Mini all valve practice amp with 1" CRT monitor

[jrehwin]

Oh, that's a sweet project. I'm guessing you're using the AC sine wave as the sweep signal?

[MarcusV2]

@jrehwin Thanks, a simple 5663 mini thyratron (gas triode) circuit provides a sawtooth sweep the 50hz ac sine wasn't quick enough to provide a decent display of the higher notes.

[howardrhughes]

Holly hell