He wanted to experience this very cool tech, but since you won’t find a tube ... and use that as a triode. Inside every VFD is a filament, grid, and cathode – three simple elements also ...

This build from [mircemk] is of the latter variety, repurposing a VFD display to do the job. The project is built around a VFM202MDA vacuum fluorescent display, which provides that lovely green ...