It’s software but it sounds nice
Knif Audio Knifonium - Playthrough
The Knifonium is an exceptionally beautiful-sounding monophonic synthesizer that is driven by a whopping 26 vacuum tubes. The semi-modular design of this upscale synth features two tube-driven oscillators, a 4th order ladder filter, a ring modulator, and a gorgeous “steampunk” aesthetic.
This plugin emulation of the Knifonium adds 8 independent voices to the synthesizer, opening up an entirely new universe of possibilities. Imagine an atmospheric pad sound produced by a total of 208 vacuum tubes!