http://www.ck722museum.com/ WebMar 20, 2024 · i saw a transistor history page on the web, and the story is that Raytheon was making transistors for the military, and if it fell outside the military specs, but still worked, they marked it as a CK722 and sold it on the hobby markets... they also marketed some commercial versions with better defined specs than the hobby devices.

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WebAt this time Raytheon began touting transistors as an alternative to the subminiature tubes currently in use in hearing aids. So the first commercial product to use transistors was the hearing aid. In 1953 Raytheon released the worlds first commercially available transistor, the CK722 initially sold for $8.00 and was popular with experimenters. WebOur first stop was the kitchen table, where Jack presented each of us with a single- transistor CK722 radio kit he had made espe- cially for this occasion. For example, in the 1956 Allied Radio Catalog, the very famous Raytheon CK722 (PNP audio germanium) transistor sold for $2.20. crystalvision ultra bulbs

The Irresistible Transistor - IEEE Spectrum

WebDec 1, 2006 · The first transfer-resistor (transistor) theorized was the JFET. Unfortunately they couldn't figure out how to make one with the current state of technology. Instead they made a Germanium transistor. The first transistor available to the public was the CK722 Germanium Junction Transistor from Raytheon, circa 1956. WebTo the left is shown a Raytheon CK722 diffused junction, p -n -p transistor with its 2 x .016 -inch leads and a miniature socket (Cinch Nos. 14148 or 14273 may be used). Even with a socket a small soldering iron should be used quickly. Two methods used to protect the CK722 in numerous experimental circuits are shown at the right of the picture. crystal vision williamsport