In 1991 Marshall released the Bluesbreaker in pedal form. The pedal was initially not a great success. The Blues Breaker came from the same line as the Drivemaster and Shredmaster, with the Drivemaster being a reissue of the Marshall Guv’nor. All three pedals were based on a Marshall amplifier. The Drivemaster and Shredmaster imitated the sound of a JCM 800 and JCM 900 and the Blues Breaker was based on the sound of Eric Clapton’s Marshall model 1962 guitar amp.
In the early 1990s, distortion and hi-gain, in particular, were more popular than milder overdrive. In 1992 the Blues Breaker was made in a second version (mk2). This had almost the same circuit and housing but slightly more gain than the first version. After a few years this version was replaced by the BB-2 Bluesbreaker (now without a space). This version is still being sold and is much less popular than the first two versions.
The Marshall Blues Breaker is an analog overdrive pedal that can be used as a boost as well as a low-gain overdrive. The pedal has slightly less gain than most other overdrives. Furthermore, it is also called a transparent overdrive, which preserves the character and dynamics of your guitar signal. It’s a subtle effect that doesn’t quite resemble the sound of the amp it’s based on. The amp sounds a lot more aggressive than the pedal.