This is a demo of Eric Barbour’s Metasonix S-1000 all-tube Wretch Machine in action.
There are different clips, some using the Wretch as a drum processor, some as a synth. There’s a short little bit with the pulser section too.
It’s not very nice sounding, but aren’t most synths trying to sound nice? Different is good.
via bigcitymusic

Metasonix, creators of tube-based analog music gear, has introduced what they call “The Ultimate Tube Synthesizer,” the Metasonix S-1000 Wretch Machine.
Pitch sources:

2 independent VCOs
Made entirely of vacuum and gas-filled tubes
Range >2 octaves using CV, octave switching allows range from 33 Hz (low C) to more than 2 kHz.
3 waveforms: thyratron sawtooth, square, and square with [...]