Tube voltage switch, Figure 1 – preamp section – ART Pro Audio ProChannel II User Manual
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Tube Voltage Switch
The vacuum tube preamp section can be adjusted to run at two different plate voltages. Refer to Figure 1 for
the location of the switch.
Choose the “NORMAL” setting for adding warmth to the input signal. This setting has an increased amount of
tube saturation at higher signal levels.
Choose the “HIGH” setting to increase overall gain, headroom, and bandwidth.
NOTE: The change between tube voltage modes is gradual, taking 10 to 20 seconds to be fully activated.
FIGURE 1 – Preamp section
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