Heathkit SB-10 - Page 46

'(.
(:
Refer to
Figure 14
on
page
45
for the
following
steps:
{ )
Mount the
panel
and assembly
to
the
chassis.
Carefully
start the
protruding
control
shalts
through
the
panel
bushings.
Continue
sliding the
panel
down until
the audio
deck
is tight
against
the
panel.
Secure
the
deck
to
the
front
apron
with
two
#6 sheet
metal
screws,
&s
shown.
place
the
unit
so
it
rests
on the
panel
face.
Place a
rag
under the
panel
for
protection.
Proceed with
wiring
of the
controls.
Separate the
two
short
shielded
leads
from
the long
one
in the
shielded
wire
harness.
Connect
the
center
conductor
of
the
shielded
lead which
is coded
RED
to audio
gain control
terminal
#2
(S1).
Connect
the
center
conductor
of
the
second
shorter
shielded
lead to
audio
gain
control
ter-
minal
#3
(S
1
).
Dress
the
long
shielded
lead
as
shown
and
connect
the
center
conductor
to
the
eenter
of
the
microhpone
connector
(s1).
Connect
the
shield
pig-tait
to
the
ground
lug at
the
microphohe
connector
(S1).
Bend
the
control
ground
lug
of
the
audio
gain
control so
that
it
is touching
terminal
#1.
Connect
the
shiefO
pig-taiis
Iro*
the
shielded
wires
at
terminals
2 and 3
to
terminal
1 and
)
)
)
)
)
)
(
(,i
('.
(r
(')
solder
entire
connection
(S3).
connect
the other
wires
from
the
function
harness
to the
function
switch
as
follows:
(t')'White
to terminal
#1
(s1)
of
the
function
switch'
(
..
)
Rea
to terminal
#4
(Sl)
of the
function
switch'
1,,;
At"e to terminal
#6
(NS)
of
the
function
switch'
iYi
C"r"""t
a
I t/4,'
Iength of.#20
bare
wire
from
terminal
#6
(S2)
to
#5
(S1)
of
the function
.,
switch.
(.')
Bend
and connect
the
ground lug
to
terminal
#3
(S1)
of the
function
switch.
(
0''InstaU
the two
rein.forcing
angle
brackets
alongthe-
bottom
corners
of the
sub-chassis
pieces
and the
front and
rear
"p?o.t"i.
U""
#6
sheet
metal
screws,
Notice
the
brackets
are
inter-
changeable;
either
will
iit at
each
location.
Before
securing,
make
sure
the
sub-chassis
pieces,therearapronandthefrontpanelareallpelpendiculartotheaudiodeck'Seethe
under
chassis
photograph
at the
rear
of the
manual'
(,/)
Install the
6 11/16"
shaJt
extension
through
the
OUTPUT
bushing
and
secure
to
the
output
"
v
'
;;;iG
""p*ii"r-*itrr
an
insutated
coupling.
Leave 3/8"
of the
sha-ft extending
from
the
iront"panet
bushing.
Use
#8-32
x
l/8"
slotted
set
screws
on
the coupling'
(
)
'place
the chassis
in
its
normal
upright
position
and connect
the
shielded
wire
which
is
pro-
'
'
t"oaittg
through Gl
(Audio
Deck)
to AA1
on
the
panel
(S3)'
See
Figure
15'
PIaCe
the
tubes
in their
respective
sockets
as-follows:
i-)
1*o IZAT?
tubes
in the
sockets
on the
balanced
modulator
sub-chassis.
Place
one
of the
smaller tube
shields
over
each
tube.
(
".)
A 6CL6
in the
socket
on
the
RF
deck
directly
above
the
driver
coils.
Place
the
larger
tube
shield
over the tube.
(
)
An ELg4/6Be5
inthe
socket
on
the RF
deck
above
the
final tuning
capacitor.
No
tube shield
is
used.
See
Figure l5
for the
following
tube
placements:
(t)
I tZexz
in the
socket
to the
rear
of
T1,
using a
small
tube
shield'
Page
46