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HP650A Test Oscillator (ca. 1948)

Retronics series

HP650A Test Oscillator (ca. 1948)
My collection of test equipment includes a Hewlett-Packard HP650A Test Oscillator. That model was launched in 1948, but the relatively high serial number in this case (5793) means it’s an open question who’s older: the device or its owner (model year 1954). Here I would like to tell you about how I acquired the device and how I brought it back to life and even updated it.
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Retrotronics EST’D 2004 inset EN
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