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RCA BA-13A - Installation

RCA BA-13A
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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.
If
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.
If
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
(MI-
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.
Install
the
receptacle
cover
or
shield,
according
to
instructions
for
the
Type
BR-2A
Panel
and
Shelf,
contained
in
IB-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.
Install
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
MI-11233
and
MI-
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
(MI-1
1598,
-A
and
MI-
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
(GAIN
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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