Eico HF-81 User Manual page 5

electrical installation
The HF-
81 can be used in two ways
for a stereophonic
system. In all cases, plug
monophonic sources and one
track of monophonic/stereophonic sources in the channel
1 inputs; plug the other track of stereo sources in the
chan-
nel 2 inputs. It is assumed in what follows that a stereo-
phonic phono cartridge is being used. Monophonic phono
refers to playback of a monophonic recording with a stereo-
phonic cartridge.
CH.
32
16 8
CH.
32
(J) (J) (f)
(J)
TO MATCHING
TAP
TO MATCHING
TAP
a) INTERNAL
POWER AMPLIFIERS OPERATED SEPARATE-
LY, EACH DRIVING ONE SPEAKER OF A STEREO PAIR.
This arrangement is used when there is no other amplifier
the user desires to include in
the system. The
SERVICE
SEL. sl ide
switch on top of the chassis must be set
to SEP-
arate. Signal connections are
all internal, so only
the
speaker connection need to shown (Fig.
la, rear chassis
view). The internal arrangement ion in the HF- 81 at each
of the positions of the FUNCTION selector are
shown in
Figs. Ib, lc, Id , Ie, If , and 19, as an aid to
understand-
ing the operation with this arrangement.
SPKR. SPKR.
FIG. la. SPEAKER
CONNECTIONS
FIG.
CHECK AMPL. 1
CH.
I LOW
LEVEL INPUTS
CH. 1 HIGH
CH. 1
LEVEL INPUTS
TAPE OUT
IPREAMP~
CH.
CH.
POWER AMP
SPEAKER
CH.
CH.
FIG.
CHECK AMPL. 2
CH.
2 LOW
LEVEL INPUTS
PREAMP
CH. CH.
CH.
2HIGH CH.
LEVEL INPUTS
T APE OUT
POWER AMP
SPEAKER
CH.
CH.
CH. 1 HIGH
LEVEL INPUTS
CH.
TAPE OUT
CH. 1 LOW
LEVEL INPUTS
SPEAKER
CH.
FIG. Id
STEREO NORMAL
CH.
2 LOW
LEVEL INPUTS
SERVICE SEL.
~:'~P
SEP ..
I PO
AMP
~~~~R
CH.
2 HIGH CH.
LEVEL INPUTS
TAPE OUT
CH. 1 HIGH
LEVEL INPUTS
CH.
TAPE OUT
CH. 2 LOW
LEVEL INPUTS
SPEAKER
CH.
CH. 1 LOW
LEVEL INPUTS
FIG. Ie
STEREO REVERSE
SEP
SPEAKER
CH.
CH. 2 HIGH
LEVEL INPUTS
CH.
TAPE OUT