nates the possibility of the tuner drifting off
the station. The AFC circuit in the MR66 in-
cludes an Electronic Delay which is an exclu-
sive Mclntosh development. As the tuning
dial is moved, the AFC circuit is temporarily
cut off. Approximately three seconds after
the dial pointer has come to rest on a particu-
lar station, the AFC action gradually comes
into operation. The AFC automatically brings
the electrical tuning to the correct point for
minimum distortion. This automatic tuning
repeats itself each time the FM dial is moved
to a different station.
The degree of AFC action is adjustable
with the AUTO FREQ CONTROL. Full left
(MIN) position of the control cuts off AFC
action. Full right (MAX) position gives maxi-
mum AFC action.
Normally, the best tuning occurs with the
AUTO FREQ CONTROL set at or near MAX
position. If several stations are very close
together on the dial or if a desired station is
close to a much stronger station, a lower
AFC setting is usually necessary for best
tuning.
FM FUNCTION SWITCH
FM Out
Turns off the FM section of the MR66.
Mute In
Turns on FM with the Mclntosh developed
ultrasonic mute-in operation. Ultrasonic mut-
ing suppresses all noise between stations
including noises heard tuning in and out of a
station. Weak or distant stations mixed with
noise or interference are also suppressed.
Mute Out
Turns off the ultrasonic muting to allow con-
ventional FM tuning with inter-station noise
present. Use this setting to listen to weak or
distant stations that may be mixed with noise
or interference.
BACK PANEL INFORMATION
Figure 6- MR66 Back Panel.
FM MULTIPLEX OUTPUT
Connects to the input lead of the Mclntosh
MA6 FM multiplex adapter.
FM MULTIPLEX POWER
Connects to the Mclntosh MA6 FM multi-
plex adapter power plug. Correct operating
voltages are supplied for the MA6 (6.3 volts
AC at 1 amp and 120 volts DC at 25 ma.)
MULTIPLEX INPUTS
Connect to the Mclntosh MA6 FM multi-
plex adapter output leads.
AM ANTENNA
Terminals for connecting the AM antenna
to the MR66.
Figure 4. Auto Freq Control.
5
Figure 5. FM Function Switch.
