Heathkit SB-1000 - Page 42

Page 44
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Connect
the
2”
medium
black
stranded
wire
from
tube
socket
V1
lug
1
(S-1)
to
terminal
strip
BF
lug
3
(NS).
Connect
the
4-1/4"
medium
black
stranded
wire
from
tube
socket
V1
lug
5
(S-1)
to
terminal
strip
BF
lug
1
(NS).
Cut
three
1-1/4”
lengths
of
large
bare
wire.
Use
these
wires
in
the
next
three
steps.
Connect
a
1-1/4"
large
bare
wire
from
tube
socket
V1
lug
4
(S-1)
to
solder
lug
BG
(S-1).
Connect
a
1-1/4"
large
bare
wire
from
tube
socket
V1
lug
3
(S-1)
to
solder
lug
BH
(S-1).
Connect
a
1-1/4"
large
bare
wire
from
tube
socket
V1
lug
2
(S-1)
to
solder
lug
BJ
(S-1).
U7
RFC2;
Use
the
following
procedure
to
install
the filament choke:
1.
Cut
all
four
leads
of
the
choke
to
1/2".
Scrape
any
excess
enamel
from
these
leads
that
may
prevent
you
from
making
a
good
solder
connection.
NOTE:
It
may
be
necessary
to
remove
some
of
the
insulation
from
these
leads.
2.
Form
the
leads
to
fit
into
the
holes
in
terminal
strip
BE
lugs
1
and
3
and
terminal
strip
BF
lugs
1
and
3.
You
will
have
to
flatten
the
leads
so
they
can
pass
through
the
holes.
3.
Install
the
choke
in
the
terminal
strip
lugs
as
shown.
Then
solder
the
leads
to
the
lugs.
Also
be
sure
to
solder
the
medium
black
stranded
wire
that
was
previously
connected
to
cach
lug.
Cut
off
any
excess
lead
lengths.
Refer
to
Pictorial
6-10
while
you
perform
the
follow-
ing
steps.
4
i
Position
the
main
chassis
as
shown
in
the
Pictor-
ial.
Set
the
center
panel
onto
the
main
chassis
as
shown.
Make
sure
the
two
black
stranded
wires
coming
from
terminal
strip
BE
pass
through
the
indicated
slot
in
the
center
panel.
Then
use
three
632
x
1/4"
screws
and
three
#6
oO
Heathkit
lockwashers
to
secure
the
center
panel
to
the
main
chassis
at
CF,
CG,
and
CH.
Refer
to
Detail
6-10A
and
use
the
following
procedure
to
mount
the
front
subpanel
to
the
main
chassis
and
center
panel:
1,/ Remove and discard the plastic setscrew
retainers
from
the
bushings
of
the
vernier
drives.
Set the
front
subpanel
onto
the
main
chas-
sis
as
shown.
Make
sure
no
wires
are
pinched
between
the
subpanel
and
the
chassis
or
center
panel.
Also
make
sure
the
shafts
of
variable
capacitors
C27
and
C31
enter
their
corresponding
holes
in
the
vernier
drives.
Use
three
6-32
x
1/4"
screws
and
#6
lock-
washers
to
mount
the
front
subpane!
to
the
center
panel
at
SQ,
SR,
and
$s.
Use
two
6-32
x
1/4”
screws
and
two
#6
lock-
washers
to
mount
the
front
subpanel
to
the
main
chassis
at
ST
and
SV
and
a
6-32
x
3/8"
screw
and
a
#6
lockwasher
at
SU.
Turn
the
shafts
of
the
two
vernier
drives
so
the
dial
pointer
mounting
screws
are
parallel
to
the
bottom
edge
of
the
front
subpanel
(refer
to
inset
drawing
#1
on
the
Pictorial).
Also
make
sure
at
least
one
of
the
setscrews
in
the
bushing
of
each
vernier
drive
is
accessible.
Make
sure
the
plates
of
variable
capaci-
tors
C27
and C31
are
fully
meshed
(closed).
7/
Push
variable
capacitors
C27
and
C31
i
toward
the
front
subpanel
until their
shafts
are
just
past
the
vernier
drive
set-
screws.
Then
tighten
the
setscrews
against
the
shafts.
Tighten
the
vernier
drive
mounting
hard-
ware.
Make
sure
the
solder
lug
on
the
top
vernier
drive
is
toward
the
top
of
the
front
subpane).
Then
tighten
the
hard-
ware
that
secures
variable
capacitors
C27
and C31
to
the
center
panel.
Make
sure
terminal
strip
CB
is
parallel
to
the
top
of
the
center
panel
as
shown
in
inset
drawing
#2
on
the
Pictorial
when
you
tighten
its
hardware.