Stanton 310 User manual

I

I Instruction

Manual

I

MODEL

310

I

.Professional Stereo Phono

• Preamplifier

I

STANTON

MAGNETICS

INCORPORATED,

TERMINAL

DRIVE,

PLAINVIEW,

NEW

YORK

11803

r

INSTRualON

MANUAL

FOR

STANTON

STEREO

PHONO

PREAMPLIFIER

MODEL

310

(

I

Contents Page

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

" Performonce Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

III

Installation Instructions

.........

.

................

.

.........

2

IV

Electrical Connections

and

Adjustments . . . . . . . . . . . . . . . . . . . . . . . .

.3

V Troubleshooting

and

SeNicing

..............................

5,

VI

Recording

and

Playbac/~

RIM

G

NAG

CUNes

. . . . . . . . . . . . . . . . . .

..

6

VII

ParTS

List

and Circuit Diagram

...............................

8

[

General

Description

Stanton

phono

preamplifier

model

.310 was designed for professional

appl

ications, to provide correct interface for all

magnet

iC

phono

p

i

C/~ups

and

to provide all the necessary controls

and

their functions.

The

.310 preamplifier features:

0 ) adjustable gain from

.30

-

60

db

b) instant selection

of

flat or

NAG

frequency response

c) switchable

rumble

filter

d) cartridge, capacitive

load

selector switch.

e)

HF

response equalization trimming

f) universal

bracl~et

mounting

g) selection for

11

OV

60HZ or

220V

50HZ operation

h) input

RF

filtering.

The

Stanton.31 0

preamplifier

was designedaroundthe latest

low

noise,high

output

low

distortion

int~grated

circuits

deve

l

oped

specifically for

audio

applications. A regulated

power

supply

assures

the stability

of

operation

required for the most

demanding

applications

and

extreme

line

voltage

fluctuations.An aeriverumblefilter offerssharpcutoff

of

low

frequencies

below

.30

Hz.

The

gain

of

the preamplifier

is

controlled

by

varying the

amount

of

negative

feedbac/~

in

the

output

section.

HF

response trim

is

accomplished

by

adjusting the capacitance

in

the

feedbac/~

loop

of

the

first

amplifier stage.

Propercartridge

loading

is

achieved

by

inserting therequired fixed capacitors

across

the preamplifier input using a miniature

dip

selector switch accessible

through on

opening

in the

bac/~

panel.

The

LED

pilorlight

is

in

series with the

power

supplyoutputandshows

when

the

power

is

turned on,

and

changes brightness

when

the

amplifier

demands

additional current

while

processing large

audio

signals.

The

single

PC

board

construction

of

the preamplifier

assures

uniformity

between

units, eosy inspection,

maintenance

,

and

if

needed

seNicing.

All

IC

devices are

socl~et

mounted

and

are

easily accessible.

All

electronic

compo

-

nents

except

the

power

transformer are

commonly

available

values

and

types for ease

in

seNicing.

Selection

of

the

power

line

voltage

is

done

through internal stroppi

ng

of

the

power

transformerpri

mary

windings

or

on later

models

by

a

voltage

selector

switch accessible through the

opening

in

the back panel.

Performance Specificati

ons

OUTPUT

+

20

dGm

Maximum

FREQUENCY

RESPONSE

Ys

dG

from

20

Hz-

20Khz

in

FLAT

or

NAG

positions

of

Mode

Selector

1

DISTORTION

THD

:j:

0.

05

% @

20

d[3m

OUTPUT

SOURCE

IMPEDANCE

It

is

recommended

thor capacitive load selection

be

mode

beforearraching

5 Ohms, Designed for loads

150

Ohms the

preamp

permanenrly

to the enclosure,since itwill

be

less

convenienr to

or Higher

GAIN accomplish

th

isadjustment larer

Adjustable

30

.

60

d[3

RUMBLE

FILTER

3d[3

Knee @ 28Hz (See curve

page

-35d[3 @ 5Hz IV Electrical Connections

and

Adjustments

MAXIMUM

INPUT

LEVEL

@ 1

KHz

120

mV

1) The Power Line:

The

Stanton

310

preamp

can

be

set to

operate

from

NOISE

(Input Terminored

by

-70

dG

or

belier

mef

10m

V input either

11

OVor220VIinesor

50

/

60

HzAC.

Gefore connecring the

unitto

theAC

Carrridge) @ 1

Khz

NAI3

curve,

44

DG

Voltage mains,checl, the morl,ings

in

the bock

of

the unitnexttorhe line cord to match

gain). -74

dG

or

belier

with Rumble

power

linevoltage. or

set

the

110-220

line

voltage

selecror switch for proper

Filter

in

Voltage.

INPUT

RESISTANCE

47K

ohms 2)

Audio

Input: Inputs to the preamplifier are through the 2

phone

jacl,s

INPUT

CAPACITANCE

15

pF

, SWitchable in

50

pF

steps to

350

available

in

the bock.

The

ground wire from the turntable should

be

pF

Maximum

. cannecred to the cenrerterminal

of

thebarrier

strip

,morl,edGND.lf

hum

exists

CHANNEL

SEPARATION

60

d[3

Minimum

(

20

Hz-iS

I,Hz) in the system

run

a separate ground wire from the cenrer terminal to the

INPUT

CONNEGORS

RCA

Phono

Jacl,s

ground

of

the system amplifier.

OUTPUT

CONNEGOR 5 T

eflllinal

[3arrier

Strip

POWEr.

REQUIREMENTS

3)

Preamp Output:

Output

of

the preamplifier

is

available

onfour terminals

Can

be

switched or stropped for

100

-

of

the barrier strip

os

marl,ed. Observe correct polariry

in

order to preserve

125

VAC,

or

200

-

240

VAC,

50

-

60

Hz

, properphose relationship berween channels

and

correctgroundings.Reversed

5 Walis

Maximum

INDICATORS

wires

in

unbalanced systems

may

result

in

shorred output

and

no

signal.

LED

Pilot

light

UNIT

DIMENSIONS

4)

Ground Loops:

In

order to prevenr ground loops, observe carefully rhat

2-1/4

" x

5"

x

7-1

/4"

(5

7

mm

x

127

mm

x

184

mm).

J grounding

of

several pieces

of

equipment

be

done

at

one

place. Avoid

parallel ground paths

and

separate

low

level signals from

power

grounds.

"'

Installation 5) Gain Adjustment

CAUTION Connect the Turntable with the

magnetic

carrridge to

be

used to the input

jacl~.

Connecra suitable

AC

voltmeter

or

VU

meter

across

theoutputterminals

The

Stanron

310

preamp

should

be

installedwithin the reach

of

the tone

arm

of

the

preamp

and

rurn the

power

on.

Playa

test record which

hos

a 1

I,Hz

cables supplied

With

the turnrable or extension cables, permirred

by

the reference signal

at

I,nownvelociry representing the

overage

recorded levels

carrridge design,with total capaciry

being

equal

to or

less

than the carrridge

manufacrurer's

recommended

value. J found on records (

about

3.8 cm/sec).

Using

a small screw driverset rhe

output

as

read on the

VU

meter

to

zero

d[3

by

turning multiturn

pot

marl,ed

"Level "

The

310

preamp

is

not

sensitive to

AC

or

RF

fields, because it has

no

audio

Adjust" for each channel separately. Keep

mode

switch

in

NA[3

position.

transformers,

and

because it has full

metal

enclosure.

However

in folloWing Perform the

some

adjustmentwith borhchannels to achieveperfectbalance

good

engineering

pracrices, refrain from positioning the

preamp

berween

channels.

power

transformers, high currenr

AC

cables or sources

of

hear

. Also it

is

not

6)

Adjustment of the Capacitive Pickup Loading

advisoble

to

mount

the unit with switch

and

connector openings facing

In

order to establish carrect capacitive

load

for the

magnetic

carrridge, total

upward

which allows dust to accumulare

and

selile inro the

slors

and

conracr

areas. capacitance

of

the

tone

arm

wiring

and

extension cables must

be

I,nown.

This

measuremenrcan

be

mode

only

when

the carrridge

is

disconnecred from the

The

rwo bracl,ets

provided

With

the

310

preamp

, can

be

arrached

in

many

tone

arm

and

the

extension

cables

are

unplugged

or disconnected

different

ways

allowing

unit to

be

mounted

under

the

table

,on the sidewalls from the

preamplifier

inputs.

The

combined

capacitance

of

the tone

arm

and

-verrically,from the

bacl~

,

or from the

front

[3y

adding

side panels the

310

can cables should

be

lower

or

at

least equal to the capacitive

load

specified

by

be

racl,

mounted

.

.J

the carrridge manufacrurer.

2 1 3

The

difference beTWeen the specified capacitance

and

the measured

capacitance

is

mode

up

by

SVlitching

the

necessary capacitors inro

the

circuit

using the

SVlitch

accessible through the

bacl~

panel

adjacen

t to the

phano

input

jacl~s

.

(When the

number

of

the

SVlitch

lever

is

vis

i

ble

through the r

ear

access

hole

the

SVlitch

is

in

the "

Out

" or

no

copacitance position).P-econnea

both

cables

and

artach the carrridge

to

the tone

arm

.

7)

Frequency Response Adjustments

Frequency response adjustments can

be

mode

at

high frequencies

where

deViations

due

to

loading

, carrridge construaian, temperarure

and

test

records

normally

occur.

It is strongly advised

that

all adjustmenrs

be

performed

in

on

area

where

temperature

stays fairlyconstanr

near

20°

Car

68°

F.

Equipmentand

t

he

test

records should

be

normalized

at

this

temperature

for

at

least

20

hours

before

adjustmenrs are

mode.

Always

work

withfresh test records

and

I~now

their

exaa

calibration

so

that

any

deviations from standard response

due

to

the

inaccuracies in curting can

be

accounted

and

compensated for.

All high frequency adjustments must

be

mode

in the

NAG

pOSition

of

the

mode

SVlitch

where

HF

trimmers are

operative

.

First

ploy

1 kHz signal for

reference

and

note

the

output

level. Then

ploy

, starting with

10kHz

, all

frequencies

up

to

20

I~Hz

and

write

down

the

output

levels.Adjust

HF

trimmers

to achieve the ftatest high frequency level in

both

channels.

When using test recards which

do

not

have

on

NAG

standard recording

response

but

are

cut ar constantvelocity,

follow

NAG

or

P-IAA

playbacl~

curve

for refere('lce levels

at

high frequencies.

The

low

frequency response

of

the cartridge

depends

entirely

on

the

matching

of

the

tone

arm

moss

and

the

carrridge

compliance

.If

the

tone

arm

is

very light

and

compliance

of

the carrridge

low

, the resonant frequency

of

the

tone

arm

-cortridge

combinotion

may

move

into the

20

Hz

region,

affeaing

sound

quolity

. Massive

tone

arms

when

used with very high

compliance

cartridges

have

problems tracking

warped

records

when

the

resonont frequency

is

shifted

well

below

the

7-10

Hz

region.

It

is

generolly

desirable to mainrain the stylus-arm resonance beTWeen 7-15

Hz

.

v Troubleshooting

and

Service

Disassembly

CAUTION:

Only

technically

competent

and

authorized personnel should

service

this

unit. Never

artempt

to

remove

or loosen

any

screws

on

the

unitwith

power

cord

conneaed

to

t

he

line. Disconnea

power

cord from line.

To

remove

the

preamplifier

chcissis

from

the

cover housing

remove

4 screws

from

the

bortom

of

the unit

located

feet

,then slide

the

unit

toward

the

front. (

On

earlyunits the

TWO

rear

panel

mounting

screws must also

be

removed

to

allow

the

panel

to

be

shifted to clear the brocket

mounring

nurs

).

4

III

1

.1

1

j I j

J

Troubleshooting

Design

of

theStanron J

10

preamplifieroffers

good

reliability

wit

hcomponenrs

that

operate

with

ample

safety margins. However ar times

replacement

of

wornor

ag

in

g components

may

become

necessary.P-emoval

of

resistors

and

copacitors sho

ul

d

be

aVOided

unless

exact replacement

is

on

hand.

Assembly techniques used

on

the J10

PC

board

for purposes

of

reliability

do

not

allow

indiscriminate unsoldering

of

components.

P-es

i

stors

and

capacitor

leadsshould

be

clipped for removal. Integrared

ci

r

cu

i

rs

are easily unplugg

ed

and

replaced.However,

before

removing any

of

the

ICs

,

note

position

of

the

orienration

dot

in

the IC

Defeaive

ICs

are to

be

replaced only wi

th

the

identical replacement parts.

Special componenrs, or components not readily

available

locally, can

be

obtained

from Stanron

Magnet

ics.

For

specif

ic

items refer to the ports

list

on

page

8.

Troubleshooting Chart

Power Supply Sympton

Cure

LED

does notlight but P-eplace

LED

Nore:

Goth

omplifier

Ie's

must

be

operating

to

draw

enough

preamp

operative current

to

light the

LED

.

LIDoff-

Unit

inoperative P-eplace

fuse

,

checl~

on-

off

switch,

checl~

power

transformer, primary

and

line

voltage

selector

SWitch

.

LED

lights-Preamp not

Checl~

DC

supply Voltages.

worl~ing

DC

voltag

es

aftervol- Check for

shorts

on positive

su

pply

tage

regular

IC

-

:3

are line.

low

or unmeasurable Check

voltage

regulator

IC

P-eplace

if necessary.

DC

voltages are very Some

high.

Hum too high.

Checl~

filter capacitor C17. C18,

C5

checl~

Ie

A:3

checksystem grounding

Amplifier

Signal Signal

at

the output

is

Checl~

DC

voltages

checl~

inputsignal

~

Measure- distared.

f<umbleSlNitdl

level and distortion.

ments

in

"In" position.

Mode

Checl~

grounding.

Lool~

at

the

wove

selector

SW

,in

NAG

or form with on oscilloscope at the

flat position. output

of

IC-A

1 on terminals 10

and

12.

Push

rumble

sw

i

tch

to outposition,

check signal or the emitter

of

Q2

.

Checl~

the output

of

IC-A2

terminals

10

and 12.

Te

st

voltage

levels

ore

listed on the

unit

sch

ematic.

5

TAOLE

I C

HAkA

GTE

RIS

TI

C5

FCR

FINE

GROOVE

DISK

REGORDS

RIAA -

NAO

DISC

P.ecarding and

P.eprad

u

CTing

charaCTer

is

ri

cs

Clau

sesD1J and

E.3

Recording

relative

level

Frequency

(dB) (Hz (cI

s»

-19.3

-18.6

-17.8

-

170

-16.1

-15.3

-14.5

-13.1

-12.4

-

11

.6

-10.2

- 8.3

6.7

5.5

3.8

2.6

- 1.9

1.2

0.7

0

+ 1.4

+ 2.6

+ 4.7

+ 6.6

+ 8.2

+ 9.6

+ 10.7

+

11

.9

+ 12.9

+ 1- .7-

+ 15.3

+ 16.6

+17.2

+17.7

+ 18.7

+ 19.6

20

30

40

50

60

70

80

100

110

125

150

200

250

300

400

500

600

700

800

1000

1500

2000

3000

4000

5000

6000

7000

8000

9000

10000

12000

14000

15000

16000

18000

20000

6

Reproducing

relative level

(dB)

+ 19.3

+18.6

+ 17.8

+170

+ 16.1

+ 15.3

+ 14.5

+ 13 1

+ 12.4

+

11

.6

+ 10.2

+ 8.3

+ 6.7

+

55

+ 3.8

+ 2.6

+ 1.9

+ 1.2

+ 0.7

0

1.4

2.6

4.7

6.6

8.2

9.6

-10.7

-11.9

-12.9

-13.7

-15.3

-16.6

-

17

.2

-17.7

-18.7

-19.6

:I

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10

20

30

50

100

500

F

re

quency

in

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: J

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S'i'l\j;TOtl

31

0 FJU:QUI:HCY R

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TCHeD

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I\ND OUT .

..

7

TABLE

OF

REPLACEAOLE

PARTS

PRE-AMP

MODEL

J

10

SY

MBOL

A1

, A2

A3

C1

,

C2

C3

,

C4

C5

, 6,

13

,

16

0 , 8,9, 10

C11

, 12

C14, 15

C17

C18

C21

, 22,

23

C24

,

25

C26

C27

C28

C29,

30

,

31

,

32

,

30,34

C35, C36

07

, C38

C39, C40

C41

, C42

CP.1

, 2, 3, 4

CR5

F1

Q1,Q2

R1,2,3

, 4

R5,R6

R7

, 8, 9, 10,

38,39

R

11

mru

R20,

R41

, R42

R21

, R22

R23, R24

R25, R26

R27

R28, R29

R30,

RJ1

R32, RJ3

RJ4, RJ5

R36

RJ7

R40

R4J, R44

S1

,

52

,

S3

S4

S5

T1

DESCRIPTI

ON

Im

e

grated

Ci

r

cuit,

Type NE553JN

Imegrored Circuit,Type UA72JCN

Capacitor, Elecrralyric

22UF

, 50V

Capacitor. Elearalyric

47UF

, 16V

CapaCitor, Elearolyric

nUF

, 16V

Capacitor, Elearalyric

10UF

,

25V

Capacitor, Elearolyric

47UF

, 50V

CapacitOr, Elearolyric 100UF,

35V

Capacitor. Elearolyric 470UF,

50V

Capacitor,

EleCTrolyric

22UF

,

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100PF

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UF,

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780

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820PF,

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6JV

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T

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2N6428

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Stanton 310 User manual

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