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3
INSTALLATION
INPUT RECEPTACLE J-1
Terminal No.
Connection
Receptacle Connections
The connections to the two 10-prong receptacles
which mate with the amplifier plugs are shown in
the following tabulations:
No connection
No connection
Bridging input
Bridging input
Output of bridging pad
Test meter (4- )
Output of bridging pad
Amplifier ground
Matching input
Matching input
3
4
5
6
7
8
9
10
11
12
Power Transformer Connections
The power transformer T-3 is connected for
operation from all 5-volt a-c power line. f the line
voltage is normally 120-130 volts, disconnect the
red-and-black wire from terminal number 11 on
T-3 and connect it to terminal number 12. f the
line voltage is normally 100-110 volts, disconnect
this same red-and-black wire and connect it to
terminal number 10 on T-3. Refer to figures 2
and 8.
with the shelf assembly (M - 11599, -A) by means
of four of the No. 6-32 fillister-head machine screws
furnished with the shelf. Mount the receptacles and
brackets in the correct spaces on the shelf with six
of the No. 8-32 round-head machine screws and
lockwashers supplied with the shelf.
nstall the
receptacle cover or shield, according to instructions
for the Type BR-2A Panel and Shelf, contained in
B-24411 after the receptacles have been wired
according to the following information:
Attach one of the guide bars, furnished with the
shelf, to the shelf on each side of the space which
is to be occupied by the amplifier. Use two No. 4
self-tapping screws also supplied with the shelf,
to mount each guide bar. Holes are provided in the
guide bars and in the shelf for this purpose. The
square ends of the bars should be towards the front.
Slide the amplifier chassis onto the shelf so that
the plugs fit into the receptacles and the hooks of
the ejector handles fit into the square holes in the
shelf. Push back on the ejector handles to obtain
good contact in the receptacles. nstall the panel by
slipping it over the control shafts of the amplifier
and attaching it to the shelf, by engaging the panel
latches on the rear at each side of the panel.
Adjust the spring catches on the top section of the
panel, for minimum and equal snap action. This
adjustment may be made by loosening the No. 6-32
hex nuts holding the catches and moving the
catches up or down. Close the top section of the
panel and place the knobs on the control shafts.
Should it become necessary at any time to remove
the amplifier for servicing, first remove the knobs
and panel. Then, pull forward on the handles and
slide the amplifier out.
Electrolytic Capacitors
Plug the four electrolytic capacitors into the red
sockets provided for them on the amplifier chassis.
Carefully check each capacitor as it is installed to
ascertain that the ratings marked on the capacitor
cover correspond to the values stenciled on the
chassis, adjacent to the sockets.
Tubes
With the power switch in the OFF position,
install the tubes in the correct sockets. The tube
type for each socket is stenciled on the chassis
near the socket. Mount the two grid caps and two
grid-cap shields on the 1620 tubes. Each shield
must make a good electrical connection to the shell
of the tube to insure noise-free operation.
is mounted on the left side of the amplifier front
panel and the meter switch on the right, see figure 1.
The hum-adjustment potentiometer is mounted on
top of the chassis, in front of the output trans
former, see figure 3. The M -11233 and M -
1 1233-A units are similar, except that the former
uses a dual step-type attenuator gain control, and
the latter uses a dual continuous-type attenuator.
Mounting
The Type BA- 13 A Program Amplifier is designed
for mounting on a Type BR-2A (M -1 1598, -A and
M - 11 599, -A) Panel and Shelf.
The gain-control shaft is on the left side of the
amplifier (front view) and the meter-switch shaft
is on the right side. Mount the dial plates furnished
with the amplifier on the panel, in positions cor
responding to the respective shaft positions (GA N
dial to the left of the METER dial), securing them in
place with the bushings, washers and nuts also
supplied. Assemble the parts with the heads of the
bushings on the inside of the panel to insure
clearance.
Assemble the receptacles furnished with the
amplifier to two of the U-shaped brackets supplied
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