Tube driven overdrive

The Tube Drive™ contains Three dual triode tubes operating at 300VDC and biased to produce extremely symmetrical signal clipping across 6 cascaded gain stages. In practice this means the pedal responds empathically to pick attack with a smooth and graceful breakup characteristic on low drive settings, producing an expressive warm blues tone.

Increasing the drive introduces rich and musical harmonic overtones that pack serious punch for a larger-than-life, “hot-rodded” amp tone. The tone quality of the Tube Drive exceptionally musical, organic and sounds distinctly different to pushing an amp with a solid-state diode clipping or even hybrid opamp/tube overdrive pedal and it won’t mask the natural sound of your guitar and amplifier.

https://www.effectrode.com/products/effects-pedals/tube-drive-overdrive/