Marshall, 1962 Bluesbreaker E Bass The preamp in the Supro Thin Body Decke Zeder The preamp in the Supro Delegate employs a trio of 12AX7 tubes and a specially voiced 3 band EQ to make the most of the extended frequency response derived from the Mercury Magnetics transformer set so that it can be set up to act as a boosted clean channel or manipulated to make the channels sound like two completely different amps (the gain channel can be set from slight to very heavy distortion by simply using the drive and level controls) with two re issued Celestion Greenback speakers it’s sonic characteristics differentiate it and give it that recognisable sound John Mayall and the Bluesbreakers playing with Eric Clapton is what gave the 1962 ‘Bluesbreaker’® its name