On the day mini-amps were invented ... It is a doubly wondrous day indeed when an electric guitar-inclined maker realizes they can make their own. [Frank Olson Music] took apart an old pair ...

The design is inspired by the guitar amps of the 1950s and 1960s so it’s not for audiophiles. The circuit is a pretty conventional single-ended one with a two stage double triode preamp and a ...