Heathkit SB-401 Assembly Manual page 9

FI N ISH
PICTORIAL 1-2
) Set the circuit board aside tern-
porar ily,
(
) Check all connections to see that
they are soldered. Do not cut
off the transformer, tube sock-
et, and coil pins.
(
( ) Install the IF bandpass coupler
transformer (#52-65). Solder all
7 -pins,
L E TTER.ED
SID E
trap coil
may be
direction.
) Install the 21 MH z
(#40-479). The coil
installed in either
Solder both lugs.
(
CONTINUE
..
.. ..
.
..
.
.
. . .
. .
.
·
.
·
. ·
.
.
·
.
• • •
·
.
·
.
.
• •
·
.
.
·
.
.
• •
·
.
.
-:0' ' .
"..
.."
..
.
..
.."
'..
.."
.. .
·
.
..
"
.. ..
..
.. ..
..
.
..
..
..
.. .. ..
.. ..
• .. _ .. .. .. .. .. .. • .. .. .. .. .. .. .. .. .. .. .. .. .. .. t .. .. .. .. .. .. .. .. .. .. ..
..
.
.. ..
. .
..
..
..
.. ..
..
.. .. .. .. .. ..
..
..
..
..
..
..
..
..
.. ..
.. ..
.. .. .. ..
..
..
.
..
.. ..
..
-
..
..
.. ..
..
.. .. .. .. ..
..
.. ..
.. ..
..
..
..
..
.. .. .. .. .. ..
..
..
..
..
.. ,
•• , ,t ••• ••••••
....................................
...........................
,
.
-
.. ..
. . .. .. ..
..
.. .. ..
.......................................,
..
.
.. .. .. .. ..
..
..
..
..
..
.. ..
. .
..
..
.. ..
..
.. ..
,
.. ..
. .
..
..
.. ..
PRESS
THE
SOCKET DOWN
UNTIL IT
SEATS
IN PLACE.
ALIGN ALL PINS
TO THEIR
RESPECTIVE
HOLES.
Install 7-pin tube sockets at V5
and V4. Solder all 7 -pins and
the center pin of each socket.
LETTERED
SI D E
(
)
SOLDER
( ) Solder the center pin to the
ground clip on the two 7-pin
tube sockets before the sockets
are mounted.
NOTE:
When soldering the tube
sockets
in
the following steps, the
first application of solder will tend
to run into the pin. After applying
one layer of solder, allow it to cool;
then
apply a second layer using only
enough heat to permit the solder to
flow.
START
Page 7