Dynatuner FMX-3 Assembly instructions
SERIAL
NUMBER
This
number
must
be
men-
tioned
in all communications
concerning
this
equipment.
INSTRUCTI
NS
FOR
ASSEMBLY
ALIGNMENT
OPERATION
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Price $1.00
929011
tJlUI\IaCD
il\lc_
3060
Jefferson
St.,
Philadelphia,
Pa.19121
U.S.A.
FMX-3
MULTIPLEX
INTEGRATOR
•
•
•
DESCRIPTION
The
Dynatuner
FMX-3
is a
multiplex
integrator
designed
to
convert
the
FM-l
Dynatuner
into
a
compatible
FM-
Stereo-Mono
tuner.
When
installed
and
aligned,
the
com-
pleted
system
exhibits
specifications which
are
virtually
unchanged
from those of
the
basic
tuner.
Separation
of
the
two
stereo
channels
is
30
db
or
more
over
the
useable
audio
range, closely
approaching
the
limits
of
the
system,
and
the
Dynatuner
FMX-3
is
uniquely
able
to
maintain
this
high
degree
of
separation
even
with very low signal
strengths.
The
FMX-3
has
some novel
features
which
contribute
to
ease of
operation
as
well
as
a
high
level of
performance.
The
FMX-3
has
three
basic
sections:
1. A
19KC
and
doubler
channel
using
a
6BL8/
ECF80
tube,
in
which
the
pilot
signal of
the
stereo
broadcast
is
amplified
and
doubled
to
reconstruct
the
38KC
carrier.
2.
A
symmetrical
gated
bridge
detector
utilizing
4
matched
IN541
germanium
diodes
which
detect
the
signal.
3. A
twin
triode
12AX7jECC83
tube
which
am-
plifies
the
signal.
This
stage
is afeedback
stage,
providing
alow
output
impedance
with
low
distortion.
When
there
is a
stereo
broadcast,
the
doubler
circuit
produces
from
the
tran.smitted
19KC
stereo
pilot
signal, a
38KC
signal
which is locked
in
phase
with
the
pilot
signal.
This
38KC
signal
is
amplitude
controlled
by
a
limiter
to
reject
AM
noise
and
to
maintain
a
constant
carrier
level.
The
doubler
circuit
also
provides
a
signal
for
actuating
the
STEREOCATOR
to
indicate
the
existence
of a
stereo
broadcast.
The
same
STEREOCATOR
is
used
as
an
alignment
indicator
when
initially
adjusting
the
integrator.
The
reconstituted
38KC
carrier
is
combined
with
the
detected
FM
signal
in
a
special
balanced
transformer.
This
signal
has
been modified
by
augmenting
the
portion
which
contains
stereo
information
and
by
introducing
a
notch
type
filter
at
67KC
in
order
to
eliminate
problems
from
stations
with
subsidiary
non-stereo
multiplex
operation.
The
combination
of
the
38KC
carrier
and
detected
FM
signal
has
an
envelope
on which
one
side
is left
channel
and
the
other
side
is
right
channel
modulation.
Each
chan-
nel
is
detected
by
half
the
balanced
bridge
in which
the
arms
alternately
open
and
close,
actuated
synchronously
by
the
38KC
signal.
Balanced
detection
insures
linearity.
The
demodulated
signals
are
de-emphasized.
They
pass
through
a
dual
volume
control
which
handles
both
chan·
nels,
and
then
are
amplified in
the
output
stage
where
the
unwanted
signal
portions
above
the
audio
spectrum
are
fil-
tered
out.
The
resultant
output
contains
very
small
per-
centages
of
38KC
and
its
harmonics
so
that
there
are
no
signals to
cause
spurious
beats
with
tape
recorder
bias
frequencies.
There
are
two
very
important
benefits from
this
system.
First,
its
very
high
degree
of
linearity
provides
minimum
distortion.
This
results
in
stereo
reception
of a
quality
commensurate
with
the
finest
mono
broadcasts,
plus
all
the
benefits
of
excellent
stereo
separation.
Second,
there
is
no
switching
required
of
the
user
in
the
transition
from
mono
to
stereo
or
vice versa.
The
integrator
takes
care
of tllis
automaticallY since
the
38KC
carrier
does
not
exist
in
the
absence
of t'he
19KC
stereo
pilot
signal,
and
there
is
no
free-running
oscillator
to
cause
beats
and
whistles
which
might
be
encountered
under
many
conditions
of lise.
The
integrator
fits
inside
the
Dynatuner
FM-l
in
the
space
provided.
It
requires
slight
modifications in
the
FM-l
because
some
extra
features
are
included
in
the
integrator
which
more
than
outweigh
the
short
time
required for
their
inclusion
..
These
features
are
the
sn~REOCATOR
and
the
dual
volume
control,
which
together
greatly
simplify
stereo
reception.
USING
YOUR. MULTIPLEX
DYNATUNER
Operation
of
the
FMX-3
equipped
DYllahmpr
is
re-
markably
simple.
The
socket
marked
"A"
(indicated
on
the
bottom
plate
beneath
the
output
sockets)
is
the
left
chan-
nel
output.
The
"B"
socket
is
the
right
channel
output.
Shielded
cables
should
connect
these w.ith
the
stereo
pre-
amplifier,
or
directly
to
power
amplifiers
if
no
preamplifier
is
to be used.
Either
the
FM-AM
input..<;
or
the
FM-MPX
inputs
on
the
preamplifier
may
be used.
The
outputs
of
the
Dynatuner
can
go
into
any
input
of 100,000
ohms
imped-
ance
or
greater
which
can
accept
signal levels
between
one
and
two volts.
Stereo
reception is
just
as
simple
as
mono
reception
with
the
multiplex
Dynatuner.
,Just
tune
the
station.
Amono-
phonic
broadcast
will
automatically
be
heard
through
both
speakers. A
stereo
broadcast
will be received with
maximum
separation
(depending
on
the
program
material)
without
adjustment.
Because
the
integrator
performs
the
necessary
switching
automatically,
the
preamplifier
may
usually
be
left in
the
"stereo"
mode.
Under
certain
conditions
of mono
reception,
however,
switching
the
preamplifier
to
the
A+B
(L+R)
mode
may'
afford
reduction
of noise
components
on
weaker
signals.
Refer
to
your
Dynatuner
manual
for
further
information
on
tuner
usage.
When
using
the
FMX-3,
the
lower beam of
the
tuning
eye
is used for
normal
tuning,
and
the
upper
beam
illuminates
the
word
"STEREO"
when a
stereo
station
is
transmitting.
Between
stations,
the
upper
beam
may
light
or
flicker.
There
can
be
no
confusion
as
to
whether
you
are
listening
to a
stereo
station
if
you
tune
for
closure
of
the
lower beam {lrst,
and
then
observe
whether
"STEREO"
is
lighted.
Noise
on
extremely
weak
signals
(there
is
some
19KC
in
random
noise)
and
19KC
harmonics
in
the
pro-
gram
material
may
also
cause
flickering of
the
STEREOCATOR
during
mono reception.
For
those
who use
the
unit
with
amono
system,
in
anticipation
of
the
time
when
they
will
have
the
remainder
of
the
stereo
system,
it
is
suggested
that
they
use a
"Y"
connection
to feed
both
outputs
into
asingle
channel
sys-
tem.
This
will
avoid
limiting
reception
to
one
channel
only
when
a
stereo
broadcast
is received.
It
is
important
to
note
that
a
proper
antenna
is
more
important
for
stereo
reception
than
for
mono
reception.
Many
problems
of noise
and
distortion
can
be
eliminated
by
rotating
the
antenna
for
best
results
on
individual
sta-
tions.
The
ideal
procedure
is to use a
directional
FM
antenna
with a
rotator
and
a
variable
attenuator
in
the
1
feed line.
This
is
not
practical
for everybody, however,
but
orientation
of
the
antenna
for
best
reception is essential
even
when
using
an
indoor
folded dipole
of
the
type
shown
in
the
Dynatuner
FM-l
manual.
If
relocation of
an
indoor
antenna
is frequently required for
best
results,
an
indoor
all-band
TV
antenna
of
the
"rabbit
ears"
type
may
prove
more
convenient
than
the
twin-lead folded dipole.
READ
THESE
INSTRUCTIONS
FIRST
A.
If
this
FMX-3
kit
is
to be
incorporated
into
an
already
completed
FM-l
Dynatuner,
you
may
proceed
with
the
complete
assembly
instructions.
B.
If
this
FMX-3
has
been
purchased
as
a
Semi-Kit,
with
the
etched
circuit
board
factory preassembled,
you
need
not
check
that
section of
the
parts
list
which includes
the
items
on
the
PC-12
board.
You
may
proceed
with
the
assembly
instructions,
ignoring
the
section describ-
ing
the
assembly of
the
etched
circuit
board.
C.
If
you
have
not
yet
assembled
your
FM-l
Dynatuner
kit,
you
can
save afew
minutes
assembly
time
by
noting
the
following
changes
in
your
FM-l
manual:
1( )
page
5,
column
2,
step
1:
Do
not
install
resistors
R20,
R30
or
R35.
2( )
page
6,
column
1,
step
4
at
top
of
page:
Do
not
install
capacitor
C28.
3( ) page 6, column 2,
step
13:
Delete
this
step.
4( ) page 7,
column
2,
step
31:
Delete
the
sentence,
"Solder
all
three
wires".
5( page 10:
Front
Panel
Assembly:
Delete
steps
#1
through
#19
inclusive.
6( )
page
10,
column
2,
step
21: Delete this
step
and
replace it
with
the following instructions:
Twist
together
a
9"
black wire
and
a
9"
green wire.
Thread
these wires
through
the
small
slot
in
the
front
of
the
chassis,
and
through
grommet
#2.
Connect
the
black wire to lug
#2
of
the
three
lug
terminal
strip.
Connect
the
green wire
to
lug
#1
of
the
three
lug
terminal
strip. Also
at
eyelet
#37
on
the
bottom
of PC-8, solder
should
be flowed
onto
the
board
and
over to
the
chassis
to
make
agood
ground
contact
to
the
chassis.
In
the
Preliminary
Assembly
and
Wiring
instructions
for the
FMX-3,
you
can
delete
steps
#1
through
#8
inclusive.
Now
proceed
with
the
assembly
of
your
FM-l
Dynatuner
through
to
the
bottom
of
Page
10 in its
instruction
book.
The
EM-84
tube,
the
volume control,
and
the
plastic
front
plate
insert
supplied
with
the
FM-l
are
not
used
with
the
FMX-3.
Next
assemble
the
FMX-3.
Install
the
12AX7
in
the
FMX-3
but
leave
out
the
6BL8jECF80
while aligning the
FM-l
according to its
instruction
manual.
Then
align
the
FMX-3
as
shown
later
in
this
manual,
after
installing
the
6BL8.
D.
If
you
have
purchased
your
FM-l
Dynatuner
as
a
Semi-Kit,
and
it
is
not
yet
assembled,
you
can
save a
few
minutes
assembly
time
by
noting
the
following
changes
in
your
FM-l
SK
manual
and
supplementary
instructions:
1( page 6, column
2,
step
13:
Delete
this step.
2(
page
7,
column
2,
step
31:
Delete
the
sentence
"Solder
all
three
wires."
3( )
page
10
of
Supplementary
Instruction
sheet
for
the
Semi-Kit:
Front
Panel
Assembly:
Delete
2
steps
#1
through
#11
inclusive.
Add
the following
instructions
after
step
#11:
Twist
together
a9"
black wire
and
a9" green wire.
Thread
these wires
through
the
small
slot
in
the
front of
the
chassis,
and
through
grommet
#2.
Connect
the
black wire
to
lug
.#2
of
the
three
lug
terminal
strip.
Connect
I
the green wire to
lug
#1
of
the
three
lug
terminal
"
strip.
In
the
Preliminary
Assembly
and
Wiring
instructions
for
the
FMX-3,
you
can
delete
steps
#1
through
#6
inclusive.
Now
proceed
with
the
assembly
of
your
FM-l
SK
Dynatuner
through
to
the
bottom
of
the
supple-
mentary
instruction
sheet.
The
EM-84
tube
and
the
plastic
front
plate
insert
supplied
with
the
FM-l
SK
are
not
used
with
the
FMX-3.
Next
assemble
the
FMX-3.
Install
the
12AX7
in
the
FMX-3
but
leave
out
the
6BLBjECF80
while aligning
the
FM-l
according to
its
instruction
manual.
Then
align
the
FMX-3
as
shown
later
in
this
manual,
after
installing
the
6BLB.
ASSEMBLY
INSTRUCTIONS
There
are
five basic
steps
in
the
incorporation
of
your
Dynakit
FMX-3
Multiplex
Integrator
into
the
Dynatuner:
A.
The
installation
of
the
unique
STEREOCATOR
tuning
system
requires
replacement
of
the
present
tuning
eye
and
socket,
and
afew
component
changes
on
the
PC-8
board
in
the
tuner.
B.
The
present
volume control is replaced with a
dual
volume control which
operates
on
both
stereo
channels.
C. Assembly of
the
PC-12
integrator
circuit
board.
D.
Interconnection
of
the
FMX-3
and
the
FM-l
tuner.
E.
Alignment
of
the
FMX-3.
Refer
to
the
FM-l
instruction
manual
for
detailed
I
instructions
on
proper
wiring
and
soldering technique. A
GOOD
SOLDERING
JOB
IS
ESSENTIAL
TO
THE
PERFORMANCE
OF
YOUR
TUNER.
ALL
SOLDER-
ING
MUST
BE
DONE
WITH
ROSIN
CORE
SOLDER.
Whenever
soldering is required,
the
instructions
indicate
it
by
"(
S)
".
If
this
symbol is
not
shown
after
aconnection
i!)
specified,
it
indicates
that
further
connections will be
made
at
that
point
before soldering.
All resistors
in
the
FMX-3
are
1/
2watt.
The
color coding
which specifies
their
value is
indicated
as
they
are
used.
The
first color is
nearest
the
end
of
the
resistor,
and
any
fourth color
band
should
be ignored. All
capacitors
are
marked
with
their
value.
Whenever
a
length
of
hookup
wire is specified,
strip
II!"
from
each
end
unless
otherwise
specified.
BEFORE
STARTING
WORK
ON
THE
DYNA-
TUNER,
MAKE
SURE
THE
LINE
CORD
IS
DIS-
CONNECTED
FROM
ANY
SOCKET.
Preliminary
Assembly
and
Wiring
1(
Remove
the
cover
and
bottom
plate
of
the
tuner.
Save
all
the
hardware.
2( Remove
the
knobs. Remove
the
two
brass
screws
and
the
nut
on
the
volume
control
which secure
the
brass
front plate. Remove
the
front
plate
and
plastic
insert.
3( )
Remove
the
three
sets
of
#4
hardware
which secure •
the
front panel to
the
chassis.
Save
the
hardware.
l _
•
•
4 ( )
Snip
off
at
the
socket,
all
of
the
wires
connected
to
the
tuning
eye
socket
VB.
Snip
off all wires con-
nected
to
the
volume
control.
Set
the
front
panel
aside.
Remove
the
tuning
dial
disc
to
prevent
break-
age.
Remove
V6
and
V7 for
convenience
in
making
future
connections.
5(
Remove
the
tuning
eye
socket
V8
from
the
front
panel.
Save
the
hardware.
6 (
Remove
the
volume
control
from
the
front
panel.
Save
the
%"
lockwasher,
and
the
%"
nut
which
was
removed
in
step
#2.
7(
)
Remove
the
seven
wires
which
are
connected
to
eye-
lets
h25,
#26, #28, #30, #36, #37
and
#38.
Heat
the
eyelets
from
below
and
withdraw
the
wires
from
the
top.
8 ( )
Remove
the
following
four
parts
from
the
PC-8
board,
checking
with
the
pictorial
diagram
for loca-
tion:
R20
(blue-gray-yelJow);
R30
(brown-black
orange);
R35
(blue-gray-orange);
C28
(.0075
disc
capaci
tor).
These
should
bc
removed
by
pulling
gently
on
the
component
with
a
pilir
of
pliers
as
each
lead
is
heated
from
the
other
side
of
the
board
with
a
soldering
iron.
Clear
the
hole
of
solder
by
sweeping
away
the
solder
with
the
tip
of
the
iron,
after
wiping
the
tip
of
the
iron
clean.
Do
this
quickly
with
very
light
pressure
to
avoid
excessively
heating
the
board.
Propping
the
tuner
up
with
books
will
make
the
removal
of
these
components
simpler.
9(
)
Mount
the
tuning
eye
socket
V8M
(with
mounting
flange),
on
the
front
panel
with
two
sets
of
#4
hard-
ware.
Note
that
it
is
now
installed
with
the
blank
space
between
pins
#1
and
#9
at
the
top
of
the
panel.
1O( )
Place
the
%"
lockwasher
on
the
shaft
of
the
dual
volume
control
and
insert
the
control
into
its
hole
in
the
front
panel.
Locate
the
lugs
as
shown
in
the
pictorial
diagram.
Fasten
loosely
with
the
Ye"
nut.
11( )
In
the
location
marked
R20
on
PC-8,
insert
a
100,000
ohm
(brown-black-yellow)
resistor
R20M.
Solder
both
leads
and
snip
oft·
the
excess
close
to
the
bottom
of
the
board.
.
12 ( )
In
the
location
marked
R35,
insert
an
18,000
ohm
(brown-gray-orange)
resistor
R35M.
Solder
both
leads
and
snip
off
the
excess.
13( )
In
the
location
marked
C28,
install
resistor
R39M.
This
resistor
is
22,000
ohms
(red-red-orange)
.
Squeeze
the
leads
together
to
fit
the
present
hole
spacing.
Soldel'
both
leads
and
snip
off
the
excess.
14
( )
Refer
to
Detail
A,
and
make
the
"piggy-back"
combination
of
the
470
mmfd
capacitor
C41M
and
the
22,000
ohm
(red-red-orange)
resistor
R30M.
Solder.
This
combination
is
installed
in
the
location
marked
R30.
Solder
both
leads
and
cut
off
the
excess.
15
( )
Strip
114"
from
the
ends
of
the
black
DETAll"A"
and
green
twisted
pair
of
wires
which
protrude
from
the
small
slot
in
the
front
of
the
chassis.
Connect
the
black
wire
to
pin
#4
of
the
socket
V8M
(S).
Connect
the
green
wire
to
pin
#5
of
socket
V8M
(S).
16(
)
Cut
a
3/1
black
wire.
Strip
one
end
%",
and
feed
it
through
pin
#3
and
connect
it
to
pin
hI
of
socket
V8M.
Solder
both
pins.
Position
this
wire
under
the
right-angled
mounting
bracket
for
V8M
and
close to
the
front
panel.
17
( )
Connect
one
end
of
an
81
12"
red
wire
to
pin
#6
of
socket
V8M
(S).
Feed
the
other
end
through
the
small
slot
in
the
front
of
the
chassis.
18( )
Connect
one
end
of
an
8"
grf>en
wire
to
pin
#7
of
socket
V8M
(S).
Feed
the
other
cnd
through
the
slot
in
the
chassis.
19(
Connect
one
end
of a
3"
red
wire
to
pin
#8 of
socket
V8M
(S).
20(
Connect
one
end
of
a31
12"
green
wire
to
pin
#9
of
socket
V8M
(S).
Position
this
wire
under
the
bracket
and
close
to
the
front
panel.
21
( )
Connect
one
end
of a
3"
red
wire
to
eyelet
h30
on
PC-8
(S).
When
soldering
to
an
eyelet
on
the
board,
tin
the
wire
with
solder
first,
and
then
insert
the
wire
from
above
as
the
eyeld
is
heated
from
below.
Make
certain
that
the
eyelet
is
soldered
to
the
board
as
well
as
to
the
wire
lead.
Do
not
allow
any
bare
wire
to
show
above
the
board,
as
it
could
short
to
the
volwne
control.
22 ( )
Cut
a31
12"
black
wire.
Strip
one
end
3/1"
and
feed
it
through
lug
#l
of
the
volume
control
and
connect
it
to
lug
#4
of
the
control.
23 (
Connect
one
end
of
an
8"
black
wire
to
lug
#1
of
the
volume
control
(S).
24 (
Connect
one
end
of
an
8"
red
wire
to
lug
#2
of
the
volume
control
(S).
25 (
Connect
one
end
of a
6"
red
wire
to
lug
#3
of
the
volume
control
(S)
.
26(
Connect
onc
end
of
an
8"
black
wire
and
one
end
of
a
5"
black
wirc
to
lug
#4
of
the
volume
control
(S).
27 (
Connect
one
end
of
an
8"
green
wire
to
lug
#5
of
the
volume
control
(S).
2R
(
Connect
one
end
of
a
5"
green
wi
re
to
lug
#6
of
the
volume
control
(S).
29 (
Position
the
red
wire
from
eyelet
#30
down
between
the
resistors
near
it
and
towards
socket
V6.
30(
Slide
the
tuning
dial
indicator
disc
fully
onto
the
tuning
capacitor
shaft.
The
hub
goes
on
the
shaft
first,
and
its
flat
side
engages
the
flat
section
of
the
brass
shaft.
31 (
Mount
the
front
panel
to
the
chassis
using
three
sets
of
#4
hardware.
32
(
Connect
the
red
wire
from
pin
#8
of
socket
V8M
to
eyelet
#28
(S).
On
this,
and
all
future
connections
to
eyelets
on
the
board,
make
sure
that
the
eyelets
are
soldered
to
the
board
as
well
as
to
the
wires.
33
(
Connect
the
black
wire from
pin
#3
of
socket
V8M
to
eyelet
#25
(S).
34
(
Connect
the
green
wire
from
pin
#9
of
socket
V8M
to
eyelet
h26
(S).
35(
Connect
the
red
wire
from
eyelet
830
(below
the
volume
control)
to
pin
#2
of
socket
V8M
(S).
Access
to
pin
h2
can
be
gained
through
the
front
panel
cutout.
36(
)
Connect
the
short
black
wire
from
lug
#1
of
the
volume
control
to
eyelet
#37
(S).
3
Assembly
01
the
PC· J2Circuit
Board
Note
that
the
top
of
the
dched
circuit
board
indicates
the
location
of
each
component.
The
identification
symbol
for
each
part
is
marked
between
the
holes
into
which
its
leads
will
be
inserted.
It
is
important
that
all
components
be
mounted
close
to
the
board.
Flow
solder
from
the
lead
onto
the
board
so
that
no ball of
solder
is
evident,
but
rather
a
smooth
transition
from
solder
to
component
lead,
and
to
the
board.
The
solder
must
completely
surround
the
lead.
Do
not
apply
excessive
solder,
but
do
not
hesitate
to
apply
sufficient
heat
to
assure
a
smooth
flow
of
solder
all
around
the
lead
and
onto
the
board.
Be
sure
that
all
the
eyelets
are
soldered
to
the
copper
on
the
board,
as
well
as
to
the
lead.
Cut
off
all
leads
close
to
the
bottom
of
the
board
after
soldering.
1( )
Insert
all of
the
resistors
R71
through
R93
in
their
places
on
the
board.
Solder
all
leads
and
cut
off
the
excess.
2( )
Insert
all
of
the
capacitors
C71
through
C84
in
their
places
on
the
board.
The
direction
in
which
these
capacitors
face
is
not
important.
Solder
all
leads.
3 ( )
Mount
the
two
9-pin
sockets
V71
and
V72.
Note
the
orientation
of
the
flat
side
of
each
socket.
Ground
straps
have
been
installed
in
the
sockets. Be sure
each
pin
penetrates
the
board
and
does
not
bend
over
on
top
of
the board.
Seat
each
socket
firmly
to
the
board
and
then
solder
each
pin,
the
ground
straps,
and
the
center
ground
pin.
4(
Mount
the
choke
L71.
Solder
each
lead
and
cut
off
the
excess.
vide
a
"heat
sink"
when
these
are
soldered
in
place.
When
soldering
them,
grasp
the
loop
with
a
pair
of
pliers
from
the
top
of
the
board,
and
solder
from
the
bottom
of
the
board.
This
technique
prevents
damag-
ing
the
relatively
delicate
diodes
with
excessive
heat
.
final
Assembly
1( )
Install
the
completed
PC-12
board
on
top
of
the
tuner
chassis
in
place
of
the
multiplex
adaptor
cover
plate,
using
the
four
sets
of
#4
hardware.
Follow
the
orientation
in
the
pictorial
diagram.
2 ( )
Twist
together
the
8/1
black
wire
(the
longer
of
the
two
black
wires)
from
lug
#4
of
the
volume
control,
and
the
green
wire
from
lug
# 5 of
the
control.
Con-
nect
the
black
wire
to
eyelet
#82
(S).
Connect
the
green
wire
to
eyelet
#80
(S).
3 ( )
Twist
together
the
following
three
wires:
the
remain-
ing
black
wire
from
lug
#4
of
the
volume
control,
the
red
wire
from
lug
#3
of
the
control,
and
the
green
wire
from
lug
#6
of
the
control.
Connect
the
black
wire
to
eyelet
#77
(8).
Connect
the
red
wire
to eye-
let
1176
(S).
Connect
the
green
wire
to
eyelet
#78
(S).
4 ( )
Twist
together
the
remaining
black
wire
from
lug
#1
of
the
volume
control
and
the
red
wire from
lug
#2
of
the
volume
control.
Connect
the
black
wire
to
eyelet
#84
(S).
Connect
the
red
wire
to
eyelet
#86
(S).
5 ( )
Connect
one
end
of
a 1
%/1
red wire to
eyelet
#36
on
the
bottom
of
PC-8
(8).
Connect
the
other
end
to
eyelet
#38
(S).
•
6(
)
Mount
transformer
'1'73
(432004).
Note
that
this
transformer
can
only
be
mounted
one
way.
Seat
it
firmly, so
that
it
snaps
into
position,
and
make
cer-
tain
that
all
5
connecting
lugs,
as
well
as
the
two
mounting
tabs,
penetrate
the
board.
Solder
all
seven
lugs.
7( )
Mount
PEC-l
and
PEC-2
(555001).
Note
that
these
identical
units
face
in
opposite
directions.
Solder
all
6
leads
and
cut
off
the
excess.
8 ( )
Observing
detail
B,
mount
each
of
the
four
diodes
D71
through
D74.
Those
supplied
may
look like
either
of
those
in
the
illustration,
and
will
have
one
end
painted
red,
or
marked
with
three
stripes.
(Disregard
single
green
dot..,>
or
stripes.)
DI-
~
ODE
POLARITY
IS
IMPOR-
either
TANT.
The
arrowhead
on
PC-12
~
board
points
to
the
marked
end
of
- ' --
,-
the
diode.
Diodes
should
be
soldered
or
carefully
without
excessive
heat,
Pf
using
the
following
technique:
The
-
leads
should
be
bent
up,
and
then
down
in
the
manner
shown
to
pro-
DETAIL"B"
5(
Mount
the
transformers
T7l
and
'1'72
(432003).
Be
careful
to
orient
these
correctly.
Make
certain
that
the
pin
with
the
green dot is inserted
in
the
hole
nearest to
the
heavy
dash
on
the
board.
These
trans-
formers
must
be
seated
firmly
against
the
board,
and
the
two
mounting
tabs
should
snap
into
place.
Solder
all
6
lugs
(4
connecting
lugs
and
2
mounting
tabs)
on
each
transformer.
6 ( )
Observe
the
red
and
the
green
wires
protruding
through
the
slot
in
the
front
of
the
chassis.
Feed
the
red
wire
through
grommet
#2
(in
line
with
the
slot)
and
connect
it
to
eyelet
#79
on
PC-12
(S).
7 ( )
Feed
the
green
wire
through
grommet
#2
and
con-
nect
it
to
eyelet
#75
(S).
This
wire
may
appear
long,
but
the
extra
length
is
used
in
the
alignment
pro-
cedure.
8 ( )
Unsolder
the
two
wires
from
output
socket
A
on
the
back
panel.
Connect
the
free
end
of
the
short
wire
(the
wire
connected
to
output
socket
B)
to
eyelet
#85
(S).
9 ( )
Cut
off
5112"
from
the
green
wire
just
unsoldered
from
output
socket
A
(the
wire
connected
to
eyelet
#39
on
PC-8).
Strip
the
insulation
back
%"
on
the
free
end,
and
connect
it
to
eyelet
#71
(S).
10( )
Connect
one
end
of a
6112/1
black
wire
to
eyelet
#40
of
PC-8
(S).
Be
sure
that
the
solder
flows
from
the
lead,
to
the
eyelet,
and
onto
the
copper
on
the
board.
Connect
the
other
end
of
this
wire
to
eyelet
#73
(S).
11
(
Connect
one
end
of a
6"
green
wire to
eyelet
#33 of
PC-8
(S).
Connect
the
other
end
to
eyelet
#72
(S).
12 (
Connect
one
end
of
a
2/1
green
wire
to
the
long
(center)
lug of
output
socket
A
(8).
Connect
the
other
end
to
eyelet
#81
(S).
The
remaining
steps
will
require
connections
to
lugs
pre-
viously
soldered
in
the
construction
of
the
FM-l
(unless
t
you
are
building
the
FM-l
and
FMX-3
at
the
same
time,
in
which
case
solder
will
not
have
been
applied).
It
may
4
•
be
necessary
to
clear
away
some
of
the
solder
previously
applied.
To
make
these
connections,
heat
the
lug
and
push
the
wire
through
the
terminilL
Bc
certain
that
when
solder-
ing
is
called
for,
all
of
the
wires
are
finnly
soldered
to
the
terminal.
13( )
Connect
one
end
each
of
two
6/1
green
wires
to
lug
#1
of
the
three
lug
terminal
strip.
For
convenience
of
wire
location,
insert
one
wire
from
each
side
of
the
lug.
See
the
pictorial
diagram.
Solder
all
wires.
A
total
of 8
wires
are
connected
to
this
lug.
14 ( )
Connect
onc
end
each
of
two
6"
black
wires
to
lug
#2
of
the
three
lug
terminal
strip.
For
convenience
of
wire
location,
insert.
one
wire
from
each
side
of
the
lug.
Solder
all
wires. A
total
of 6
wires
are
con-
nected
to
this
lug.
1.'5
( )
Twist
together
the
black
and
the
green
wire
from
the
front
side
of
the
lug
terminal
strip.
Connect
the
black
wire
to
the
center
ground
pin
of socket. V71
(S).
Connect
the
green
wire
to
eyelet
#74
(S).
Posi-
tion
the
wires
as
shown
in
the
pictorial.
16
( )
Twist
together
the
remaining
black
and
green
wires
from
the
lug
terminal
strip.
Connect
the
black
wire
to
the
center
gwund
pin
of
socket
vn
(S).
Connect
the
green
wire
to
eyelet
#83
(S).
Position
the
wires
as
shown
in
the
pictorial.
17
( )
Connect
one
end
of
a
9"
red
wire
to
lug
#4
of
the
quadruple
section
filter
capacitor.
Solder
all
wires.
A
total
of 3
wires
and
one
resistor
lead
are
connected
to
this
lug.
Connect
the
other
end
to
eyelet
#87
(S).
The
wiring
of
your
Multiplex
Integrator
is
now
com-
pleted.
It
is
wise
at
this
point
to go
back
and
check
all
solder
connections
in
the
unit.
One
poor
solder
connection
can
upset
the
performance
of
your
unit.
Check
to·
be
sure
that
the
position
of
the
wires
in
your
unit
agrees
closely
with
the
pictorial
diagram
and
the
photographs.
The
pic-
torial
diagram
must
necessarily
be
exaggerated
for
clarity,
but
any
discrepancies
between
it
and
the
photographs
are
of
no
consequence.
Make
sure
you
remove
all
loose
pieces
of
solder
or
wire.
Position
the
red-black
and
green-black
pairs
of
leads
from
the
volume
control
to
eyelets
#80, #82,
1184
and
#86
exactly
as
shown
in
the
pictorial
diagram,
around
the
V-71
socket
and
away
from
T73.
Keep
them
clear
of
the
board.
Insert
the
tubes
in
their
respective
sockets
on
the
PC-8
and
PC~12
boards,
and
install
the
tube
shields.
Make
sure
the
ground
straps
on
the
sockets
slip
between
the
shield
and
the
tube.
Insert
the
EMM-801
tube
in
the
V8M
socket.
Now
tum
the
tuner
on
and
allow
it
to
operate
for
one
half
hour
or
more
to
allow
the
tubes
to
age
and
for
operat-
ing
conditions
to
stabilize.
Assuming
that
your
FM-l
has
been
aligned
according
to
its
instructions,
you
should
be
able
to
enjoy
the
use
of
your
tuner
at
this
time,
and
nonnal
monophonic
reception
should
be
available
at
both
output
jacks,
using
the
lower
beam
of
the
dual-beam
tuning
eye
for
tuning
in
the
stations.
The
upper
beam
will
be
used
as
a
stereo
indicator.
A
stereo
program
may
have
insufficient
separation
pending
complete
alignment,
but
in
other
respects
should
be
satisfactorily
received.
If
the
above
conditions
are
not
apparent,
refer
to
the
sedion
"In
Case
of
Difficulty"
before
proceeding
with
alignment
of
the
FMX-3.
ALIGNMENT
The
Dynatuner
should
have
been
aligned
according
to
the
instructions
in
the
manual
for
the
FM-1
before
you
pro-
ceed
with
the
alignment
of
the
FMX-3.
Correct
alignment
of
the
tuner
is
especially
important
for
proper
stereo
opera-
tion,
and
in
particular,
the
discriminator
mllst
be
accurately
aligned
according
La
the
instructions
in
the
PM-I
manual
if
maximum
noise
rejection
is to
be
realized.
It
is
necessary
to
remove
the
6BL8
tube
from
the
completed
FMX-3,
although
the
12AX7
(V72)
must
be
in
place
when
alignment
of
the
tuner
only
is
carried
out.
The
lower
beam
of
the
new
dual
beam
tuning
eye
is
used
in
the
same
way
as
the
EM84
in
the
alignment
procedures
described
in
the
FM-l
Dynatuner
manual.
The
alignment
procedure
for
your
multiplex
integrator
is
as
simple
and
precise
as
the
alignment
procedure
for
your
Dynatuner.
It
involves
only
the
peaking
of
the
tuned
circuits
for
the
proper
reinsertion
of
the
stereo
sub-carrier.
The
transformers
of
the
FMX-3
integrator
have
been
presd
close
to
the
proper
alignment
point.
The
accuracy
with
which
the
alignment
procedure
is
performed
will
determine
the
stereo
separation
capability
of
the
tuner,
hut
due
to
variations
in
the
broadcast
material,
the
same
degree
of
separation
will
not
always
be
apparent.
The
only
tool
required
for
alignment
is
the
plastic
tool
supplied
with
your
Dynatuner.
Only
this
type
of tool
should
be
used
for
adjusting
the
transformers.
When
using
this
tool,
all
adjustments
should
be
made
using
the
end
which
has
a
shoulder
to
prevent
inserting
the
tool too far.
BE
CAREFUL
IN
HANDLING
THE
CHASSIS
DURING
ALIGNMENT.
THERE
IS
SOME
SHOCK
HAZARD
DUE
TO
THE
EXPOSED
WIRING.
If
you
are
careful,
it
is
possible
to
unsolder
and
resolder
the
required
wires
in
the
following
steps
without
turning
off
the
tuner.
However,
if
you
wish
to
avoid
all
risk of
shock,
you
can
turn
the
tuner
off,
make
the
connections,
and
t.um
it
on
again.
It
is
essential
that
you
give
the
set
afew
minutes
to
warm
up
thoroughly
after
any
time
that
you
tum
it
off.,
even
if
the
off
time
is
only
a
minute
or
less.
It
is
suggested
that
you
read
these
instructions
over
completely
before
proceeding
to
completely
familiarize
yourself
with
the
alignment
procedure.
If
the
6BL8
has
been
removed,
it
and
its
shield
must
be
reinstalled.
The
tuner
is
to
be
connected
to
an
antenna,
turned
on,
and
precisely
tuned
to
a
known
stereo
broadcast.
The
connec-
tion
of
an
amplifier
and
speaker
is
not
required.
The
lower
beam
of
the
EMM-801
eye
indicates
proper
tuning
of
either
mono
or
stereo.
It
is
designed
so
that
it
does
not
overlap,
but
maximum
closure
indicates
the
point
of
correct
tuning.
The
upper
beam
of
the
eye
is
the
S'TEREOCATOll.
It
will
close
completely
(after
alignment)
in
the
presence
of
the
H:lKC
pilot
signal
which
is
an
integral
part
of a
stereo
broadcast.
It
will
be
fully
open
when
a
monophonic
broad-
cast
is
correctly
tuned,
and,
depending
on
ambient
noise
conditions,
it
may
flicker
between
stations.
1 ( )
Temporarily
solder
one
end
of
the
1.2
megohm
(brown-red-green)
resistor
R94
to
the
center
ground
pin
of V71
(S).
Temporarily
solder
the
other
end
to
eyelet
#75
(S).
This
is
one
test
point,
TP.
Using
the
shoulder
end
of
the
plastic
alignment
tool,
adjust
transfonners
T71
and
T72
for
maximum
closure
of
the
upper
beam
of
the
eye.
Adjust
first
one
trans-
former,
and
then
the
other,
and
repeat.
The
purpose
of
the
resistor
is
to
reduce
the
closure
of
the
eye
for
easiest
adjustment.
Usually
only
a
very
small
adjust-
ment
is
necessary
to
reach
the
right
point.
2(
)
Remove
the
1.2
megohm
resistor
from
eyelet
#75,
and
temporarily
solder
it
to
eyelet
#88
(S).
This
is
the
other
test
point,
TP.
5
5
3 ( )
Unsolder
the
green
wil'e
connected
to
eyelet
#75
and
temporarily
solder
it
to
eyelet
#88
(S).
4(
Adjust
the
top
slug
of
1'73
for
maximum
closure
of
the
upper
beam
of
the
eye.
5( )
Adjust
the
bottom
slug
of
1'73
for
maximum
closure
of
the
upper
beam
of
the
eye.
6(
Repeat
step
#4.
7 (
Repeat
step
#5.
8 (
Remove
the
1.2
megohm
resistor.
This
can
be
saved
for
future
use
when
realignment
is
desired.
9 (
Unsolder
the
green
wire from
eyelet
#88
and
resolder
it
to
eyelet
#75
(S).
This
completes
alignment
of
your
Dynatuner
Multiplex
Integrator.
If
the
brass
front
plate
is
being
installed
for
the
first time,
its
protective
plastic
film
must
be
peeled
off
and
it
is wise to
cut
threads
in
the
holes
above
and
below
the
tuning
capacitor
shaft
with
the
two
small
brass
plated
self
tapping
screws
by
inserting
and
removing
them.
This
will
avoid
scratching
the
brass
by
enabling
much
easier
insertion
when
the
front
plate
is
installed.
Remove
the
%))
nut
holding
the
volume
control
to
the
front
panel.
Insert
the
rectangular
plastic
insert
which
is
included
in
the
FMX-3
kit,
into
the
front
plate
cutout
from
the
rear
(the
top
edge
is
narrower
than
the
bottom).
Place
the
front
plate
against
the
steel
front
panel
so
that
the
plastic
insert
is
held
between
the
two
plates,
and
the
volume
con-
h'ol
shaft
and
the
tuning
capacitor
shaft
protrude
through
both
panels.
Install
the
%"
nut
on
the
volume
control
shaft
and
tighten
it.
Secure
the
front
plate
to
the
panel
with
the
two
brass
self-tapping
screws
above
and
below
the
tuning
shaft.
Rotate
the
volume
control
shaft
fully
counter-
clockwise
and
install
the
small
knob
with
the
pointer
at
the
7o'clock position.
The
knob
is
pushed
onto
the
knurled
shaft.
Fasten
the
large
knob
onto
the
tuning
capacitor
shaft
by
tightening
the
set
screw.
Install
the
rubber
feet
in
the
corner
holes
of
the
bottom
plate,
and
secure
the
bottom
plate
and
the
cover
with
the
four
sheet
metal
screws.
The
flange
on
the
front
of
the
cover
goes
between
the
steel
front
panel
and
the
brass
front
plate.
Your
Multiplex
Dynatuner
is
now
ready
for long
pleas-
ureable
use.
IN
CASE
OF
DIFFICULTY
Your
FM-l
Dynatuner
manual
has
some
trouble
shooting
suggestions
(page
13) which
are
applicable
to
the
complete
stereo
tuner.
In
addition,
it
is
frequently
possible to
locate
difficulties by
using
the
voltage
table
in
this
manual.
A
vacuum
tube
voltmeter
is required.
Departures
of
more
than
20%
from
the
indicated
values
(except
for
voltages
marked
,:,)
indicate
apossible
error
or
component
failure.
Some
understanding
of
the
FMX-3
circuitry
will
assist
in
troubleshooting.
Review
the
circuit
description
at
the
beginning of this
manual.
In
addition,
the
STEREOCATOR
(upper
beam
of
the
EMM-801)
will
aid
in
locating
the
difficulty.
The
STEREOCA1'OR
is
operated
by
the
19KC
amplifier
and
doubler
circuit
(1'71,
Tn,
V71).
Remember
thai
in
most
cases, if
the
EMM-801
socket
has
been
correctly
wired,
improper
indication
by
the
STEREOCATOR
is
an
effect,
rather
than
acause.
If
the
STEREOCATOR
remains
closed
on
both
mono
and
sicrc>o
stations,
the
19KC
amplifier
is oscillating. Arough
check of
the
STEREOCATOR
is to
disconnect
the
green
wire from
eyelet
#75
and
touch
the
free
end
with
the
finger,
which
should
illuminate
the
word
STEREO.
6
If
the
STEREOCATOR
passes
this
test,
but
does
not
deflect
on
aknown
stereo
broadcast,
check
the
6BL8,
and
also
check
the
continuity
of 1'71
and
Tn
with
an
ohmmeter.
The
resistance
of
each
transformer
pin
to
ground
is
approx-
imately
as
follows:
#1
pin-On,
#2
pin-40n,
113
pin-IOn.
#4
pin-100ft
The
#1
pin
is
identified
on
the
board
by
a
white
mark
(green
dot
on
the
can)
and
the
pins
are
num-
bered
clockwise when looking
at
the
bo/.tom
of
the
board.
If
the
STEREOCATOR
is
operating
correctly,
but
there
is
little
or
no
separation
on aknown
stereo
broadcast,
make
certain
that
the
fault
does
not
lie
in
the
broadcast.
Program
material
or
transmission
deficiencies
are
common
causes
of
such
complaints
where
stereo
programming
is relatively
new.
Separation
may
also
be
adversely
affected
by
"multi-
path
distortion"--reflections
of
the
signal
by
buildings,
hilly
terrain,
etc.,
which
cause
effects
similar
to television
"ghosts,"
often
accompanied
by
distortion
of
the
audio
sig-
nal.
Multipath
effects
can
be
reduced
only
by
improving
the
antenna
system-relocation,
reorientation,
or
replacement
with
a
more
directional
antenna.
If
it
has
been
determined
that
poor
separation
is
caused
by
the
FMX-3,
and
the
STEREOCATOR
operates
nor-
mally,
the
T73
transformer
may
be
incorrectly
aligned,
although
1'71
and
1'72
should
also be checked.
Incorrect
alignment
can
also
cause
channel
reversal.
Normally,
the
A
output
jack
is
the
left
channel.
A
diode
which
is
faulty,
or
one
which
is
installed
incor-
rectly
may
also
reduce
the
separation,
but
this
will
usually
be
accompanjed
by
a
significant
reduction
in
output
on
the
affected
channel.
If
the
6BL8
tube
is removed,
there
will be
no
separation,
and
the
STEREOCATOR
will
not
light,
but
monophonic
transmissions
will still be
normally
received
with
equal
out-
put
from
the
A
and
B
output
jacks.
If
these
signals
are
un-
balanced,
or
if
one
channel
is
distorted,
the
difficulty is
in
the
diode
bridge
or
in
the
V72
circuit.
If
the
stereo
alignment
procedure
can
be
carried
out
with
eye
deflection
at
both
alignment
points,
it
is
probable
that
the
19KC
and
doubler
sections
are
functioning
properly.
If
there
is
no
audio
signal
when
there
is deflection
of
the
upper
beam
of
the
EMM-80l
when
tuned
to a
stereo
broadcast,
then
the
signal
path
should
be
checked
from
eyelets
#33
and
#39
through
choke
L71, to 1'73,
through
the
diode
bridge
to
the
dual
volume
control
and
to
pins
#2
and
#7
of
vn.
Touch-
ing
the
circuit
at
any
of these
points
should
produce
a
pop
or
hum
through
the
system.
If
not,
something
in
this
path
is
malfunctioning.
FACTORY SERVICE
AND
GUARANTEE
It
is
recommended
that
the
entire
Dynatuner
with
FMX-3
installed
be
returned
to
the
factory
for
service
should
service
be
required.
Rpmoval
of
the
FMX-3
for serv-
icing is
generally
not
practical
since
its
performance
is
interrelated
with
that
of
the
Dynatuner,
and
both
should
be
examined
as
an
entity.
Please
refer
to
the
FM-l
manual
for
factory
warranty
and
service
on
the
FM-l.
This
section
is
applicable
to
the
FMX-3
without
additional
charge
for service of
the
multi-
plex
portions
of
the
circuitry.
Dyna
Company
assumes
no
responsibility
or
liability
for
damages
or
injuries
sustained
in
assembly
or
operation
of
the
FM-l
and/or
FMX-3.
I
I
VOLTAGE CHECK POINTS
All voltages
are
measured
between
the
point
indicated
and
the
chassis, using a
vacuum
tube
voltmeter. All voltages
are
measured
with
volume control
at
maximum.
STEREO
voltages
are
measured
when
tuned
to
a
station
known
to
be
transmitting
astereo signal.
QUIESCENT
voltages
are
measured
with V6 removed from
its
socket
to
obtain
quiescent
condition
of
the
FMX-3
and
the
tuning
eye. Voltages
indicated
by
("')
vary
with
signal
strength
but
should
always
be
negative.
PIN #
TUBE
CONDITION 1 2 3 45 6 7 8 9
QUIESCENT 0205 0 0 6.3
AC
29
-.64
53
-.6
V
8M
EMM801
STEREO
0200 0 0 6.3AC 180
-14*
150
-7'~
QUIESCENT 29 078 6.3
AC
072 11.5
-.15
V71
6BLBjECF80
STEREO
45 0
71
6.3AC 064 1.1 1.1
-14*
QUIESCENT 135 0.85 00135 0.85 6.3AC
V72
12AX7jECC83
STEREO
135 0.85 0
()
135 0.85 6.3AC
PARTS
LIST
....
The
parts
listed
here
are
in
addition
to
the
parts
list
included
with
the
pictorial
diagram
of PC-12. Acomplete
inventory
will
include
both
sections.
Parts
of
similar
type
which
do
not
change
performance
may
sometimes
be
included
as
a
matter
of
expediency
..
This
will
account
for
slight
variations
in
value
and
appearance.
1
Etched
circuit
board
PC-12
1
Dual
volume control, 250,000
ohms
per
section
1
Plastic
insert
for
front
plate
1
Audio
cable
shielded
3
Pieces
hook-up wire
(red-black-green)
1 9
pin
tube
socket
with
flange -
V8M
1
EMM801
tube
-
V8M
1
Instruction
manual
1
Warranty
card
CAPACITOR
C
41M
470 mmfd
RESISTORS
R
20M
100,000
ohms
brown-black-yellow
R
30M
22,000
ohms
red-red-orange
R
35M
18,000
ohms
brown-gray-orange
R
39M
22,000
ohms
red-red-orange
R94 1.2 megohms brown-red-green
•0
S8
t8
12AX7
Ia
18
ClI
Z8
I
-zu-
-lBI--
tll~
-98H-
-S8H-
08
m
I
98
-99H-
-16H-
I
-68H-
,
-06H-
£L
I
G
-£6H-
6L
Ib
-6L~-
tLO
I
zl~
·t83·
~!88
*t
L8
IC
-ClIH-
I
au
I
-t8lI-
£w
ILH
II
8L~
-ZlH-
I
II I
-£tH-
. I
6f
,
-18H-
ZL
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£L~
-tLH-
-m-
,I
o~
I
-SLH-
G
fiLa
9L
~\
I
IL
W.
UO
*...
:;;
\IIj!
DLI
III
.L~
-9LH-
II
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'"'"
I
Lf~
-9L~-
d1
SL
L\
BL
lfl
6BL8/EC~
-LiH-
00
(0
0
7
-e-
100,000
ohms
22,000
o~ms
18,000
ohms
22,000
ohms
18,000
ohms
240
ohms
22,000
ohms
47,000
ohms
150,000
ohms
1.2
megohms
3.3
megohms
2,200
ohms
220,000
ohms
150,000
ohms
47,000
ohms
47,000
ohms
47,000
ohms
47,000
ohms
100,000
ohms
100,000
ohms
1,000
ohms
1,000
ohms
100,000
ohms
100,000
ohms
470,000
ohms
470,000
ohms
470,000
ohms
1.2
megohms
470
mmfd
500
mmfd
220
mmfd
.012
mId
.0068
mfd
SOO
mmfd
.001
mfd
.0033
mfd
.0015
mId
.01
mfd
500
mmld
100
mmfd
.1
mfd
.1
mId
18
mmld
IN
54!
IN541
IN541
IN541
53
mh
choke
transformer
=432003
transformer =
432003
transformer
=432004
£MM801
6BL8j£CF80
12AX7
JECC83
module
=555001
module
=555001
PARTS
LIST
FOR
SCHEMATIC DIAGRAM
V71B
R94
R92
TP
Rn
SCHEMATIC DIAGRAM
RS8
,
-=-
V72B
074
R84
D72
R82
PEC-2
":;"
ll'\'"
'-.../
\ll'~
\(\~
\~
\-
I
250K
~
j
-
OUALCONT.
-
R73
R74
R75
C74
R72
~OP
IT
I~
!
~
2I • I 2
R80
-=-
R81
R83
(88)TP
'r
C84
V71A
C79
J
RS9
-=-
l71
5
C80
r
4
~
I
I
I
I
I
I
I
I
R20MI
I
I
I
I
V7B
1
6.3
VAC
-=-
R39M
V7A
I • (33) . (
r---.~
I
(79~
---I'
-~,-;::;::--~.L----~
I
II
(7~)
I
TP
00
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