Eico HF-20 - Operation Instructions

If
It It
detlred
to use two
similar
or Identical
full-range
speakenof
the
tame
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
Impedance
.(
It
maybe
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
(woofer-
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
shielded
lead
from
your
phono-
graph
should
be
provided
with
a
shielded
"phono-type"
plug.
The
Input
(aek
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,
Pickering,
Fair-
child,
Recoton,
Electrosonic
& transformer:
Connect
to
PHONO
INPUT
1
.
Weathers
FM
Capacitance
pickup:
Alternative
1
—Use
Weathers
Adaptor
PlugModel
P'631
and
connect
PHONO
INPUT
2.
Alternative 2
—
Cut the
Jumper
shorting
the
47mmfcapa-
citor
coming
off
PHONO
INPUT
1
fack
Inside
the
chassis
(Identified
by red
tape
In wired
units).
Connect
from
the
"constant
amplitude”
output
of
the
Weathers
oscillator
unit to
PHONO
INPUT
1
.
Audak,
Ronette
TO-284P;
Ferranti
&
transformer:
Con-
nect
to PHONO
INPUT
2.
Ceramic
or
crystal
cartridges
that
equalize
for
RIAA
curve.
Use
Electro-Voice
Adaptor
Model
504
and
connect
to
PHONO
INPUT
2.
If
an
adaptor
such
as
the
Electro-Voice
Model
504
Is not
used,
a
crystal
or
ceramic
cartridge
may
be
connected
to
the
AUX.
INPUT.
The
equalizer-preamplifier
circuit
Is
not
effective
In this
case.
e)
HIGH
LEVEL
INPUTS—
Four
high
level
Input
|acks
designated
as
Tuner,
TV,
Tape,
and
Auxiliary
are
pro-
vided
for
connectlonof
tuners,
tv
receivers,
tape
recorder
playback,
and
ordinary
or
RIAA
equalizing
crystal
or
cera-
mic
phono
cartridges
without
adaptor.
A
shielded
cable
with
a
shielded
"phono-type"
plug
should
be
used
to
con-
nect
each'of
these
sources
to
the
corresponding
amplifier
Input
jack.
Unless
the
source
has
a
low—
Impedance
out-
put
such
as
a
cathode
fol
lower
(with
which
up
to
50 ft.
of
cable
can
be
used),
use
the
shortest
possible
connection
ana
low,
capacity
shielded
cable
(cable
having
as
low
as
25mmfd
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
record!
ng
on
your
phonograph
and
turn
up
the
level
control
to
obtain
on
ordinary
listening
level.
Without
touching
the
LEVEL
or
LOUDNESS
controls,
turn
the
SELECTOR
to
TUNER
and
ad|ust
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
theotherhlgh
level
Inputs,
the
Independent
LEVEL
control
on the
front
panel
of
the
amplifier
permits
adjust-
ment
of
the
level
when
changing
Inputs.
c)
TAPE
OUTPUT:
A
shielded
cable
(up to
30
ft.
may
be
used)
wlthashtelded
"phono-type"
plug
should
be
used
to
connect
from
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
INPUT
1 and
PHONO
INPUT
2
are
of
course
equalized
according
to the
equalization
selected
and
all
Inputs are
affected
by
the
level
and tone
controls.
The
loudness
control
does
not
affect
the
tape
output
and
permits
adfustmentof
the
listening
level
while
recording.
d)
POWER
CONNECTIONS:
The
power cord
of
the
turntable
and
tuner
may
be
Inserted
In the
convenience
outlets
provided
mi
the
rear
chassis
apron.
Thereeeptaele
marked
"PHONO*
9
provides
110
volts
AC
regardless
of
whether
the
power
switch
of
the
amplifier
Is
turned
on or
off
In
order
to
protect
the
turntable
mechanism
. The
receptacle
marked
"TUNER"
ts "live"
or
"dead"
depend-
ing
on
whether
theamplifler
power
switch
Is turned
on
or
off.
3.
HUM
ADJUSTMENT
a)
After
checking
the
amplifier
for
proper
operation,
remove
all
Input
cables
to
the
amplifier
and
make
the
fol
lowing
control
settings
which
hold
throughout
the
pro-
cess
of
hum
adjustment:
SELECTOR
at
RIAA,
LEVEL
&
LOUDNESS
to
10,
TREBLE
control
at
"5, BASS
control
at
0.
Next
precede
as
fol
lows:
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
an
re-
Insert
It
with
the
prongs
reversed
and
listen
again.
Choose
the
prong
position
which
gives
the
least
hum.
Now
connect
the
tuner
Input
connector
to
the
am-
plifier
TUNER
Input
jack,
and
with
toner
set
between
stations
and
the
toner
volume
control
set
at
minimum,
do
the
same
with
the
power
plug
of
the
toner,
using
the
TUNER
convenience
outlet
on
the
amplifier
If
desired.
Finallyconnect
the
phono
Input
connector
to
theamplifler
PHONO
1
or
PHONO
2
Input
as
Is
required
(turntable
off
and
pickup
arm
at
rest
position)
and
do
the
same
with
the
power
plug
of
the
turntable,
using
the
PHONO
con-
venience
outlet
on
the
amplifier
If
desired.
When
ail
of
this
Is
completed,
adjust
the
hum
balance
control
on
top
of the
amplifier
chassis
for
least
hum.