Vacuum Tube Synthesizer

A powerful bass synth with a sound source based around a vacuum tube oscillator.
The acid bass machine with the pinnacle of modulation and distortion.

The volca nubass is the first analog synth to be equipped with a Nutube new-generation vacuum tube in its oscillator. Vacuum tube plus analog means that the sound is warm, thick, and rich. The familiar transistor ladder filter gives it the character of a classic bass machine, along with overdrive, and huge-sounding distortion.

https://www.korg.com/us/products/dj/volca_nubass/