This old oscilloscope uses two tubes and a CRT and is powered from a simple Power supply from the AC Power line. Of course the maximum frequency to be observed is about some megahertz. Precision is given by the capacitors.

This old oscilloscope uses two tubes and a CRT and is powered from a simple Power supply from the AC Power line. Of course the maximum frequency to be observed is about some megahertz. Precision is given by the capacitors.