RCA BA-36A User manual
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3
TECHNICAL DATA
*Input Impedance
47,000
ohms
shunm.l
by
approx.
100 pf.
(for
Ml-11865 car1ridge, ,1ercophonic
conneciion)
Up
10
G0
,000
ohms
available
b)'
chang
i
ng
shunt
resis1or.
*Output Impedance
150/GOO
ohms
(600
ohms
as
,hipped)
*load
Impe
dance
150/GOO
ohms
*Sensitivity
at
1000
cps
3.?
cm/sec
(45
°)
for
-20
dbm
ou1pu1 level
5.
5
cm/sec
(la1eral)
for
-20
dbm
ou1pu1 level
(wi1h
any
magne1ic
cariridge
and
GA
I
N,
LEFT
and
RIGHT
adjusted
per
instructions)
*Input
Voltage
for
-
20
dbm
Output
l e
vel
(1000
cps)
.0016 v
Ill
.0
U v
(approx.)
.OO
•l volls
(as
shipped)
*Output Level
Pro,::ram:
-20
VU
(avcra1,1c
record)
Maximum:
-5
dbm
Transistors
and
Rectifier
2
2N220
f,
2N404
2 1N3193
O
ver
all
Dim
ensions
and
W
ei
ght
Len~1h:
Wid1h:
Dep1h:
Weigh1:
I0-1/,t
inches
61/s inches
21
/z
inches
5 pounds, 4 ounces
0 Applirnble for each
,hanncl.
*High Frequency Compens
ation
(Se,: figure
3)
0,
-.\.
5.
or
-
LU
db
.11
I
0.001)
cps
by
means
of
1be
EQUALIZER
s
wit
ch
*Dis
tortion
Al
-20
dbm
0111p11t Level:
ln1ermodula1ion:
tcss
1han I
o/c
(40/4000
cps
or
400/4000
cps
-f:
I)
Ha
rmonic:
less
than
0.25%
At
-5
dbm
011tp111
Len/:
ln1ermodula1io11: Less 1han
4%
Harmonic:
Less 1han I%
*Frequency R
es
ponse
(Su
figure
2)
NJ\8/RIAA:
Meer,
NAB
spc<ifica1ion,
Fla1: ±
o.s
db
20
to
20,000
cps
*
Hum
and
Noise Level
-78
dbm
maximum
(30
to
15,000
cps)
5 microvolts
(equivalent
1000 cps
signal
at
inpu1)
(600
ohm
input
tcrmina1ion
NAB/RIAA
strapping,
GAIN,
LEFT,
and
HIGHT,
as
shipped)
Crosstalk
Betw
ee
n Channels
B
elow
Noise
Level,
30
w 15,000
cps
Fuse
1/16
amp
3AG
Power
Requirements
117V
AC
50/60
cycles; taps 105, 115
and
125V
230V
AC
50/60
cycles; taps 210, 230
and
25UV
I
watt
Acce
s
sori
es
Transistor
and
Diode
Kir Ml-1178.\
DESCRIPTION
The
Type
BA-36A
Stereophonic
Preamplifier
Equalizer M1-11
441-A
is
designed
primarily
co
pro-
,
ide
equalization
of
the
recre:ued
audio
frequencies
of
stereophonic
records
and
transcriptions
before
introduc1ion
int
o the
audio
system
of
broadcast
and
cclcvision staciorn..
The
BA-36A
is
designed
for
both
stereophonic
and
monophonic
recordings.
The
unic
may
be
mounted
inside
the
cabinet
of
0Q5
l
turn-
cables
and
may
be
used
with
any
professional
quality
magnetic
cartridge
and
cone
arm.
As
shown in figure 1, the equalizer has a terminal
board
for
making
input
and
output
connections. A
six-foot
AC
cord with plug is attached to
the
unit.
The
fuse h
ol
der
for
Fl
is mounted besi
de
it.
Two
openings are provided on
the
cover
of
the chassis
through
which
the
GAIN
controls
for
LEFT
an
d
RIGHT
channels may be adjusted by a screwdriv
er
when the
unit
is
mounted in the turntable
c-abinet.
Three
printed circuit boards
PWl
,
PW2
and
PW3,
two
amplifiers
and
a power supply, are mounted on
the
chassis as shown in figure 7.
Three
degrees
of
high frequency response compensation are selected at
EQUALIZER
sw
it
ch S2:
NORM,
-H
IGHS, ROLL.
OFF.
Th
e
MODE
switch
Sl
selects the mode
of
operation, STEREO or
MONO.
Two
control knobs
and
a dial plate are supplied
with
the
necessary mounting hardware as well as the
pares required
for
adaptati
on
to the special features
of
the
turnt
ables.
The
se parts are identified
by
item
numbers as listed in the following chart:
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4
ll
em
Q1y. DescriPlion
I I S1ereophonic Preamplifier Equalizer
Asse
mbl
y
2 2
Knob
3 I Dial Plate
4 I Spacer
s 2 Shafi E
,([
ension 1/1x
l/1
x 1¾
6 2
Bu
shing
7 I Container for
hardware:
2 A scre
w,
llat head #8-32 x I
1/4
long
2 B setscrew, Allen #8-32 x
:~
fo
l
ong
2 C
nut,
hex,
1/s-32
2 D lockwasher, %
I E screw, llnt head, ;/tI0-32 x 11/.t long
2 F screw, hex head, #8-32 x
1/s
long
Circuits
The
BA-36A Preamplifier Equa
li
zer consists
of
rwo
four stage feedback amplifiers,
PW
l
and
PW
2,
and
a self-contained power supply,
PW
3, which are
mounted inside the chassis,
and
output
transformers,
Tl
and
T2
, power transformer,
T3
,
and
two switches,
Sl
and S2, which are mounted
at
the ends
of
th
e chassis.
Either
MONO
or
STEREO mode
of
operation
is
selected
by
sw
it
ch
SI
which is connected to the in
put
terminals of the amplifiers,
PWl
and
PW
2. For
monophonic mode
of
operation the
input
s of
PW
I
and
PW
2 are paralleled;
for
stereophonic operation,
each channel is fed
to
its respective amplifier.
Tbe
amplifiers
PWI
and
PW
2 arc identical a
nd
the fo
ll
ow-
ing description applies to either.
Resistor R
1,
together
with
the
input
impedance
of
Q
l,
provides correct pickup termination.
Tran
sistor
+20
QI
, a common emitter amplifier, is
RC
coupled
to
Q
2.
The
input
impedance of
Q2
is low so
that
most
of
the
signal current from the collector
of
Q l flows into
the
base of Q2.
The
signal
at
th
e co
lle
ct
or
of
Q2 is
coupled
to
the emitter
of
Ql through the feedback
networks C5, C7,
and
Rl
2
or
CG
and
R13.
The
first
network provides
NAB/R
IAA
response; the second,
provides flat response.
The
1000 cps gain is the same
for
either network. Either may be selected by a
strapping change
on
the amplifier board.
The
collector
of
Q2 is direct-coupled through re-
sistor
Rl4
to
the base
of
Q3,
an
emitter follower
stage. Resistor R14 provides a convenient method
for
varying the high frequen
cy
r
es
po
ns
e in conjunction
with capacitors
CL
a
nd
C2.
The
impedance of this
response compensation network
is
high compared
to
the
output
impedance of Q2 so chat the same degrees
of rolloff arc obtained wi
th
either the
NA
B/RIA
A
or
fl
at
response netw
or
k
s.
Bleeder resistors are
pr
o-
vi
ded
on S2
to
suppress sw
it
ch clicks.
The
GA
IN control
and
o
utput
stage Q4 arc iso-
lat
ed
fr
om the equalizing and compens
at
i
on
stages
Q1 and Q2,
by
Q3 which
is
an emitter follower.
The
gain control
RI6
pr
ovides a range
of
gain ad-
justment to obtain the required
output
le
vel with
pick
up
s of widely varying o
utput
levels. Sufficient
range
of
adjustment is
pro
vi
ded
for
nearly all pickups
presently ava
il
able.
The
dynamic range
of
stages Q1
to Q3
is
such chat
di
st
ort
ion does n
ot
increase
at
minimum gain setting
and
the
noise level
at
max-
imum serting is still below the noise generated by
the pickup when r
ep
roducing a record.
The
gain
control is isolated by two capacitors,
CB
and ClO to
I I I I
111
1 I I I
--
t--,..
r---
+1
0
ID
0
z
~
0
z
0
0.
(/)
w
a:
-10
-
20
20
'r-. EQUALIZER
SW
ITCH
S2
"'
i-,..
AT
NORM
POSITION
.............
1\14s
~
~
4s,._
~4Pp
r---!,ltl
c
FLAT
STRAPPING ~
1---...__
---........
i'--......
..........
100 1000
FREQUENCY
IN
CYCLES PER
SECOND
Figure
2-F
re
qu
ency
Res
pon
se
r--......
r-,...,,
~I'
~
~
10000
20000
8
026268
t
www.SteamPoweredRadio.Com
reduce noise during adjustment.
The
common emitter
output
stage Q4 has
an
outp
ut
impedance
of
600
ohms.
The
transformers T l
and
T2
provide
for
iso
la
-
tion
of
t
he
o
utput
signal
an
d the selection
of
output
impedances
for
each amplifier,
P\'<11
and
PW2
re
spec-
tively. The 1 ro 1 turns ratio assures excellent
frequency
re
sponse.
DC
power is provided by
th
e self contained AC
operated power supply
PW
3.
The
circuit consists of
two silicon rectifiers,
CRl
and
CR2,
and
RC
fi
lter
sections.
Fr
equency Response
The
curves in figure 2 show the response of each
channel
of
th
e equalizer
to
a constant vo
lt
ag
e
at
the
input
terminals wi
th
a
mat
ched load (150 or 600
ohms)
at
the o
utput
terminals.
The
EQUALI
ZER
sw
it
ch
S2
is in
the
NO
RM position.
Th
e unit as ship-
ped is connected
for
NAB/
R
IAA
standard equaliza-
tion as sh
ow
n.
The
flat response characteristic may be
obta
ined
for
special purposes by changing a
link
on
each amplifier board. Refer
to
Flat Resp
ome
under
I
NST
ALLATTON.
High Frequency Compensation
The
EQU ALI
ZER
switch S2 controls
the
degree
of
high
fr
e
quen
cy attenuation simultaneously
for
each
channel.
When
S2 is
at
NORM
position, the response
is as shown in figure 2.
The
-H1GHS
and
ROLLOFF
positions res
ult
in approximately 3.5
and
10
db
attenuation
at
10
,000 cps, as shown in figure 3, with
respect to
the
normal response.
The
same response
compensation is also obtained when the unit is
strapped
for
fl
at response.
Intermodulation Distortion
Intermodulation distortion
is
a measure of
non
-
linea
rit
y of a system
at
the lower
(larger
amplitude)
+20
CD
0 0
~
w
en
z
0
5
test frequenc
y.
The
typical distortion curve s
ho
wn in
figure 4 may be obtained in each channel with fre-
quen
cies
of
40/4000
or
400/4000 cps from a low
impedance so
ur
ce,
and
with
NAB/RIAA
or
Flat
response connection.
With
NAB/R
IAA response, the
ratio
at
the
ou
tput
is a
dju
sted to
4:
I.
A typical distor-
tion cur
ve
of the Ml-11865 universal pickup is in-
cluded in
fi
gure 4
for
refereocc.
The
input is the
RCA Lateral I.M.
Te
st
Re
co
rd
12-5-39.
Ten
percent distortion is n
or
mally
not
noticeable,
but
as
low
as
fi
ve perc
ent
distortion can
be
detected
by direct comparison
with
a clean signal by a trained
listener.
This
method is u
se
d
for
testing disc repro-
ducing systems since harmonic distortion methods
ar
e
not
practical. Therefore the preamplifier is
de
-
scribed on the same basis, so chat the performance
of
the
pi
ckup and equalizer may be directly compared.
The
preamplifier o
utput
correspo
nd
s directly to the
input
ve
locity as sh
ow
n,
si
nc
e
the
gain
is
adjusted
with
a test reco
rd
as described
in
the Gain
Adjust-
me
11t
Proce
dur
e, I
NSTALLATION.
Harmonic Distortion
As shown in figure 5, the harmonic distortion
curve, using a test frequency of
400
cps, corresponds
to
the
intermodulation
di
sto
rti
on curve
in
figure
4.
The
c
ur
ves are nearly identical exce
pt
that
the di
s-
tortion
scale
is
magnified four times.
Th
e curve was
obtained with
Jl
at
response scrapping
wit
h t
he
input
connected
to
a low impedance source.
The
same
ho
r
i-
zontal scale is us
ed
since
the
gain was adjusted as in
figure 4. Since
the
peak level
of
most records does
n
ot
exceed 17.5 cm/sec, in
th
e lateral direction, figures
4 a
nd
5 show
that
both the pickup
and
amplifier di
s-
tortion remain well within acceptable limits
for
each cha
nn
el.
NOR
M
AL
---
--~
--
.........
.....
~
-9o(
-...._
(o,,.,
""'
/:'
B,,
-10
w
ADD
THESE
CURVES
TO
THE
RIAA
~
a::
-20
20
OR
FLAT
RESPONSE
CURVES
TO
O
BTAIN
THE
RESPE
CT
IV
E
OVERALL
RESPO
N
SE
I I I I I I
11
I I
00
1000
F
RE
QUE
NCY
IN
CYCL
ES
PER
SE
CO
ND
Figure
3-Response
Characteristics
of
EQUALIZER Switch
S2
10000
20000
8026267
www.SteamPoweredRadio.Com
6
18
16
z
o
14
....
0:::
0
12
....
(/)
O
10
~
H 8
....
~
6
u
0:::
w 4
a.
2
0
4
z
0
l-
o:
03
I--
Cf)
0
u
z2
0
~
0:
<{
I
1-
z
w
u
0:
0
w
a.
PICK UP(RCA
RECORD
12-5-39)
:4
00/
4
000
cps
4=I I
I
PREAMPLIFIER=
40/4000
cps
OR
400/4000
cps
4
=1
I
I
I J
II
/
;-TYPICAL
M
!-11
865
PICKU~~
t/
TYPICAL
BA-36A
PREAMPLI
Fl
ER
--
""-L
...
--------____:::::::;,
..--
--
-20
-15
-10
-5
0
+5
OUTPUT
LEVEL
-
DBM
5.5
10
17
.5
31
LATERAL
INPUT VELOCITY - CM
./
SEC.
8026266-1
Figure
4-lnlermodulation
Distortion
I l
IN
PUT
FREQUENCY
400
CPS
I
I
I
/
---
L---,/
-....--
-20
-15 -10
-5
0
+5
OUTPUT
LE
V
EL
-
DBM
5.5
10.0 17
.5
31.0
LATERAL
INPUT VELOCITY
-C
M
./S
EC
.
8026313
Figure
5-Harmonic
D
ist
orfion
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7
INSTALLATION
Unpac
ki
ng
Unpack
th
e
unit
carefully a
nd
c
heck
to
be
cena
in
ch
at
all
accessories
a
nd
mountin
g
ha
rdwa
re
arc
sup-
plied
according
to
th
e p
ac
kin
g list. T
he
traosist0rs
are
s
upplied
mount
ed
on
th
e c
ircuit
b
oar
ds.
Mount
ing
The
unit
may
be
mount
ed
in
the
BQ-51
Turn
table
Cabinet
directly
on
th
e
cab
in
et
bracket.
The
br
ac
ket
has
the
proper
hol
es
to
accom
modate
the
BA-36A
mounting.
To
mount
th
e
unit
in
any
other
cab
inet
.
turnt
ab
le or custom
inst
all
ation,
u
se
th
e
template
shown
in
figure
10
to
drill
the
proper
mo
unting
holes.
NOTE:
T
he
h11shi11gs
,md
shaft
ex
ten
sions
rnpplied
with
the
unit
are Jno~•
ided
to
11ccf)111
111
odate
ex
le11ded-tyjJe m
ou11
ti11
g
for
pec11/
i
,II"
sit
11
atif>1JS
u·here direct
111()1mti11g
is
notpossible.
Output
Connections
Th
e
equa
li
zer is
shi
pp
ed
\·v
ith
th
e
output
trans-
formers
Tl
and
T2
connected
for
600
ohm!>
output.
For
150-ohm
out
put
,
remove
the
jumper
from
termi-
nals 2
an
d
3,
then
connect
jumpers
between
1
and
2
and
between
3 a
nd
5
on
each
transformc:r.
Po
wer
Transformer
Connections
Th
e p
ower
transformer
T3
is
designed
for
op-
era
t
ion
at
l
05.
11 5,
and
125
volts (
prim
ary
con
-
nected
in
paraUel)
and
210, 230,
and
250
volts
(pr
i
mary
connected
in
se
ri
es)
50/60
cycles.
Th
e
unit
is
shipped
from
the
factory
connecte
d
for
a l l 5
volt
line.
for
line
voltages ocltt:r
than
115 , o
lt
,
the
line i
npu
t
co
nn
ections
to
taps
3
and
3A
may
have
to
be
changed
(
for
detailed
connections,
see
fi
gure
11
).
Flat
Response
To
obtain
a llat
response,
change
the l
ink
s in
the
ampl
ifi
ers
PW
l
and
PW
2 from J
and
H
and
con•
nect J a
nd
K.
The
l
000
cps
gain
is
the
same
as
wirh
NAB/
RIAA
response.
With
the
link
con•
nected
to
K,
the
net,.vork
pr
ovides
addit
i
ona
l
appli-
cations
for
the
BA-36A
equalizer:
I. A
simpl
ifi
ed
response
test
may
be
easily
made
using
an
osci
llacor
at
the
inputs
of
the
system.
2.
The
pream
plifi
crs
PW
l
and
PW2
may
be
used
,ls flat amplifiers.
3.
Constant
velocity rest
records
may
be
used
to
test
the
pickup
s
in
ce
the
output
voltage
obta
ined
from
the
preamplifiers
corresponds
10
the
ou
tpu
1
volrage
of
the pi
cku
p.
4. H
armonic
distortion
measurements
of
the
pre-
amplifiers may
be
made
using
sranclard merhocls
for
lla1
ampl
ifi
er
i,.
S.
Int
ermodulation
distortion
measurements
of
1hc
pi
ck
up
(p
lus
the
preamplifiers)
may be
made
using
RCA T
est
R
ec
ord
12
-5-39
and
an
I
ntermodu-
lation
Di
stortio
n Analyzer
connec
t
ed
at
the
pr
e-
amplifi
er
output
s.
AC
Cord
The
thr
ee-wire, 6-
foot
cord
is
connected
to
the
equalizer.
It is necessary
to
plug
int
o a
sw
itch-
controlled,
grounding
type
AC
outlet.
Gain
Adjustment
Procedur
e
When
the
R
CA
pi
ckup
Ml-
l
1865
has h
ce
n
c~')n-
nected
throug
h
the
t
one
ar
m co
the
IN P
UT
termi-
nals
,
th
e LEFT
and
RI
G
HT
GAlN
cont
r
ols
muse
be
adjus
t
ed
ro o
bt
ain 1he
correct
output
levels. Any
other
stereo/monophonic
pi
c
kup
may
be
used
which
has
an
output
voltage
rating
from
.002
v
to
.0
l ,..
The
levels may
be
read
on
the
co
n
solette
meters
or
a
meter
may
be
connected
across
the
out•
puts
on
TBl.
Ref
er
to
the
sc
hematic figure 11.
On
the
l
000
cps
reference
band
of
the
test
record,
ad
ju
st
the
LE
FT
and
RIGHT
GAIN
con
trol
s
to
pro-
duce
the
indicated
ou
tp
ut
level.
Any
of
the
foll
owing
cest
records
may
be
used,
however,
the
lat
era
l rec-
o
rd
s
are
recommended
to achieve
most
accurate
balance
of
output levels.
Tt'sl
Record
Pe
,
tk
Vclocity 011/Jml
Ln
RCA
12
-
5-
0
19
or
12-5-5
I
5.5
cm/sec
-
20
dhm
(0.7
and
LO
mi
l
stylii)
laceral
RCA
I
2-5-50
5.5
cm/sec
-2
0
Jhm
(
\l.
7
to
2.5
mil
stylii) lateral
RCA
I
2-5-
71
3.9
cm/sec
(45
•)
-
20
db,n
COS S
TR-
I
011
5.0
cm/sec
(-15 ) -
18
dbm
WI
estrex
t
-A
5
.0
cm/sec
(4
5 ) -18
dhni
Th
e
gain
adjustment
pr
oced
ur
e resulrs
in
-20
VU
output
on
average
stereo
or
monopoonic
re-
cordings.
Du
e
to
the
wide
dynam
ic r
ange
of
BA-
36A,
acceptab
le results may
be
obta
in
ed
if
the
output
levels
can
be
set
±;
<lb
of
this
above
specj
fi
cat
i
ons,
in
the
case
of
pickups
having
very
high
or
low
o
utpu
t levels.
CAUTION:
If
the
1·ecr,111111emletl
o
utput
le,
•
el
camwt
he obtained, the pickup 0
11tJ111t
l'O!tuge
should he checked
at
the
i11p
11t
ter111i11,tl
s.
If
the
J1icl
w
/1
l'Ol1£1ge
(011
the RCA Test Records)
is
be
t1
cee11
.
002
and
.Ol
l'O
!t
s,
the
prea111/1Lifie,
·
is
1101
Ji111ctio11i11g
properly 0
1·
is imJ1roperly
cmmected. If the
Jn'clmp
levelis outside
of
tbe.
fe
limits, the
/Jrea111plifler
is
f
1111
cti1mi11g
jlrnperly.
Check
the
111u1111f,1c/11rer's
specijicfltir,m to de-
ter111i11e
if
the
pick11/J
m1sitfri
ty
(milliml!J/
nm/ec)
is U'ithin
its
mted
limit.,.
www.SteamPoweredRadio.Com
8
Int
e
rconn
ections
If
the
RCA
pickup
Ml-1186
5 is u
se
d,
no
cha
n
ges
arc
required
for
s
hunt
resistor
R l
in
the
input
circuit
of
the
amplifi
ers
,
PW
I
and
PW
2.
for
o
th
er
pickups
selec
t
from
th
e
table
in
figure
11
the
value
required
for
R1,
in
each
ampli
fi
er,
to
give che
manufacturer's
Terminal
r,mctiou
L. IN
Lef1
lnptH
-
GND
Left
signal
ground
R.
IN R
ight
I
nput
-
GND
Right
signal
ground
-
AR
M
GND
Mecallic
parts
of
tone
arm
ground
+ LEFT
-
OU
T
Lcf1
ou
t
put
1
50/600
ohms
+
RI
GHT
-
OU
T
Right
ou1p111
I
50/600
ohms
MTR
(;NI)
T11rn1able
motor
ground
recommende
d
carcridge
lo
ad.
The
term
i
na
l
board
TB
1
is
mounted
outsi
de
the
c:qualizer ch
assis
and
the
terminal
fun
ctions
arc
stenci
l
ed
on
the
case.
The
fo
ll
owing
ch
art
indi
cates
che
connect
i
ons:
C
o1m~
c
tio11s
Left
channel
signal
lead
from
tone
arm
-
L
eft
channel
ground
lead
from
mne
arm
Right
channel
signal
lead
from
tone
arm
-
Right
channel
ground
l
ead
from
tone
arm
-
---
--
.
Electrosta
ti
c
ground
lead
from
t
one
arm
--
--
--
Connec1
<lirecdy
10
left
mixer
buss
of
consn
l
eue
•
--
-
Connect
directly
m
right
mixer
buss
of
consolene
*
-
----
- -
Connec
t
ed
co
motor
frame
(
preamplifier
must
he
con
ne
c1ed
to
ground
1hr
oug
h
its
line
cord)
•Ou
tp
ut
of
each
cha
nn
el
must
be
loaded
with
I SO
or
600
ohms
for
proper
operation.
Connec
tion
s may
be
made
to
low
l
eve
l
microphone
or
1ranscription
inputs.
To
do
this
the
BA
-36A
oucputs
must
he
arcenuated
wi1h
suit
ab
le
pads
(30
db
approx.
each.)
MAINTENANCE
Print
ed
circuit
board
s
may
be
se
rv
iced
or
replaced
as
required.
Th
e
following
proc
e
dures
cover
th
e
repl
aceme
nt
of
components.
Th
e e
ntir
e
circuit
hoard
may be re
pl
ace
d by de
taching
1he
connections
at a
ll
rermin
a
ls
whi
ch
are
le
tc
ered
in
th
e a
mplifier
s
PW
1
an
d
PW
2 a
nd
numbered
in
the
pow
er
supply
PW
3.
If
,
the
boards
mu
st
be
removed
from
the
e
qu
a
liz
er
for
servicing,
rep
l
ace
them
in
the
sa
me
orientation.
Be s
ur
e
10
po
s
ition
the
c
ircuit
boards
so
th
at
th
e
terminals
mark
ed A a
nd
Bon
PWl
and
PW2
and
I, 2,
and
3
on
P\Xf3
arc
in
th
e
sa
me
location
as
sh
own
in
figure 6.
Be
s
ur
e
tO
rep
l
ace
th
e 1/ 16 a
mp.
3AG
fuse,
when
requi
r
ed,
with
a
fu
se
of
id
e
nti
ca
l r
at
in
g
and
rype.
Servicing
of
the
Etched
Wiring
Board
Assemblies
The
c1ched
wiring
b
oards
are
made
of
.062
inch
chick l
ami
na1
cd
epoxy
IO
one
s
id
e
of
w
hi
ch is
bonded
a
thin
sheet
of
co
pper
.
The
concluct0r
p
atte
rn
is
formed
hy
an
e1c
hin
g
process.
Component
leads
are
threaded
1hro
ugh
hol
es
which
are
punched
into
the
board.
The
ends
of
the
l
ea
ds
ex
1ending
through
chc
board
are
bent
ove
r
against
1h
e
co
pp
er
cond
u
crors.
T he
com
plete assembly is s
ub
seque
ntly
dip-
so
ld
ered.
Co
mpon
e
nt
s may be re
pla
ce
d
eas
ily by fo
ll
ow
in
g
rhcse
simple
in
structions.
Care
should
be
observed
not
to
damage
th
e
bonding
a
dhesi
ve
by
applying
too
much
he
at
dur
i
ng
so
ld
e
rin
g.
l.
T
oo
ls Re
q11ir
ed
a. A s
mall
(35
wan
or
le
ss)
pencil-type
so
ld
er
ing
iron.
b.
A pa
ir
of
small
di
ago
nal c
utt
er
s.
c. A
pair
of
sma
ll
lon
g
nose
pli
ers.
cl.
A
scribe
or
pi
c
k.
e. A
sm
all
kni
fe.
2.
Emergency Repr,irs
If
it
is
known
which
co
mpon
ent
is d
efect
ive, ir
may
be
replaced
witho
uc
re
moving
the
bo
a
rd
from
it
s
mounting.
a. I n the
case
of a
sma
ll
component,
suc
h
as
a ¼
or
½ ware
resistor,
c
ur
the
co
mpon
en
t
in
half
usin
g
diagonal
pli
ers.
Cr
ush the bo
dy
by
means
of
the l
ong
nose
pli
ers.
Thi
s is
done
co
obtain
ex
tr
a l
ead
len
g
th.
In
the
case
of
l
arge
r
com
p
onents,
clip
th
e l
eads
as
close
as
pos
s
ibl
e co
the
co
mponent
body.
h.
Us
in
g l
ong
nose
pli
ers,
form
a l
oop
of
the
le
ad
ends
as
s
hown
in
figure
9.
1
ij
www.SteamPoweredRadio.Com
'
\
l
r
9
SI
R3
R4
Rl6
PW3
CR
I
CR2
XFI
r
S2
TBI
:.----Tl
C4
C3
Cl
C2
QI
02
Q3
Q4
Rl6
31221-7
Figu
re
6-Type
BA
-36A Preamplifier with
Cover
Removed
c.
Thread
the
l
eads
of
the
new
components
through
these
loops.
Cut
off
the
excess
lead,
cr
imp
and
solder
the
connection
.
3.
Permanent
Repairs
a.
Remove
the
hardware
fastening
the
board
to
the
chassis
and
tilt
board
up.
b.
I
solate
the
defective
component.
If
it
is neces-
sa
ry
co
disconnect
a
component
from
th
e
circuit
for
test,
heat
the
juncti
on
of
the
co
mpon
ent
lead
and
the
etched
wiring
with
the
so
ld
ering
iron.
The
h
ea
t
shou
ld
be
concentrated
on
th
e
component
lead
rather
than
the
etched
wir
in
g
pattern.
Pry
up
and
straigh
t
en
the
bent-over
portion
of
the
compo
n
ent
lead
wit
h a
knife
blade,
then
pull
lead
th
rough
the
hole
w
it
h pliers.
c.
To
remove
the
defective
component,
snip
the
leads
off
at
the
component
side
of
the
board.
See
figure
9.
d.
Using
a
small
solderi
ng
iron
(35
watt
or
less)
heat
the
leads
and
remove
them
from
the
printed
wi
ring
side
of
the
board.
Be
careful
not
to
apply
too
much
heat
or
force
co
avoid
damage
co
the
copper
conductors.
e.
Clean
and
preform
the
leads
of
the
new
com-
ponent
and
insert
through
the
holes
until
the
com-
ponent
body
is
tight
aga
in
st
the
board
.
f.
On
the
ci
rcuit
s
id
e,
grasp
the
component
lead
and
be
nd
it
over
in
the
dir
ect
i
on
of
the
circ
uit
pattern.
g.
Cri
mp
the
wire
tightly
against
the
board
(see
figure 9
),
an
d c
ut
off
the
excess
com
pon
ent
leads.
Leave
abo
ut
1/ 1
6-inch
of
w
ir
e
protrud
i
ng
from
the
edge
of
th
e bole.
h.
H
eat
the
le
ad
and
app
ly
rosin
core
solder.
DO
NOT
USE
PA
STE
OR
ACID
FLUX.
Remove
ex-
cess
rosin
from
the
jo
int
s
wit
h
alco
hol.
i.
Rep
lace
the
circuit
board,
u
si
ng
the
o
ri
ginal
h
ardware.
4.
Vertically
Mo1111ted
Capacitors
The
vertically
mounted
capac
it
ors
are
designed
with
both
leads
protruding
from
one
end.
On
the
electro
lytic
capacitors,
the negative lead is slightly
l
arger
than
the
positive
lead.
Th
e
two
h
oles
on
the
etc
h
ed
wiring
board
correspond
in
size
so
that
the
electro
lytic
capacitors
may
be
mounted
only
one
way
thus
assuring
correct
polarity. R
efer
to
the
com-
ponent
assemb
lies figures 7 and 8.
www.SteamPoweredRadio.Com
5.
TnmsiJtors
To
replace
transistors
on
the
circuit
boards,
un•
solder
che
lead
at
each
of
the
three
slotted
terminals.
Each
termina
l
is
identified
with
the
leHers C, 8, E
(co
ll
ec
t
or,
base,
emitter)
stenc
il
ed
beside
them.
Refer
to
figure
11
for
the
bouom
view
of
che rwo
types
of
transis
t
ors
and
the
basic
schematic.
To
mo
unt
a
new
transistor,
cut
the
leads
to
'/2
inch.
T
ac
k
solder
the
corresponding
l
ead
in
the
sl
ot
of
eac
h
terminal.
Then
bend
the
transistor
to
an
up-
right
po
sit
i
on.
DO
NOT
WRAP
LEAD.
T
l}
REM
O\/E
01:'.
fE
C
TI
\/E
CO
MP
O
NENT
8 PU
LL
our HE
RE
COM
PO
NENT
CU
T
Off
HERE
"'
TO
IN
S
TAL
L
Nf
N COl
~P
O
NENT
CUT O
ff
HERE ANO SOLOt.t<
'-
CO
MP
ONE
NT
80IIRO
BENO WIRE
WI
TH
PLIE
f'
S
BOARD
TO
RE
ll'
OVE
CO
,..P
O
NEN
T
fRO
II' TOP
Of
CI
R
CUIT
BOARD
SOLDER
PIGTAIL
OF
NEW
CO
MP
ONENT
TO
LOOPED
ENO
.
Figure 9
-R
eplacement
of
Components
in
Printed
Circuit
11
www.SteamPoweredRadio.Com
12
Symbol
Cl
C2
C3
C4
F1
PWl
PW2
PW3
R1
R2
R3
R4
Sl
S2
Tl
T2
T3
XFl
C1
C2
C3
C4
cs
C6
ca
C7
C9
ClO
C
11
C12
Ql
Q2
Q3
Q4
R1
R2
R3
R4
RS
R6
R7
RS
R9
RIO
Rl
1
R12
R13
R14
R15
R16
R17
Stock No.
232342
23231
•3
232342
232343
52664
227728
227728
227729
227358
227358
227358
227358
226961
227727
226965
226965
232335
205914
232336
232337
232188
232338
227356
232339
23
234
0
227357
232337
232337
232341
232188
224696
223366
223366
223366
227755
219467
22
3770
223z10
219
65
219458
108866
1
08871
285404
300739
226975
219461
285403
300739
219461
226979
10886i;
REPLACEMENT PARTS
Drawing_No.
3462014-212
3462014-217
3462014-
212
3462014-217
990157 - 2
8760933-503
8760933·503
8760935·
503
99206-
255
99206-
255
99206-110
99206-110
8486010- 1
8486009- 2
8469304- 2
8469304- 2
3463052- 1
8811104- 1
3462363- 4
3462363- 5
3462363- 3
3462363- 6
8974499-75
3462363- 7
3462363- 8
89741.99-
69
3462363- 5
3462
363- 5
3462363- 9
3462363- 3
99206-90
99206- 79
99206-88
99206-88
99206-
73
99206-
147
99206- 66
99206-
82
99206- 80
99206-
175
99206-
45
99206-169
99206-
172
99206- 175
99206-
67
8537146- 1
qg206-159
Description
STEREOPHONIC
PRE-
A
MP
-
EQUALIZER
Ml-11441-B (BA·36A)
CAPACITORS
FILM,
3900
PF
i5
% 6 V
FILM,
10,000
PF
±5
%
ioo
V
FI
LM,
3900
PF
±5
% 6 V
FILM
, 10,000
PF
±5
% 200 V
FUSE
-1/16 A
3AG
CIRCUIT
BOARO
ASSEMBLY
(PRE
AMP)
CIRCUIT
BOARD
ASSEMBLY
(PRE
-
AMP)
CIRCUIT
BOARO
ASSEMBLY
(POWER
SUPPLY)
RESISTORS· FI
XED
COMPOSITION,
UNLESS
NOTED
10
MEGOHMS
±10
%
1/4
W
10
MEGOHMS
±10
%
1/4
W
10
MEGOHMS
±10
%
1/4
W
10
MEGOHMS
±10
%
1/4
W
SW
I
TCH
-
ROTARY
SWITCH
·
ROTARY
TRANSFORMER
-
AUDIO
TRANSFORMER
-
AUDIO
TRANSFORMER
-
POWER
HOLDER
-
FUSE
COMPONENT
BOARD
ASSEMBLY
-
PW1
-
PW2
CAPACITORS
ELECTROLYTIC,
2.2
MF
±20
% 6 V
ELECTROLYTIC,
33
MF
±20
% 6 V
ELECTROLYTIC,
100
MF
±20
%
15
V
ELECTROLYTIC,
4.7
MF
±20
%
15
V
PAPER,
0. 1
MF
±
10
%, 200 V
ELECTROLYTIC
.
22
MF
i20
% 15 V
E
LECT
RO
L
YTI
C
47
MF
±20%
12
I/
PAPER,
0.033
MF
±1o
r . 200 V
ELECTROLYTIC,
33
MF
±20
% 6 V
ELECTROLYTIC,
33
MF
±20
% 6 V
ELECTROLYTIC,
220
MF
±20
% 6 V
ELECTROLYTIC
,
100
MF
±20
%
15
V
TRANSISTOR
-
TYPE
2N220
TRANSISTOR
-
TYPE
2N404
TRANSISTOR
-
TYPE
2N404
TRANSISTOR
- T
YPE
2N404
RESISTORS
-
FIXED
COMPOSITION
,
UNLESS
NOTED
220,000
OHM
±10
%,
1/4
W
27,000
OHM
±10
%,
1/4
W
150,000
OHM
±10
%,
1/4
W
150,000
OHM
±10
%,
1/4
W
8200
OHM
±10
%,
1/4
W
330
OHM
±5
%, 1
/4
W
2200
OHM
±10
%,
1/4
W
47
,000
OHM
±10
%,
1/4
W
33,000
OHM
±10
%,
1/4
W
4700
OHM
±5
%,
1/4
W
39
OHM
±10
%, 1
/4
\'I
2700
OHM
±5
%,
1/4
W
3600
OHM
±5
%,
1/4
W
4700
OHM
±5
%,
1/4
W
2700
OHM
±10
%, 1/4 W
VARIABLE
, 5000
OHM
±5
%,
1/4
W
1000
OHM
±i;
%
1/4
W
www.SteamPoweredRadio.Com
Symbnl
R18
R19
R20
R21
R22
R23
R24
Cl
C2
C3
C4
CRl
CR2
Rl
R2
R3
S1ock
No.
219464
226971
108867
108865
285442
226972
227741
232332
232333
232334
232334
255726
255726
502151
502147
502116
226962
250203
226688
REPLACEMENT PARTS (cont)
Drawing_No.
99206-
71
99206-178
99206- 72
99206-159
99206-155
99206-128
99026-59
3465828- 1
3465828- 2
3465828- 3
3465828- 3
82283-
152
82283-
151
82283-140
8537126- 2
712336-507
8529047- 3
5600
OHM
±10%,
l/4
W
6200
OHM
±S
o/
,
1/4
W
6800
OHM
±10%,
1/4
I'/
1000
OHM
±5
%,
1/4
W
680
OHM
±5
%, I
/4
W
51
OHM
±5
%,
1/4
W
560
OHM
±10
%,
l/4
W
Descriptinn
COMPONENT
BOARD
ASSEMBLY
-
PW3
CAPACITORS
ELECTROLYTIC
, 50
MF
50 V
ELECTROLYTIC
, 100
MF
50 V
ELECTROLYTIC,
500
MF
15
V
ELECTROLYTIC,
500
MF
15 V
DIODE
-
TYPE
IN3193
DIODE
-
TYPE
1N3193
RESISTORS
-
FIXED
COMPOSITION
510
OHM
±5
%,
1/2
W
470
OHM
±5
%,
1/2
W
l 60
OHM
±5%, 1
/2
W
MISCELLANEOUS
ESCUTCHEON
KNOB
TERMINAL
-
TRANSISTOR
(3
PER
STOCK
NUMBER)
13
www.SteamPoweredRadio.Com
14
6.76
......
r
--
2.19
I
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, 3.125 1.62
_....
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3
l6 DIA.
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DIA. X
82°
CSK
~DIA.HOLES
3
IG
DIA.
HOLE
~~
DIA. X
82°
CSK
NOTE:
DRILL
HOLES
A,B,C
AND D
AS
SHOWN FOR
INSTALLATION
OF
THE
PREAMPLIFIER
EQUALIZER
IN
TURNTABLE
NOT
RCA
MODEL,
ALLOW
MINIMUM
OF
.05
INCH
CLEARANCE
ON
TWO
SIDES AS SHOWN.
LEFT
HAND SIDE
MUST
BE
OPEN
FOR
ACCESS
TO
GAIN
CO
NTROLS
.
802634
0
Figure
JO-Template
for Mounting Preamplifier Equaliz
er
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80262
71
15
Figure
1
J-S
1
chem
atlc
Diagram
for
BA-36A
Preamplifier
Equalizer
I
www.SteamPoweredRadio.Com
EQUIPMENT
LOST
OR
DAMAGED
IN
TRANSIT
Wt1en
delivering
lhe
eq
u
ipment
to
you, tile
truck
driver
or
carrier's
:igenl
will
presem:i
receipt
for
your
signature.
Oonol
sign
It
until
you
have
(a) In
spec
ted
th,;,
co
nt.'lin
ers
for
visible
signs
of
damage
and
(b)
cou
nted
the
co
ntainers
nnd
compared
wllh
the
amount
~hown on th~
shipping
µapers.
If
a
sho
rtage
or if
evidence
of
damage
Is noted,
Insist
that
notation
to
thateCfccl
be
made
on
theshipplngpnpers
bcfurn
you
sign
them.
Fu
rther,
a!lcr
rL'Celvingthe
equipment,
unpack
It
and
lnspt.>Cl
thoroughly
for
conceo
led
damage.
If
conceafod
damui:e
is
discovered,
lm111edlaiely
notify
the
ca
rrler,
confirm
Ing
the
notification
m
writing,
nnd
secure
an
IMpection
,·
epor
t.
This
item
should
be
unpacked
nnd
inspected
for
damage
WITHIN 15
DAYS
after
r
eceip
t.
Report
all
sho
rta
ges
and
da-
mages
lo
RCA, CommercoaJ
Elect,·onic
Systems
Division
-Camden,
New
Jersey
01jJ02.
RCA will
(lie
:ill
claims
for
loss
and
dnmage
on
this
equipmen
t
so
long
as
the
onsµection
report
is
obt:uncd.
Dlsposlllon
of
the
damaged
lte,11
1
will
he
(urnoshed by RCA
FIELD
ENGINEERING
SERVICE
ltCA
Field
Engineering
St•rvlce
is
available
al
current
rates.
Requests
[or
(leld
cnglnccrlngscrvioe
may
be
addressed
lo
yoo
r
RCA
Broadcast
l'icld
Rcprcsentallvc
or
the
RCA
Service
Company,
Incorporated
-
Broadcast
Service
Division
-
Camden,
New
Jersey
1)
81
0l
.
Telephone
609-963-6000.
WARRANTY
ITEMS
Partlculnr
parts
and
/
or
equipments
covered
by
wnrra
.
nty
arc
speciC-
lcally
stated
as
such
in
the
warranty
or
contract
given
to
Ute
customer
at
the
time
of
sa
l
e.
The
warranty
or
con
trncl
alsostipulnlcs
the
condi-
tions
und
er
which
the
warranty
may
be
exercised.
To
obt:l!n n
ew
rcplnccmcnt
for
auch
warranty
items.
cont:iot
your
local
RCA
sales
office
nnd
please
supply
Produc
t
ldcnlificnlion
(Including
the
Original
In
voice
Number.
Ml
Number,
Type
Number,
Model Number,
and
Serini
Number)
rtnd
Replacement
Part
ldenlificaUon
(Including Stock
Number
and
Description).
Requests
for
warranty
replacements
m11Y
be
unduly
delayed
if
all
this
informatio
n
is
not
suµplic<l.
REPLACEMENT
PARTS
When o
rd
ering
rnplacemenl
parts,
please
give
Stock
or
Master
ltem
(Ml)
Number,
fluscripllon,
and
Symbol
o(
each
Item o
rd
ered.
the
opera
ti
on
o(
the
<Jquip
on
enl.
Thi,
pa
rt
which will
be
supplied
against
an
order
for
a
replucemcnt
Item
may
not
he
an
exact
duplicate
of
the
original
par
t.
However,
it
will
be
a
satisfactory
replacement
dlfferlng
only
In
minor
mechanloal
or
elect
r
ical
c
hara
cteristics.
Such
dlJJerenccs
will In
110
way
impair
Emerg
e
ncy
Service
For
emergency
services
nfter
working
hours,
contact
RCA
Parts
and
Accessories,
Telephone
609-963-8000.
LOCATION ORDERING INSTRUCTIONS
ronllnenlal
United
Stales.
including
Rcplaocment
Parts
bcarln~
a STOCK
NUJ.1
llER
should
be
ordered
from
HCA
Pnrts
nnd
Accessorleir
Alaska
and
Hawaii
2000
Clruncnl.il
llrldge
Rood -Dcpt{ord,
N,:,w
J,:,rscy
06096
.
Replacement
Paris
bearing
a MASTER
ITEM
(MI) NUMBER
should
bl
•
ordered
from
RCA,
Commercial
Electronic
Systems
Division
-
Attcnllon
Commercial
Service
-
Camden,
NewJersoy
08
102
or
your
nearest
RCA Regional
omce.
Heplac<'menl
Parts
with
NO
STOCK
or
MASTER ITEM
(Mn
NUMB~;R
are
St.'lmfard
components
,
They
are
not
st
ocked
by
RCA
and
should
be
obtained
from
your
local
elec
tr
onics
distributor
.
Dominion of Canada
Order
from
your
local
RCA
Sulos
Representative
or
his
o!Cloc
or
fr
om:
RCA
Victor
Company
l,imited,
I
OOL
Lenoir
SlYeel, MontJ•enl,
Quebco.
Outside
of Continenl:11 United
Slates,
Order
from
your
local
RCA
Sales
Represcnlatlve
or
from:
RCA
International
Division,
Clark,
Alaska,
Hnwn1i, and
the
Dominion
of
N,:,w
Jersey
-
U.S
. A, -
Wfrc
: RADIOINTER
Canada F.mergency:
Cable
RADIOPARTS,
DEPTFORD,
N.
J.
RETURN
OF
ELECTRON
TUBES
If
for
any
reason
tt
Is
desired
lo
return
lubes.
please
r<'turn
them
through
your
local
RCA
tubedislril>utor,
RCA
Victor
Company
Limited,
or
RCA
International
Divisio
n,
depending
on
your
locallon.
IL
Is
imporllln
t
tbnt
complete
informallon
regarding
caoh
lube
(Including
type,
scri:tl
number,
hours
of
S<'rviee
and
r<'ason
for
its
return)
be
given
. When
tub
es
nre
returned,
they
should
be
shipped
lo
the
address
spec,Ciedon
the
RelurnAulhorizalion
form.
A copy o.fthe
RelurnAulhor-
lzatfonand
nlson
Sc~vlce
Report
for
each
lube
should
be
packed
with
the
tubes
Please
do
not
return
lubes
dlrco
tly
lO
R
CA
without
authorization
and
shipping
instrucllons.
LOCA1'10N
Continental United
States,
including
Loon! RCA
Tube
Distributor.
Alaska
and
H
awaii
ORDERING INS'rRUC1'10NS
Dominion of
Cana
da
Order
from
your
local
RCA
Sales
Rcprosonlative
or
his
omce
or
fr
om:
RCA
Victor
Company
Limited,
1001
Lenoir
Street,
Montreal,
Qucllec.
Outside
o[
Conllnental United Sl.~U!s,
Local
RCA
1\1be
Distributor
or Crom:
RCA
Jnternalional
Division,
Clark,
NcwJersey,
U.S.A.,
Alaska,
Hawaii,
u.nd
the Dominion of
Wire
: RADION1'ER
Cana
da
Emergency:
Cnblc
RADIOPAR'rS. DEl'T~'OHD, N.
J.
BTE-M3
Other manuals for BA-36A
1
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