Heathkit Heathkit SG-8 Installation instructions
Q.
595-73
i
ASSEMBLING
AND
USING
YOUR
..
BENTON
HARBOR,
MICHIGAN
-4
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-
PRICE
$ .00
1^
STANDARD
COLOR
CODE
—
RESISTORS
AND
CAPACITORS
DISC
CERAMIC
RMA
CODE
3-Dot
Tolerance
------
Temp.
Coeff.
HICAP
Temp.
Coeff.
£
------
2nd
Figure
Tolerance
u
TC
Multiplier
Tolerance
AXIAL
LEAD
CERAMIC
CAPACITOR
Temp.
Coeff.
Capacity
2nd
Figure
I
Multiplier
J
Tolerance
Multiplier
MOLDED
MICA
TYPE
CAPACITORS
Multiplier
Significant
Figure
Working
Voltage
Significant
Figure -----
Multiplier
Significant
Figure
MOLDED
PAPER
TYPE
CAPACITORS
TUBULAR
CAPACITOR
Working
Volts
Figure
--------
Multiplier
Tolerance
—
I
Tolerance
Significant
Figure
MTIll
illllll
A
2
digit
voltage
rating
indicates
more
than
900
V.
Add
2
zeros
to
end
of
2
digit
number.
—
Working
Voltage
=>
Rear
------
Tolerance
Significant
Figure
__
Multiplier
Working
------
Voltage
<=
Normally
stamped
for
value
JAN
&
948
RMA
CODE
Black
Body
RMA
3-DOT
(OBSOLETE)
RATED
500
W.V.D.C.
±
20%
TOL.
5-Dot
__
.
Capacity
—
Multiplier
->
st
(
Significant
2nd
The
tolerance
rating
of
capacitors
is
determined
by
the
color
code.
For
example:
red
=
%,
green
=
5%,
etc.
The
voltage
rating
of
capacitors
is
obtained
by
multiplying
the
color
value
by
100.
For
example:
orange
=
3
X
100
or
300
volts.
Blue
=
6
X
100
or
600
volts
st
nd
SECOND
HING
END
COLOR
Second
Figure
Voltage
(Opt.)
None
6
00
,000
0,000
00,000
000,000
0,000,000
00.000,000
000,000,000
Ta
\
Digit
J-?2nd
Digit
INSULATED
UNINSULATED
Color
BTACK
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
FIRST
RING
BODY
COLOR
First
Figure
0
1
3
4
5
6
7
8
9
RADIAL
LEAD
DOT
RESISTOR
Multiplier
MOLDED
FLAT
CAPACITOR
Commercial
Code
Tolerance
D
“
Tolerance
AXIAL
LEAD
RESISTOR
Brown
—
Insulated
Black
—
Non-insulatcd
Temp
—
Coeff.
BY-PASS
COUPLING
CERAMIC
CAPACITOR
Capacity
I-V4-4
JAN.
CODE
CAPACITOR
Silver
2nd
I
Significant
st
£
Voltage
Figure
^7
—
st
Figure
0
1
3
4
5
6
7
8
9
-I
—
Multiplier
Courier/
of
Centralob
THIRD
RING
I
DOI
’
COLOR
.Multiplier
Mu,
‘
r
P
,ier
Characteristic
BUTTON
SILVER
MICA
CAPACITOR^T
Class
-------------
Tolerance
Multiplier
3rd
digit
RMA
4-DOT
(OBSOLETE)
-----
Multiplier
Tolerance
—
f
L
—
Blank
Jn
the
design
of
Heathkits,
the
temperature
coefficient
of
ceramic
or
mica
capacitors
is
not
generally
a
critical
factor
and
there
fore
Heathkit
manuals
avoid
reference
to
temperature
coeffi
cient
specifications.
-------
st
[
----
2nd
EXTENDED
RANGE
TC
CERAMIC
Capacity
Illi
—
®
®
---------
Tolerance
—
Multiplier
st
2nd
J
i:
Working
Voltage
I
The
physical
size
of
carbon
resistors
is
determined
by
their
wattage
rating.
Carbon
resistors
most
commonly
used
in
Heath
kits
are
watt.
Higher
wattage
rated
resistors
when
specified^"
are
progressively
larger
in
physical
size.
Small
wire
^wpffiid
resistors
x
/z
watt,
1
or
watt
may
be
colp^cdded
buCthc
first
band
will
be
double
width.
■
I
\
i
-------
1
I
-----
Tolerance
RMA
(5-DOT
OBSOLETE
^ODE)
Significant
Figure
v
x
-------
Multiplier
=>
Front
5-DOT
RADIAL
LEAD
CERAMIC
CAPACITOR
—
I
—
Capacity
If
-pc
Multiplier
___
2^
Significant
Figure
-------
Multiplier
-
Tolerance
T
f
—
2nd
■
st
RMA
6-DOT
(OBSOLETE)
/
--------
lsf
I
/
.
-------
2nd
^-Significant
Figures
J
/
r
~
3rd
)
--------
Multiplier
|
*
—
Tale
rance
---------
'Working
Voltage
RADIAL
LEAD
(BAND)
RESISTOR
I
—
Multiplier
st
Figure
;
|
I
—
Tolerance
|
Multiplier
st
and
2nd
Significant
Figures
Wire
wound
resistors
have
st
digit
band
double
width
CURRENT
STANDARD
CODE
White
(RMA)-
-
Black
(MN)
Class
I
—
Tot
The
standard
color
code
provides
all
necessary
information
re
quired
to
properly
identify
color
coded
resistors
and
capacitors.
Refer
to
the
color
code
for
numerical
values
and
the
zeroes
or
multipliers
assigned
to
the
colors
used.
A
fourth
color
band
on
resistors
determines
tolerance
rating
as
follows:
Gold
=
5%,
silver
=
10%.
Absence
of
the
fourth
band
indicates
a
0%
tolerance
rating.
I
ASSEMBLY
AND
OPERATION
OF
THE
HEATHKIT
SIGNAL
GENERATOR
SG-8
MODEL
SPECIFICATIONS
across
1
megohm
Ji
!
Frequency
Range
Band
A
......................
Band
B
......................
Band
C
......................
Band
D
......................
Band
E
......................
Calibrated
Harmonics.
.
Radio
Frequency
Output
Modulation
Frequency.
.
Audio
Output
...................
Audio
Frequency
Input.
.
Tubes
1 AU7
........................
6C4
............................
Power
Requirements.
.
.
Cabinet
Size
......................
Shipping
Weight
...............
RF
Oscillator-Buffer
Audio
Oscillator
or
Audio
Amplifier
.105-1 5
v,
50/60
cycles
5
1/
wide
x
6
1/
high
x
5
deep
.7
lbs.
160
kc
to
500
kc
500
kc
to
1650
kc
1.65
me
to
6.5
me
6.5
me
to
5
me
5
me
to
110
me
110
me
to
0
me
In
excess
of
100,000
microvolts
Approximately
400
cycles
to
3
volts
Approximately
5
v
‘‘
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Page
3
i
R
I
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.
At
the
same
time
the
audio
voltage
is
also
applied
to
the
external
audio
connector
marked
OUT
,
and
may
be
used
as
an
audio
signal
source
for
testing
amplifiers,
etc.
With
the
modulation
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
604
audio
oscillator
tube
then
becomes
an
am
plifier
stage
for
the
external
signal.
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
ahd
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
at
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
voltage
is
impressed
as
an
amplitude
modulated
signal
upon
the
RF
output
from
the
cathode
follower
.
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.
CIRCUIT
DESCRIPTION
The
RF
portion
of
the
SG-8
Signal
Generator
consists
of
a
1 AU7
twin
triode
tube.
One
triode
section
of
this
tube
is
used
as
a
Colpitts
oscillator.
Theother
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
5
to
100
mega
cycles.
V
I
4
I
—
I
•
We
strongly
urge
that
you
follow
the
wiring
and
parts
layout
shown
in
the
manual.
The
position
Page
4
i
A
i
i
I
i
:•
i
1
I
1
A
■
i
«
*
'
I
}
4
I
■■
j
!
<
I
A
unique
design
feature
is
the
convenient
AF
IN-OUT
control,
which
adjusts
audio
input
if
ex
ternal
modulation
is
employed
and
likewise
adjusts
theAF
output
level
when
using
the
generator
as
a
source
of
audio
output.
PRELIMINARY
INSTRUCTIONS
AND
NOTES
The
Heathkit
model
SG-8
Signal
Generator
when
constructed
in
accordance
with
the
instructions
in
this
manual,
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.
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
.
megohm
resistor
has
been
supplied
in
place
of
a
megohm
as
shown
in
the
parts
list.
These
changes
are
self-evident
and
are
mentioned
here
only
to
prevent
confusion
in
check
ing
the
contents
of
your
kit.
UNPACK
THE
KIT
CAREFULLY
AND
CHECK
EACH
PART
AGAINST
THE
PARTS
LIST.
In
so
doing,
you
will
become
acquainted
with
each
part.
Refer
to
the
charts
and
other
information
shown
on
the
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.
The
power
supply
consists
of
a
transformer
which
furnishes
filament
voltage
to
the
6C4
and
1 AU7
tubes,
and
effectively
isolates
the
instrument
from
the
AC
line.
A
selenium
rectifier
is
connected
to
one
winding
of
the
transformer
producing
half-wave
rectification.
An
RC
filter
network
changes
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.
This
manual
is
supplied
to
assist
you
in
every
way
to
complete
the
signal
generator
with
the
least
possible
chance
for
error.
We
suggest
that
you
take
a
few
minutes
now
and
read
the
en
tire
manual
through
before
any
work
is
begun.
This
will
enable
you
to
proceed
with
the
work
much
faster
when
construction
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
manual
in
your
files
for
future
reference,
both
in
the
use
of
the
signal
generator
and
for
its
maintenance.
Resistors
and
condensers
generally
have
a
tolerance
rating
of
± 0%
unless
otherwise
stated
in
the
parts
list.
Therefore
a
100
KQ
resistor
may
test
anywhere
from80Kf
tol 0KQ.
(The
let
ter
K
is
commonly
used
to
designate
a
multiplier
of
1000.)
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.
Read
the
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:
ALL
GUARANTEES
ARE
VOIDED
AND
WE
WILL
NOT
REPAIR
OR
SERVICE
INSTRUMENTS
IN
WHICH
ACID
CORE
SOLDER
OR
PASTE
FLUXES
HAVE
BEEN
USED.
WHEN
IN
DOUBT
ABOUT
SOLDER,
IT
IS
RECOMMENDED
THAT
A
NEW
ROLL
PLAINLY
MARKED
’
’
ROSIN
CORE
RADIO
SOLDER
”
BE
PURCHASED.
NOTE:
We
suggest
that
you
execute
the
following
preparations
before
any
work
is
started:
1.
2.
3.
ASSEMBLY
OF
SUB-CHASSIS
A
I
Figure
Figure
1
Page
5
1
of
wires
and
parts
is
extremely
critical
in
circuits
operating
at
high
frequencies,
and
changes
may
seriously
affect
the
characteristics
or
calibration
of
the
signal
generator.
STEP-BY-STEP
ASSEMBLY
INSTRUCTIONS
The
following
instructions
are
presented
in
a
simple,
logical,
step-by-step
sequence
to
enable
you
to
complete
your
kit
with
the
least
possible
confusion.
Be
sure
to
read
each
step
all
the
way
through
before
starting.
When
a
step
is
completed,
check
it
off
in
the
space
provided.
This
makes
it
easy
to
resume
construction
after
your
work
has
been
interrupted.
i
f
Select
from
the
large
fold-in
pictorials
included
with
the
manual
the
diagram
showing
the
phase
of
construction
you
are
engaged
in
at
the
time.
Attach
this
diagram
to
the
wall
above
your
work
space.
After
identifying
the
parts
from
the
parts
list,
lay
them
out
in
a
large
shallow
box
so
that
they
are
readily
accessible.
This
will
save
considerable
time
in
construction.
Read
thoroughly
the
assembly
and
wiring
instructions
on
the
inside
rear
cover
of
the
manual
and
refer
to
the
general
information
on
both
inside
covers
of
the
manual
to
identify
the
parts.
Unless
otherwise
stated,
6-3
screws,
lockwashers
and
nuts
are
used
in
mounting
of
parts.
Wire
is
to
be
insulated
unless
otherwise
specified.
Insulated
sleeving
is
to
be
used
on
bare
wires
when
called
for.
Leads
on
condensers,
transformers,
and
resistors
are
generally
much
longer
than
they
need
be
to
make
the
indicated
connections.
In
these
cases,
the
excess
leads
should
be
cut
off
as
the
parts
are
added
to
the
chassis.
Not
only
does
this
make
the
wiring
much
neater
but
in
radio
frequency
work,
the
excess
length
of
leads
may
actually
create
tuned
parasitic
circuits
at
un
desired
frequencies.
o
‘
‘
Mas
NOTE:
In
assembling
the
kit,
use
lockwashers
under
all
nuts
unless
a
solder
lug
is
used.
The
3-48
screws
and
nuts
used
in
mounting
the
miniature
tube
sockets
are
the
only
exception
to
this
rule.
1
I
()
!
)
(
(
)
)
(
1
i
©
o
o
o
o
n
'tf
.
0
B
0
w
B
(
CC
n
T
p
CL
CK**SHtR
=0
‘
i
SWITCHES
I
I
j
I
Page
6
I
s
I
I
I
•H
I
I
I
•
Mount
a
9-pin
miniature
socket
Ron
the
sub
chassis,
using
3-48
screws
and
nuts.
Posi
tion
as
shown
in
Figures
1
and
.
Figure
3
Mount
the
tuning
condenser
as
shown
in
Figures
1
and
,
using
3/16
6-3
Screws
with
lock
washers
under
the
heads.
(
)
Mount
a
cable
clamp
on
the
bottom
mounting
screw
of
coil
A
as
shown
in
Figure
,
using
an
additional
6-3
nut
to
secure
it.
Mount
two
6-3
spade
bolts
on
the
sub-chas
sis
aprons
as
shown
in
Figure
.
Method
of
mounting
is
shown
in
Figure
3.
I
I
I
I
I
i
u
4
4
I
’
-
1
J
*
IL
I
V
1
‘
*
i
;
<
HOW
TO
Figure
5
WIRING
THE
SUB-CHASSIS
NOTE:
Before
beginning
the
wiring,
refer
again
to
the
notes
on
wiring
and
soldering
on
the
in
side
rear
cover
of
the
manual.
We
cannot
stress
too
strongly
the
importance
of
careful
wiring
and
soldering
when
applied
to
radio
frequency
circuits.
In
building
this
signal
generator
you
will
use
a
considerable
amount
of
bare
wire.
Care
should
be
taken
to
avoid
possible
shorts
to
the
chassis
or
other
components.
The
leads
should
be
kept
short
and
straight
when
possible.
Soldering
should
be
done
with
a
great
deal
of
care,
so
that
fluxes
will
not
run
over
onto
adjacent
insulation,
thus
causing
leakage
and
a
possible
source
of
trouble.
Figure
4
)
Referring
to
Figure
4
for
coil
identification,
and
Figure
1
for
coil
position,
mount
the
coils
A,
B,
C
and
D.
Referring
to
Figure
,
note
that
coil
C
has
a
3-lug
terminal
strip
mounted
on
its
lower
mounting
screw,
and
coil
A
has
a
solder
lug
on
its
upper
mounting
screw
.
Use
lockwashers
on
all
coil
mounting
screws
except
the
one
having
the
solder
lug.
MC«tl
WASH
[ft
CCMftOL
NU1
©
Components
are
given
code
designations
so
that
the
identification
of
parts
on
both
the
diagrams
and
on
written
matter
is
easily
defined.
The
switch
terminals
are
numbered
in
such
a
manner
that
if
the
switch
were
viewed
from
the
front,
the
numbering
system
would
progress
in
a
clock
wisedirection
around
the
switch.
The
band
switch
sections
are
referred
to
asBForBR,
corre
sponding
to
the
front
and
rear
sections
of
the
switch
when
viewed
from
the
shaft
end.
The
tube
sockets
are
also
numbered
in
a
clockwise
direction,
as
viewed
from
the
bottom,
starting
from
the
gap
between
the
socket
terminals.
Thus
a
reference
to
R4
refers
to
the
number
4
terminal
on
socket
R,
counted
from
the
first
terminal
to
the
left
of
the
open
space
between
terminals
1
and
9
on
that
particular
socket.
In
wiring
the
sub-chassis,
reference
to
Pictorials
1
and
will
illustrate
the
placement
of
all
parts
and
leads.
to
:
-
MOUNT
CONTROLS
&
Mount
the
band
switch
B,
using
a
control
lockwasher
and
control
nut.
Omit
the
flat
washer.
Position
as
shown
in
Figure
.
See
Figure
5
for
method
of
mounting
controls.
G
G
//
f
o
>
Page
7
r
■
I
0
o
a.
O
J
«
O
H
U
►
—
<
0<
-1
<
>
—
<
o
H
O
►
—
<
A
o
©
o
°o
o°,
(S)
means
solder.
(NS)
means
do
not
solder
yet.
)(
Co
meet
a
33
KQ
resistor
from
TAI
(NS)
to
TA
(NS).
)
(
Connect
a
470
Kft
resistor
from
TA
(NS)
to
R
(NS).
(
)
Connect
a
150
ggf
ceramic
condenser
from
TA
(NS)
to
R
(NS).
)
Connect
a
10
g/if
ceramic
condenser
from
R
(S)
to
R6
(NS).
(
)
Connect
a
1
KS
resistor
from
R3
(S)
to
TA3
(NS).
(
)
Connect
a
6
”
length
of
wire
to
TA3
(S).
(
Leave
the
other
end
free.
)
Connect
a
100
KQ
resistor
from
TA
(S)
(use
sleeving)
to
the
solder
lug
(NS).
(
(
I
•
(
Leave
‘
if
'
(
)
Connect
a
short
bare
wire
from
R4
(S)
to
R5
(NS).
(
)
Connect
a
wire
about
4"
long
to
R5
(S).
Leave
the
other
end
free.
i
(
)
Connect
a
bare
wire
from
R6
(S)
to
CC
(S).
(
)
Connect
a
33
gpf
ceramic
condenser
from
CC1
(S)
to
R7
(NS).
(
)
Connect
a
15
KJ
resistor
from
R7
(S)
to
the
solder
lug
(NS).
(
)
Connect
a
short
bare
wire
from
R8
(S)
to
the
solder
lug
(NS).
(
)
Connect
a
short
bare
wire
from
R9
(S)
to
the
solder
lug
(S).
(
)
Connect
a
bare
wire
to
R1
(S).
Cover
with
a
1/ "
length
of
sleeving.
Run
wire
through
hole
S
to
Cl
(NS).
(
)
Connect
a
piece
of
bare
wire
7
1/ "
long
to
Al
(S).
Slip
a
1
7/16"
length
of
sleeving
over
(
)
Connect
a
short
bare
wire
from
BR1
on
the
band
switch
(S)
to
BF1
(S).
if
(
)
Connect
a
bare
wire
from
BF1
(S)
to
A
(S).
(S)
to
B
(S).
(
)
Connect
a
bare
wire
from
BF
*
(S)
to
C
(S).
)
Connect
a
bare
wire
from
BF3
(
(S)
to
D
(S).
)
Connect
a
bare
wire
from
BF4
(
)
Connect
a
bare
wire
from
BRI
(S)
to
A3
(S).
(
)
Connect
a
bare
wire
from
BR
(S)
to
B3
(S).
(
Page
8
i
I:
!
T
'
t
‘
i
*1
I
1i
H
this
wire
and
run
through
Bl
(S),
add
a
4
1/
”
length
of
sleeving
and
run
through
Cl
(S),
add
a
1
1/8
”
length
of
sleeving
and
connect
to
DI
(NS).
5
if
-
)
Connect
a
wire
about
9
”
long
to
TAI
(S).
Run
wire
as
shown
in
Pictorial
through
the
cable
clamp.
Leave
the
other
end
free.
)
Connect
a
wire
about
9"
long
toR4
(NS).
Run
wire
as
shown
through
the
cable
clamp,
the
other
end
free.
(
)
Connect
a
bare
wire
from
BR3
(S)
to
C3
(S).
(
)
Connect
a
bare
wire
from
BR4
(S)
to
D3
(S).
(
)
Connect
coil
E3
from
BF5
(S)
to
BR5
(S).
i
(
(
)
Connect
coil
El
from
BF6
(S)
to
CC3
(S).
(
)
Connect
coil
E
from
BR6
(S)
to
CC4
(S).
This
completes
the
sub-chassis
wiring.
ASSEMBLY
OF
CHASSIS
Oo
Oo
Oo
Oo
o
e
e
Figure
6
NOTE:
Refer
to
Figure
6.
(
)
Install
3/8
rubber
grommets
in
holes
A,
C,
D,
E,
F
and
P.
(
)
Position
as
shown
(
)
Page
9
X
If
:«
Mount
a
7-pin
miniature
socket
in
hole
G,
using
'3-48
screws
and
nuts,
in
Figure
6.
I
i
I
!
©
Q
O
o
1
fol
®
rmP)
3
)
)
Cover
one
bare
lead
from
coil
E3
with
a
3
1/
”
length
of
sleeving,
and
connect
to
DI
(S)
.
Leave
the
other
end
free.
Mount
the
seleniuip,
rectifier
with
the
side
having
the
plus
or
cathode
marking
facing
out
ward
from
the
back
of
the
chassis.
Use
a
1
”
6-3
screw
through
the
dimpled
hole
in
the
rear
apron
of
the
chassis.
Fasten
with
a
lockwasher
and
nut.
Position
as
shown
in
Figure
6.
0°
A'
l®
2
♦
(
)
Mount
the
power
transformer
on
top
of
the
chassis
opposite
the
audio
choke.
i
I
■
2
3
©
,39OK
.01
5
II
12
2
YELLOW
SOCKET
330
00
4
WHITE
I
BLACK
I
©
1
PICTORIAL
3
Page
10
i
II
I
I
I
Position
the
transformer
in
such
a
manner
that
the
red
and
yellow
leads
pass
through
the
grommet
near
est
the
chassis
edge.
rflw
u.
20-20
MFD
I5OV
I
»
♦
i'
I
TO
TA3
Tl
7
r
47.
•J
.1
I
r
•I
I
o
m.
■J
d
2
\U2
TAI
&
ill
W
mfd
ML
^1
II
\
IO
111
L
MF°
(
)
Mount
the
sub-chassis
to
the
chassis
by
inserting
the
sub-chassis
spade
bolts
through
the
small
holes
on
either
side
of
the
large
chassis
cutout.
Care
must
be
taken
to
prevent
dam
age
to
the
E
band
coils
at
this
time.
Lower
the
sub-chassis
through
the
hole
at
a.
slight
•
angle
to
clear
the
E
band
coils,
and
at
the
same
time
permit
the
band
switch
shaft
to
drop
down
into
the
slotted
hole
in
the
front
of
the
chassis.
(
)
Mountthe
audio
choke
on
top
of
the
chassis
to
the
rear
of
the
tube
socket.
Use
3/8
6-3
screws,
placing
a
solder
lug
under
the
nut
nearest
the
tube
socket
and
the
lockwasher
under
the
other
nut.
Position
the
solder
lug
as
shown
in
Figure
6.
l
6B0,
33K
-IW
©
(
)
On
the
back
mounting
screw
of
the
transformer,
place
a
solder
lug
on
the
under
side
of
the
chassis.
Position
as
shown
in
Figure
6.
(
)
On
the
front
mounting
screw,
mount
a
-lug
terminal
strip
TC.
Position
as
shown
in
Figure
6.
Use
a
lockwasher
under
the
nut.
(
)
Using
3/8
6-3
screws,
mount
a
solder
lug
at
hole
H
and
a
3-lug
terminal
strip
TB
at
hole
J,
using
a
lockwasher
on
the
latter.
Position
as
shown
in
Figure
6.
3
2*
(
(
Posi-
(
(
(
(
)
(
)
(
)
Mount
the
1
KS
control
M
in
hole
M,
and
position
terminals
as
shown
in
Pictorial
3.
GROUND
PILOT
Figure
8
()
Connect
the
other
black
wire
to
TB1
(NS).
(
)
()
Connect
a
.01
gfd
ceramic
condenser
from
TB
(NS)
to
the
same
solder
lug
(S).
()
(
)
Page
11
)
Solder
a
1
3/4
”
length
of
shield
braid
directly
on
the
chassis
and
sub-chassis
as
shown
in
Pictorial
3.
)
Mount
the
pilot
light
in
the
upper
right
panel
hole,
as
viewed
from
the
front.
See
Figure
7
for
method
of
mounting.
)
Mount
the
three
shielded
connectors
in
the
holes
marked
AF
IN,
AF
OUT,
and
RF
OUT
.
See
Figure
8
for
method
of
mounting.
)
Referring
to
Pictorial
3,
place
a
solder
lug
on
the
right
hand
spade
bolt
as
viewed
from
the
bottom,
add
a
6-3
nut
and
tighten.
)
On
the
left
hand
spade
bolt,
place
a
-lug
terminal
strip
TD,
a
lockwasher
and
nut.
tion
as
shown
in
Pictorial
3.
Mount
the
two
position
EXT-INT
modulation
switch
in
hole
K.
Position
terminals
as
shown
in
Pictorial
3.
Mount
the
1
megohm
potentiometer
L
in
hole
L,
and
position
terminals
as
shown
in
Picto
rial
3.
Connect
a
.01
iiid
ceramic
condenser
from
TB3
(NS)
to
the
solder
lug
on
the
opposite
side
of
hole
F
(NS).
t
Connect
either
red
wire
from
the
transformer
to
the
negative
selenium
rectifier
terminal.
(The
terminal
nearest
the
chassis.
)
(S).
Twist
the
two
black
wires
from
the
power
transformer
together
and
connect
either
wire
to
TB3
(NS).
LIGHT
ASSEMBLY
Figure
7
Mount
the
three
position
attenuator
switch
N
in
hole
N,
and
position
terminals
as
shown
in
Pictorial
3.
NOTE:
The
controls
are
mounted
through
both
the
chassis
and
panel
and
hold
the
panel
to
the
chassis.
Refer
to
Figure
5
for
method
of
mounting
controls.
The
controls
are
lettered
the
same
as
the
hole
markings
on
Figure
6.
WIRING
OF
CHASSIS
NOTE:
Exercise
care
when
wiring
chassis
to
avoid
damage
to
E
band
coils.
(
)
Connect
the
other
red
wire
to
the
solder
lug
directly
below
the
rectifier
(NS).
(
)
Connect
either
yellow
wire
from
the
transformer
to
this
solder
lug
(NS).
(
)
Connect
the
single
negative
wire
to
the
solder
lug
(S).
(
)
Connect
the
two
positive
wires
of
the
condenser
to
TCI
and
TC
(NS).
(
)
Connect
a
wire
from
the
positive
rectifier
terminal
(S)
to
TC
(NS).
(
)
Connect
a
3.3
Kft
1
watt
resistor
from
TC
(S)
to
TCI
(NS).
(
)
Connect
a
.005
jxfd
disc
ceramic
condenser
from
TCI
(NS)
to
the
adjacent
solder
lug
(NS).
Connect
one
pair
of
wire
ends
to
the
two
switch
Connect
one
wire
to
TB1
I
c©
o
©
Page
1
PICTORIAL
4
!
J
I
■
i
?■
.■
i
•i
■
(
)
Twist
two
wires
about
10
”
long
together,
terminals
on
the
back
of
control
M
(S).
(
)
Run
the
other
yellow
lead
as
shown
in
Pictorial
3,
through
the
grommet
P.
Leave
the
other
end
free.
i
I
I
1
©
(So
(
)
The
0- 0
gfd
150
volt
filter
condenser
has
two
leads
on
the
end
marked
’
’
positive,
”
and
one
lead
on
the
other
end.
The
condenser
is
mounted
between
the
solder
lug
and
the
ter
minal
strip
TC
as
shown
in
Pictorial
3.
SO
(
)
Run
the
wires
as
shown
in
Pictorial
3
to
the
terminal
strip
TB.
(S).
(
)
Connect
the
other
wire
to
TB
(NS).
(
)
Connect
a
47
£
resistor
from
Nil
(NS)
to
N5
(NS).
(
)
Connect
a
47
ft
resistor
from
Nil
(S)
to
N3
(NS).
(
.
)
Connect
a
680
ft
resistor
from
N3
(S)
to
N5
(NS).
(
)
Connect
a
680
ft
resistor
from
N5
(S)
to
N7
(NS).
(
)
Connect
(
)
Connect
a
bare
wire
to
N
(S).
Cover
wire
with
a
1/
”
length
of
spaghetti.
(
)
Connect
the
free
end
of
the
yellow
transformer
wire
to
the
rear
pilot
light
terminal
(NS).
(
)
Connect
the
remaining
bare
wire
of
coil
E3
to
TCI
(NS).
(Use
sleeving.
)
Run
wire
along
rear
of
chassis
as
shown
in
Pictorial
3,
to
TD1
(
)
Connect
a
short
bare
wire
from
G1
(S)
to
K1
(S).
(
)
Connect
the
free
end
of
the
wire
coming
from
R4
(see
Pictorial
)
to
G3
(S).
(
)
Connect
the
free
end
of
the
wire
coming
from
TAI
(see
Pictorial
)
to
TD
(NS).
(
)
Connect
a
short
bare
wire
from
G4
(S)
to
the
solder
lug
adjacent
to
the
tube
socket
(NS).
(
)
Connect
a
.01
gfd
ceramic
condenser
from
G5
(NS)
to
TD
(S).
(
)
Connect
a
5600
ft
resistor
from
G5
(S)
to
TD1
(S).
(
)
Connect
a
100
Kft
resistor
from
G6
(NS)
to
the
solder
lug
(NS).
(
)
Connect
a
.01
gfd
ceramic
condenser
from
G6
(S)
to
K
(S).
(Use
sleeving.
)
(
)
Connect
a
330
ft
resistor
from
G7
(S)
to
the
solder
lug
(NS).
(
)
Connect
a
390
Kft
resistor
from
K8
(NS)
to
K10
(S).
L
(
)
Slip
Page
13
i
I
I
a
7/8
”
length
of
spaghetti
over
each
lead
of
the
.01
gfd
ceramic
condenser,
and
connect
the
condenser
from
K8
(S)
to
L3
(NS).
a
bare
wire
to
N7
(S).
Cover
with
a
1
1/
”
length
of
spaghetti
and
connect
to
M
(S)
.
(
)
Connect
a
bare
wire
to
Ml
(S).
f<un
the
wire
through
Nil
(NS)
to
the
solder
lug
adjacent
to
the
large
panel
cutout
(S).
(
)
Connect
the
free
end
of
the
wire
coming
from
R5
(see
Pictorial
)
to
the
same
pilot
light
terminal
(S).
(
)
Connect
the
free
end
of
the
wire
coming
from
TA3
(see
Pictorial
)
to
M3
(S).
Run
wire
as
shown
in
Pictorial
3.
(
)
Connect
a
short
bare
wire
from
the
lug
on
the
RF
OUT
connector
(S)
to
the
pilot
light
ter
minal
nearest
the
panel
(S).
(
)
Connect
a
wire
to
TCI
(S).
(NS).
Run
wire
through
grommet
P
and
connect
to
the
center
terminal
of
the
RF
OUT
connection
(S).
See
Pictorial
4.
)
Connect
a
wire
to
L3
(S).
Run
the
wire
through
the
grommet
A
to
the
center
terminal
of
the
(
AF
IN
connector
(S).
See
Pictorial
4.
)
Connect
either
lead
from
the
audio
choke
to
Kll
(NS).
(
)
Connect
the
outside
foil
lead
of
a
.1
gfd
condenser
to
the
solder
lug
(NS).
(
(
(
Connect
one
)
(
Connect
a
wire
from
LI
(S)
to
the
solder
lug
(NS).
(
)
See
Pictorial
3.
Connect
the
remaining
lead
from
the
audio
choke
to
K3
(NS).
)
(
(
)
)
Connect
the
outside
foil
lead
of
this
condenser
to
the
solder
lug
(S).
(
(
)
Connect
the
other
lead
to
TB3
(S).
()
(
Figure
9
(
Install
the
1 AU7
tube
in
the
9-pin
socket
on
the
sub-chassis.
(
)
I
Figure
10
Install
the
6C4
tube
in
the
7-pin
socket
on
the
chassis.
()
Assemble
the
handle
to
the
cabinet
using
two
10x 4
screws.
(
)
Install
the
rubber
feet
on
the
cabinet
as
shown
in
Figure
10.
(
)
(
)
()
This
completes
the
assembly
and
wiring
of
your
Heathkit
model
SG-8
Signal
Generator.
!
Page
14
=
Slide
the
chassis
into
the
cabinet
with
the
line
cord
through
the
hole
in
the
back
of
the
cabinet.
Fasten
the
unit
to
the
cabinet
with
two
#6
sheet
metal
screws
through
the
back
of
the
cabinet.
Cut
the
lead
opposite
the
outside
foil
end
of
a
.0
gfd
condenser
to
3/4
”
in
length.
Connect
this
lead
to
K3
(S).
Connect
a
wire
to
L
(S).
Run
the
wire
through
the
grommet
A
to
the
center
terminal
of
the
AF
OUT
connector
(S).
INSTALL
FEET
AS
SHOWN
)
Mount
pointer
knobs
on
the
five
controls
at
the
bottom
of
the
panel.
If
the
pointers
do
not
line
up
properly
with
the
markings
on
the
panel,
remove
the
knob,
loosen
the
con
trol
nut
and
turn
the
control
slightly
until
they
do
line
up.
)
Connect
the
other
lead
of
this
condenser
to
Kll
(S).
Position
condenser
as
shown
in
Picto
rial
3.
)
Slip
a
3/4
”
length
of
sleeving
over
each
lead
of
a
.01
gfd
ceramic
condenser,
lead
of
the
condenser
to
KI
(S).
Connect
the
other
lead
to
L
(NS).
)
See
Figure
9
for
details
of
mounting
the
tun
ing
controls.
The
pointer
should
be
adjusted
to
cover
the
entire
scale
when
the
condenser
is
rotated.
Insert
the
line
cord
through
the
grommet
F
in
the
rear
of
the
chassis.
Tie
a
knot
in
the
cord
about
1
1/
”
from
the
end.
Connect
one
lead
to
TB
(S).
TEST
LEAD
ASSEMBLY
C
----
i
------
HWHW
Figure
11
'.I
Outer
covering
re
in
or
rd
Figure
1
f
Page
15
i
Shielded
test
Icjd
ready
for
tonncctor.
I
I
I
METHOD
OF
PREPABING
SHIELDED
L'
AD
Z
F
i
Bend
sharply
and
separate
shleldirx
with
small
screw
driver
or
knife
blade.
Pull
tn-
i
ner
wire
out
of
A
shielding.
Wi
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.
Expensive
standard
signal
generators
have
fairly
accurate
(3
to
0%)
attenuators
which
control
the
output
voltage
and
the
calibration
accuracy
is
rarely
closer
than
1%.
The
Heathkit
Signal
Generator
may
be
expected
to
fall
within
to
3%
of
the
frequency
calibration,
which
is
quite
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
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
1 .
Solder
alligator
clips
to
both
the
inner
conductor
and
the
shield
braid.
The
test
lead
is
assembled
as
shown
in
Figure
11.
One
end
of
the
shielded
cable
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.
■
»
i
Output
Indications:
With
the
new
types
of
receivers,
especially
those
using
AVC
(automatic
vol
ume
control)
a
visual
means
of
indicating
resonance
is
desirable.
If
convenient,
in
all
receiver
alignments
the
AVC
should
be
disabled
during
the
process
of
alignment,
otherwise
the
output
of
the
signal
generator
should
be
sufficiently
attenuated
to
prevent
AVC
operation
in
the
receiver
.
RF
Alignment:
Using
a
00
/i/if
condenser
between
generator
and
antenna
post,
set
receiver
and
generator
to
1400
kc.
Adjust
antenna
and
RF
trimmer
(if
used),
(frequently
located
on
the
tuning
condenser)
for
maximum
output.
Set
generator
to
600
kc
and
’’
rock
”
tuning
condenser
through
the
signal
while
adjusting
the
oscillator
padder
for
maximum
output
at
resonance.
Wherever
possible,
the
recommendations
of
the
manufacturer
of
the
radio
being
aligned
should
be
used.
When
this
information
is
not
available,
the
following
procedure
can
be
used.
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
megacycle
equals
1000
kilocycles)
and
useful
harmonics
of
the
signal
generator
may
be
used
to
over
00
megacycles.
Oscillator
Alignment:
With
the
generator
connected
as
above,
set
the
generator
dial
to
the
high
est
frequency
marked
on
the
receiver
dial.
(1600
or
17 0
kc.)
Set
the
receiver
dial
to
this
same
frequency.
Adjust
the
receiver
oscillator
trimmer
to
bring
in
the
signal.
An
additional
adjust
ment
is
often
provided
in
the
form
of
a
padding
condenser
or
iron
core.
This
is
generally
ad
justed
at
600
kc
and
its
final
adjustment
is
made
later.
IF
Alignment:
Connect
the
signal
generator
shield
to
chassis
(ground
clip).
Clip
the
hot
lead
from
the
signal
generator
to
the
control
grid
terminal
on
the
converter
or
mixer
tube
socket
.
Set
the
signal
generator
to
the
IF
frequency
required.
RMA
standard
is
455
kc
but
other
fre
quencies
like
6
and
175
kc
are
sometimes
used.
Adjust
the
generator
output
for
a
minimum
readable
output
indication.
Adjust
IF
transformers
starting
with
the
one
nearest
the
second
de
tector
and
working
forward.
The
adjustment
mechanism
consists
generally
of
two
screws
which
operate
trimmer
condensers
or
iron
cores
inside
the
coils.
They
may
be
located
on
top,
on
the
side,
or
on
the
top
and
bottom
of
the
IF
transformer.
Turn
the
adjusting
screw
for
maximum
output,
reducing
the
signal
generator
output
if
necessary
to
keep
the
output
indicator
from
going
off
scale.
receiver
is
frequently
quite
critical.
For
accurate
calibration
of
homebuilt
receivers
or
equip
ment,
proceed
as
follows.
Make
a
rough
calibration
with
the
signal
generator.
Then,
with
a
receiver,
tune
in
WWV
(Bureau
of
Standards)
at
.5,
5,
or
10
me.
Set
the
signal
generator
to
a
suitable
sub-harmonic,
such
as
500
or
1000
kc,
and
adjust
the
generator
for
zero
beat.
Now
harmonics
of
the
signal
generator
occur
every
500
kc
or
1
megacycle,
and
these
harmonics
may
be
used
to
give
accurate
calibrations
at
points
500
or
1000
kc
apart,
such
as
500
kc,
3000
kc
,
3500
kc,
4000
kc,
etc.
These
known
frequency
points
can
be
marked
on
the
dial
of
the
equipment
being
calibrated.
The
object
of
the
rough
calibration
is
merely
to
furnish
a
means
of
identifying
for
example,
the
3000
kc
point
from
the
500
kc
or
3500
kc
points.
For
calibration
of
higher
frequency
equipment,
a
choice
of
higher
sub-harmonic
will
reduce
the
confusion
between
the
multitude
of
harmonics
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
accuracy
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
ceiver
dial
calibrations
is
frequently
not
of
sufficient
accuracy
to
warrant
consideration.
USE
OF
THE
RF
SIGNAL
GENERATOR
For
receivers
with
a
loop
antenna,
couple
the
signal
through
a
single
turn
loop
connected
to
the
generator
output.
Tuned
radio
frequency
receivers
are
aligned
as
shown
under
"RF
Alignment.
”
The
AF
output
source
can
be
used
to
test
audio
amplifiers.
To
make
such
tests,
connect
the
test
lead
tothe
AF
OUT
jack
and
throw
the
modulation
switch
to
INT
position.
Connect
the
alli
gatorclip
on
the
ground
lead
from
the
generator
to
the
chassis
of
the
amplifier
under
test.
The
Page
16
1.
2.
3.
4.
5.
VOLTAGE
CHART
Pin
6
Pin
5
Pin
7
Pin
8
Pin
4
Pin
9
TUBE
Pin
1
Pin
Pin
3
•
0
65
-6.5
6.3
AC
6C4
65
NC
1
6.3
AC
6.3
AC
85
0
.5
0
1 AU7
65
-2
I
Page
17
i
:
I
i
♦Dependent
upon
band.
NC
-
No
connection.
alligator
clip
on
the
hot
lead
from
the
generator
is
then
touched
to
the
grid
(through
a
.05
gfd
condenser)
of
the
audio
stage
under
test.
This
should
produce
an
audible
output
of
approximately
400
cycles
if
the
stage
is
operating
correctly
and
is
connected
to
a
good
speaker.
I
■I
II
!
■■
f
i
*-3
to-30i
Output
Voltage:
The
RF
signal
strength
going
into
the
output
control
depends
upon
the
strength
of
oscillation
of
the
1 AU7
oscillator.
In
all
variable
frequency
oscillators
the
amplitude
will
vary
with
the
tuning
condenser
setting.
With
careful
design
the
variation
may
be
minimized
.
In
the
Heathkit
Signal
Generator,
the
variation
is
kept
down
to
a
ratio
of
about
1/
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.
However,
even
on
this
band,
the
output
of
the
SG-8
is
in
excess
of
100,000
mi
crovolts
which
is
more
than
sufficient
for
the
average
application
in
which
this
generator
will
be
used.
IN
CASE
OF
DIFFICULTY
Recheck
the
entire
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
occurring
on
some
of
the
bare
wire
connections
from
the
coils.
These
wires
should
be
carefully
spaced
away
from
the
chassis
when
the
instrument
is
assembled.
Check
the
test
lead
with
an
ohmmeter
to
be
sure
there
are
no
shorts
between
the
inner
and
outer
conductor
caused
by
overheating
during
the
soldering
process.
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.
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
.
If
only
one
band
on
the
signal
generator
is
inoperative,
it
is
very
likely
that
tne
coil
associ
ated
with
that
band
has
become
damaged.
An
ohmmeter
connected
between
the
terminals
of
the
coil
should
show
continuity.
If
it
does
not,
one
section
of
the
winding
is
open.
A.
Page
18
B.
C.
D.
Thoroughly
identify
the
part
in
question
by
using
the
part
number
and
description
found
in
the
manual
parts
list.
Identify
the
type
and
model
number
of
kit
in
which
it
is
used.
Mention
the
order
number
and
date
of
purchase.
Describe
the
nature
of
defect
or
reason
for
requesting
replacement.
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:
The
Heath
Company
is
willing
to
offer
its
full
cooperation
to
assist
you
in
obtaining
the
proper
operation
of
your
instrument
and
therefore
this
factory
repair
service
is
available
for
a
period
of
one
year
from
the
date
of
purchase.
SHIPPING
INSTRUCTIONS
Before
returning
a
unit
for
service,
be
sure
that
all
parts
are
securely
mounted.
Attach
a
tag
to
the
instrument
giving
name,
address
and
trouble
experienced.
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
previously
sold.
WARRANTY
The
Heath
Company
limits
its
warranty
of
paits
supplied
with
any
kit
(except
tubes,
meters
and
rectifiers,
where
the
original
manufacturer
’
s
guarantee
only
applies)
to
a
period
of
three
(3)
months
from
the
date
of
purchase.
Replacement
will
be
made
only
when
said
part
is
returned
postpaid,
with
prior
permission
and
in
the
judgment
of
the
Heath
Company
was
defective
at
the
time
of
sale.
This
warranty
does
notextend
to
any
Heathkits
which
have
been
subjected
to
mis
use,
neglect,
accident
and
improper
installation
or
applications.
Material
supplied
with
a
kit
shall
not
be
considered
as
defective,
even
though
not
in
exact
accordance
with
specifications,
if
it
substantially
fulfills
performance
requirements.
This
warranty
is
not
transferable
and
ap
plies
only
to
the
original
purchaser.
This
warranty
is
in
lieu
of
all
other
warranties
and
the
Heath
Company
neither
assumes
nor
authorizes
.any
other
person
to
assume
for
them
any
other
liability
in
connection
with
the
sale
of
Heathkits.
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
question
as
this
will
void
the
guarantee.
If
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
for
a
service
charge
of
$3.00
plus
the
cost
of
any
addi
tional
material
that
may
be
required.
THIS
SERVICE
POLICY
APPLIES
ONLY
TO
COM
PLETED
INSTRUMENTS
CONSTRUCTED
IN
ACCORDANCE
WITH
THE
INSTRUCTIONS
AS
STATED
IN
THE
MANUAL.
Instruments
that
are
not
entirely
completed
or
instruments
that
are
modified
in
design
will
not
be
accepted
for
repair.
Instruments
showing
evidence
of
acid
core
solder
or
paste
fluxes
will
be
returned
not
repaired.
Other manuals for Heathkit SG-8
2
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Other Heathkit Portable Generator manuals
