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Operating Voltage
The Nº383 Integrated Amplifier is set at the factory (internally) for
100V, 120V, 230V, 220V, or 240V AC mains operation @ 50 or 60Hz.
(230V/50Hz only in European Union countries, in compliance with CE
regulations.) This voltage setting cannot be changed by the user.
Make sure that the label near the AC receptacle of the Nº383 indicates
the correct AC operating voltage for your location.
If the voltage indicated on your Nº383 is incorrect, or if you wish to
change the AC operating voltage of your Nº383 as the result of moving
to a different country than the one in which you purchased your
preamplifier, see your Mark Levinson dealer.
The Nº383 is powered by a normal 15-ampere AC mains line. If other
devices are also powered from the same AC line, their additional power
consumption should be taken into account.
Warm up &
break-in period
Although your Mark Levinson Nº383 Integrated Amplifier delivers
outstanding performance straight out of the box, you should expect to
hear it continue to improve as it reaches its normal operating tempera-
tures and its various components “break-in.” It has been our experience
that the greatest changes occur within the first 25-50 hours, but that
the Nº383 will continue to improve in sound quality for about 300
hours, after which time it remains quite constant.
The only exception to this rule is if power is removed from the unit, al-
lowing it to cool down. In this case you should expect a brief warm-up
period before its sound quality is at its best. (Fortunately, you do not
have to repeat the full 300-hour break-in period.)