joe Knight.

Left to Right

Bell (Western Electric) Type A (1948-49)

Raytheon CK703 (1948-9)

RCA prototype TA 151C (1949)

Sylvania GT 372 (1949)

General Electric Z2 (1949)

RCA prototype TA 166 (1951)

Raytheon CK716 (1951-52)

Western Electric 1698 (1951-52)

CBS-Hytron PT2A/2S (1952)

Transistor Products 2A/2B (1952)

General Electric G11/G11A (1952-53)