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Setting the Tube Plate Voltage
The DIGITAL MPA II allows the user select between one of two vastly different tube bias and power
supply levels. The transition between either setting is smooth and quiet and the gain variation is
minimal.
NOTE: It takes 15-30 seconds for the tube circuit to fully transition between either mode. During this
time, the unit passes a signal and the only noticeable change is a slight increase in level in the
“HIGH” setting.
The “Normal” setting produces a smooth transition from very clean low levels up to a “round” satu-
rated clipping on peaks. This setting is reminiscent of old tube gear, and used to get the most tube-
like sound out of the unit. Common uses include tracking with instruments.
The “High” setting of the plate voltage switch has increased bandwidth and headroom, very low
distortion and runs extremely clean until it reaches a point of saturated clipping. The clipping is well
controlled and still sounds natural. This setting is incredible on vocals.
