SUBSCRIBE for more videos! Bogner Amplification's Mephisto 1x12" combo is a parallel amplifier design invented by Bogner Amplification. Featuring two independent amplifiers (6V6 & EL84) that can be switched between or blended and mixed together. Guitarist John Z is playing into the high gain input and controlling the gain from the guitar volume control. The cardboard signs between the takes let the viewer know what channel of the Mephisto was used (6v6 or el84 or both).
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