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HI FILTER SWITCH
This switch can be used to reduce high frequency
noise such as that associated with the playing of
poorly recorded tapes or worn disc recordings.
When the AM tuner is being used, this switch will
help to suppress considerably the high pitched
"whistle"
caused by adjacent AM channel inter-
ference. This filter will also, along with high fre-
quency noise, slightly attenuate high frequency
program material, and should therefore be used
judiciously.
MONO SWITCH
When a marginal stereo signal is received, random
noise and phase modualtion may cause the tuner's
multiplex circuitry to trigger the STEREO mode
intermittently.
In this case, it is sometimes desir-
able to cancel the multiplex operation entirely in
favor of obtaining a more listenable signal. The
MONO switch performs this function
and con-
verts all output
signals to the MONOPHONIC
mode.
While playing a single channel source such as TV
or AM, depress the MONO pushswitch to hear the
source through both speakers. When playing a
monophone phonograph record, use this push-
switch to suppress rumble, record surface noise,
and pinch effect distortion.
TAPE 1 MONITOR SWITCH
When this pushswitch is "out", the program being
recorded and heard is determined by the setting
of the SELECTOR switch. With the TAP~ 1
MONITOR pushswitch "in",
the amplifier input
connections are switched to the output
of the
tape recorder without
affecting the signal pre-
sented to the tape recorder's input, thus allowing
you to listen to the signal being recorded before
and after recording. This switch is also known as
the TAPE-SOURCE switch.
7
TAPE RECORDING
AND DUBBING
RECORDING
The program source selected by the SELECTOR
switch may be recorded on to either tape record-
er. When the SE LECTOR is set to TAPE 2, how-
ever, the TAPE 2 OUT JACKS are muted to pre-
vent feedback oscillations that would occur if
tape recorder 2 were inadvertently placed in the
record mode.
DUBBING
A tape played on tape recorder 2 may be copied
on to tape recorder 1. Set the SELECTOR switch
to TAPE 2. To monitor tape 1 as it is being re-
corded, depress the TAPE 1 MONITOR switch.
To monitor the source (which is, in this case, tape
2), releaseTAPE 1 MONITOR switch. Either tape
or source can be monitored without
disturbing
the actual recording process.
RECORDING DOLBYIZED
FM PROGRAMS
Dolbyized
FM
broadcasts contain
Dolbyized
audio information to which a special pre-emphasis
is applied for the purpose of improving the noise
reduction process. To make a Dolbyized tape re-
cording of such broadcast, depress the FM-25pS
switch to properly de-emphasize the signal, but
bypass the noise reduction adaptor to record the
Dolbyized audio directly onto the tape. This can
be done by switching the Noise Reduction switch
to "OFF"
if the Dolby adaptor is so equipped, or
by connecting the TAPE OUT jacks of the 2252
directly to the LINE IN jacks of the tape deck.
The inputs to the tape recorder in this application
must be properly calibrated beforehand according
to the procedure detailed in the Dolby unit's in-
struction booklet. To achieve proper calibration,
it is necessary that the record level control on the
Dolby unit be adjusted to the proper Dolby level
by use of the reference tone transmitted by the
FM station.
For monitoring purposes, connect the Dolby unit
between the line outputs of the tape recorder and
the TAPE IN jacks on the 2252.
When using a tape recorder containing a built-in
FM-25pS de-emphasis circuit, a better signal-to-
noise ratio can be achieved by using only the
FM-25pS circuit in the Model 2252 instead of
the facilities in the tape recorder. Do not use both
de-emphasis circuits simultaneously.
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