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Not at all. From the beginning we set out to not only make the first tube preamp for the 500 series, but the world’s first HIGH-VOLTAGE tube preamp for the 500 series. Think of the 583, 500DT and 500TDI as having a secondary high-voltage supply within the unit. All LaChapell Audio 500-series modules with tubes feature both a full 250 volts to the plates and a full 12 volts to the filament. This is the proper way of powering a vacuum tube and more importantly, allows the tube to behave the way it was designed without stress from a lack of power.