This is a fairly simple guitar overdrive circuit. A simple 2N5088 transistor as preamplifier and an LM741 opamp.
First test video:
Final version (?) :
H&G Amplification is an manufactory that designs and manufactures music amplifiers, speaker cabinets and boutique guitar effect pedals.
Has anyone built this? What did you think of it?
¯\_(ツ)_/¯