Power off the amplifier into Standby mode
Press the Power button to change the amplifier from power on mode to standby mode. The Power and the
Mode LEDs will both be extinguished during standby mode. During Standby mode the Mute LED remains lit
either solid green, to indicate ready for re-power, or, in the case of a fault, flashing red, indicating not ready for
re-power.
All deck LEDs are turned off in Standby mode, unless there is a tube fault being indicated. Please refer to the
Fault section for a full description of how faults are displayed in this amplifier.
Power off the amplifier at the rocker switch
If the user wishes to completely turn off the amplifier, turn the rocker switch in the back of the amplifier to the
off position. All LEDs on the front panel should be completely turned off in this mode.
Using the DF switches
The variable DF is an adjustable Damping Factor control that allows the user to adjust the output impedance of the
amplifier.
The two sets of DF switches are located on the deck of the amplifier in front of the 12BH7 driver tube. Please remove
the cage of the amplifier to access the switches and store the screws from the cage in a safe place for reuse. Always
mute the amplifier prior to changing the setting of the DF switches and use a long handle tool to access the switch to
prevent your hand from accidentally touching the hot tubes.
MB-450 Series III Signature Monoblock Owner’s Manual
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