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MADRIGAL AUDIO LABORATORIES
R
Nº 333
DUAL MONAURAL
POWER AMPLIFIER
2
1
Front Panel
1STANDBY BUTTON
When power is first applied to the power amplifier (if yours is a CE-certi-
fied unit, this means plugging it in and turning on the rear panel AC mains
switch
), the amplifier remains off. Pressing the front panel standby button
will bring the amplifier from off to standby. After a delay of ten seconds (to
allow the power supplies to charge and all circuitry to stabilize), subse-
quent pressing of the standby button will toggle the amplifier between
standby mode and fully on. Power consumption of the Nº333 (the most
extreme example) when at idle is approximately 350 watts—the equivalent
of leaving a few light bulbs on. When in standby, the amplifiers still draw
as much as 200 watts to keep the sensitive voltage gain stages warmed up
and sounding their best at all times).
To turn the amplifier off (as opposed to standby), press and hold the
standby button for approximately one second, until the front panel indica-
tor light
turns off. To turn off even the supervisory power supply, you must
either unplug the amplifier from the wall or (in the case of CE-certified
units only) use the rear panel AC mains switch. (see below)
2 INDICATOR LIGHT
The indicator light shows the operational status of your Nº333:
Full brightness indicates that the Nº33 is on and ready to be used.
Blinking slowly indicates the unit is in standby.
Dimly lit indicates that the main power supply is completely off, leaving
only the supervisory supply operational.
Completely off indicates that the amplifier is not connected to the ac
mains, disengaging even the supervisory power supply.
If the amplifier will not turn on, you should check your AC connections, or
have your dealer inspect the internal fuses (which are not user-serviceable).
If yours is a CE-certified unit, you may want to check the rear panel AC
mains switch
to ensure it is in the on position.