
D-PRE is based on our Mini-Marshmallow amp, which was a tribute to Howard Dumble. The basic topology is here with typical values. Although many amp designers used the "overdriven Fender amp" as the basis for the preamp in a master-volume amplifier, Howard's is the most famous. D-PRE provides two distinct sounds: classic warm clean and late-over-drive distortion. We've added an extra 'Drive' control to the Dumble topology, making it more useful to a wider range of players. Two 12A_7s provide all functions in a pure tube audio path. Controls: Clean Volume Treble Mid Bass Mid-shift (sw) Jazz-Rock (sw) Over-Drive Level Early Drive Late Drive



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