The two socketed transistors are of manufacture, type 58, with date code 1957 week 2. The historic object at right is on display at the Computer History Museum and is an example of an early experimental transistor digital logic board. The circuit board at top right holds four type 58 transistors, with date code 1956 week 44, and three Raytheon 2N113/CK761 devices (also labeled type 01) dated 1957 week 3. For example, the yellow cased transistor is likely a Texas Instruments type 200 and the silver units are either Sylvania or Radio Receptor types.

All of these transistors appear to be manufactured by other companies and not by. Note the collection of six transistors plugged into sockets across the top of one of the circuit boards used in the 608. It contained more than 3,000 transistors. Historic Germanium Computer Transistors Research and Collecting Kit Ģ Early Transistor Computer Circuit Boards: The above image is a section of a 1955 Fortune magazine ad introducing the 608, which was the first completely transistorized calculator available for commercial installation. The device on the far right is another mid-1950s Sylvania transistor, type GT692, manufactured to meet specifications including the double-height case style.

The three next type 51 transistors, with date codes in 1956, are likely Sylvania devices and are shown next to two 1955 Sylvania GT792 transistors with performance similar to the type 51. For example, the leftmost type 51 above is date code 1957 week 40 and is identifiable as an device based on the unique oval case shape and two-hole bottom header construction. used transistors manufactured by other companies for the 608 as well as transistors manufactured by. 1 Early Transistors: Shown at top are a series of early transistors that were qualified for use in the Model 608 calculator, introduced in The chart above lists the range of transistors types available at this time.

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