Heathkit SB-401 Assembly Manual page 49

(I
Detail 4-2C
-
1/4"
a \
~~ 3/4" -
- 3 /4" _
1/2"
J
- -
( ) Connect a
.2
J.lH RF choke (#45-3B) from lug
2 of tube socket VS
(NS)
to lug 3 of terminal
strip C (N8).
( ) Connect a 2.2 pf tubular phenolic capacitor
(red-red-white) between lugs 2
(NS)
and 3
(NS)
of terminal strip C.
( ) Refer to Detail 4-2C, and prepare a 4-3/4"
length of coaxial cable as shown.
( ) Connect a .005 /-lfd500 V disc capacitor from
lug 1 of banana socket A
(NS)
to solder lug
B (8-4).
( ) Connect a .01 /lfd disc capacitor between
lugs 2 (8-3) and 3
(NS)
of terminal strip D.
( ) Connect a 305 /J.Hchoke (#45-33) from lug 3
of terminal strip D
(NS)
to lug 9 of tube
socket VB
(NS).
Usea3/4"lengthofsleeving
on the lead to the tube socket.
( ) Connect a
22
pf mica capacitor between lugs
3
(NS)
and 9
(S-2)
of tube socket VS. Use 3/S"
of sleeving on the lead to lug 3.
( ) Pass one lead of a .005
Jlfd
500 V disc capac-
itor through the center post of tube socket
VS (N8) to solder lug B
(NS).
Connect the
other lead of the capacitor to lug S of tube
socket
va
(S-2).
( ) Connect a 6800
n
(blue-gray-red) resistor
from lug 3 of terminal strip D
(NS)
to
lug S of tube socket VB (N8).
( ) Connect a 150 pf mica capacitor from lug 1
of terminal strip D (8-2) to lug 7 of tube
socket V8 (8-2).
( ) Connect a 47 KO (yellow-violet-orange)
resistor from lug 2 of terminal strip D (N8)
to lug 7 of tube socket VB (N8).
( ) Connect a 3900
n
(orange-white-red) resis-
tor from solder lug B
(NS)
to lug 2 of tube
socket VB
(NS).
( ) Bend the remaining lugs of tube socket VB
out slightly as shown.
( ) Connect a 150
n
(brown-green-brown) resis-
tor from solder lug B
(NS)
to lug 6 of tube
socket VB
(NS).
( ) Bend lugs 1 and 4 of tube socket VB against
the center post
(NS).
( ) Connect a .02 /lfd disc capacitor between
lugs 2 (N8) and 3 (8-1) of terminal strip L.
( ) Connect a 4700
n
(yellow-violet-red) resis-
tor between lugs 1
(NS)
and 2 (N8) of terminal
strip L.
( ) Connect a 2000
n
(red-black-red) resistor
from lug 2 of the crystal filter
(S-2)
to the
solder lug on the crystal filter mounting
foot (8-1).
( ) Connect a 500 Kn 1 watt precision resis-
tor from lug 1 of capacitor F
(NS)
to lug 1
of terminal strip E (8-3).
( ) Connect a 50 pf mica capacitor from lug 2
of the crystal filter (N8) to L on the mixer-
bandpass circuit board (8-1).
( ) Connect a 2-1/4" blue wire from lug 1 of
capacitor F (N8) to lug 2 of capacitor G (8-2).
Page 41