Heathkit SB-1000 - Page 45

Heathkit
yg Cut the following lengths of large bare wire. Use
these wires in the next three steps.
4-1/2"
4-3/4”
3-1/2"
NOTE: When you connect the large bare wires in the
following steps, be careful not to exert any excess
pressure on the switch lugs. Uselong-nose pliers to hold
each wire near the switch lugs while you route it.
A Flatten one end of a 4-1/2" large bare wire. Then
connect this end of the wire to switch SW2E lugs
10. Solder the wire to both lugs. Route the free end
of the wire as shown and solder it to tap #1 on coil
L7.
nA Flatten one end of a 4-3/4" large bare wire. Then
connect this end of the wire to switch SW2E lugs9.
Solder the wire to both lugs. Route the free end of
the wire as shown and solder it to tap #2 on coil L7.
wy Flatten one end of a 3-1/2" large bare wire. Then
connect this end of the wire to switch SW2E lugs 8.
Solder the wire to both lugs. Route the free end of
the wire as shown and solder it to tap #3 on coil L7.
~ Ww Refer to the inset drawing on the Pictorial and use
a screwdriver blade to carefully bend the close-
spaced turns of the coil, as necessary, so they do
not touch.
Yo V1: Unpack the 3-500Z tube. Then match the pins
on the bottom of the tube with the holes in its
socket and push the tube as far as possible into the
socket. CAUTION: Use extreme care when you
handle this tube. Gently push the tube into the
socket without rocking it. Too much pressure or
lateral force (from rocking) may crack the glass
beads around the socket pins, and damage the
tube. The Heath Company cannot be held
responsible for any damage sustained through
improper installation.
NOTE: Be careful not to bump or damage the tube while
you complete the remainder of the assembly.
A ¥ Refer to Detail 6-13C and usea 6-32 x1/4" screw to
loosely mount a #6 solder lug onto the top of the
plate connector as shown.
Page 47
Y Refer again to Detail 6-13C and start a 6-32 x 1/4"
screw in the side of the plate connector. Then push
the connector onto the plate cap of tube V1. Now
tighten the side screw.
/ Position the solder lug on top of the plate
connector toward plate choke RFC3. Then tighten
its screw.
iL Y Cut a 5-1/2" length of large bare wire. Then refer
to Detail 6-13D Part A and wrap 3-1/2 turns
around the larger portion of the nut starter as
shown. Make sure the turns are equally spaced
over a length of 7/8". Flex the coiland twist the nut
starter to remove it.
ee Refer to Detail 6-13D Part B and solder the
prepared coil to the leads of a 100 Q, 2-watt (brn-
blk-brn) resistor.
¢ PC1: Connect the prepared resistor/wire com-
bination from plate choke RFC3 lug 1 (S-3) to the
solder lug on the plate connector of tube V1 (S-1),
Position the choke midway between the plate
choke lug and the plate connector. Cut off any
excess lead lengths.
Refer to Pictorial 6-14 while you perform the following
steps.
4 Reposition the main chassis as shown in the
Pictorial.
w Refer to Detail 6-14A and use six 6-32x 1/4" screws
and six #6 lockwashers to mount the rear panel
assembly onto the main chassis as shown. Be
careful not to pinch any wires or other parts
between the rear panel and the main chassis or the
center panel. Also make sure the long black and
violet wires coming from the rear panel are on the
side of the center panel where the fan is mounted.
YY Route the Jong medium black stranded wires
under the fan, along the bottom edge of the center
panel, and out through the indicated opening in
the front subpanel. The ends of these wires will be
connected later.
Refer to inset drawing #2 on the Pictorial and route the
long medium violet stranded wires over the top of the
fan and connect them to the fan lugsas follows. You will
have to wrap the wires around the lugs. NOTE: The lugs
on your fan may be in a different location from that
shownin the Pictorial. Shorten these wires as necessary.