Sparta ASC 305 B Manuale utente

www.SteamPoweredRadio.Com

[p~~LF~

ELECTRONIC

CDRPDRATIDN

MODEL

ASC

305 B

Stereo Control Center

TECHNICAL

MANUAL

5851

FLORIN-PERKINS

ROAD

/

SACRAMENTO,

CALIFORNIA

/

TELEX

377-488

CABLE

SPARTA

/

(916)

383

-

5353

A Division

of

Computer Equipment Corporation

www.SteamPoweredRadio.Com

TECHNICAL

MANUAL

MODEL

ASC

305 B

Stereo Control Center .

PROPRIETARY

NOTICE

Sparta Electronic

Corporation

proprietary

data

is

contained herein. Neither this

document

nor

the

information

contained herein shall be disclosed

to

others

for

manufacturing

or

any

other

purpose except

as

authorized in

writing

by

Sparta Electronic Corporation.

'

c1970 098-2150

$5.00

~

~[p~~lJ~

~

ELECTRONIC

CORPORATION

!5B51

FLORIN-PERKINS

ROAD

SACRAMENTO,

CALIFORNIA

95B28

A OI

VISIO

N

o,

CO

MP

UTER

EQUIP

MENT

CO

R

POR

ATION

. .

www.SteamPoweredRadio.Com

DESCRIPTION

ASC-305B

The

ASC-305B

Ste

r

eo

Studio

Control

and

Remote

Unit

consists

of

a

Stud

io

Cont

r

ol

Console

(cabinet)

two

twe

l

ve

-

inch

professiona

l

turn

t

ab

l

es

,

two

TEP-

3S

Stereo

Preamplifiers

,

an

MCA-1

monitor-amp

li

fie

r

and

the

AS-30B

Stereo

Audio

Console

.

CONSOLE

AS

-30B

The

AS

-30B

Console

may

be

used

separate

ly from

the

ASC-

305B

cabinet

by

simply

removing

the

quick

-

disconnect

connectors

from

the

rear

panel

. It

may

be

battery

-

operated

or

the

power

supply

may

be

easily

removed

also

from

the

ASC-305B.

PREA

MPLIFIERS

·--....,'-

Preamplifier

s

are

l

ocated

on

the

lower

sh

e

lf,

one

on

each

side

,

and

feature

separate

l

evel

controls

fo

r l

eft

and

right

channe

l

output.

These

are

preset

for

prope

r l

evel

but

may

be

changed

if

needed

for

new

or

different

cartridges

Additional

information,

plus

maintenance

data

is

i

ncluded

in

a l

ater

section

.

MONITOR AMP,

MCA-

1:

An

MCA

- 1

monitor

amp

is

a l

so

located

on

the

l

ower

shelf

near

t

he

operator's

knee

. A l

evel

switch

su

pp

li

es

either

Cue

or

Program

audio

to

the

monitor

s p

eaker

located

in

the

conso

le

ca

bi

ne

t.

Adequate

power

is

ava

il

ab

le

to

drive

an

a l

ternate

,

externa

l 8

ohm

speaker

if

desi

r

ed

.

Appropriate

schematics

are

included

wi

th

the

A

S-30B

schematics.

ASC-305B

~

Page

1

www.SteamPoweredRadio.Com

DESCRIPTION ASC-305B

(Cont'd)

TURNTABLES

The

ASC-305B

may

be

equipped

with

either

four-pole

or

synchronous

motor

driven

turntables.

Another

section

provides

additional

information.

TONE ARMS

The

ASC-305B

is

supplied

-

standard

with

SPARTA

ST-220

Professional

Stereo

tone

arms

and

are

designed

so

highly

accurate

adjustment

may

be

made

visually

for

optimum

overhand

and

tracking-force.

Other

tone-arm

options

are

available.

ASC-305B Page

2.

www.SteamPoweredRadio.Com

FEATURES

Portable

Cabinets:

Finish

.

..

.

..

.

.....

.

..

.

..

. .

...

..

...

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

.

..

. l\'alnut wood

grain

&

Dove

bonded

plastic

laminate

Unit

set-up

Dimensions

•••

••••

•• .

••

.

••••••

•

•••••••

•..

Overall,

including

legs

&

lift

l

eaf

extended

34"

high (

28"

to

work

surface)

51

1/2"

wide,

25

3/4"

deep.

Bench/Lid

Dimensions

.•

• .

.•

•

••••

••

••••••••

. .

•..•.••.

Legs

installed

16

1/2"

high,

49

1/2"

wide

, 19

1/2"

deep.

Closed

Case

Dimension

.•

•••.••

.•.•.•

•

.••••

.

•••

•

•••••

Bench/Lid

installed

14

1/2"

hi

gh

51

1/2"

wide,

19

1/2"

deep.

'

Shipping

Weight

.•••••••••.••

•

•.•••••••••

•

•••

• ••

••

.

>is,?

Pounds

AS-30I3

Console:

9

stereo

pairs

1

each

for

mixers

1

through

4 and 5

for

mixer

5.

Standard

equipment

of

the

AS

-30B

as

supplied

with

the

ASC-3058

includes

a

pair

of

microphone

preamplifiers

in

channel

1,

plus

stereo

equalized

phono

preamplifiers

for

inputs

to

channels

2 and 3.

TONE ARM

The

SPARTA Model

ST-220

Professiona

l

Stereo

Tone

Arm

reflects

the

high

quality

and

scientific

design

needed

for

the

superior

reproduction

of

phonograph

records.

It

permits

the

use

of

lower

tracking

forces

for

which

the

latest

cartridges

are

designed.

The

Tone

arms

can

be

precision

balanced

and

are

so

designed

that

a highly

accurate

adjustment

of

the

tracking

force

can

be

made

visually

.

Some

of

the

outstanding

features

are:

All

cartridges

can

be

adjusted

for

correct

overhang

to

insure

optimum

tracking

.

The

plug-in

head

assembly

is

rigidly

locked

in

place,

but

very

easily

removed

when

necessary.

Precision

ba

ll-

bearings

are

used

throughout

on

a

ll

pivot

surfaces.

ASC-305B Page

3.

www.SteamPoweredRadio.Com

\.

TECHNICAL

MANUAL

Model

GT-12

Professional

Turntable

PROPR

.

IET

ARY

NOTICE

Sparta

El

ec

troni

c

Corporation

proprietary

data

is

contained

herein.

Neither

this

docum

ent

nor

the

information

co

nt

ained herein shall be disclosed

to

others

for

manufacturing

or

any

other

purpose

exce

pt

as a

uthori

zed in

writin

g

by

Sparta Electronic

Corporation.

~

$~~~LI~

V

ELECTRONIC

CORPORATION

!5B!51

FLORIN

•

PERKINS

ROAD

SACRAMENTO,

CALIFORNIA

95828

A

OIVISION

OF

CO

MPUTER

EQUIPMENT

CbRPORATION

www.SteamPoweredRadio.Com

TOTAL

WEIGHT

OF

PLATIER

DIMENSIONS

BOTTOM CLEARANCE

TOP CLEARANCE

PLATIER

SIZE

SPEEDS

ACCELERATION

RUtvIDLE

WOW

AND

FLUTTER

F I

NISH

POWER

SPECIFICATIONS

1.

18

1/2

l

bs

6 l

bs

1

6"

Wi

de,

15 1

/2"

deep

5 1

/2"

GT-12

-4P

6 1

/2"

GT-

12-SY

2

1/4"

without

tone

arm

2

3/4"

with

ST

-220

1

2"

33 1

/3

and

45

rpm

Less

t

han

1/16

turn

at

33 1

/3

rpm

45

db

below

reference

l

evel

of

1.

4

centimeters

per

second

peak

ve

l

ocity

at

100

Hz,

measured

at

33

1/3

rpm

0

.1

%

or

better

SMOKE GRAY,

textured.

Burnt

orange

turntable

pad.

117

volts,

60Hz, 220

V

/50

Hz

available

GT-12-4P

65

Watts

,

GT-12-Sy

35

Watts.

www.SteamPoweredRadio.Com

INSTRUCTIONS

FOR

OPERATION

2 SPEED TRANSCRIPTION TURNTABLES

SPARTA

Turntables

are

shipped

completely

assembled.

Shipping

materials

such

as

blocks,

cardboard,

etc.,

should

be

removed

and

the

table

thorough

ly

checked

for

possible

damage

incurred

in

transit.

Connect

115V

60

cycle

AC

(unless

otherwise

ordered

or

specified)

only

to

terminals

marked

in

red.

INSTALLATION:

The

tab

le

should

be

solidly

mounted

to

operating

table

or

desk.

DO

NOT USE SPONGE RUBBER OR OTHER

RESILIENT

MATERIAL BETWEEN

TURNTABLE CHASSIS

AND

MOUNTING SURFACE!

This

is

especially

important

where

reproducer

arm

is

of

such

length

that

it

cannot

be

mounted

directly

on

the

turntable

chassis.

OPERATION

AND

ADJUSTMENTS:

Turntable

speed

is

c:ontrolled

by

3

factors:

(1)

speed

of

motor

in

RPM, (2)

diameter

of

motor

pulley

(capstan)

(3)

diameter

of

inside

rim

of

turntable.

Diameter

of

idler

has

no

effect

on

table

speed,

hence

no

speed

change

occurs

as

idler

wears.

Speed

change

is

made

by

placing

speed

change

arm

in

one

of

the

two

slots,

top

for

33-1/3,

and

bottom

for

45 RPM. A

"Neutral''

position

is

provided

between

the

slots,

and

when

not

in

use

the

shift

arm

should

be

left

in

neutral

position

to

prevent

"flats"

on

the

idler.

Both

of

the

slots

have

an

adjustable

stop

which

limits

the

travel

of

the

arm.

While a

slight

change

can

be

made

in

table

speed

by

adjusting

these

stops,

their

purpose

is

to

limit

the

pressure

between

motor

pulley-idler

and

table

rim.

INITIAL ADJUSTMENT IS

AS

FOLLOWS:

Screw

in

(clockwise)

(45 RPM)

screw

until

motor

ceases

to

drive

table,

then

back

out

screw

slowly

until

just

enough

pres~ure

is

applied

to

give

satisfactory

acceleration

.

Best

results

will

be

realized

by

using

the

least

possible

pressure

consistent

with

adequate

driving

power.

Too

much

pressure

will

cause

undue

wear

on

the

idler,

cause

incorrect

speed

and

induce

vibration.

LUBRICATION: MAIN TURNTABLE

SHAFT:

Main

turntable

shaft

should

be

wiped

clean

with

clean

lintless

cloth

and

bearing

well

should

be

cleaned

with

cloth

wrapped

around

wooden dowl

to

remove

gummy

deposits

of

dirt

and

oil.

Re

lubricate

by

applying

l

ubriplate

#3

Special

Product

Oil.

If

not

available

use

S.A.E

.

30

automot

i

ve

oil

. A

small

dab

of

Lubriplate

should

be

applied

to

the

ball

on

the

end

of

turntable

shaft

.

This

lubrication

procedure

should

be

followed

every

two

weeks

- -

every

week

if

table

is

used

in

a 24

hour

operation.

IDLER

BEARING LUBRICATIQ'\J:

The

idler

bearing

is

made

of

oilite;

a

material

consisting

of

small

bronze

particles

pressed

together

with

microscopic

passages

between

them.

These

passages

are

impregnated

with

oil.

This

bearing

material

contains

enough

oil

for

several

years

of

bearing

life.

Should

the

idler

tend

to

become

stiff

on

the

shaft

and

not

rotate

freely,

this

would

indicate

that

the

bearing

no

longer

has

sufficient

oil

for

lubrication

.

At

this

time

the

idler

should

be

removed,

the

shaft

and

bearing

wiped

thoroughly

with

a

clean

lintless

cloth

and

the

bearing

relubricated

with

a

light

oil

_

such

as

3

in

1

oil.

www.SteamPoweredRadio.Com

Page 2

BODINE

SYNCHRONOUS MOTOR:

This

motor

is

equipped

with

oil

cups

located

on

the

side

of

top

and

bottom

bearing

.

The

bearings

on

these

are

of

the

solid

bronze

sleeve

type,

equipped

with

a

felt

wick

to

carry

oil

to

the

shaft.

Ordinary

lubrication

at

two

month

intervals

with

a

couple

of

drop

s

of

oil

per

bearing

is

sufficient

.

Grade

#10

non-

detergent

oil

is

recommended.

UNIVERSAL

ELECTRIC

FOUR POLE MOTOR:

This

motor

comes

equipped

with

oilite

bearings

and

ordinarily

needs

no

lubrication

attention

during

its

life.

If

the

turntable

is

located

in

an

unusually

hot

loc

ation

it

is

possible

for

the

oil

in

these

bearings

to

change

viscosity

to

the

point

where

the

motor

shafts

will

be

so

stiff

that

th

e

motor

will

have

trouble

starting

.

Under

these

conditions,

the

motor

should

be

removed

from

th

e

turntable,

disassembled,

and

the

bearing

and

shaft

cleaned

.

The

be

aring

then

should

be

thorou

ghly

saturated

with

a

light

oil

such

as

3

in

1.

The

motor

then

can

be

reassembled,

reinstalled

on table and

table

restored

to

further

u

sage

.

IDLER ADJUSTMENTS:

Note

that

the

motor

is

attached

to

its

hanger

with

screws

or

bolts

through el

ongated

ho

l

es

.

If,

due

to

wear,

(r

eduction

of

diameter)

of

the

idl

e

r,

it

becomes

impossible

to

secure

adequate

driving

power

with

the

shift

arm

at

the

extreme

l

eft

hand

end

of

the

speed

selector

slot,

moving

the

motor

toward

the

rim

of

the

table

will

give

correct

driving

pressure

more

toward

the

center

of

the

speed

change

slot.

If

a new

idler

makes

it

impossible

to

obtain

a

"n

e

utr

al

",

the

motor

is

simply

moved

away

from

the

table

rim

until

a

suitable

arm

position

in

the

slot

is

obtained.

IDLER

DRIVING SURFACE:

It

is

extremely

important

that

the

driving

surface

of

the

idl

er

and

the

inside

rim

of

the

turntable

be

kept

clean

of

oil

or

other

contaminating

substances.

During

the

first

few

weeks

of

operation,

the

idler

driving

surface

and

the

in

side

rim

of

the

table

should

be

cleaned

with

methy

l

alcoho

l

at

weekly

intervals.

No

further

attention

should

be

needed

unless

these

areas

are

subject

to

oil

overflow

from

the

idler

due

to

over-lubrication.

If

the

idler

or

table

rim

becomes

contaminated

with

oil,

the

only

satisfactory

solution

is

to

cl

ean

the

table

and

idler

thoroughly

with

hot

water

and

deterg

ent

. .

NOISE, HUM, RUMBLE: Many

pickups

are

subject

to

hum

caused

by

the

magnetic

field

of

a

motor.

Before

in

stalling

pickup

arm

on

tabl

e,

it

is

wise

to

move

the

pickup

head

to

variou

s

lo

cations

on

the

platter,

with

the

motor

operating

but

w~th

the

idler

in

"neutral".

This

should

help

in

loc

ating

the

mounting

position

of

the

arm

which

will

cause

the

least

hum.

Noise

is

divid

ed

into

two

classes,

mechanical

and

electrical.

Noise

that

can

be

h

eard

w

ithout

amplifier

or

pickup

in

·operation,

can

u

sually

be

tr

aced

to

its

source

by

comparing

the

noise

with

the

speed

of

the

motor,

idler

or

table

itself.

If

noi

se

is

constant

at

all

speeds

it

probably

originates

in

the

motor.

If

it

increases

with

table

speed

,

but

its

frequency

is

greater

than

table

spee

d,

it

can

usually

be

traced

to

the

idl

er.

If

the

noise

varies

with

table

speed

and

has

the

same

frequency,

look

for

something

on

th

e

table

rim,

such

as

oil,

dirt

or

possibly

a

crack

in

the

table

casting.

In

the

case

of

noise

traced

to

the

idler,

look

for

dirt

on

idl

er

driving

surface,

pits,

or

foreign

material

imbedded

in

idler

driving

surface.

Check

felt

thrust

bearing

under

idler

to

be

sure

id(e.r

is

not

riding

directly

on

metal

boss

at

bottom

of

idler

shaft.

Too

much

idler

tensiori

can

cause

idl

er

to

ri

se

on

its

shaft

and

noise

is

heard

as

the

idler

contacts

the

idl

er

re~ining

ring.

•

..

www.SteamPoweredRadio.Com

,_

Page 3

Rumble

more

or

l

ess

constant

at

all

table

speeds

can

usually

be

traced

to

the

capstan.

Again,

too much

idler

tension

will

aggravate

rumbe

caused

by

an

out

of

round

or

wobbly

condition

in

the

capstan,

(motor

pulley).

Noise

caused

by

"flarn"

in

the

idler

will

run

out

in

a few

minutes

because

of

the

"self-healing"

nature

of

the

neoprene

used

in

the

idlers.

Put

table

in

45 RPM

position

and

let

run

for

a few

minutes.

SPARTA ELECTRONIC CORPORATION

will

be

glad

to

assist

in

any

problems

in

connection

with

operation

or

maintenance

of

the

tables

.

To

insure

a

minimum

of

delay,

please

give

as

much

information

as

possible

in

connection

with

the

problem,

such

as

serial

number

of

table,

date

purchased,

whether

problem

is

new

or

of

lo

ng

standing,

type

of

pickup

and

arm

used,

whether

problem

is

different

at

different

table

speeds,

whether

it

is

only

in

evidence

when

idler

is

driving

table,

etc.

The

more

information

supplied,

the

easier

it

will

be

to

provide

suggestions

to

eliminate

the

difficulty.

IMPORTANT

There

are

aluminum

shipping

tabs

installed

between

the

motor

hanger

and

turntable

frame

to

protect

the

rubber

motor

mounts

during

shipment.

THESE BLOCKS MUST

BE

RE

MOVED

BE

FORE OPERATION

Each

block

is

secured

in

place

by a

10/24

by l

3/4

"

screw

with

a

red

painted

head.

(The

shipping

blocks

should

be

retained

for

i

nstallation

in

case

of

future

ship-

ment

of

turntables,

or

to

secure

during

moving.

)

SPARTA ELECTRONIC CORPORATION

5851 Fl

orin-Perkins

Road

Sacramento,

California

95828

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