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STANDBY applies high voltage to the vacuum tube anodes (and screen grids) during use of the Plexi. To ensure long tube life,
first power the unit on with the STANDBY toggle switch in UP position for approximately 30 seconds. You can then switch to
DOWN ("ON") to use the Plexi. With the toggle switch in the UP position, the Plexi is in STANDBY mode. In the DOWN
position, the Plexi is in OPERATE mode
INDICATOR will illuminate when the Plexi is powered by turning the front panel POWER toggle switch to the ON position. If
INDICATOR does not turn on, check your power cable connections, and then the fuse on the rear of the unit.
PRESENCE adjusts the high frequency response of the power amplifier using negative feedback. Use this control to add
sparkle and clarity to your tone.
BASS adjusts low frequencies
MIDRANGE adjusts the mid frequency response
TREBLE adjusts the high frequency response
VOLUME I sets the overall volume and gain of the "BRIGHT" channel of the Plexi.
To engage the bright cap and a subsequent high frequency and gain boost (BRIGHT channel only), PULL the VOLUME I
control outward.
VOLUME II adjusts the overall volume and gain of the "NORMAL" channel of the Plexi
INPUT I and II are ¼" jacks for instrument cables. Plug your guitar in here. Use the I input for the BRIGHT channel. The
BRIGHT channel has more gain, more treble, and a more prototypical Plexi tone. The UPPER I input is higher gain, whereas
the LOWER I input is lower gain. Use the II input for the NORMAL channel. The NORMAL channel is much darker, lower gain,
and has an abundance of lower frequencies. The UPPER II input is higher gain, whereas the LOWER II input is lower gain.
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