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Heathkit SB-220 - Alcwiring

Heathkit SB-220
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Page 27
PICTORIAL
4-2
ALC
WIRING
Refer to Pictorial 42 for the following steps.
(((Refer
m
Detail 42A and mount a 6-lug terminal strip
on the taof the chassis at holes BE and BF with 6-32
x 114" hardware. Use
a
#6 solder lug at BFonly.
I
Refer to
Part
A of the Pictorial for the next five steps. Note
the positions of the components.
(6
Connect a 47 kS2 (yellow-violetaange) resistor from
I
lug 2 (NS) to lug 4 (NS) of terminal strip BE.
(0
Connect a 2200
C!
(red-red-red) resistor from lug 1
1
(NS) to lug 3 (NS) of terminal strip BE.
I/
'
(
1
Connect a .02 pF disc capacitor from lug 4 of terminal
1
strip BE (Ns) to soua lug BF (Ns).
14
Connect a 500 volt (smaller) -001 pF disc capacitor
from lug 5 of terminal strip BE (NS) to solder lug
BF
(NS).
6-32
x
114"
SCREW
Detail
4-2A
(
r/f/
Connect a .02 pF disc capacitor from lug 6 of terminal
strip BE (NS) to solder lug BF (S-3).
Refer to Part B of the Pictorial for the next eight steps.
(
J(
Prepare a 10" length of orange hookup wire and a 17"
length of yellow hookup wire.
(dConnect one end of the orange wire to lug 6 of
terminal strip BE (NS).
(4
Connect one end of the yellow wire to lug 2 of
terminal strip BE (S-2).
((1
Pass the free ends of the yellow and the orange wires
down through grommet T. To temporarily secure the
ends of these wires, they can
be
passed up through
some other hole in the chassis.
(
4
Connect a 2200
C!
(red-red-red) resistor from lug 3
(NS) to lug 5 (S-2) of terminal strip BE.
(4
Connect a 27 kS2 (red-violet-orange) resistor from lug
3
(NS)
to lug 6 6-3) of terminal strip BE.
!,'?st
C+X.
-
I?
179
(
f)
Connect the cathode lead of a silicon diode (#56-24,
yellow-green-gray) to lug 3 (NS), and the anode lead
to lug 4 (S-3) of terminal strip BE.
(dl
Connect a 10
pF
(may be marked I0 wF) tubular
ceramic capacitor from lug
3
(S-5) to lug 1 (NS) of
terminal strip BE.

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