Eico HF-20 - Page 14

REAR
PANEL
WIRING
(
)
Fig.
4.
Connect
a
33K 20%
resistor,
R40,
from
J5“2 (C)
to
TB1
(C).
( )
Fig.
4.
Connect
a
2"
black
lead from
J5”2
(S)
to
J6“2
(C).
( )
Fig.
4.
Connect
a
47mmf
capacitor, C22,
from
J5“1
(C)
to TB1 (C).
(
)
Fig.
4.
Connect
a
piece
of
bare
wire
from
J5”l (S)
to
TB1
(C).
(
)
Fig.
4.
Connect
a
68K 20%
resistor,
R39,
from
J6-1 (S)
to
TB1
(C).
( )
Fig.
4.
Cot a
7"
piece of
shielded
cable.
On
both
ends, the
outer
in*
sulation
is stripped
back
T",
the
braided
shield
is
stripped
back 3/4"
and
the
inner
Insulation
is
stripped
back
3/8"
. Wrap
one
turn
of
a
3"
piece
of
bare
wire
around
each
end
of
the
braided
shield
and
solder.
Connect
the
inner
lead
of
one
end
to
TB1 (S),
and
the
inner lead
of
the other
end to
XV1“7
(S).
Connect
the
bare
wire
at
one
end
(covered
with
spaghetti)
to
J6“2 (S),
and
the other
bare
wire
to
ground
lug
"A"
(C).
(
)
Fig.
4.
Mount
the
switch, Si
,
as
shown.
Use
two
3/8"
nuts,
one 3/B"
lockwasher
and
one
3/8"
flotwasher
(Fig.
3).
>4
(
)
Fig.
4.
Connect
the
bare
wire
from
Sl“8F
h> J3”2
(S).
(
)
Fig.
4.
Connect
thefour
ends
"A”
of
the
shielded
cablesfromSI
as fel-
lows:
IF
to
J3“1
(S)
HFtoJl-l(S)
2F
to
J4-1
(S)
12F
to
J2-1 (S).
(
)
Fig.
4.
Connect
the
black
lead
from
the
output
transformer,
T2, to
TB3“
(
)
Fig.
4.
Connect
the
slate
lead
from
T2
to
TB3-2
(S).
(
)
Fig.
4.
Connect
the
green
lead
from
T2
to
TB3-3
(S).
(
)
Fig.
4.
Connect
the
yellow
lead
from
T2
to
T83”4
(C).
(
)
Fig.
4.
Connect
one
end
of
a
bare
wire
to
TB3~1
(S). Pass the
other
end
thru
XV5-1
(C)
and
Connect
to
ground lug
“B" (S)
on
XV5.
(
)
Fig.
4.
Connect
a
10K resistor,
R32
and
a
lOOmmf
capacitor.
C16,
from
TB3-4
(S)
to TB2
(C).
( )
Fig.
4.
Connect
an
10"
black
lead
fromTB2
(S)
to
XV8-3
(C).
Run
the
lead
along
the
chassis
as
shown.
PRE-AMPLIFIER
WIRING
(
)
Fig. 4.
Connect
a
1.138K
resistor,
R41,
from
XVI
“8
(C) to
ground
lug
"A"
(S).
(
)
Fig.
4.
Connect
the blue
lead
from S1-12C to
XVI
“8
(S).
(
)
Fig.
4.
Run the
free
end
of C25
under
R4I and
connect to
XV1“1
(C).
The
capacitor
should
be
perpendicular to the
chassis.
Use spaghetti.
(
)
Fig.
4.
Connect
a
117.7K resistor,
R44,
from
XV1-1
(S)
to TB5”1
(S).
(
)
Fig. 4.
Connect
a
375K
resistor,
R45,
from
XV1“2
(C) to
TB5“2
(C).
( )
Fig.
4.
Connect a
200K
resistor,
R42,
from
XV1-6
(C)
to TB5“3
(S).
(
)
Fig.
4.
Connect
a
.02mfd
GMV
capacitor,
C23,
from
XV1“6
(S) to
XV1“2
(S).
Use
spaghetti.
(
)
Fig.
4.
Connect
a
2.4K resistor,
R46,
anda
lOmfd
capacitor,
C24,
from
XVI
-3
(S)
toTB5”2
(C).
Note
that
the
negative
lead
goes
to
ground (TB5“2).
(
)
Fig.
4.
Connect
a
short
piece
of
bare
wire
covered
with
spaghetti
from
the
center
shield
post
of
XVI
(S)
to
TB5-2
(S).
(
)
Fig.
4.
Connect
a
56K
resistor,
R1,
from
R2“l
(S)
to
TB6“2
(C).
(
)
Fig.
4.
Connect
the
free
end
of
the
inner
wire of
the
shielded
cabl
e on
S1-10E
to
TB6~2
(S).
Cover
the
bare
wire
soldered
to the
braided
shield
with
spaghetti
and
connect
to
R2~3
(C).
Run
lead
away
from
chassis.
TONE
CONTROL
CIRCUIT
( )
Fig.
4.
Connect
a
330K
resistor,
R3,
from
TB6-1
(C) to
R2-2
(C).
( )
Fig.
4.
Connect
a
.25mfd
capacitor.
Cl,
from
TB6-1
(S) to
XV2-1
(C).
Use
spaghetti
on
both ends.
( )
Fig.
4.
Connect
a
8"
green
lead
from
R2-2
(S) to
XV2-2
(S).
Run
wire
In
the
bend of
the
chassis.
(
)
Fig.
4.
Connect
a
4"
black
lead
from
R2~3
(S)
to
R14-3
(C).
( )
Fig.
4.
Connect
a
2200mmf
capacitor,
C4,
from
R7"l
(C)
to
R7-2
(C).
( )
Fig.
4.
Connect
a
68K
5%
resistor, R6, from
R7-1
(S)
to
R10-1
(C).
Use
spaghetti
on
both
ends*