Specifications
CH.I
HIGH
LEVEL
INPUTS
CH.I
TAPE
OUT
1-
__
SPEAKER
CH I
CH.I
LOW
LEVEL
INPUTS
FIG.1f
MONOPHONIC
TUNER,
TAPE, TV
SEP
1---_
SPEAKER
CH.2
CH.2
TAPE
OUT
CH. I HIGH
LEVEL
INPUTS
CH. I
TAPE
OUT
I--
__
SPEAKER
CH. I
CH. I
LOW
LEVEL
INPUTS
FIG. 19
MONOPHONIC
PHONO
CH.2
LOW
LEVEL
INPUTS
~SEP.,
•
CH.2
CH.2 HIGH CH.2
LEVEL
INPUTS
T
APE
OUT
SERVICE
SEL
I
POWER
AMP
If-
__
SPEAKER
CH.2.
• CH.2
*
On
integrated
amplifiers HF20, HF32
feed
into
TAPt
OUTPUT [eekj en HF52
r
feed
into ELECTRONIC CROSS-
OVER INPUT
jack,
after
severing
connection
between
ELECTRONIC CROSSOVER IN
and
OUT
jacks.
FIG. 20.
SPEAKER
&
EXTERNAL
SIGNAL
CONNECTIONS.
G4
CH
.I
32 16 8
CH
.2
4 G
~_~
__
~
~
p(J)
.- - - - - - - - - - - - - - I
I
,
I
I
. I
::11
:Q
itl
'"
"'I
~
0,
o
""I
co I
1
I
I
32 16
-'
'- -- --
--
- '1
EXTERNAL
BASIC
POWER
AMPLIFI
ER
'
~I
~,
~I
1 -
o
TAP!:
OUT
"INPUT
2
b) INTERNAL POWER
AMPLIFIERS
COMBINED (TIED
TOGETHER AT
THE
INPUTS AND
PARALLELED
AT
THE
OUTPUTS)TO
DRIVE
ONE
SPEAKER
OF A
STEREO
PAIR.
This
arrangement
is
employedwhen
the
useralready
has a
high
quality
amplifier
(usually
20watts
or more if
it
is to
be worthwhile) which he desire to
include
in
the
system.
The
oreamo-tone
control combination
including
the
reg-
ltie preamp-Tone
conrroi
COmOlnUJlUlI
11I"'IU\,llll~
"""
'''''l:f-
ular
CHI
·tone
control feeds
the
combined
internal
power
amplifiers;
the
preamp-tone
control combination
including
.
the
regular
CH2
tone
control feeds
out
through
the
CH2
TAPE
OUT
jack
to an
external
power
amplifier.
The SER-
VICE
SELECTOR
switch on
the
chassis must be
set
at
the
COMbined
position for this
service
in
order
to
disconnect
the
input
of
the
CH2
power
amplifier
from
the
output
of
the
CH2
tone
control
and
connects
it
instead to
the
input
of
the
CH1 power
amplifier
. The CHI
and
CH2
power
amplifiers
are
paralleled
at
the
outputs,
as shown, by an
external
jumper
connected
between
corresponding
speaker
connection
taps . The
external
signal
connection
and
the
speaker
connections
are
shown in Fig. Zc, The internal
arrangements in the HF-81
at
each
of
the
positions
of
the
FUNCTION
selector
are
shown in Figs. 2b, 2c, 2d, 2e,
2f,
and
2g, as an
aid
to understanding the
operation
with
this' arrangement.
CH.I
HIGH
LEVEL
INPUTS
CH.I
TAPE
OUT
FIG.2b
CHECK AMPL. 1
CH.I
LOW
LEVEL
INPUTS
SPEAKER
CH.I
5