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electrical
installation
GENERAL
a)
SPEAKER
CONNECTIONS:
To
connect your speaker
to
the amplifier properly,
you must
know
its
rated
imped-
ance.
This
may
be
read off the speaker
nameplate.
Con-
nect
one
speaker
lead
to
the terminal
on
the rear
apron
marked
"G"
and
the other
speaker lead
to
the
nearby
ter-
minal designated
by
the rated
speaker
impedance
(4, 8,
or 16
ohms).
Plastic-covered
lamp
cord
may
be
used
for
distances
up
to
50ft, with
little
power
loss.
For shorter
distances,
TV
antenna
lead
can be
used, particularly
if
it is
desired
to
run the
speaker
lead
under
a
rug.
If it
is
desired
to
use
two
similar or identical full-range
speakers of the
same
rated
Impedance
(either
8
or 16
ohms
only)
for
better
sound
distribution,
connect one
speaker
lead of
each
pair
to
"G"
and
the
two remaining
leads
to
the terminal
with a
number
equal
to
half of
one
of the
speaker's rated
i
mpedance
.
(I
t
may
be
necessary
to
"
phase"
the
two
speakers
by
reversing both of the leads
from
one
of the speakers.)
This
may
not
be done
if
each
of
the
speakers
is
designed
for
reproduction of a
different part
of the
audio spectrUm (woofet-tweeter combinations)
in
which
case a cross-over
network
is
required
which con-
nects
to
the amplifier
with only
one
pair of leads.
b)
PHONO
INPUT:
The
shield lead
from your
phono-
graph should be provided with a shielded "phono-type"
plug.
The
input jack
on
the amplifier
into
which
this
plug should
be
inserted
depends on
the type of cartridge
employed.
Specific
instructions
follow.
GE
Variable Reluctance
or Professional,
Audak,
Recoton,
Electrosonic
&
transformer, Fairchild
&
transformer,
Elec-
tro-Voice
84SM: Connect
to
LO
phono
input.
All Pickering,
Miracord, Fentone, Weathers
&
Adaptor
plug P631 (Wedthers)i
Connect
to
HI
phono
input.
Sonotone3Por3T,
Electro-Voice
EV84S,
or
anyhigh qua-
lity
ceramic
or
crystal
cartrldgeself-equalizing
as
per the
RIAA
curve;
Connect
to
AUXillary phono
input.
Note
that the
equalizer preamplifier
circuit
is
not effective
in
this
case.
c)
HIGH
LEVEL INPUTS:
Four high
level
input jacks
des-
ignated
as
Tuner,
TV, Tape, and
Auxiliary are provided
for
connection
of
tuners,
W
receivers,
tape recorded
playback,
and
ordinary or
RIAA
equalizing
crystal
or
ceramic
phono
cartridges
without adaptor.
A
shielded cable
witha
shield-
ed "phono-type"
plug should
be
used
to
connect each
of
these sources
to
the corresponding amplifier input jack.
Unless the source has
a low-impedance
output such
as
a
cathode
follower
(with
which up
to
50ft. of cable
can be
used), use the shortest possible
connection and low capacity
shielded coble (cable
having
as
low
as
25
mmfd
capacitance
per
foot
is
available).
If
the tuner
employed
has
a
volume
control
to
adjust the
output,
set
this
control as follows.
Turn the amplifier
LEVEL
control
to
minimum
and
the
LOUDNESS
control
to
maximum.
Play
any
recording
on your phonograph and
turn
up
the
level control to
obtain
an
ordinary
listening level.
Without
touching
the
LEVEL
or
LOUDNESS
controls, turn
the
SELECTOR
to
TUNER
and
adjust the
volume
control
on
the tuner
to
obtain approximately the
same
loudness
level as
was
obtained from
the recording.
In
the
case
where
the tuner has
no
output
level control
and
also In the
case
of the other high
level inputs,
the
independenfLEV
EL
con-
trol
on
the front
panel
of the amplifier permits
adjustment
of the
level
when
changing
inputs.
c)
TAPE
OUTPUT:
A
shielded
cable
(up
to
50ft.
may
be
used)
with a
shielded
"phono-type"
plug should
be
used
toconnectfrom
the
TAPE
OUTPUT
jack
to
the Input of the
tape recorder.
Any
input
chosen
by
the
SELECTOR
is
fed
out
to
the tape recorder through
this
jack.
Phono
inputs
fed
In
at
PHONO
LOand
PHONO
HI are of course
equa-
lized
according
to
the equalization selected but
none
of
the inputs are affected
by
the level, loudness,
and
tone
controls.
d)
POWER CONNECTIONS:
The power cordof
the turn-
table
and
tuner
may
be
inserted
in
the
convenience
out-
lets
provided
on
the rear chassis
apron.
The
receptacle
marked
n7VAC
is
Intended
for
use
primarilywitha
phono-
graph
and
provides
117
VAC
regardless of
whether
the
power
switch of the amplifier
Is
turned
on
or
off
In
order
to
protect the
phonograph mechanism.
The
receptacle
morked
117
VAC
Switched 150
watts
is
"live" or
"dead"
depending on whether
the amplifier
powerswitch
is
turned
on
or
off
and
is
Intended
primarily
for
use
with
tuners.
Equipment drawing
in
excess of
150
watts should not be
plugged
into
this
outlet.
HUM
ADJUSTMENT
a)
After
checking
the amplifier
for
proper operation,
re-
move
all
input cables
to
the
omp
i
if
ier
and
make
the
foil
ow-
ing control settings
which
hold throughout the process
of
hum
adjustment;
SELECTOR
at
RIAA,
LEVEL&
LOUDNESS
to
10,
TREBLE
control at
"5,
BASS
control at
0.
Next
procede
os follows;
With
your ear held
close
to
the speaker.
Insert
the amplifier
power
plug
into
the wall outlet
and
listen to
the
hum
level.
Now
pull
out
the
plug
and
re-
insert
it
with
the prongs reversed
and
listen
again.
Choose
the
prong
position
which
gives the
least
hum.
Now
con-
nect
the tuner Input
connector
to
the amplifier input jack,
and
with
tuner
set
between
stations
and
the tuner
volume
control set a
minimum,
do
the
same
with
the
power
plug
of
the tuner, using the
117
VAC SW
convenience
outlet
on
the amplifier
if
desired. Finally
connect
the
phono
input
connector
to
the amplifier
PHONO
LO
or
PHONO
HI
in-
put
as
is
required
(turntable off
and pickup arm
at
rest
po-
sition)
and do
the
same
with
the
power
plug of the
turntable,
using the
117VAC
convenience
outlet
on
the amplifier
if
desired.
When
all
of
this
is
completed,
adjust the
hum
balance
control
on
top of the amplifier
chassis for least
hum.
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