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(9) Rhythm/Crunch Selector
This button selects between the Rhythm and Crunch modes on the Triple XXX 40/EFX. The adjacent LED will
illuminate when the Ultra channel is selected.
(10) Rhythm/Crunch Channel Activation LED
This LED‚ when illuminated‚ indicates selection of the Rhythm/Crunch channel and in which mode the channel is
currently operating. The mode selector button (9) will determine which mode‚ Rhythm or Crunch‚ is active.
(13) Bass
This passive control regulates the low frequencies for the Rhythm/Crunch channel.
(14) Mid
This passive control regulates the mid frequencies for the Rhythm/Crunch channel.
(15) Treble
This passive control regulates the high or treble frequencies for the Rhythm/Crunch channel.
(17) Volume Boost (Non EFX model only)
This knob‚ allows you to set the level of the volume boost when yellow LED (18) is illuminated.
(18) Volume Boost LED
This LED illuminates when the Volume Boost (17) has been activated by the footswitch.
(19) Channel Select Switch (Non EFX model only)
This 2-position toggle switch allows selection between the Ultra and Rhythm channels. Channel switching can also be
accomplished by footswitch. See the FOOTSWITCH section of this manual for explanation of switch operation. The
CHANNEL SELECT SWITCH must be set in the Ultra position in order for the footswitch to operate properly.
(20) Power Status Lamp
This indicator illuminates when mains power is being supplied to the amp.
(21) STANDBY SWITCH
This two-way toggle switch allows the amp to be placed in the STANDBY mode. In the STANDBY position the
tubes stay hot but the amplifier is not operational. Switching to the ON position places the amp in active mode.
This switch should be turned on a few minutes after the power switch in order to warm up the tubes.
(22) POWER SWITCH
This two-way toggle switch applies mains power to the unit. The red power status lamp (20) will illuminate when
this switch is in the ON position. This switch de-activates only one side of the mains‚ use caution when servicing.