https://khdkelectronics.com/no-2clean-boost/
The No. 2 is KHDK’s original Clean Boost, utilizing the strength of KHDK’s unique circuit. Providing a warm, tube-like boost, it was designed for those who appreciate a natural and subtle gain.
Best used as a tool for shaping your tone on a quality all-tube amp, the No. 2 allows the organic and transparent EQ controls to fully develop your tone.