Stanton 210 B User manual

INSTALLATION
AND
OPERATING
INSTRUCTIONS
MODEL
210
I3
STEREO
TURNTABLE
PREAMPLIFIER/EQUALIZER
COPYRIGHT
1974
STANTON
MAGNETICS,
INC.
PLAINVIEW,
~EW
YORK
. ,

I.
SPECIFICATIONS
I-I
GENERAL:
The
Stanton
Model
210B
Preamplifier
is
designed
for
Professional
use
as
a
stereo
turntable
preamplifier
with
the
standard
NAB
(Mar
'64)
record
playback
equali-
zation.
It
may
also
be
used
as
two
separate
monophonic
channels.
The
unit
is
equipped
with
front
panel
gain
and
high
frequency
adjustment
controls
for
each
channel.
In
addition,
it
has
provision
for
use
as
a
dual
flat
response
preamplifier
by
means
of
a
front
panel
switch.
Provision
is
made
for
table
top
or
panel
mounting.
,
1-2
DETAILED
SPECIFICATIONS:
Output
Level:
Distortion:
Output
Impedance:
Frequency
Response:
Gain
(Controls
at
max.)
Maximum
input
level
before
clipping
@
1kHz:
Noise
(Input
terminated
in
cartridge):
Input
Impedance:
Channel
Separation:
Input
Connectors:
Output
Connectors:
Power
Requirements:
Mechanical
Dimensions:
Mounting
Provisions:
1-1
+20
dBm
Maximum
Less
than
0.25%
@
+20
dbm
150
or
600
ohms,
internally
Selectable
Transformer
Output.
Shipped
wired
for
600
ohm
isolated
outputs.
+ldB
from
30
to
20,000
Hz
Either
Flat
or
NAB
Standard
Equalization
Curve.
Individual
high
frequency
adjustments
for
N1\B
curve.
52dB
+2
@ 1 kHz
(NAB)
54dB
+2
@ 1
kHz
(FLAT)
150
mV
Better
than
-60dB
Ref.
5.0
mV
input
(NAB)
47,000
ohms
60dB
Minimum
(30-15kHz)
RCA
Phono
Jacks
Five
Terminal
Barrier
Strip
117
Vac
60
Hz,S
W
Panel
3
1/2"
x 9
1/2"
Overall
Case
Size
3"
x 8
1/2"
x
7"
behind
panel
Normal
Table-Top
or
Cabinet
Mounting.
Optional
Rack
Panel
Adapter
Available.

II.
INSTALLATION
AND
OPERATION
II-l
INSTALLATION:
The
Stanton
Model
210B
Preamplifier
requires
no
special
installation
as
a
table
top
unit,
other
than
plugging
into
a
115
volt
AC
power
line.
For
panel
mounting
it
will
usually
be
necessary
to
unscrew
the
four
rubber
feet.
Note:
The
Model
210B
is
shipped
with
the
output
trans-
formers
factory
wired
for
600
ohm
isolated
outputs.
If
it
is
desired
to
use
the
150
ohm
outputs,
the
jumpers
must
be
changed
internally
on
the
printed
curcuit
boards
as
shown
below:
600
JL
/501"-
If
the
preamplifier
is
mounted
in
a
metal
cabinet,
there
is
the
possibility
of
additional
ground
loops
since
both
RCA
input
phono
jacks
are
grounded
to
the
chassis,
which
in
turn
is
grounded
tnrough
the
three
wire
AC
line
cord.
If
the
additional
chassis
ground
creates
(through
the
metal
cabinet)
an
undesireable
ground
loop,
simply
plug
in
the
AC
line
through
a
standard
NEMA
grounding
to
non-
grounding
adapter
plug.
II-2
OPERATION:
After
mounting
the
preamplifier
and
completing
the
desired
input
and
output
connections,
the
power
line
can
be
connected,
the
FLAT
or
NAB
response
selected
with
the
front
panel
switch,
and
the
front
panel
power
switch
turned
on.
The
POWER
ON
indicator
should
light
and
the
output
level
or
gain
of
the
individual
channels
can
now
be
adjusted.
The
LEVEL
(gain)
controls
are
effective
in
both
the
FLAT
and
NAB
response
positions,
while
the
HF-ADJ
controls
are
only
effective
in
the
NAB
position.
The
latter
controls
allow
the
high
frequency
roll-off
of
the
amplifiers
to
be
adjusted
for
more
or
less
roll-off
than
the
standard
NAB
record
reproducing
response.
II-l

11-2
OPERATION:
(con'd)
•
..
The
HF-ADJ
controls
can
be
set
by
either
of
two
methods.
The
first
method
is
to
feed
the
preamplifier
with
a
standard
signal
generator
and
then
adjust
the
frequency
response
to
the
NAB
curve
with
the
HF-ADJ
controls.
The
second
method
is
to
adjust
the
preamplifier
when
it
is
completely
wired
into
a
system
by
using
a
standard
test
record,
such
as
the
NAB
TEST
RECORD
(with
discrete
frequencies
recorded
in
accordance
with
the
March
1964
NAB
recording
standard).
This
allows
the
preamplifier
to
compensate
for
any
deficiencies
in
the
high
frequency
response
of
the
cartridge
or
other
system
components.
In
both
methods,
it
is
only
necessary
to
take
measure-
ments
at
two
frequencies
such
as
1
KHZ
and
10 KHZ,
i.e.,
the
gain
is
measured
first
at
1
KHZ
and
then
the
preamplifier
response
adjusten
at
10
KHZ
to
give
the
desired
difference
in
gain
at
these
two
frequencies
.
11-2

III.
CIRCUIT DESCRIPTION
AND
HAINTENANCE
111-1
CIRCUIT DESCRIPTION:
The
Stanton
Model
210B
Stereo
Preamplifier
consists
of
three
basic
modules,
i.e.,
a
dual
regulated
power
supply
and
two
identical
preamplifiers.
The
power
supply
is
shown
on
Sheet
2
of
the
schematic,
while
the
Preamplifier
is
shown
on
Sheet
1.
The
power
supply
consists
of
two
identical
regulated
supplies,
with
the
positive
output
of
one
supply
grounded
and
~he
negative
side
of
the
second
supply
grounded.
Each
supply
consists
of
a
transformer
isolated
full
wave
bridge
rectifier
(CRI-CR4)
and
a
capacitive
filter
(Cl),
followed
by
an
integrated
circuit
voltage
regulator
(Al).
The
high
frequency
regulation
is
further
improved
by
C3,
while
R2
and
R3
set
the
nominal
regulated
output
voltage.
R4
and
R5
are
used
as
output
voltage
trim
resistors
if
required.
Rl
sets
the
current
limiting.
Each
preamplifier
consists
basically
of
the
two
sections
of
a
low
noise
integrated
circuit
dual
operational
amplifier
(Al).
The
first
section
is
used
for
both
the
NAB
and
FL~T
response
amplification.
In
the
FLAT
position
of
Sl02,
R3
and
R6
control
the
voltage
gain
at
a
nominal
value
of
82,
while
R4, R5,
C3, C4,
and
C5
control
the
NAB
response
performance.
The
first
amplifier
section
is
followed
by
the
LEVEL
(gain)
control(R9)and
then
a
flat
response
power
amplifier
with
a
nominal
voltage
gain
of
7
controlled
by
Rll
and
R12.
The
integrated
circmit
amplifier
(Al)
drives
a
power
output
stage
consisting
of
Q2
and
Q3
connected
as
a
complementary-symmetry
emitter
follower
pair
with
biasing
provided
by
R14,
R15, R16,
and
Ql.
This
output
is
then
transformer
isolated
by
Tl.
111-2
MAINTENANCE:
The
modular
design
of
the
Hodel
210B
Stereo
Preamplifier
facilitates
servicing
and
troubleshooting
of
the
unit
should
any
problems
develop.
If
any
trouble
does
develop,
first
check
to
see
that
the
dual
power
supply
is
putting
out
both
+16
volts
DC
and
-16
volts
DC
with
respect
to
the
chassis
ground.
If
not,
remove
the
+
and
-
power
~.
leads
to
both
preamps
and
recheck
the
power
supply
out-
put
voltages.
If
the
supply
checks
out
by
itself,
re-
connect
one
preamp
at
a
time
to
isolate
the
faulty
unit.
..
On
the
other
hand,
if
the
supply
is
not
putting
out
the
proper
voltages,
a
comparision
of
the
+
and
-
supplies
will
determine
which
side
is
faulty,
since
both
supplies
are
identical.
After
locating
the
faulty
module,
standard
servicing
techniques
can
be
followed
using
the
schematics
and
parts
list
furnished.
111-1

111-2
MA1NTENA~CE:
(con'd)
Please
note
that
line
operated
ohmmeters
and
VTVM's
can
inject
larg~
line
voltage
spikes
into
the
circuit
being
tested.
Therefore,
use
particular
caution
in
measuring
the
various
integrated
circuits
in
the
pre-
amplifier
since
integrated
circuits
are
extremely
sensitive
to
this
type
of
voltage
spike
•
..
111-2

TABLE
OF
REPLACEABLE PARTS
Symbol
DescriEtion
F10l
SlOl
Sl02
Power
SUEEly
Al,
A2
Cl,
C4
C3,
C6
C2,
C5
CR1-CRS
Rl,
R6
R4,
5,
9,
10
R2,
R7
R3,
RB
Tl
AmElifier
Al
Cl,
10,
11
C2
C3,
6
C4
C5
C8,
13
C9
C12
C14,
15
C16
C17
Rl
R2,
5,
11
R3
R4
R6
R7,
17,
lS
·. RB,
15
R9
R10
R12
R13
R14
R16
01
02
03
Tl
~e,
3AG,
1/2
Amp.
Switch,
Rocker
Slide,
I11uminated
Switch,
Rocker
Slide,
Shorting
Integrated
circuit,
Fairchild
U9A7723393
Capacitor,
electrolytic,
470
UF,
35V
Capacitor,
electrolytic,
4.7
UF, 50V
ceramic,
100
PF,
lKV
Rectifier,
IN4002
Resistor,
carbon,
1/4W,
5%,
4.7
ohms.
select
at
test
film,
l/BW,
1%,
B.25K
7.15K
Transformer,
power,
Stanton
2100-4210
Integrated
circuit,
Fairchild
U6A7739393
Capacitor,
electrolytic,
4.7
UF, 50V
22 UF, 25V
film,
.0056UF,
200V
Mica,
820
PF,
500V
trimmer,
450-l390PF
ceramic,
.05
UF,
50V
.001
UF
lKV
Capacitor,
film,
.022
UF,
200V
.01
UF,
200V
electrolytic,
47
UF, -
l6V
ceramic,
25
PF,
lKV
Resistor,
carbon,
l/4W,
5%,
510
ohms
47 K
B2
K
film,
1/4W,
5%,
560
K
carbon,
1/4W,
5%,
l.OK
10
ohms
750
ohms
Resistor,
carbon,
variable,
100
K
1/4W,
5%,
150
K
300
K
33
ohms
2.7
K
33
K
Transistor,
siliL~n,
NPN,
2N4400
NPN,
Motorola
MPS-U-02
PNP,
Motorola
MPS-U-52
Transformer,
Output
Stanton
2100-4211

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2100-4510-0B
POWER
SUPPLY
MODULE
NOTES:
I. .jII:SELECTED IN
TEST.
2. UNLESS OTHERWISE SPECIFIED:
ALL RESISTORS ARE IN
OHMS,
1/4 WATT, SOlo ,
ALL
CAPACITORS ARE IN MICROFARADS·
....
L_
•.
_
...
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__
..
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SCHEMATIC-PROFESSIONA
PRE,
AMP.
. MODEL2IOB_

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,--
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1'-'4
R2
47K G
FREQ.
RESPONSE
SWITCH CONNECTION
C6
.005'
2fXJV'
R7
10
3
R3
82K
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C8
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50V
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C9
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50V
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IRI4
2.7K
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SOV
RIG
33K
AMPLIFIER
MODULE
NOTES •
·
1.
UNLESS OTHERWISE SPECIFIED:
ALL
RESISTORS
ARE
IN
OHMS
,
114
WATT SO/oJ
ALL
CAPACITORS
ARE IN
MICROFARADS.
(
TWO
MODULES
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FDR
PRE
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SCHEMATIC,
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AMP
MODEL
210B
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