As part of our investigation of electron tubes, we have a small CRT (bottom center) to experiment with. We have 5KV (right meter) for the second anode supplied from a cable tester (large black box). The two white dots on the screen are a result of driving a single deflection coil with a 555/power transistor circuit. Note the small stream of smoke in the lower right corner as we exceed the power capacity of a current limiting resistor.
