McIntosh MR 71, Руководство пользователя

Страница: 6 / 20

MPX stereo indicator lamp. The transistor is
controlled by a noise-rejecting differential
detecting bridge circuit. The circuit discrimi-
nates between noise and the 19KC multiplex
pilot signal. The indicator will light only on
the 19KC signal present in a multiplex stereo
broadcast.
The MR 71 uses a new Mclntosh developed
automatic mono-stereo switching circuit.
(Pat. Pend.) The switching is electronic with-
out switching clicks or transients.
The circuit switches smoothly and silently
when the 19KC multiplex carrier is present.
The multipath signal indicator on the tun-
ing dial is an electron ray tube. This is an
exclusive Mclntosh development. Multipath
signal reception causes moderate to severe
distortion and poor stereo channel separa-
tion. By knowing the presence of multipath
reception, a directional FM antenna may be
rotated to reduce or eliminate the multipath
signal. The MR 71 multipath indicator shows
if there are multipath signals present by
rapid fluctuation of the electron ray beams.
With the antenna correctly positioned, the
indicator beams remain relatively steady,
showing that multipath distortion has been
eliminated.
Two pairs of audio output jacks are on the
back panel. One pair of jacks is controlled
only by the front panel volume control. The
other pair of jacks is controlled only by the
back panel output adjust controls. Two stage
feedback type preamplifiers on both chan-
nels provide low impedance outputs. More
than sufficient output volume is available to
feed power amplifiers as well as preamplifiers.
A new type of mechanical tuning assembly
gives the MR 71 extremely smooth flywheel
tuning action. The tuning capacitor is driven
directly, and in turn drives the pointer. Back-
lash is eliminated with this design. A teflon
lined pointer carriage and nylon pulleys re-
duce friction and wear to give an unusually
smooth and quiet dial action.
IF YOU ARE IN A HURRY
Turn antenna so the eye is steady.
Will light only on stations
broadcasting MPX stereo,
Tuning . . . select
desired station
Tune for center of black area.
In . . . eliminates interstation
noise. Out . . . use to receive
weak stations.
3
Continuously variable, use
Max. position for MPX reception.
automatically from stereo to mono.
Power off. Use stereo-auto
position: will switch
Tune for Max. reading.
Adjust to desired volume.