operation
PRELIMINARY: Be sure all tubes are
firmly seated in their
sockets and that the tube shields are making good contact
with their baSes. As initial adjustments, set these controls
as follows: LEVEL at 0, FOCUS at
0)' both BASS controls
at O. Turn the amplifier on by turning the
TREBLE 2 con-
trol clockwise from AC OFF and set it at zero
initially.
Also set the
TREBLE 1 control
at zero. Please note that
in the instructions that follow, it is assumed that a stereo
pick-
up and/or a stereo tape head is being
employed in
the system.
LISTEN IN G TO
PHONOGRAPH: Set the IN
PUT SELEC-
TOR to PHONO if you
have a megnetic cartridge or a
ceramic cartridge with adaptors interposed between the
cartridge outputs and the MAG. PHONO
1 and 2 inputs.
(The RIAA equalization provided at the PHONOposition
is now the international standard in the recording industry
for both monophonic and stereophonic records and is also
a very good compromise for the most important of
the older
monophonic recording characteristics.
) Set
the INPUT
SELECTOR to AUX Aor AUX B if you are using a stereo-
phonic crystal cartridge (Ronette) connected to eitherAUX
A or AUX B inputs. Set the FUNCTION
SELECTOR at
either STEREO position.
To balance levels between the
channels, playa conventional monophonic
(lateral) re-
cording on the changer or turntable and turn the
LEVEL
control up until you have
normal listening level.
Note
that the action of the
FOCUS control (sometimes called a
balance" control) is to simultaneously raise the level in
one channel while lowering the level in the other as it is
turned in anyone
direction. At the zero
setting of the
FOCUS control)' equal sound volumes would
obtain on both
channels only if the ideal conditions of identically effi-
cient loudspeakers and identical overall gains in both
channels existed. With the conventional monophonic re-
cording being played
, adjust the FOCUS control for equal
volume from each speaker system.
With the
FOCUS set-
ting properly made, any stereo recording played back will
have close to the same balance as actually exists in the
recording. The
FOCUS control setting can be a semi-
per-
manent adjustment in that
, at any given time, the setting
achieved as described above will usually be satisfactory
for tape stereo, and
may also be for broadcast
stereo, if
it means exist of adjusting for equal output levels from the
stereo broadcast rece iving equ ipment. As
components age,
a shift of the
normal FOCUS control setting may be nec-
essary. Note that there are a concentricpairofbass con-
trois, one in each channel and a concentric pair of treble
controls, one in each channel. Use the
separate bass and
treble controls to
compensate for any audible deviation
of the recording from the standard recording characteristic,
as well as to
compensate for the over-
all characteristics
of your audio system (including room acoustics). Set the
FUNCTION SELECTOR to
STEREO NORMAL or STEREO
REVERSE for
stereophonic records and to MONOPHONIC
PHON 0 for CONVENTIONAL MON OPHON IC records.
LISTENING TO TAPE DECK
(direct connection to tape
head): Set the INPUT SELECTOR to TAPE. NARTB tape
head equalization is provided in both channels for
the
tape speed selected with the
TAPE switch on the front
~nel'- One position is
for71/2and
15ips tapes and the
other for 3 3/4 ips tapes. These equalizations are the
industry standard for pre-recorded stereophon i
c and mono-
phonic tapes.
If the FOCUS' control has been set as
described in the preceding paragraph
, it will usually be
satisfactory for this function also.
Otherwise, it may be
set in a similar manner using a test tape or
simply by ear.
Set the FUNCTION SELECTOR to STEREO NORMAL
REVERSE for
stereophonic tapes or to
MONOPHONIC
TUNER
, AUX for
monophonic tapes. Use the BASS
and
TREBLE tone controls as described above.
LISTENING
TOAMONOPHONIC
SOURCE CONNECT-
ED TO AUXILIARY AI, AUXILIARY Bl
, TO
MONO-
PHONIC AM BROADCAST, OR
TO MONOPHONIC FM
BROADCAST: Set the
INPUT SELECTOR to AUX. A,
AUX.
, AM-FM, or FM-
MUL TI.
respectively and the
FUNCT10N SELECTOR to MO~OPHONIC
TUNER, AUX.
Use the BASS and TREBLE controls as described previous
I y.
LISTENING TO A STEREOPHONIC SOURCE CONNECT-
ED TO AUXILIARY Al and
A2, AUXILIARY B1 and B2,
AM and FM, FM and FM MULTIPLEX: Set the INPUT
SELECTOR to AUX A,
AUX B, AM-FM, or FM-MUL TI
respectively. Set the
FUNCTION SELECTOR
at STEREO
NORMAL or STEREO REVERSE. The FOCUS, BASS and
TREBLE controls are set as described previously.
MAKING
RECORDINGS: Tape recordings may be made
by connecting the recorder to the
TAPE OUTPUT jacks.
See "TAPE OUTPUT 1,
TAPE OUTPUT 2" under ELEC-
TRICAL INSTALLATION. Please
note that recordings
cannot be made on tape decks
unless those decks are
equipped with the electronics required for recording.
FUNCTION SELECTOR: The STEREO NORMAL and STER-
EO REVERSE positions
are both used for stereophonic re-
production. At the
STEREO REVERSE
position, the chan-
nel 1 and channel 2 amplifiers from the tone controls to
the speaker connections are interchanged.
These two
positions permit interchanging the signals fed to the two
speakers so that the correct
left to right display of the
orchestra can be achieved on all recordings or broadcasts.
The CHECK AMPL. 1 and CHECK AMPL. 2 positions per-
mit hearing either channell alone or
channel 2 alone for
comparison or balancing purposes during stereophoni
c use.
The MONOPHONIC TUNER, AUX position is used for
monophonic FM, AM, tv
sound)' monophonic phono
cart-
ridge monophonic pre-
amplified tape etc., fed into chan-
nel 1 inputs. At this
position)' the channel 2 inputs which
are unused in this type of operation, are disconnected
from t
he active channel so that they cannot
contribute
interference. At the MONOPHONIC PHONO
position,
the channell and 2
corresponding inputs are mixed
, which
is useful when playing monophonic records with
a stereo-
phonic cartridge to cancel vertical rumble
components.
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