A SURVEY OF EARLY POWER TRANSISTORS by Joe Knight GE 1950s SILICON POWER TRANSISTORS
Further in the back of this manual, we see the new GE 2N451-454 "SiPwr" series shown in the 'Transistor Listing'  section on page 158, again rated at 85 watts of dissipated power. The next closest power devices in this listing were a few germanium 55 wt. Delco Power Transistors.
The corresponding GE transistor output device Drawing No. 6 is shown on page 163, and reflects the unusual basing design seen earlier, quite different from anything the other manufacturers had used to date, at least in 1956-8. Westinghouse went on to use a variation of this basing in 1958/59 with their own High Power Silicon Transistor "2N1015-1016" product line (see the Westinghouse chapter in this same historical series). While the threaded stud connection was just beginning to surface on some other device designs, this new enclosure package reflects an approach soon to be undertaken by Westinghouse and Pacific Semiconductor (PSI). Go To GE Early Power Transistors, Page 5
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