Stanton 210 B Installation And Operating Instructions 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

.

.,

.

LEFT

INPUT~

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,

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MODULE

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(RIGHT

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PRE

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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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RESPONSE

SWITCH CONNECTION

C6

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R3

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MODULE

NOTES •

·

1.

UNLESS OTHERWISE SPECIFIED:
ALL

RESISTORS

ARE

IN

OHMS

,

114

WATT SO/oJ

ALL

CAPACITORS

ARE IN

MICROFARADS.

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TWO

MODULES

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MODEL

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