Heathkit SB-401 Assembly Manual page 50

( ) Connect a .005 Ilfd 500 V disc capacitor
between lugs 4 (NS) and 10 (NS) of tube
socket
VI0.
( ) Connect a .005 Ilfd 500 V disc capacitor
between lugs 3 (NS) and 10 (NS) of tube
socket VlO. It may be necessary to bend
lug 10 of V10 to miss lug 1 of terminal
strip P.
NOTE: When making connection to the center
post of tube socket V9, position the leads straight
down into the center post. This will make it
easier to install the tube bottom shield later.
All leads and wires around the tube sockets
V9, VIO,. and V11, and around all coils, should
be as short as possible.
( ) Connect a .005 fJ.fd 500 V disc capacitor
between lug
S
(S-1) and the center post (NS)
of tube socket V9.
( ) Connect a .01 ufd capacitor from lug 9 of
tube socket V10 (8-4) to lug 3 of terminal
strip P (NS).
( ) Cut one lead of an RF parasitic choke
(#45-43) to 1/4" and connect this lead to
lug 2 of tube socket V9 (8-1). The other lead
will be connected later.
( ) Connect a 10
n
{brown-black-black} r e-
sistor between lugs 1 (NS) and 9 (NS) of
tube socket
VlO.
( ) Cut one lead of a .005 J..Lfd 5 00 V disc capac-
itor to 1/4" and connect this lead to lug 1 of
tube socket V9 (8-2). The other lead will be
connected later.
( ) Pass one lead of a .005 /lfd 500 V disc
capacitor through lug 9 (NS) to lug 2 (8-1)
of tube socket V10. Connect the other lead
to lug 1 of tube socket VlO (N8).
•
( ) Cut one lead of a 150
n
(brown-green-brown)
resistor to 1/4" and connect this lead to
lug 1 of tube socket V9 (NS). The other lead
will be connected later.
( ) Connect a .005 ufd 500 V disc capacitor
between lugs 3 (S-2) and 4 (NS) of terminal
strip R. .
( ) :Bend the remaining lugs of tube socket V9
outward· as shown.
( ) Bend lugs 4 and 7 of tube socket V9 against
the center post of the socket (N8).
( ) Connect a 3300
n
(orange-orange-red)
.1.
watt resistor from lug
8
of tube socket V9
(8-2) to lug 1 of terminal strip R (NS).
( ) Bend lug 7 of tube socket V7 against the
solder lug mounted at the tube socket (NS).
( ) Pass a 3-3/4" bare wire through lug 1 of
crystal sockets Yl (S-1), Y2 (8-2), Y3 (8-2),
Y4 (8-2), Y5 (8-3), Y6 (8-2), Y7 (8-2),
to Y8 (8-1).
( ) Connect a .01 fJ.fd disc capacitor between
lugs 1
(N8)
and 3
(NS)
of terminal strip
R.
( ) Connect a 6800
n
(blue-gray-red) 1 watt
resistor from lug 6 of tube socket V9 (NS)
to lug 1 of terminal strip R (NS).
( ) Connect a .005 Ilfd 500 V disc capacitor
between lug 8 (NS) and the center post (NS)
of tube socket V9.
( ) Twist lug 1 of crystal sockets Yl through
Y8 45 degrees as shown. Use care not to
break the crystal sockets.
( ) Connect a 15
IlH
RF choke (#45-51) from
lug
5
of tube socket V9
(8-2)
to lug
5
of
terminal strip
R
(NS).
( ) At the other end of this cable, connect the
inner wire to lug 1 (NS) and the shield to
2 (8-2) of terminal strip C.
( ) Connect a .005 Ilfd 500 V disc capacitor
between lug
5 (NS)
and the center post
(NS)
of tube socket V9.
( ) At the end of the prepared coaxial cable with
the most insulation removed from the inner
wire, connect the inner wire to B (S-1) and
the shield to A (S-1) of the mixer-bandpass
circuit board.
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