/diy/ - Do It Yourself

Been screwing with more tubes, figured out a way to plot characteristic curves which is very time consuming...adjust voltages, record data, repeat x number of times for each grid bias. I need a curve tracer, it's very interesting information.

Fried a 4BQ7, melted a hole in the plate because I wanted to see how much effort it would take to get the internal parts to off gas. The answer was not much and a crazy light show. When it finally gave out, it took out both cathode resistors and a huge flash, surprised the envelope didn't crack.