Heathkit Heathkit SG-8 Installation instructions
ASSEMBLY
AND
OPERATION
OF
THE
HEATHKIT
SIGNAL
GENERATOR
MODEL
SG-8
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SPECIFICATIONS
Frequency
Range
Band
A.
Band
B.
Band
C.
Band
D.1
Band
E.
Calibrated
Harmonics..
Radio
Frequency
Output
Modulation
Frequency.
.
Audio
Output.
Audio
Frequency
Input.
.
Tubes
12AU7.RF
Oscillator-Buffer
6C4.Audio
Oscillator
or
Audio
Amplifier
Power
Requirements.105-125
v,
50/60
cycles
Cabinet
Size.5
1/2
wic
e
x
6
1/2
high
x
5
deep
Shipping
Weight.7
lbs.
160
kc
to
500
kc
500
kc
to
1650
kc
1.65
me
to
6.5
me
6.5
me
to
25
me
25
me
to
110
me
1:
0
me
to
220
me
In
excess
of
100,000
microvolts
Approximately
400
cycles
2
to
3
vo
ts
Approximately
5
v
across
1
megohm
MODEL
SG-8
TT
W
RF
“
0UT
INTRODUCTION
The-Heathkit
model
SG-8
Signal
Generator
has
been
designed
for
simplicity
of
construction
and
stability
of
operation.
A
little
care
taken
during
the
process
of
construction
will
reward
the
kit
builder
with
a
signal
generator
which
will
give
excellent
performance
and
will
be
both
pleasant
and
easy
to
use.
This
generator
has
been
engineered
so
that
it
will
be
valuable
to
the
radio
re¬
pairman,
ham
and
experimenter
over
a
wide
range
of
uses,
in
addition
to
being
a
rugged
and
highly
dependable
piece
of
test
equipment.
It
is
made
with
high
quality
parts,
conservatively
rated,
and
will
give
long
and
efficient
service.
The
model
SG-8
Signal
Generator
utilizes
factory
adjusted
coils,
thereby
eliminating
the
necessity
of
having
costly
equipment
available
to
cali¬
brate
the
finished
kit.
CIRCUIT
DESCRIPTION
The
RF
portion
of
the
SG-8
Signal
Generator
consists
of
a
12AU7
twin
triode
tube.
One
triode
section
of
this
tube
is
used
as
a
Colpitts
oscillator.
The
other
triode
section
is
used
in
a
cathode
follower
type
circuit
and
acts
as
a
buffer
between
the
oscillator
and
the
output
of
the
signal
gen¬
erator.
Four
inductances
wound
on
forms
comprise
the
coils
for
bands
A,
B,
C
and
D.
They
are
switched
into
the
circuit
by
means
of
the
band
switch.
TheE
band
coil
is
unique
in
its
construc¬
tion
insofar
that
the
heavy
buswire
of
which
it
is
composed
actually
forms
the
connections
be¬
tween
the
band
switch
and
the
tuning
condenser
for
all
of
the
lower
frequency
coils.
When
the
band
switch
is
placed
in
E
band
position,
a
short
is
placed
across
the
leads
of
the
E
band
coils,
thereby
making
it
a
closed
circuit
inductance
which
is
capable
of
tuning
from
25
to
100
mega¬
cycles.
In
a
Colpitts
oscillator
circuit,
feedback
necessary
to
maintain
oscillations
is
obtained
from
a
capacitive
reactance
divider
across
the
inductance
of
the
frequency
determining
circuit.
In
the
model
SG-8,
a
capacitive
divider
is
obtained
by
the
use
of
a
split-stator
condenser.
The
ad¬
vantage
of
this
will
be
made
apparent
from
the
following
explanation.
For
example,
take
a
ca¬
pacitive
divider
composed
of
fixed
capacities.
As
the
frequency
across
the
condensers
is
in¬
creased,
the
reactance
of
the
condensers
is
decreased.
Therefore,
using
a
fixed
capacitive
divider,
as
the
frequency
is
increased
reactance
would
become
lower
until
a
point
was
reached
where
oscillations
could
no
longer
be
maintained.
By
the
use,of
a
split-stator
condenser
for
both
tuning
and
as
the
divider
network
as
the
frequency
is
increased,
the
capacity
of
the
con¬
denser
dividing
network
is
decreased.
The
reactance
of
a
condenser
for
any
given
frequency
is
inversely
proportional
to
the
capacity.
This
tends
to
maintain
the
reactance
of
the
network
fair¬
ly
constant,
thereby
permitting
oscillation
over
a
wide
range
of
frequency.
The
use
of
the
cathode
follower
as
a
buffer
stage
has
the
following
advantage:
The
characteris¬
tics
of
a
"cathode
follower"
are
very
low
output
impedance
with
an
extremely
high
input
imped¬
ance.
The
extremely
high
input
impedance
produces
little
or
no
loading
on
the
oscillator
circuit.
The
very
low
output
impedance
provides
a
very
stable
output
from
the
signal
generator.
The
effect
is
such
that
a
varying
load
on
the
output
of
the
signal
generator
will
produce
little
or
no
frequency
instability
of
the
oscillator.
The
signal
generator
incorporates
a
step
attenuator
for
coarse
control
of
radio
frequency
output
aftd
a
continuously
variable
attenuation
circuit
for
fine
control
of
the
radio
frequency
output.
The
audio
oscillator
is
also
a
Colpitts
circuit.
By
the
use
of
the
large
inductance
of
an
iron-
core
choke
and
relatively
high
capacity
in
the
capacitive
divider,
it
is
made
to
oscillate
al
ap¬
proximately
400
cycles.
This
type
of
oscillator
was
again
chosen
for
its
stability
and
purity
of
waveform.
With
the
modulation
switch
in
the
INT.
position,
400
cycles
audio
voltage
is
ap¬
plied
through
a
resistance
network
to
the
grid
of
the
cathode
follower
stage.
This
audio
vo’tage
is
impressed
as
an
amplitude
modulated
signal
upon
the
RF
output
from
the
cathode
folio
ver
.
At
the
same
time
the
audio
voltage
is
also
applied
to
the
external
audio
cc
nnt
tor
marked
OUT,
and
may
be
used
as
an
audio
signal
source
for
testing
amplifiers,
etc.
Wuh
the
modul
ition
switch
in
the
EXT.
position,
any
external
audio
source
of
any
frequency
may
be
used
to
modu¬
late
the
RF
output
of
the
signal
generator.
The
6C4
audio
oscillator
tube
then
becomes
an
am¬
plifier
stage
for
the
external
signal.
Page
3
I
The
power
apply
consists
of
a
transformer
which
furnishes
filament
voltage
to
the
6C4
and
12AU7
tubet
and
effectively
isolates
the
instrument
from
the
AC
line.
A
selenium
rectifier
is
connected
t<
one
winding
of
the
transformer
producing
half-wave
rectification.
An
RC
filter
network
cha
iges
the
pulsed
output
from
the
rectifier
to
fairly
pure
DC.
The
110
volt
input
has
both
sides
bypassed
to
minimize
the
signal
feeding
back
through
the
power
lines.
A
unique
de
ugn
feature
is
the
convenient
AF
IN-OUT
control,
which
adjusts
audio
input
if
ex¬
ternal
moduation
is
employed
and
likewise
adjusts
theAF
output
level
when
using
the
generator
as
a
source
of
audio
output.
9
PRELIMINARY
INSTRUCTIONS
AND
NOTES
TheHeathki
model
dG-8
Signal
Generator
when
constructed
in
accordance
with
the
instructions
in
this
mam
al,
is
a
high-quality
piece
of
test
equipment,
capable
of
years
of
trouble-free
serv¬
ice.
We
therefore
urge
you
to
take
the
necessary
time
to
assemble
and
wire
the
kit
carefully.
You
will
be
rewarded
with
a
neat
appearing,
well-built
and
dependable
test
oscillator.
This
manual
is
supplied
to
assist
you
in
every
way
to
complete
the
signal
generator
with
the
least
possit
le
<
hance
for
error.
We
suggest
that
you
take
a
few
minutes
now
and
read
the
en¬
tire
manual
thr
)ugh
before
any
work
is
begun.
This
will
enable
you
to
proceed
with
the
work
much
faster
wl
en
c
instruction
is
started.
The
large,
fold-in
pictorials
are
handy
to
attach
to
the
wall
above
your
work
space.
Their
use
will
greatly
simplify
the
construction
of
the
kit.
These
diagrams
are
repeated
in
smaller
form
within
the
manual.
We
suggest
that
you
retain
the
mamal
in
your
files
for
future
reference,
both
in
the
use
of
the
signal
generator
and
for
its
mainten
mce.
UNPACK
THE
KIT
CAREFULLY
AND
CHECK
EACH
PART
AGAINST
THE
PARTS
LIST.
In
so
doing,
ycu
will
become
acquainted
with
each
part.
Refer
to
the
charts
and
other
information
shown
on
tho
inside
covers
of
the
manual
to
help
you
identify
any
parts
about
which
there
maybe
a
question.
If
some
shortage
is
found
in
checking
the
parts,
please
notify
us
promptly
and
return
the
inspection
slip
with
your
letter
to
us.
Hardware
items
are
counted
by
weight,
and
if
a
few
are
missing,
please
obtain
them
locally
if
at
all
possible.
Read
tho
note
on
soldering
on
the
inside
of
the
back
cover.
Crimp
all
leads
tightly
to
the
termi¬
nal
before
soldering.
Be
sure
both
the
lead
and
the
terminal
are
free
of
wax,
corrosion,
or
other
foreign
substances.
Use
only
the
best
rosin
core
solder,
preferably
a
type
containing
the
new
activated
fluxes,
such
as
Kester
"Resin-Five,
"
Ersin
"Multicore,"
or
similar
types.
NOTE:
GUARANTEES
ARE
VOIDED
AND
V/E
WILL
NOT
REPAIR
1ENTS
USED.
DRE
SOLDER
OR
PASTE
FLUXES
HAVE
BEEN
SOLDER,
IT
IS
RECOMMENDED
THAT
A
NEW
IN
DOUBT
ABOUT
SOLDER,
IT
IS
REC
'
MARKED
"ROSIN
CORE
RADIO
SOLDER
Resistors
and
condensers
generally
have
a
tolerance
rating
of
±20%
unless
otherwise
stated
in
the
parts
list.
Therefore
a
100
KO
resistor
may
test
anywhere
from80Kft
tol20Kfi.
(Thelet¬
ter
K
is
commonly
used
to
designate
a
multiplier
of
1100.)
Tolerances
on
condensers
are
gen¬
erally
even
greater.
Limits
of
+100%
and
-50%
are
common
for
electrolytic
condensers.
The
parts
furnished
with
your
Heathkit
have
been
specified
so
they
may
not
adversely
affect
the
op¬
eration
of
the
finished
signal
generator.
In
order
to
expedite
delivery
to
you,
we
are
occasionally
forced
to
make
minor
substitutions
of
parts.
Such
substitutions
are
carefully
checked
before
they
are
approved,
and
the
parts
sup¬
plied
will
work
satisfactorily.
By
checking
the
parts
list
for
resistors,
for
example,
you
may
find
that
a
2.2
megohm
resistor
has
been
supplied
in
place
of
a
2
megohm
as
shown
in
the
parts
list.
These
changes
are
self-evident
and
are
mention'd
here
only
to
prevent
confusion
in
check¬
ing
the
contents
of
your
kit.
We
strongly
urge
that
you
follow
the
wiring
and
parts
layout
shown
in
the
manual.
The
position
’age
4
TEST
LEAD
ASSEMBLY
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i
■
HWHHi
Figure
11
The
test
lead
is
assembled
as
shown
in
Figure
11.
One
end
of
the
shieldedcable
is
connected
to
the
shielded
plug;
the
other
end
has
alligator
clips
mounted
on
it
for
connection
to
the
equipment
under
test.
First,
remove
the
spring
cable
guard
from
the
connector
plug
by
loosening
the
screw
in
the
side
of
the
plug.
Slide
this
spring
over
the
shielded
cable,
with
the
small
end
of
the
spring
toward
the
end
that
is
to
be
connected
to
the
plug.
The
outside
insulation
on
the
cable
is
then
cut
back
for
a
length
of
about
3/4",
then
flare
the
shield
braiding
at
the
end
of
the
cable
so
that
it
may
be
pushed
back
over
the
small
end
of
the
spring
cable
guard.
The
inner
connector
is
then
stripped
for
a
length
of
approximately
1/8".
The
assembly
at
this
point
is
slid
back
into
the
connector
so
that
the
inner
coaxial
wire
passes
through
the
rivet
in
the
insulated
end
of
the
connector,
the
cable
guard
with
the
shielded
braid
flared
over
the
end
is
pushed
back
into
the
connector
and
the
screw
tightened
to
hold
it
in
place.
Solder
the
inner
connector.
Slit
lengthwise
Circular
cut
METHOD
OF
PREPARING
SHIELDED
LEAD
Shielded
test
lead
ready
lor
connector.
Figure
12
On
the
other
end
of
the
shield
cable,
the
outer
insulation
is
cut
back
about
4"
and
the
cable
pre¬
pared
as
shown
in
Figure
12.
Solder
alligator
clips
to
both
the
inner
conductor
and
the
shield
braid.
ACCURACY
Any
signal
generator
is
designed
as
a
convenient
and
controllable
source
of
modulated
or
unmod¬
ulated
signals.
No
signal
generator
is
designed
as
a
frequency
standard
Expensi
/e
standard
signal
generators
have
fairly
accurate
(3
to
20%)
attenuators
which
control
the
output
voltage
and
the
calibration
accu
acy
is
rarely
closer
than
1%.
The
Heathkit
Signal
Generator
may
be
expected
to
fall
within
2
to
3%
of
the
frequency
calibration,
which
is
quilt
satisfactory
for
ser¬
vice
work
and
alignment.
In
receiver
adjustment,
the
frequency
at
which
the
particular
adjust¬
ment
is
made
is
rarely
critical
but
the
adjustment
itself
for
maximum
signal
output
from
the
Page
15
receiver
is
frequently
quite
critical.
For
accurate
calibration
of
home
built
receivers
or
eq
iip-
ment,
pi
*ce?d
as
follows.
Make
a
rough
calibration
with
the
signal
generator.
Then,
with
a
receiver,
tu
le
in
W
VV
(Bureau
of
Standards)
at
2.5,
5,
or
10
me.
Set
the
signal
generator
to
a
suitable
sub-harmo
lie,
such
as
500
or
1000
kc,
and
adjust
the
generator
for
zero
beat.
Now
lurmonics
of
the
sh
nal
generator
occur
every
500
kc
or
1
megacycle,
and
these
harmonics
may
be
used
to
give
acci
rate
calibrations
at
points
500
or
1000
kc
apart,
such
as
2500
kc,
3000
kc
,
3500kc,
4000
kc,
etc.
These
known
frequency
points
can
be
marked
on
the
dial
of
the
equipment
being
calibrated.
T
le
object
of
the
rough
calibration
is
merely
to
furnish
a
means
of
identifying
for
example,
the
3(00
kc
point
from
the
2500
kc
or
3500
kc
points.
For
calibration
of
higher
frequency
equipmei
t,
a
choice
of
higher
sub-harmonic
will
reduce
the
confusion
between
the
n
ultitude
of
harmoi
ics
and
will
also
insure
adequate
signal
strength.
When
checking
the
cali¬
bration
accuracy
of
the
Heathkit
Signal
Generator,
the
most
convenient
standards
of
comparison
of
sufficient
accurac
/
are
broadcast
stations
of
known
frequency.
Crystal
oscillators
of
standard
frequency
when
zero
beat
against
WWV,
are
also
convenient
to
use
if
available.
The
use
of
re-
c
:iver
dial
calibrations
is
frequently
not
of
sufficient
accuracy
to
warrant
consideration.
Output
Voltage:
Tha
RF
signal
strength
going
into
the
output
control
depends
upon
the
strength
oi
oscillation
of
the
12.AU7
oscillator.
In
all
variable
frequency
oscillators
the
amplitude
will
vary
with
the
tunini
condenser
setting.
With
careful
design
the
variation
may
be
minimized.
In
theHeathkit
Signal
Generator,
the
variation
is
kept
down
to
a
ratio
of
about
2
1/2
to
1
on
each
band
except
band
E,
where
the
L/C
(inductance
to
capacitance)
ratio
becomes
sufficiently
un¬
favorable
that
oscillation
may
drop
off
rapidly
in
strength
when
the
condenser
is
near
maxi¬
mum
capacity.
Hov
ever,
even
on
this
band,
the
output
of
the
SG-8
is
in
excess
of
100,000
mi¬
crovolts
which
is
mare
than
sufficient
for
the
average
application
in
which
this
generator,
will
be
used.
IN
CASE
OF
DIFFICULTY
1.
Recheck
the
en
ire
wiring.
Follow
each
lead
and
color
it
on
the
pictorial
with
a
colored
pencil.
If
possible,
have
a
friend
recheck
the
wiring
for
you.
Most
cases
of
difficulty
re¬
sult
from
wrong
or
reversed
connections.
In
this
unit,
there
is
also
the
possibility
of
shorts
to
the
chassis
o
xurringon
some
of
the
bare
wire
connections
from
the
coils.
These
wires
should
be
carefi
lly
spaced
away
from
the
chassis
when
the
instrument
is
assembled.
2.
Check
the
test
load
with
an
ohmmeter
to
be
sure
there
are
no
shorts
between
the
inner
and
outer
conductor
caused
by
overheating
during
the
soldering
process.
3.
If
the
wiring
is
found
to
be
correct
and
the
signal
generator
still
refuses
to
work,
try
chang¬
ing
tubes.
It
is
possible
that
one
of
the
tubes
is
defective.
4.
Check
the
voltages.
A
voltage
chart
is
included
showing
the
normal
voltage
to
be
expected
at
the
pins
of
the
tube
sockets.
These
voltages;
were
measured
with
an
11
megohm
input
vacuum
tube
voltmeter.
A
normal
variation
of
±15%
is
to
be
expected.
With
regular
volt¬
meters,
readings
may
be
very
much
lower.
All
voltages
are
DC
unless
otherwise
indicated
.
5.
If
only
one
band
on
the
signal
generator
is
inoperative,
it
is
very
likely
that
the
coil
associ¬
ated
with
that
band
has
become
damaged.
An
ohrr
meter
connected
between
the
terminals
of
the
coil
should
show
continuity.
If
it
does
not,
one
section
of
the
winding
is
open.
VOLTAGE
CHART
TUBE
Pin
1
Pin
2
Pin
3
Pin
4
Pin
5
Pin
6
Pin
7
Pin
8
Pin
9
6C4
65
NC
6.3
AC
0
65
-0.5
1
12AU7
78
*-
2
to
-15
3.5
6.3
AC
6
3
AC
*75-85
o
CO
1
o
CO
*
■
0
0
♦
Dependent
upon
frequency.
NC
-
no
connection.
BIBLIOGRAPHY
Marcus
and
Levy;
E
lements
of
Radio
Servicing
Kiver,
Milton
S.;
How
to
Understand
and
Use
TV
Test
Instruments
Johnson,
J.
Richard;
How
to
Use
Signal
and
Sweep
Generators
Page
16
USE
OF
THE
I
F
SIGNAL
GENERATOR
This
signal
generator
can
be
used
to
align
radio
receivers.
It
furnishes
a
source
of
radio
fre¬
quency
or
modulated
radio
frequency
by
means
of
signal
generator
fundamental
frequencies
be¬
tween
160
kc
and
100
megacycles
(1
megac?
cle
equals
1000
kilocycles)
e
nd
useful
harmonics
of
the
signal
generator
may
be
used
to
over
200
megacycles.
The
RF
Signal
Generator
will
be
found
a
most
valuable
aid
to
the
radio
service
man
as
well
as
the
hobbyist.
The
day-to-day
"bread
and
b
itter"
job
of
the
signal
generator
is
receiver
align¬
ment.
To
save
time
and
money,
the
servic
e
man
or
hobbyist
should
us<
a
technique
which
can
be
applied
to
the
majority
of
sets
encountered
in
normal
work.
After
us
ing
the
technique
a
few
times,
it
becomes
virtually
a
matter
of
"second
nature"
and
so
easily
used
that
the
average
set
may
be
completely
aligned
in
a
matter
of
minutes.
The
majority
of
single
band
radio
receivers
have
nowadays
become
quite
standardized
and
there¬
fore
it
is
seldom
necessary
in
alignment
o
receivers
to
refer
to
the
specific
manufacturer's
alignment
instruction.
In
the
average
rec<
iver,
it
is
generally
only
necessary
to
take
note
of
the
IF
frequency
(most
home
radios
and
aul
Dmobile
radios
employ
a
455
KC
IF
frequency).
Figure
13
is
a
schematic
diagram
of
a
small,
single-band
superheterodyne
radio
receiver.
The
majority
of
single-band
sets
use
a
circuit
similar
to
this
one.
Variations
likely
to
be
found
are
as
follows:
(1)
Use
of
an
antenna
coil
rather
than
a
rod-type
or
loop
antenna.
(2)
Use
of
a
separate
oscillator
rather
than
a
pentagrid
converter.
(3)
Trimmer
tuning
of
IF
and
RF
stages
in
place
of
iron
core
slugs.
(4)
Use
of
an
RF
stage
ahead
of
the
mixer.
(5)
More
than
one
IF
stage.
These
variations
do
not
appreciably
affect
the
alignment
technique
and
the
following
step-by-
step
procedure
may
be
used
directly
in
most
cases:
(1)
Turn
both
the
signal
generator
and
the
receiver
on
and
allow
severa
minutes
for
both
units
to
reach
normal
operating
temperature.
(It
is
a
good
idea
to
leave
the
signal
generator
on
during
all
working
hours.)
»4
P0<NT
*C*
«00
ANTENNA
Figure
13
i
2
a۩
1ST
DETECTOR
&
OSCILLATOR
OUTPUT
TRANSFORMER
HO
-
125V
AC
-D
POWER
TRANSFORMER
SWITCH
BLACK
_I_
.05
MfO
—WvVv-
4700A.
-2W
»
5
k-
2
W
I
20
MfO
~
~20
MFO
I
.OS
*ro
MIEN
TUNER
WIRING
0
0"
•
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W
I2IAC
I2AV6
Y*2AS
1-
SPUR.
B*
POINT
V
Page
17
(£)
.
Connect
an
output
indicator
to
the
receiver.
This
may
be
an
AC
voltmeter
connected
di¬
rectly
across
the
loudspeaker
voice
coil;
however,
a
VTVM
connected
to
measure
AVCvol-
tage
is
by
far
the
most
desirable
method.
(3)
Short
ou
the
local
oscillator
tuning
circuit
temporarily.
The
simplest
way
to
accomplish
this
is
merely
by
clipping
a
short
piece
of
wire
across
the
rotor
and
stator
plates
of
the
oscillator
section
of
the
tuning
condenser.
Set
the
receiver
dial
to
the
low
frequency
end,
somewhere
near
550
KC.
(4)
Connect
the
signal
generator
to
the
antenna
terminals
of
the
receiver
or
if
the
receiver
employs
a
loop
antenna
or
rod
antenna,
couple
the
output
of
the
generator
to
the
antenna
sys¬
tem
through
a
one
or
two
turn
loop
of
wire
around
the
antenna.
In
cases
where
an
RF
stage
is
used
ahead
of
the
mixer,
connect
the
signal
generator
to
the
injection
grid
of
the
mixer
stage.
Set
the
signal
generator
to
the
IFvalue
o!
thi
set.
(455
KC
is
generallythe
accepted
standard.)
Use
a
modulated
signal
if
an
AC
voltmeter
is
employed
as
an
output
indicator.
An
unmodulated
signal
is
used
provided
the
AVC
voltage
is
used
as
an
output
indication.
(5)
Using
the
lowest
range
of
the
output
indicator,
increase
the
output
of
the
signal
generator
until
a
reading
can
just
be
obtained.
(.6)
Adjust
the
IF
transformers
for
maximum
reading
on
the
output
indicator.
Reduce
the
sig¬
nal
generator
output
as
necessary
to
keep
a
low
reading
on
the
output
indicator.
Repeat
the
adjustments
at
le
ast
once
to
correct
for
any
interaction
between
primary
and
secondary
windings
on
the
individual
transformers.
Interaction
is
most
likely
to
occur
in
sets
where
adjustment
is
by
means
of
iron-core
slugs
rather
than
trimmer
condensers.
(7)
Next,
remove
the
short
across
the
local
oscillator
and
tune
the
receiver
to
its
-highest
fre-
quenc/
setting
(somewhere
around
1600
KC).
Set
the
signal
generator
to
the
same
frequency
^
and
adjust
the-
os<
illator
trimmer
for
maximum
out
out.
(8)
Now
tune
the
rec<
iver
and
signal
generator
to
1400
KCand
adjust
the
RFtrimmer
formax-
imum
output.
(0)
Turn
.he
signal
generator
to
600
KC
and
tune
the
receiver
to
the
low
frequency
end
of
the
dial.
Now
"rock"
the
receiver
tuning
condenser
while
at
the
same
time
adjusting
the
trim-
mer
c
mdenser
for
maximum
output.
In
sets
using
especially
shaped
plates
in
the
oscillator
^section
of
the
tuning
condenser,
generally
no
trimmer
condenser
will
be
found.
Also,
in
some
jets,
the
lew
frequency
oscillator
adjustment
will
be
through
means
of
an
iron-core
slug
in
the
oscillator
coil
rather
than
a
trimmer
condenser.
(10)
Steps
7
,
8
and
9
t
hould
be
repeated
if
it
was
found
necessary
to
readjust
the
trimmer
con¬
dense!'
(or
iron-c
>re
slug)
as
directed
in
Step
9.
The
alignment
procedi
re
for
multi-band
AM
superheterodyne
receivers
is
essentially
the
same
as
outlined
above
fora
single-band
set.
First
the
IF
stages
are
aligned
using
the
same
technique
as
given
in
Steps
1
through
6.
Next,
each
RF
band
is
aligned
separately,
starting
with
the
high¬
est
frequet
cy
band
an
l
working
towards
the
lowest.
The
technique
given
may
be
used
but
with
corresponding
frequercy
settings
for
each
band.
&
If
the
oscillator
and
I
F
trimmer
condensers
for
the
different
bands
are
not
well
identified,
a
simple
technique
may
be
employed
to
locate
the
proper
adjustment
screws.
Turn
the
receiver
band
switch
to
the
highest
frequency
band
and
tune
in
a
signal,
using
a
short-.wave
station
or
a
signal
from
the
RF
generator.
Using
an
insulated
alignment
tool,
try
compressing
the
different
oscillator
trimmers
until
one
is
found
that
changes
the
tuning
of
the
signal.
Do
not
compress
the
oscillator
trimmer
condensers
by
turning
the
adjustment
screws,
just
press
the
leaves
of
the
condenser
togethei
temporarily.
This
method
will
identify
the
trimmers
for
each
band
with¬
out
drastically
changii
g
their
original
setting.
After
identifying
the
oscillator
trimmer
for
the
band
in
this
manner,
epeat
the
technique
to
identify
the
RF
trimmer.
Turn
to
the
next
band
and
reoeat
the
method
being
careful
not
to
touch
the
trimmers
already
identified.
Page
13
Should
the
oscillator
trimmer
of
the
short-wave
band
have
a
wide
tuning
range,
it
may
>e
pos¬
sible
to
pick
up
and
"peak"
a
signal
with
two
different
settings
of
the
trimmer.
Should
ihisthe
the
case,
use
the
setting
with
the
least
capacity
to
insure
that
the
oscillator
is
tuned
ai
)ve
the
incoming
signal.
FM
RECEIVER
ALIGNMENT
It
is
the
standard
practice
to
align
the
IF
amplifier
of
an
FM
receiver
(tuner)
before
aligning
the
RF
and
oscillator
sections
just
as
in
AM
receivers.
However,
the
exact
technique
of
alignment
depends
on
whether
a
limiter
discriminator
or
a
ratio
detector
is
used.
Where
a
limiter
and
discriminator
are
used,
usual
practice
is
to
align
the
IF
section
up
to
(he
input
of
the
limiter
first.
Then
align
the
discriminator
as
a
separate
step.
When
aligning
the
IF,
RF
and
oscilla¬
tor
sections,
the
grid
current
of
the
limiter
may
be
used
as
an
output
indicator.
Althougl
the
voltage
across
a
limiter
grid
resistor,
measured
with
a
VTVM,
willser/^e
in
many
cases,
it
is
not
an
ideal
indication.
A
typical
limiter
and
discriminator
stage
is
shovn
in
Figure
4.
>ro-
per
alignment
technique
for
the
complete
FM
receiver
is
as
follows:
LIMITER
Figure
14
(1)
Connect
an
output
indicator
by
(1)
attaching
a
VTVM
across
the
limiter
grid
resistor,
or
(2)
b
reaking
the
circuit
at
the
grid
of
the
limiter
and
inserting
a
microammeter
with
a
max¬
imum
range
of
around
150
microamps.
If
this
method
is
used,
be
sure
and
bypass
the
meter
with
a
.05
pfi
condenser
to
ground.
See
point
X
in
Figure
14.
(2)
Connect
a
signal
generator
to
the
input
of
the
mixer
stage
and
turn
on
both
the
signal
gen¬
erator
and
the
receiver.
A
sufficient
warm-up
time
must
be
allowed
to
permit
both
t
ie
re¬
ceiver
and
the
generator
to
reach
their
normal
operating
temperature.
In
the
case
of
FM
receivers
this
is
usually
15
to
20
minutes
before
complete
stabilization
can
be
ob
ained.
Adjust
the
signal
generator
to
the
IF
value
of
the
set.
This
is
usually
10.7
me.
1
he
un¬
modulated
RF
output
of
the
signal
generator
is
used.
(3)
P
eak
all
IF
trimmers
for
maximum
meter
readings.
If
the
IF
is
considerably
out
c
align¬
ment
so
that
very
little
meter
reading
is
obtained,
it
may
be
necessary
to
connect
t
ae
sig¬
nal
generator
to
t
ie
last
IF
stage
and
align
this
portion
of
the
circuit
first.
Then
wo-kback
toward
the
mixer
stage,
rechecking
previous
IF
adjustments
at
each
point;
Connect
a
VTVM
.etween
point
1
and
ground
as
shown
in
Figure
14.
Adjust
the
trim
neror
slug
"J"
for
max
aum
reading
using
a
low
VTVM
range.
(5)
Transfer
the
VT
VI
connection
to
point
2
and
adjust
trimmer
"H"for
a
minimumvol
meter
reading.
Page
19
(6)
Transfer
the
signal
generator
lead
to
the
antenna
terminals
and
align
the
RFand
oscillator
trimmers,
using
essentially
the
same
technique
as
is
outlined
for
AM
receiver
adjustment,
except
the
frequency
settings
will
fall
between
88
me
and
108
me.
The
output
indicator
for
this
adjustment
is
the
same
as
discussed
in
Step
1.
Lastly,
adjust
the
antenna
trimmer
for
maximum
indication
or
volume
using
the
receiver's
own
antenna
and
at
its
permanent
loca¬
tion.
'
RATIO
DETECTORS
The
following
technique
may
be
used
for
alignment
of
ratio
detector
FM
receiver
circuits.
Re¬
fer
to
Figi
re
15.
last
if
Figure
15
(1)
Connect
a
VTVM
or
high
resistance
DC
voltmeter
across
RC.
(2)
As
before,
both
receiver
and
signal
generator
should
be
allowed
to
warm
up.
The
receiver
-dial
should
be
set
to
the
low
frequency
end
(88
me)
and
the
signal
generator
adjusted
to
give
an
unmodulated
signal
at
the
receiver
IF.
Connect
the
signal
generator
to
the
input
of
the
mixer
stage
as
before.
(3)
Adjust
all
IF
trimmers
(or
slugs)
for
a
maximum
reading
on
the
meter,
using
a
low
range
and
the
least
signal
generator
output
possible.
Repeat
the
adjustments
at
least
twice
to
cor¬
rect
for
any
interaction.
Be
sure
slug
N
is
accurately
adjusted.
(4)
Connect
two
100,000
S2
1/2
watt
resistors
across
RC
(RA
and
RB)
and
connect
the
voltmeter
as
shown
in
Point
V
in
Figure
15.
(5)
Adjust
the
trimmer
(or
slug)
M
for
a
zero
output
indication
on
the
meter.
(6)
Align
the
RF
and
oscillator
stages
using
the
techniques
previously
described,
measuring
the
voltage
across
RC
as
an
output
indication.
SERVICING
BY
SIGNAL
INJECTION
THE
AUDIO
AMPLIFIER
-The
block
diagram
for
a
typical
audio
amplifier
is
shown
in
Figure
16.
Let
us
assume,
for
the
moment,
that
the
amplifier
is
"dead"
due
to
a
defective
second
audio
stage.
o
z
o
z
<L
SPEAKER
Figure
16
Page
20
In
servicing
the
equipment,
the
first
step,
of
course,
is
to
check
for
obviois
defec
ts
such
as
lack
of
B
plus,
defective
tubes
and
so
forth.
After
these
preliminary
tests
h;ve
teen
made,
the
Heathkit
RF
Signal
Generator
is
used
as
an
audio
signal
soui
ce
by
pluggingthe
output
cable
into
the
"AF-OUT"
jack.
The
level
of
the
audio
tone
obtained
is
adjusted
by
the
’
AF
IN-OUT"
con¬
trol.
The
MODULATION
control
should
be
set
in
the
"INT.
”
position.
Check
the
operation
of
the
output
stages
by
connecting
the
ground
lead
of
the
autpat
cable
to
the
chassis
of
the
amplifier
or
circuit
ground
and
touching
the
'
hot"
lead
of
the
output
cable
to
the
grid
of
first
one
output
tube
Point
Ain
Figure
16
then
to
the
ather
output
tube
Point
B
in
Figure
16.
All
of
these
tests
must
be
made
through
a
.05
pfd
condenser.
In
this
fat
hion
the
operation
of
each
output
stage
is
checked
individually.
As
each
grid
is
touched,
a
clear
audio
tone
should
be
heard
in
the
loudspeaker.
Next,
the
operation
of
the
phase
inverter
stage
can
be
checked
by
transferrii
g
the
hot
lead
(to¬
gether
with
a
.05
pfd
condenser)
to
the
input
of
this
stage
(Point
Cin
Figure
16).
Again,
a
clear
signal
should
be
heard
from
the
loudspeaker.
The
tone
should
be
louder
than
l
efore.
If
tcoloud,
the
volume
can
be
reduced,
using
the
"AF
IN-OUT"
control.
The
second
audio
stage
is
now
checked
by
transferring
the
hot
signal
generator
lead
to
the
input
of
this
stage,
Point
D
in
Figure
13.
If
this
stage
is
dead,
no
more
tone
will
be
heard
in
the
loud¬
speaker.
Having
isolated
the
trouble
to
a
specific
stage,
it
is
now
a
simple
math
r
to
check
DC
operating
voltages
and
parts
until
the
defective
component
is
found.
As
each
amplifier
stage
is
checked,
work
back
towards
the
input
stage
(first
auc
io),
a
definite
increase
in
volume
should
have
been
noted.
It
may
even
be
necessary
to
reduce
th
;
volume
using
the
control
mentioned.
This,
then,
provides
an
additional
test
technique.
A
weak
stage
can
be
identified
if
little
or
no
increase
in
volume
is
heard
as
the
"hot"
lead
is
transferred
past
the
stage.
Be
careful
when
interpreting
the
resulls
of
this
test,
for
overloading
a
stage
may
cause
apparent
loss
in
volume
even
when
the
stage
itself
is
in
good
condition.
Th
are!
are,
when
at¬
tempting
to
isolate
a
"weak"
stage,
be
sure
to
keep
the
signal
level
at
a
reas
>nal
le
point.
AN
OPEN
COUPLING
CONDENSER
may
be
ist
latedusing
this
signal
injection
te<
hnique.
Refer
to
Figure
17,
which
is
part
of
a
conventional
resistance
coupled
amplifier.
I
coupling
conden¬
ser
C-l
should
open,
little
or
no
signal
would
Retransferred
between
stages.
To
:heck
tie
con¬
dition
of
the
coupling
condenser,
it
is
first
necessary
to
connect
a
small
bloi
kin
condenser
in
series
with
the
"hot"
lead
of
the
signal
generator.
The
condenser
may
have
:
va
ue
of
.05
pfd.
The
exact
value
is
not
at
all
critical.
The
block¬
ing
condenser
permits
the
"hot"
lead
to
be
placed
on
the
plate
of
a
tube
without
danger
of
the
DC
voltage
present
injuring
circuits
within
the
gen¬
erator.
If
a
clear
tone
is
heard
when
the
"hot"
lead
is
touched
to
Point
E
but
not
when
touched
to
Point
F,
we
are
reasonably
sure
Condenser
C-l
is
open.
B
+
RADIO
RECEIVER
Referring
to
the
block
diagram
for
a
typical
small
AM
receiver,
Figure
18,
again
the
technique
of
signal
injection,
is
essentially
the
same
as
that
used
in
the
case
of
the
audio
amplifier.
That
is,
a
substitute
signal
is
injected
into
each
stai
;e
startinj
at
a
convenient
point
and
working
back
towards
the
"front"
of
the
equipment.
In
the
<
ase
of
thi
audio
amplifier,
we
work
towards
the
input
jack
of
the
amplifiei.
In
the
case
of
the
radio
receiver,
we
work
towai
ds
he
anteni
a.
There
is
one
important
dil
erence
between
using
the
signal
injection
technique
)n
n
audio
ai
lpli-
fier
and
using
the
same
technique
on
a
receiver.
In
the
case
of
the
amplifier
as
we
have
;
een,
the
audio
output
signal
ob
lined
from
the
signal
generator
was
used
exclusive
ly;
however,
vhen
trouble-shooting
a
receiver,
it
becomes
necessary
to
switch
to
an
RFaignalwl
en<
hecking
sfages
Page
21
ihead
of
the
second
<
tector.
In
addition,
the
frequei
cy
of
theRF
signal
will
have
to
be
changed
to
match
the
operatir
j
frequency
of
the
stages
being
checked.
A
rather
common
receiver
com¬
plaint
is
that
the
"set
is
dead".
When
such
a
complaint
3
caused
bya
defective
local
oscillator,
the
trouble
n
ay
prov
somewhat
difficult
to
isolate.
As
before,
the
first
step
in
servicing
the
equipment
is
to
check
for
the
obvious
defects.
A
quick
check
with
a
DC
voltn
eter
will
indicate
whether
or
not
the
power
supply
is
operating.
To
isolate
the
trouble
to
a
stage
as
rapidly
as
possible,
a
technique
which
experienced
service
men
often
employ
may
be
used.
Instead
of
stage-by-stage
testing,
the
set
is
considered
to
con¬
sist
of
major
sections
and
primarily
isolation
of
the
trouble
may
be
made
on
his
basis.
The
audio
signal
obtained
from
the
Heathkit
RF
signal
generator
may
be
used
to
inject
a
signal
at
the
input
of
the
first
audio
stage
(Point
H
in
Figure
18).
If
a
loud
clear
tone
is
heard,
we
know
im¬
mediately
that
the
entire
audio
section
of
the
receiver
is
operating
and
can
forget
about
these
stages
for
the
time
being.
Shift
the
outpt
t
c.
ble
of
the
signal
generator
to
the
RF
OUT
jack
and
adjust
the
controls
to
give
a
modulated
IF
ugnal
at
the
IF
value
for
the
receiver.
(In
most
cases
this
will
be
455
KC).
Using
a
50
mi
f
c
rnderiser
in
series
with
the
"hot"
lead,
inject
the
signal
at
the
input
of
the
IF
stage
(Point
,
in
7
igi
re
18).
The
use
of
a
small
coupling
condenser
in
this
case
is
to
minimize
detuning
of
th
?
II
and
RF
stages
for
the
signal
generato
■
lead.
If
a
tone
is
once
again
heard
in
the
loudspeak
r,
ve
know
that
the
IF
stage,
under
test,
is
in
satisfactory
operation.
Repeat
the
sif
lal
injection
tests
until
the
defective
stage
in
the
receiver
has
been
located.
From
this
point
on,
the
1
,
it
is
a
simple
matter
to
isolate
the
defective
components
causing
the
re¬
ceiver
to
be
ii
opt
rative.
Var
ations
of
a
si
;nal
injection
technique
may
be
used
for
servicing
FM
and
TV
receivers
as
well
as
the
he
ein
discussed
AM
receivers
and
audio
amplifiers.
REPLACEMENTS
Material
supplied
with
Heathkits
has
been
carefully
selected
to
meet
design
requirements
and
ordinarily
will
fulfill
its
function
without
difficulty.
Occasionally
improper
instrument
opera¬
tion
can
be
traced
to
a
faulty
tube
or
component.
Should
inspection
reveal
the
necessity
for
re¬
placement,
write
to
the
Heath
Company
and
supply
all
of
the
following
information:
A.
Thoroughly
identify
the
part
in
question
by
using
the
part
number
and
description
found
in
the
manual
parts
list.
B.
Identify
the
type
and
model
number
of
kit
in
which
it
is
used.
C.
Mention
the
order
number
and
date
of
purchase.
D.
Describe
the
nature
of
defect
or
reason
for
requesting
replacement.
The
Heath
Company
will
promptly
supply
the
necessary
replacement.
Please
do
not
return
the
original
component
until
specifically
requested
to
do
so.
Do
not
dismantle
the
component
in
Page
22
question
as
this
will
void
the
guarantee.
U
tubes
are
to
be
returned,
pack
them
carefully
to
prevent
breakage
in
shipment
as
broken
tubes
are
not
eligible
for
replacement.
This
replace¬
ment
policy
does
not
cover
the
free
replacement
of
parts
that
may
have
been
broken
or
damaged
through
carelessness
on
the
part
of
the
kit
builder.
SERVICE
In
event
continued
operational
difficulties
of
the
completed
instrument
are
experienced,
the
fa¬
cilities
of
the
Heath
Company
Service
Department
are
at
your
disposal.
Your
instrument
may
be
returned
for
inspection
and
repair
fora
service
charge
of
$3.00
plus
the
cost
of
any
additional
material
that
may
be
required.
THIS
SERVICE
POLICE
APPLIES
ONLY
TO
COMPLETED
INSTRUMENTS
CONSTRUCTED
IN
ACCORDANCE
WITH
THE
INSTRUCTIONS
AS
STATED
IN
THE
MANUAL.
Instruments
that
are
notentirely
completedor
instruments
that
are
modified
in
design
wi'l
not
be
accepted
for
repair.
Instruments
showing
evidence
of
acid
core
solder
or
paste
fluxes
will
be
returned
not
repaired.
The
Heath
Company
is
willing
to
offer
its
full
cooperation
to
assist
you
in
obtaining
the
specified
performance
level
in
your
instrument.
Factory
repair
service
is
available
for
a
period
of
one
year
from
the
date
of
purchase
or
you
may
contact
the
Engineering
Consultation
Department
by
mail.
For
information
regarding
possible
modification
of
existing
kits,
it
is
suggested
that
you
refer
to
any
one
or
more
of
the
many
publications
that
are
available
on
all
phases
of
electronics.
They
can
be
obtained
at
or
through
your
local
library,
as
well
as
at
ary
electronic
outlet
store.
Although
the
Heath
Company
sincerely
welcomes
all
comments
and
suggestions,
it
would
be
im¬
possible
to
design,
test,
evaluate
and
assume
responsibility
for
proposed
circuit
changes
for
specific
purposes.
Therefore,
such
modifications
must
be
made
at
the
discretion
of
the
kit
buil¬
der
according
to
information
which
will
be
much
more
readily
available
from
some
local
source.
SHIPPING
INSTRUCTIONS
Before
returning
a
unit
for
service,
be
sure
that
all
parts
are
securely
mounted
INSTRUMENT
AND
NG~1
ED.
|
Pack
in
a
rugged
container,
preferably
wood,
using
at
least
three
inches
of
shredded
newspaper
or
excelsior
on
all
sides.
DO
NOT
SHIP
IN
THE
ORIGINAL
KIT
CARTON
AS
THIS
CARTON
IS
NOT
CONSIDERED
ADEQUATE
FOR
SAFE
SHIPMENT
OF
THE
COMPLETED
INSTRUMENT.
Ship
by
prepaid
express
if
possible.
Return
shipment
will
be
made
by
express
collect.
Note
that
a
carrier
cannot
be
held
liable
for
damage
in
transit
if
packing,
in
HIS
OPINION,
is
insufficient.
SPECIFICATIONS
All
prices
are
subject
to
change
without
notice.
The
Heath
Company
reserves
the
right
to
dis¬
continue
instruments
and
to
change
specifications
at
any
time
without
incurring
any
obligation
to
incorporate
new
features
in
instruments
pieviously
sold.
WARRANTY
Heath
Company
warrants
that
for
a
period
of
tl
ee
months
from
the
date
of
shipment,
all
Heath
kit
parts
shall
be
free
of
defects
in
materials
and
workmanship
under
normal
use
and
service
and
that
in
fulfillment
of
any
breach
of
such
warranty,
Heath
Company
shall
replace
such
defective
parts
upon
the
return
of
the
same
to
its
factory.
The
foregoing
warranty
shall
apply
only
to
the
original
buyer,
and
is
and
shall
be
in
lieu
of
all
other
warranties,
whether
express
or
implied
and
of
all
other
obligations
or
liabilities
on
the
part
of
H
ath
Company
and
in
no
event
shall
Heath
Company
be
liable
for
any
anticipated
profits,
c
>nseq
ential
damages,
loss
of
time
orotner
losses
incurred
by
the
buyer
in
connection
with
thepurchas
*,
assembly
or
operation
of
Heathkits
or
components
thereof.
No
replacemer
shall
be
made
oj
parts
damaged
by
the
buyer
in
.he
course
of
handling
or
assembling
Heath!
t
equipment.
NOTE:
The
foregoing
warranty
is
comp
;tely
void
and
we
will
not
replace,
repair
or
sen
ce
instruments
or
parts
thereof
in
which
ai
1
core
solder
or
paste
fluxes
have
been
used.
HEATH
COMPANY
PART
PAI
TS
DESCRIPTION
PART
PARTS
DESCRIPTION
No.
Per
Kit
%
No.
Per
Kit
Resistors
s
Sockets-
Knobs-Jacks
a*
1-1
2
47
r
*
100-M10
1
Indicator
assembly
^
1-4
1
330
R
<
432-3
3
Shielded
connector
|
.
"
1-7
2
680
r
434-15
1
7-pin
miniature
socket
-
1-9
1
1
KR
434-16
1
9-pin
miniature
socket^
-
"^
1-3A
1
3.3
KR
1
watt
434-22
1
Pilot
light
socket
!
•
1-18
1
5600
R
462-18
1
Skirtless
knob/''
1-21
1
15
KR
f
■
462-19
5
Skirted
knob
^
1-24
1
33
KR
1-26
2
100
KR
Hardware
1-32
1
390
KR
250-2
4
3-48
x
1/4
screw
1-33
1
470
KR
^
250-7
3
6-32
x
3/16
screw
Condensers
21-3
1
21-7
1
21-11
1
21-16
6
21-27
1
23-8
1
23-28
1
25-
7
1
26-
1
7
1
10
fj
ni
(.00001
/xfd)
33
p
/xf
(.000033
/xfd)
150
/x/xf
(.00015
.01
/xfd
.005
fifd
(5000
/x/xf)^
.02
/xfd
.1
/xfd
20-20
/xfd
150
v
450
/x/xf
dual
tuning
Controls-Swi
ches
10-32
19-18
63-67
63-69
63-70
1
1
1
1
1
1
megohm
control^'
1
KR
control
with
switch^'
250-8
250-9
250-13
250-15
250-
8
3
251-
1
252-
1
252-3
252-
7
253-
1
0
253-
2
2
254-
1
254-4
259-1
2
8
1
1
2
2
4
20
5
4
3
17
5
5
#6x3/8
sheet
metal
screw
6-32
x
3/8
screw
6-32
x
1
screw
8-32
x
1/8
set
screw
#10
x
1/2
handle
screw
6-32
spade
bolt
3-48
nut
6-32
nut
Control
nut
Control
nickel
washer
3/4
flat
washer
#6
lockwasher
Control
lockwasher
#6
solder
lug
5
position
band
switch
2
Dosition
modulation
switcli/Cbps-Plugs-
1
3
position
attenuator
switch*'
89-1
207-3
Coils-Chokes
Transformers
40-47A
40-47B
40-47C
40-47D
10-47E
46-1
54-2
1
1
1
1
1
1
1
Oscillator
coil
band
A
Oscillator
coil
band
B
Oscillator
coil
band
C
Oscillator
coil
band
D
Oscillator
coil
band
E
AF
choke
^
*
■
'
Power
transformer
IS
260-1
340-2
343-
3
344-
1
345-
1
346-
1
432-1
1
2
1
1
1
1
1
1
Line
cord
1/8"
cable
cl;
Alligator
clip
length
#20
bare
wire
length
Shielded
test
lead
!•
roll
Hookup
length
Shield
braid
length
Spaghetti
(sleeving)
Shielded
plug
Chassis-Panel-Manual
rubes-Lamps
-Rectifiers
57-2
1
Seleni
IS
111-4
111-
25
112
-
1
1
1
1
6C4
tube
12AU7
tube
#47
pilot
light
90-14
200-M54
200-M55
1
1
1
203-26F67
1
ix
/
211-4
595-73
1
1
Cabinet
Chassis
Sub-chassis
Panel
Handle
Instruction
Manual
Grommets-Feet-Terminal
Strips
73-1
261-1
431-2
431-3
6
4
2
2
3/8
Rubber
feet
2-
l
ug
terminal
strip
3-
l
ug
terminal
strip
Page
24
Other manuals for Heathkit SG-8
2
Table of contents
Other Heathkit Portable Generator manuals
