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6
WIRING INSTRUCTIONS
Refer to pictorial diagram #2 before and after each
step. After making a connection, bend (dress) each
lead or wire so that it follows the path shown in the
diagram as closely as possible. After all connections
have been made to a terminal and it is soldered
cut off any excess wire.
1( ) Begin with the group of five leads from the power
transformer PA-774, all of which come through the
hole in the chassis opposite of fuse holder.
NOTE: Special instructions for wiring PB-028 the 240-volt power
transformer, are at the end of these instructions.
When cutting transformer leads to correct length
strip the insulation at the end of each lead to expose
about
¼" of wire. Tin the exposed end, by heating
it with the soldering iron and melting a bit of solder
onto it; this will keep the end from fraying, and
permits a more secure mechanical connection. Meas-
ure the length with a ruler, from the chassis to the
end of the lead, wile holding the lead straight out
from and perpendicular to the chassis. Cut one of
the black leads to 1
½" in length, and connect it to
lug #4 of the 5-lug terminal strip. Do not solder,
remember, a connection is only to be soldered when
the symbol (S) is printed after the instruction.
2( ) Cut the other black lead to 3½", and connect it
to terminal B of the fuse holder (S).
3( ) Twist together the two red power transformer leads.
Connect one of them to lug #1 of the 5-lug terminal
strip.
4( ) Connect the other red power transformer lead to lug
#2 of the 5-lug terminal strip.
5( ) Cut the red-and-yellow power transformer lead to
3½" in length, and connect it to chassis-mounting
lug A of the filter capacitor.
6( ) The four remaining power transformer leads are con-
nected next. Cut the green and green-and-white
leads to 6" each, and twist them together, as shown
in the diagram. Connect the green-and-white lead to
pin #5 of V-3 on the LEFT circuit board.
7( ) Connect the green power transformer lead to pin #4
of V-3. IMPORTANT: Because the tube sockets lugs
are small and closely spaced, it is imperative that
all connections to them be made with care. Keep
stripped wire ends as short as possible; insert them
in the lugs up to insulation; cut off excess imme-
diately after soldering each connection; check each
time to be certain that nearby terminals and hard-
ware cannot accidentally be touched by bare wire
ends.
8( ) Cut the brown and the brown-and-white power
transformer leads to 6". Twist them together, and
connect the brown-and-white lead to pin #5 of V-6
on the RIGHT circuit board.
9( ) Connect the brown power transformer lead to pin
#4 of V-6.
10( ) The LEFT output transformer leads are connected
next. Carefully cut the blue-and-white and green-
and-white leads from the LEFT output transformer
to exactly 2" in length. Strip and tin the ends, and
twist the leads together, as in the diagram. Connect
the blue-and-white lead to pin #7 of V-2 on the
LEFT circuit board (S).
11( ) Connect the green-and-white lead to pin #9 of V-2
(S).
12( ) Twist together the blue and green leads from the
LEFT output transformer. Connect the blue lead to
pin #7 of V-3 on the LEFT circuit board (S).
13( ) Connect the green lead to pin #9 of V-3.
14( ) Connect the red lead from the LEFT output trans-
former to lug #2 of the filter capacitor. This is the
lug next to square symbol on the plastic under-
side of the capacitor, and should be in the position
shown in the pictorial diagram.