MODE SWITCH
The MC 7270 will operate in two modes, Stereo and
Mono Bridge.
LEFT AND RIGHT OUTPUT TERMINALS
For stereo operation, output impedances of 1, 2, 4 and
8 ohms have been provided on a secure, screw type bar-
rier strip. For rnonophonic operation proper interconnec-
tion provides 2, 4, 8, and 16 ohms at the same barrier
strips. See page 7 for connecting instructions.
INPUT JACKS
In the stereo mode of operation, both Left and Right in-
put jacks function. In the mono mode of operation only
the Right (MONO) channel input jack accepts signal. In
mono, the Left channel input jack is disconnected.
INPUT LEVEL
The input sensitivity of the MC 7270 is 0.75 volts or
2.5V depending
on the
position
of the
INPUT
LEVEL
switch. For the best signal to noise ratio when using Mcln-
tosh source
equipment,
place
the
INPUT
LEVEL
switch
in
the
2.5V position
and the
front panel
LEFT
and
RIGHT/MONO GAIN controls in the fully clockwise posi-
tion. If more gain is desired the 0.75V position may be
used. All Mclntosh preamplifiers have been designed to
deliver 2.5 volts output with rated input. For source
equipment other than Mclntosh, set the switch in the
position nearest to the stated output rating of the source
equipment.
AC POWER
The input to the MC 7270 is 120 volts 50/60 Hz at up to
12 amps. The primary circuit is protected by a 15 Amp
Fuse.
REAR PANEL INFORMATION 13
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