Altec Lansing 9473A User manual

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SPECIFICATIONS

Type:

Scan

Frequency

Response:

ower

Output:

Distortion:

Noise

Level:

Source

Impedance:

Load

Impedance:

Maximum

Compression:

Atteck

Time:

Release

Time:

Threshold:

Compression

ratio:

Controls:

Power

Syoply:

Dimensions:

Color:

Weight:

ALTEL

LANSING:

Bidar,

Ghee

arog

Pak

nome

alee

pee

;

rear

LANSING.

OPERATING

INSTRUCTIONS

abot

Figure

9473A

Limiter

Amplifier

Limiter

Amplifier

20~

20,000

+24

dBm

maximum

output

level

Less

than

compression

KHz

(Typical

0.5%)

below

rated

oviput

150

©:

600

ohms

150

690

ohms

C.4

sec.

above

250

Hz,

3.6sec.

below

250

C.4

sec.

Single

Band

3.6

sec.

Single

Band

Dia.

Releose

function

con-

trolling

freauency

+15

dbmwith

output

level

contro!

maximum

Selectable

4:3,

12:1,

20:1

INPUT

Level

Corirol,

step

at-

tenvater

dB/step

OUTPUT

Level

Controf,

steo

at-

terivator

d8/

step

Dual

Band

Dual

Release

Single

Band

Dual

Release

Single

Band

0.4

sec.

Release

Single

Bond

3.6

sec.

Release

Compression

Ratio

interlocked

20:1,

12:1,

4:1

POWER

SWITCH

120/240V

50/60

watts

5-1/4"

19"

7-3/16"

ALTEC

Greer.

pounds

1515

Manchester

Ave.,

Anaheim,

Calif.

$2803

DESCRIPTION

The

ALTEC

9473A

Limiter

Amplitier,

designed

primarily

for

re-

cording

studios,

cherocterizes

the

concapt

spectral

sepera-

tion,

through

the

technique

Internal

crossover

network.

The

classical

problems

envelope

distortion

cavied

120

short

release

timeand

lossaf

program

followings

nign

energy

peak

when

release

t'me

too

long

ore

eliminated.

soiid-

state,

100%

silicon

transistor

amplifier,

the

ALTEC

9473A,

separates

the

incoming

progrom

materia!

into

two

bands,

eect

band

controlled

separcie

limite:

circuit.

The

distortior

floure,

allowable

the

lowest

frequency

the’

bend

deter

mines

the

release

time,

from

250

0.4

seconds,

are

below

250

3.6

seconds.

The

ALTEC

94724

Limiter

Am-=

plifier

utilizes

‘wo

‘ront

panel

meters

indicate

com-

pression

within

the

respective

frequency spectrum,

The

usa

insulated

gare

Field

Effect

Transistor,

provides

instantaneous

attack

with

thump

oversmoot.

The

Qual

Band

Dual

Release

position

operates

each

tana

separateiy,

compression

one

band

no:

aifecting

the

other.

The

Single

Band

Dual

Release

position

contral

volteges

ore

sleved

together,

with

the

largest

signa!

cantroiling

both

sides.

this

mode,

the

ALTEC

94734

standard

wideband

com-

pressor

with

the

added

advantage

allowing

the

release

time

vary

fron:

0.4

seconds

3.6

seconds,

function

the

frequency

the

largest

signal

presen}.

Forexample,

high

frequency

passages

may

severely

compressed

peaks

with

rapid

release

thus

eliminating

prolonged

toss

audio,

wile

low

Frequency

passages

are

released

slowly

eliminate

envelope

distortion.

Two

ALTEC

94734

Limiter:

provide

stereo

control

a'l

modes

operation

for

both

highand

!ow

frequency

bunds,

via

'ste-eo

inferconrect’

jocks

the

rear

penel.

When

connecred

to”

stereo

operation,

compression

either

ALTEC

94734

Limiter.

Specifications

and

componente

subject

change

without

notice.

Overal!

yerfearmance

will

maintained

improved.

42-02-04

1697~02

Price

56.21

will

dausea

carresponding

degree

compression

the

other,

thereby

maintaining

channel

gain

baience.

Wel

positioned

controls

provide

unobstructed

vision

for

ease

operation,

and

hinged

front

panel

facilitates

servicing.

INSTALLATION

Tne

ALTEC

9473A

Limiter

Amolifier

will

flush

mount

into

any

standard

19"

reck

orcabinet

rackand

requiresenly

three

verti-

cat

mourting

spaces

(5-1/4")

and

7-3/16"

deep.

screw

type

terminalblock

provided

the

rear

the

chassts

for

input

ond

output

connections.

Stereo

control

all

moces

eperction

for

high

ena

low

frequency

bandsare

provided

via

the

stereo

interconnect

jacks

also

the

rear

the

chassis.

Terminels

and

located

the

input

side

the

ter-

minal

strip

provide

sroper

termination

fer

150

600

chm

driving

source.

Strapping

combinations

ond

input

connections

are

dia-

grammed

Figure

Termincts

and

the

output

terminal

strip

are

for

vads

150

600

ohms.

Proper

stracping

combinations

and

output

connections

are

diagrammed

Figure

Rear

View

9473A

Limiter

Amplifier

APPLICATION

The

ALTEC

9473A

Limiter

Amplifier

intended

foruse

auto-

matic

level

control

applicctions

fulfilling

the

requirements

professional

broadcast,

recordingand

motion

picture

industries.

Figures

and

illustrate

twe

several

system

arrangements

Figure

iflustrotes

the

use

the

9473A

Limiter

Amplifier

controlling

peak

levels

from

live

recording

microphones

typical

recording

studio

application,

eliminating

system

over-

drive

the

tape

recording

urit.

Figure

Ulustrates

the

S473A

Limiter

Amolifier

used

ina

typi-

cal

broadcast

studio

application

peak

limit

the

signal

frem

the

program

mixing

console

prior

distribution

the

trans-

mitter

moduistor.

This

allows

the

station

operate

with

high

modulation

efficiency

while

preventing

over

nodulation.

The

9473A

Limiter

Amplifier

provides

output

+24

dBm

for

driving

remote

lines

the

modulator.

OPERATION

AND

USE

CONTROLS

The

input

level

control

used

adiust

degrees

limiting

with

varying

input

levels.

With

the

control

the

fuily

clockwise

position

(0),

limiting

takes

ploce

with

input

-35.

The

input

level

required

reach

limiting

threshold

increases

for

every

counterclockwise

position

the

input

level

control

maximum

dB,

f.e.;

input

dBm.

The

output

level

control

adjusts

the

ourput

from

the

Iimiter

over

range.

With

theautput

level

contro!

set

fully

clockwise

(0},

input

signa!

causing

threshoid,

produces

output

+15dBm.

This

output

may

bereduced

per

counterclockwise

step

the

output

level

cortro!

for

maximum

dB,

j.e.;

~25

dBm

output

threshold

COMPRESSION

AND

RATIO

CONTROLS

The

20:1,

12:1

and

4:1

compression

ratio

controls

are

used

change

the

transfer

slope

the

limiter

above

limiting

‘hreshold

the

20:1

sosition

increase

the

input

level

above

threshoid

causes

only

increase

the

output.

The

slope

12:1

4:1

the

other

two

positions,

respectively

weno

imam

Los:

Figure

Input

ond

Output

Stragpings

SINGLE

AND

DUAL

BAND

RELEASE

FUNCTIONS

the

Duel

Band,

Dual

Release

position,

the

limiter

operates

oneack

band

seperctely,

compression

cne

band

nor

cffecting

the

other.

the

Single

Band,

Dual

Release

position,

the

control

vo!tages

oresiaved

together

with

the

largest

signal

contralling

both

sides

this

mode

the

limiter

astandard

wideband

compressor

with

release

time

varying

from

0.4

seconds

3.6

seconds,

function

the

frequency

the

largest

signal

present.

the

Single

Band

0.4

second

release

Single

Band

3.¢

release

positions

the

limiter

operates

standard

wideband

limiter,

with

release

time

0.4

seconds

3.4seconds,

respec?

vely.

CALIBRATION

PROCEDURE

See

Figure

for

location

conirols

and

sirec

tion

rota-

tion,

Thesrrows

indicate

rhe

direction

rotation

toward

meximum

eack

control.

Set

HIGH

ond

LOW

BAND

LINEARITY

controis

their

MIN.

positions.

Set

RIGH

and

LOW

BAND

SENSITIVITY

controls

their

MID.

positions.

Set

RIGH

ond

LOW

BAND

THRESHOLD

controls

tneir

MIN.

positions.

Set

INPUT

level

control

"0".

Set

CUTPUT

level

control

"12".

Push

the

12:

COMPRESSION

RATIO

selector

switch.

Simu!tonecusly

press

the

DUAL

BAND

DUAL

RELEASE

and

SINGLE

BAND

0.4

SEC

RELEASE

buttons,

thereby

locking

both

down.

Jumper

point

(See

Figure

for

iocation).

94794

LIMITER

AMPLIFIER

{

Gees

Figure

Typical

Recording

Studio

Application

Apply

117V

power

the

unit

and

press

the

POWER

switch

"ON".

10.

Apply

KHz

input

signal

-36

dBm

the

input

termi-

nals.

11.

While

observing

the

output

the

oscilloscope,

increase

the

HIGH

BAND

LINEARITY

contro!

toward

maximum

until

the

output

wave

form

just

starts

decrease.

Any

further

increase

would

cause

definite

raduction

the

level

the

output

wave

form.

Repeat

Step

11,

but

this

time

adjust

the

LOW

BAND

LINE~

ARITY

control

for

the

start

wave

form

amplitudereduc-

hion.

With

the

-36

d8m

signal

still

applied

the

input

termi-

nals,

increase

both

the

HIGH

BAND

and

LOW

BAND

THRESHOLD

adjustments

until

thelr

respective

meters

jus!

start

indicate

the

left.

The

reaction

this

adjust-

ment

may

slow

and

overshoot

common.

overshoot

results

and

the

meters

peg

the

left,

slowly

back

the

threshold

controls

down

until

the

meters

just

indicate

"0".

From

the

-36

input

leve',

slowly

incrsase

the

input

level

until

one

bothmeters

just

start

indicate.

one

meter

starts

indicate

First,

back

off

its

threshold

con-

trol

whilestill

increasing

rhe

input

ievel,

unti!

both

meters

just

start

indicate

the

same

input,

i.e.,

threshold

-35

dB.

tZs

14,

FAT

LIMITER

AmPLiFER

epniareae—

FROGRAM

MIXING

CONS

CHE

Figure

Typical

Broadcast

Studio

Applicerion

From

the

threshold

level

established

Step

14,

advance

the

input

level

dB.

Simultaneously

press

the

SINGLE

BAND

0.4

SEC.

RELEASE

and

SINGLE

BAND

DUAL

RELEASE

buttons,

thereby

lock-

ing

both

down.

Adjust

both

the

HIGH

BAND

and

LOW

BAND

SENSITI-

VITY

controls

for

reading

their

respective

meters

Simultaneously

press

the

DUAL

BAND

DUAL

RELEASE

and

SINGLE

BAND

0.4

SEC,

RELEASE

buttons,

thereby

lock-

ing

both

down.

Drop

the

input

level

dBand

adjust

the

HIGH

BAND

and

LOW

BAND

LINEARITY

controls

For

reading

their

respective

meters.

20.

Inerease

the

input

level

and

repeat

the

Step

through

sequence

necessary.

21.

Recheck

Step

dB.

reodjustment

either

thres~

hold

control

required,

recheck

steps

15-20

also.

22.

Remove

jumper

from

point

end

(See

Figure

9}.

23.

Press

front

pane!

POWER

switch

“OFF"

and

remove

line

cord

plug

from

120V

supply.

HIGH

LINEARITY

LGW

THRESHOLD

evened

LOW

LINEARITY

HIGH

SOD

MUGH

SENSITIVITY

ble

LOW

SENSITIVITY

Figure

Location

Catibration

Controls

STEREO

OPERATION

Two

ALTEC

9473A

Limiter

Amplifiers

provide

stereo

control

all

modes

operation

for

both

high

and

low

frequency

bands.

When

connected

for

stereo

operation,

compression

either

ALTEC

9473A

Limiter,

will

cause

corresponding

degree

compression

the

other,

thereby

maintaining

channe'

gain

balance.

Multiple

jacks

ore

provided

for

each

bend

allow

peralleling

additional

limiter

amplifiers.

Figure

illustrates

stereo

interconnection.

oTEREG

TERICOCMNECT

CABLE

alow

[280

mee:

Cute:

RAT

LEFT

CHANNEL

ine

PRE

AAP

LEFT

CHANAEL

DRIVER

AME

‘

rorcrre

caine!

apn

Ses

Sew,

cae

“ere

aly

;

ORG:

EXTERNAL

STERO

INTERCONNECT

SUBTCH

STE

TERICONNE

}

AEM

OSS

355

LIT

CHAN

NES

ANP

AKDT

aAnNEL

DRIVER

ane

Figure

Stereo

interconnect

SERVICING

All

circuit

components

are

easily

reached

opening

the

hinged

front

panel

the

unit.

Normel

servicing

may

done

with

volimeter.

All

pertinent

information

shown

the

schematic,

Figure

10.

Figure

Typical

Limiter

Characteristics

PARTS

LIST

Reference

Destignator

C2,

25,32,

33,34

C3,4

CS76

67,8;

1120

C9,10

C12,

C14,15,36,37

C2)

CRI

CR2,3,4,5,6,7

TRE

CRY

CRIO,11,13,

Q6,7,8,9,

14,15,

16,17,21,24

10,

11, 42,

13,20

218,19

Q22

Q23

R1,73

R2,o4

Ordering

Number

:5-0°-108579--01

15-06-107426-01

15=06-10013

1-91

15+

06-051

240-02

1$-O07-107343-01

15-03

-106218-O7

T5-01-168635-01

15-02-108584-0}

15-06-

106204-0%

15-06-108629-01

15-01-108580-0)

15-01-107523-01

15-01-100255-01

15-01

-108581-01

15-01-108578-01

35-02-107455-01

4B8~01-108576-0'

48-01~102592-01

48-01-108575-01

48-01

-109738-0}

48-01-10701

7-01

48-02-108577-90}

31-04-100464-01

29-01-041819-01

48-03-167318-01

48-03-108575-01

48-03-04)

440-01

46-03-101098-01

46~03-108574-0}

45-03

-04046

i-G2

48-03-1017

111-9)

10-05-

26-487

47~01-104541-0)

Nlame

ond

Description

Cap.,

30V

Cap.,

210%,

50V

Ceop.,

O11

210%,

100V

Coo,,,

©.025

£5

yOoV

cap.,

25V

Cap.,

lyr

15V

Cap.,

200

15V

Cap.,

30V

Cop.,

0.047

+10%,

OOV

Cap.,

0.47

10%,

100V

Cap.,

15V

Cap.,

lOO

20V

Cap.,

50V

Cup.,

3103

40V

Cap.,47

+10%,

100V

Diode,

Zener

+15%,

Disde

Dinge,

Zener

30V

Diode,

Zener

10%

Diode,

IN456A

Diode,

Rectifier,

SCBR~]

Fuse,

3AG

Meter

Transistor,

2N5308

Transistor,

MAFESO0Z

Transistor

(AL2712)

Transistor,

2N4639

Transistor

Transistor,

2N4036

Attenuctor,

25K

Res.

330K

25%,

1/4W

JDOPER

PORT

ROINT

Figure

Input

Switchboord

Asembiy

PARTS

LIST

(Continued)

Name

ond

Desertation

48,76,

77,

78,87,88

47-01-102127-0)

Res.,

WOOKR

45%,

1/4W

Reference

Ordering

Designotor

Number

R3,10,32,33,44,4546,

k4,5

47-0}

-102086-01

R6,8

47~01=102097-91

APF

-CF~-1021

12-0)

57,60

47-013-102082-01

Ri]

47~91-192115-0'

R12,13,42,43

47~O1-10Z094~01

R14,16,34,35

47-04-1021

00-03

R16,17,52,

54,56,59

47-05-100813-01

R18,

19,22,

23,40,

41,55,53,67,

69,83,

47-01-102102-01

R20,21,24,

25,26,27

47eO1+102)10-01

R28,

29,49

,50

47~01+102114-0)

R3G,33

47~01-102066-

R36

,37,62,75

80,81

47~(j1-10207&-C"'

R38

,39

47-01~102079-91

R51,52

47-01-1085B6-

R56

,61,70

47-01

-192090-

R65

47=0)~10213

1-01

R66

47~-C4~102098-

R71,72

A7~-O}-102030-0)

R74,75

47-03-102346-Ci

R82

47~01~-102073-01

R85

,86

47=-01-102038-01

RES

47=91~102351+01

51-02~108588-01

51-02-106589-01

56-04-004833-01

56-08-007375-01

56-07-0115

298-01

Res.,

2.2K

29%,

1/4W

Res.,

6.2K

25%,

1/4W

Res.,

27K

45%,

1/4W

Res.,

}.SK

225%,

I/4w

Res.,

36K

45%,

/4W

Res.,

47K

£5%,

1/4W

Res.,

8.2K

245%,

1/4W

Potentiometer,

1OK

Res.,

10K

£5%,

1/4W

/4W

Van

Res.,

22K

+596,

Res.,

33K

+5%,

Res.,

3302

«5%,

—

Res.,

45%,

I/4W

Res.,

5KQ

25%,

1/4

Res,

8.245%,

1/4

Res.,3.3KQ

45%,

1/4W

Res.,

SOK

45%,

1/4

Res.,

6.8K

245%,

1/4W

Res.,

45%,

1/4W

Res.,

3302

=10%,

1/4W

Res.,6202

25%,

1/4W

Res.,

222

45%,

1/4W

Res.

470

2210%,

1/2W

Switch

assembly

Switch

assembly

Transformer,

input

Transtormey,

power

Transtormer,

output

wif

QUTPUT

STRAPPING

INFORMATION,

FOR

600a, STRAP

2-3

AND

CONNECT

+4,

FOR

1900,

TRAP

1-2

3.4

AND

COonnecr

1-4,

INPUT

STRAPPING

INFORMATION.

FOR

$0Ca,

STRAP

7-6

ANT

COMNECT

‘Te

6-9

FOR

159m.

STAL®

6-79

8-9

AND

CONNECT

6-&

SAL

OCES

TS.

CAPECITOR

VALLES

ARE

micaranads

MLL

RESSTOR

vacuts

ake

Ones,

‘Abwatt,

28%

MOTE:

UNLESS

CTwEawiSE

SPECHHO

wis

Figure

10.

Senomer'c,

473A

Limiter

Amplifier

eck

M27

Mas

Sata

eae

ERLE

LIMITER

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