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HOW TO CONNECT
@ Basic Connection
This amplifier is so-called pre-main amplifier composed by
pre-amplifier section which
controls playback equipments
and power amplifier section which amplifiers the signal to
the extent that it drives the speaker systems. It functions as
the stereophonic reproduction system when player, tuner,
etc. are connected to the input terminals and speakers or
headphone
to the output terminals. Thus it is basically
necessary to connect this amplifier with the input sources,
outputs loads and naturally mains current.
§@ Connection to Input Terminals
Connect at the relevant input terminals of this amplifier the
output of player, tuner, or tape-recorder. As to the details
see the
chapters of Playback
of Disc, Tuner
and Tape-
Recorder.
™ Connection Cable (Cord Wire)
For
connection
of these
record-player,
tuner and tape-
recorder
shield wire is used for protection from external
noise or inductance noise. Usually this shield wire has the
capacitance
of
approx.
300pF/M,
that
is to
say,
an
adoption of connection cable gives the same effect to that
of the insertion of capacitor tn parallel with input sources
or output
load
equipments,
which
composes
a kind of
high-cut filter circuit. For instance 2 meters of this shield
wire has GOO0pF capacitance, and if this cord is used at the
point where parallel composite value of input and output
inpedance is 50K, it means an insertion of a high cut filter
with the cut-off frequency at about 10KHz, which causes
to yield
an
unnecessary
attenuation
of high frequency
range.
Use of shortest wire is, therefore, recommended
especially on the equipments of high impedance.
Choose a shield wire of good quality and use it as short as
possible for connection
of this amplifier at the PHONO,
AUX, tape-monitor, tape connector etc, with the apparatus
of high impedance.
In case either of input or output ts
sufficiently
low it does not effect much, since parallel
composite impedance becomes lower and cut-off frequency
will be shifted out of an audible range. It does not matter if
relatively long cable is used for pre-amplifier section output
and recording output
(REC. OUT)
terminals, since their
impedance is so designed .as to be sufficiently low (approx.
10022).
#
Connection of Speakers
|
Stereophonic
playback
is made
with
a pair of speaker
systems for right channel and left channel. This amplifier is
provided with 2 channels' terminals for main speakers and
'remote
speakers.
Connection
can
be made
in the same
manner.
Right hand
speaker system
(viewed from
the
listener's position) should be connected to the right speaker
terminals, while left speaker system to the left terminats.
Note that perfect sound reproduction cannot be expected if
the phase is not matched between both channels. To match
the phase is to connect the + terminal of the right hand
speaker to + terminal
(red cap) in right channel of this
amplifier and the — terminal to — one (black cap), and to
do the same with left channel speaker. If mismatched for
some reasons (for example misconnection of speakers) low
frequency range is subdued and constant playback cannot
be realized.
To connect the speaker terminals first strip off the end of
shield wire by 10mm
and
insert
it to the terminal hole
pressing the terminal head, and then release it. You will
find firm connection has been finished. After connection of
the speaker systems, turn the speaker switch
on to the
corresponding speaker systems to which the terminals are
connected.
Comparative
listening
is possible
between
2
pairs of
(remote
and
main)
speaker
systems,
if it is
connected for both channels.
™ Connection of Mains Power Supply Source
As the final step of preparation connect the amplifier to the
mains power supply source. Attached mains cord should be
connected to the mains power supply source. Then press
the mains switch and the pilot lamp starts to light up and
the amplifier will be on function in about 2 — 3 seconds.
The
mains
power
for
other
audio
equipment
used
in
combination with this amplifier can be obtained from the
extra mains outlet of the amplifier.
BA
RIGHT
SPEAKER
SYSTEM
Hy
aa
——_-
L
~<
PLAYBACK
ed
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