Restoring a Tektronix 222 Oscilloscope

You don’t usually think of electronics test equipment as cute, but the Tektronix 222, introduced around 1990, is an exception. It is a tiny CRT-based dual channel 10 Mhz bandwidth scope with digital storage. That’s right, even though it has a CRT, it is a digital oscilloscope that also uses the CRT to display vector character information on the screen. It can run from a built-in battery pack, allowing it to “float” above ground level when necessary. Here, a 222 is brought back to life, updated with a modern lithium-ion battery pack, and equipped with a custom-moulded replacement knob for the front panel.