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Virtually all recording artists and sound engineers recognize the inherent superiority of vacuum tube equipment for recording, live sound reinforcement and musical production. Now, the ultimate mobile tube-based amplifier is a reality: Tube Driver B I_I_I E ZERO NEGATIVE FEEDBACK, OPEN-ENDED DESIGN With authentic Vacuum Tube response and an open-ended design, (ZERO global negative feedback), Tube Driver BLUE overcomes one of the most universally agreed-upon sonic problems plaguing virtually a