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 the 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.
