In the words of Walrus Audio:

Dynamic, responsive, tube-like, and amp-like. Walrus
Audio is extremely excited to announce the new 385 Overdrive that is
boastfully responsible for all those adjectives. For decades now,
guitarists in search of pure tone have been taking the tube-powered
audio sections of vintage film projectors and using it as a guitar amp.
Heads up it sounds amazing. After endless hours of research on vintage
Bell and Howell 385 Filmosound projector, Walrus has created a
fantastic new overdrive modeled after the projectors tone. The Bell and Howell 385 gracefully lends itself to create an amazing guitar amp.