Eico HF-89 - Interconnection of Components; Signal Input Connections; Output Connections

However,
theHF-89
outlets
may
be
used
also, if
desired,
in
which
case
both
of
them
will
be
"switched".
INTERCONNECTION
OF
COMPONENTS:
SIGNAL
All input
connections
are
to
be
made
using
single
conduc-
tor
shielded
cable.
Unless
the
source
has
alow
impedance
output,
such
as
a
cathode
follower
(withwhich up
to 50
ft.
of
cable
can
be
used),
use
the
shortest
possible
connec-
tion.
In
any
case,
use
a low
capacity
type
of
shielded
cable
(as
low
as
25mmf
capacity
per
foot is
available).
Both
ends
of the
cable
must
be
fitted
with
RCA
type
phono
plug
connectors.
For
speaker
connections,
use
plastic
covered
lamp
cord
or
flat
ribbon
twin
lead.
(la,
lb,
lc
below
are
possible
input
connections)
la)
STEREO
CONTROL
PREAMPLIFIER
TO
HF-89
DUAL
POWER
AMPLIFIER:
Use
two
cables
as
described
above.
Connect
one
cable
from
preamplifier
output
1 to
input
1
on
the
HF-89.
Connect
another
from
preamplifier
output
2 to
input
2 on
the HF-89.
Set the
Service
Sel
switch
at
the
SEPARATE
position.
Power
amplifier
can
deliver
50watts
per
channel.
DO
NOT
use
dual
conductorshield-
ed
lead.
lb)
MONAURAL
CONTROL
PREAMP
TO
HF-89
DUAL
POWER
AMPLIFIER:
Use
one
cable
as
described
above.
Connect
this
cable
from
the
preamplifier
output
to
input
2 on
the
HF-89.
Put
the
Service
Sel
switch
into
the
COMBINED
position.
The
power
amplifiers
can
deliver
a
total
of 100
watts
to
the
speaker.
lc)
USING
YOUR
OLD
AMPLIFIER:
You
can
use
your
old
power
amplifier
or
integrated
amplifier
for
one
stereo
channel,
and
the
HF-89
connected
for
parallel
operation
of
the
dual
amplifiers
for
the
secondstereo
channel.
This
may
be
worthwhile
only
if
your
old
amplifier
has a
rated
power
output
of
at
least
50
watts.
Connect
one
cable
from
stereo
preamp
output
1 to
input
2
of
the HF-89
and
set
the
Service
Sel
switch
at the
COMBINED
position.
With
the
speaker
connection
terminals
of
the
dual
ampli-
fiers
connected
in
parallel,
the
HF-89
can
deliver
100
watts
to
the
speaker
in
stereo
channel 1.
Connect
another
cable
from
stereo
preamp
output
2
to
input
of
your
old
power
amplifier
or to
the
tuner
or
auxiliary
input
of your
old
integrated
amplifier.
(In
the
latter
case, set
the
tone
controls
of
the
old
amplifier
to
"flat"
and
loudness
contour
or
filter
controls
to
no
effect).
The
power
capability
of
the
second
channel
will
then
be
the
same
as
that
of
your
old
amplifier.
(2a,
2b, 2c,
2d
below
are
possible
output
connections)
2a)
In
the
situation
described
in
la
above,
for
stereo
operation
connect
one
speaker
system
between
"G"
and
the
appropriate
impedance
tap on
the
speaker
connection
terminal
board
for
amplifier 1.
Similarly,
connect
the
appropriate
impedance tap on
the
speaker connection
board
for
amplifier 2. If you
have
only
one
speaker
system
at
this
time,
and wish
to use
the
power of
both
amplifiers
combined
to
drive it, then
use
the
parallel
operation
connection
described in
2d below.
2b) In
the
situation
described in
lb
above,
if
you
have
two
speaker
systems connect
one
to each
speaker
connec-
tion
terminal
board
(one for
each
amplifier) just
as
de-
scribedin
2a above.
If you
have only
one
speaker
system,
use
the
parallel
operation
connection
described in
2d
below.
2c)
In
the
situation
described
in
lc
above, it is
implied
that you
have
two
speaker
systems.
Connect
one
speaker
system to
your
old
amplifier
and
the
second
speaker
system
to theHF-89
dual
power
amplifiers
connected in
parallel
as described in
2d
below.
2d)
Parallel
operation
of theHF-89
dual power
amplifiers
with
full 100
watts
output
is
possible
for
speaker
upto 8
ohms
impedance:
First
determine
the
rated
impedance
of
the
speaker
system
to
be
connected
to the
paralleled
am-
plifiers
and
multiply
it
by
two.
Locate
the
connection
terminals on
each
of the
two
speaker
connection
terminal
boards on
the
HF-89
assigned
to
the
tap
of this
value.
Connect
an
external
jumper
wire
between
this
particular
pair
of
terminals
(16
to
16
for
an
8Clspeaker,
or8to
3
for
a 40
speaker).
Finally,
connect
the
speaker
between
one
of the "G"
terminals
and one
of the
pair
of
terminals
connected
together
by
the
jumper
wire.
CONTROL
ADJUSTMENTS
a) TheINPUT
LEVEL
ADJ.
controls
are
intended
to pro-
tect
the
speaker
system
from
"blasting"
should
someone
turn
the
preamplifier-control
unit
level
controls
to
full.
It
permits
you to
attenuate
the
preamplifier
output
signal
by
the
desired
amount
at
the input
to
the
power
amplifier
where
it
can
not
be
"fiddled"
with.
Start
by
setting
the
INPUT
LEVEL
control
to
the
maximum
counter-clockwise
(maximum
attenuation)
position
using
a
screwdriver.
Set
the
LEVEL
control on
one
channel
of
the
preamplifier
at
the
midpoint
of its
range
of
rotation.
Turn
your
phono-
graph
on
and
play an
average
orchestral
record.
Then
slowly
rotate
the
appropriate
INPUT
LEVEL
ADJ.
control
clockwise
until
the
music
isatnormal
(or
concert)
listen-
ing
level.
Repeat
for the
second
channel.
This
completes
the
adjustment.
b)
ON-OFF
SWITCH:
Should
be
set
at the
ON
position
when
the
unit
is
used
with
a
preamplifier.
It
may be
used
as
apower
on-off
switch
when
the
amplifier is
accessible.
3