> I think it was later they made an electron beam digitizer > storage scope. The scope tube created a fan beam that was > deflected by single-axis deflection plates. The target had > patterns of stripes that decoded the beam into a binary code > that was then recorded in a digital memory. So, the fan > beam of electrons and the target formed the ADC!
That family of tubes is called an electron bombardment semiconductor. The target is actually a semiconductor wafer with an array of diodes to sense the position of the deflected swept beam, arranged in a Gray code. I did a video on one of the tubes sometime ago on my Youtube channel "uniservo". -- Will