The Eric Johnson Blues Cube Tone Capsule from BOSS is a modification circuit intended for use with Roland Blues Cube series amplifiers. The tone capsule was designed in conjunction with guitarist Eric Johnson and transforms the amp's voicing to deliver sweet vintage tube tones and responses, giving Blues Cube an amazing likeness of Eric's remarkable sound.
This modification circuit, when used together with a Blues Cube series amplifier, provides the rich blues timbres and lead-tone presence of a classic tube amp, achieving this sound in the parameters of solid-state technology. Simply plug this capsule in to the compatible socket on a Blues Cube's chassis, and you'll instantly be able to change the inherent tonal characteristics of the amplifier.