10( )Select the 3-pin XLR input socket, the two
3
/
8
" #4
screws with oval heads, and two #4
KEP
nuts. Install
the XLR input from the
outside
in the round hole at
the center back so that the pin location matches the
Pictorial Diagram. Insert the screws from the outside.
Do not use excessive force on the nuts.
Much of the hardware used to mount the parts in this kit
is #4-40 x 5/16"—the smallest size. If no mention is made of
the type of hardware, use this size. A set is one screw and
one
KEP
nut.
11 ( ) Select the dual RCA input socket strip, the matching
insulator strip, and four #4 screws and
KEP
nuts.
This input strip mounts inside next to the XLR in-
put. Insert the screws from the outside, install the
insulator first on the inside, followed by the input
strip, and fasten with the
KEP
nuts.
12 ( ) Select the four 8-pin tube sockets, and eight sets of
#4 hardware. Notice that each socket has a cutout or
key way in its inside circular opening. The sockets
mount from the inside in locations V2, V3, V4 and
V5 so that each keyway points toward the right back
of the chassis. Insert the screws from the outside.
13 ( ) Select the small 9-pin tube socket, and two sets of #4
hardware. Mount the socket from the
outside
in loca-
tion TD-1. The blank pin location points toward the
right back of the chassis. Insert the screws from the
outside.
14 ( ) Select two of the 2-lug terminal strips, and two sets
of #4 hardware. Install one of the strips in location
T-l, and the other in location T-2, positioned as
shown in the Pictorial Diagram. The screws are in-
serted from the outside.
15 ( ) Select the three 6-lug terminal strips, the last 2-lug
terminal strip, and 6 sets of #4 hardware. Install one
each of the 6-lug strips in locations T-3, T-4 and T-5,
and the 2-lug strip in location T-6, as shown in the
Pictorial Diagram. One set of hardware is used to in-
stall both T-6 and one end of T-3. Note T-4 and T-5
holes are the outermost pairs.
16 ( ) Select the three rubber grommets, and insert one each
in the holes at locations G1, G2 and G3. They are
simply squeezed and pressed in place.
17 ( ) Select the round fuse holder with attached hardware.
Install it in the left back "D" shaped hole. The rub-
ber washer stays outside the chassis.
18 ( ) Select the four circular capacitor mounting brackets
and four sets of #6 hardware. Note in the accompany-
ing sketch the direction of the clamping screw of each
bracket for easy access. Install these screws and nuts
loosely.
19 ( ) Select the remaining eight sets of #4 hardware, and
install the four capacitor brackets on the top (out-
side) of the chassis, as shown in the sketch. Do not
tighten any hardware.
20 ( ) Select the two 50 mfd (300 v.) and the two 100 mfd
capacitors. These parts look alike. Install the
50 mfd
capacitors in brackets C4 and C5, near the short outer
edge of the chassis. Before tightening the clamping
screw, position each capacitor so the ( + ) terminal is
toward the front chassis edge—as shown in the Pic-
8
torial Diagram. Now install the two 100 mfd capaci-
tors in the other brackets. Position the ( + ) terminals
toward the front, and tighten all clamps and mount-
ing hardware.
21 ( ) Select eight of the solder lugs, and the eight
3
/
8
" #10
SEMS
screws (lockwashers attached). Install the
solder lugs on each of the eight capacitor terminals.
Position the lugs as shown in the Pictorial Diagram,
and see that the screws are very tight. Bend each lug
away from the chassis to about a 45° angle.
Before installing the capacitor in the next step, carefully
remove the black paint around the small rectangular slot
"A" at location C1 in the center of the chassis. Scrape the
paint down to the bare metal with a small knife or the blade
of a screwdriver. This will be the main chassis ground for
the amplifier, so a good solder connection to the chassis is
essential.
22 ( ) Select the dual-section 50 mfd capacitor, part
#297107, and mount it from the top of the chassis at
location C1. The lug marked with a semicircle should
be located as lug #2 in the Pictorial Diagram. Insert
the mounting tabs fully through the chassis from the
outside, and twist each tab 1/4
turn to lock the
capacitor in place. Twist tightly so that the
capacitor is held firmly against the chassis and does
not move when wiggled.
Set the chassis aside for a moment. To prepare the two
large transformers for mounting, we suggest affixing a piece
of cardboard with tape to the top surface of each transformer
so that when they are inverted and mounted on the chassis,
the cardboard will protect your work surface and the trans-
former paint.
23( ) Select the
output
transformer, part #454355 (it has 9
leads connected to it), four 3/4" 1/4-20 screws (largest
hardware), four large flat washers, and four 1/4-20
KEP
nuts. Invert the transformer so that its leads
and mounting feet face up. Mount the transformer on
the
right
side of the chassis, with the black, brown,
orange and yellow leads toward the
right
(outside).
Ignore the hole centered under the transformer. In-
sert a screw through each foot from the outside, see
that no wires are trapped, slip a washer onto each
screw on the inside, and firmly fasten with
KEP
nuts.
