Marantz PM-17mk II User Manual page 8

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BALANCE control
Turn to correct the left-right imbalance which may occur in ste-
reo broadcast reception or otherwise change the output level
of either the LEFT or RIGHT channel. Be careful of the position
of this control because turning it fully clockwise or counter-
clockwise mutes the sound from the other channel.
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SOURCE DIRECT switch
When this switch is pressed in, the signals are transmitted by
bypassing the BALANCE and tone (BASS and TREBLE) con-
trol circuitry so that they can be reproduce with a higher quality.
(The BALANCE, BASS and TREBLE controls are defeated.)
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Warm-up meter
With any audio unit, the real sound quality cannot be obtained
immediately after the power is turned on, and warming up is
required to make the unit exhibit its full performance. As time
passes after the power has been turned ON, the temperatures
of different parts of the unit become constant and the electro-
lytic capacitors become active.
This meter allows to check the warm-up condition of the unit.
The meter needle starts to swing gradually in a little while after
the power is turned ON and reaches about 2/3 of the meter's
full scale in about 30 minutes. Now the unit has almost been
warmed up and can reproduce music with its original perfor-
mance.
The meter positions immediately after turning power on and at
the end of warming up and the time taken for warming up are
variable depending on the temperature, ventilation and other
conditions of the listening room where the unit is located.
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