QUAD 33 Manuale utente

Contents

Introduction

Installation

Mounting the units

Connections

Pickup

(Disc)

AdaPtor ...

TapeAdaptor

lllustrations Page

Installation

Schematic 3

Pickupandmotor wiring 4

MountingtheQuad33

Connections

to Quad303

Quad

33controls

lssue

4/3m/271

DIN plugs

DISC

input

Disc Adaptor Board

Tape and Radio inputs

TapeAdaptor Board

Tape Adaptor adjustments

Quad33rear panellaYout

Quad33performancecurves

Quad303

performancecurves

Page

4&5

6to10

Initial Checks

andOPeretion

Controls

Loudspeaker

phasing

Loudspeakerposition

Operation

Summary

Service

Specifications

Guarantee

THE

ACOUSTICAL

MANUFACTURING

CO.

ST. PETERS

ROAD, HUNTINGDON,

ENGLAND

Telephone:

Huntingdon

(0480) 2561

Telegrams:

Acoustical

Huntingdon

13to 15

to 23

LTD.

QUAD

fortheclosest

approach

to the

originalsound

INTRODUCTION

This amplifier has beendesignedto provide the best

possiblequality of reproduction but it must be borne

in mind that the standardof performance

of the com-

plete equipmentwill be limited by that of the poorest

link in thechain. Thus,thegramophone

motor,pickup,

loudspeaker,etc.,shouldallreceive

careful

consideration

if full advantage

is to betakenof the capabilitiesof the

amplifier.

A complete

installationis shownin Fig. I and the

samobasicarrangement

will apply in wholeor in part,

whateverassociated

equipmentis usedwith the Quad

33. Installation is quite straightforward and should

present

no difficulty to the intelligent enthusiast

pro-

vided the following notesare observed.

Pleasenote

thatthree

printed

circuitboards

fromthe

Quad

33are

packed

separatelyfor safe

transit. These

must be insertedduring installation. See

Fig. 3 and

alsoinstructions

containedin the packing.

Page Two

INSTALLATION

Normally equipment of this type may be either

mounted in a wide varietryof housings or usedfree-

standing, and if you are designingyour own layout it

might beadvisableto assemble

all theparts in a mock-

up form before deciding on the final arrangement,

just

to make sure there are no unforeseendifficulties of

operationor inter-unit wiring, etc.

Adequate ventilation must be provided for units

producingheat,including transistorised

lx]wer amplifiers

and if the latter are to be mounted closer than about

12inchesfrom either control unit or tuner it might be

nec€ssary

to experiment with orientation and position

to ensurethat no hum is induced

in thelatter units.

0lNplugto

DISCinputotO33

PageThree

FIG. 1

PLUGIN BOAROS

2 x M12017 M120lS

Closeproximity of the control unit and tuners to

each

othershouldcause

no problemunlessthe control

unit is mountedimmediately

on top of the tuner, in

which casea spaceof about two inches

shouldbe left

between

them.

Hum canalsooccurif a low output magnetic

pickup

is too closeto a mainstransformer

or if its leads

run

closeto themainswiring.(See

Fig. 2).

All metal

parts

must

beearthedbut,because

multiple

earth connections

causehum, they shouldbe earthed,

directly or indirectly,by oneconnection

only, and the

wholeinstallationearthedat onepoint suchas the E

terminalon the rear of the control unit, OR the third

pin of thecontrolunit mainssocket,but not both.

(Note: All the Quad units are already bonded

together

by their own inter-connecting

cables).

Always

follow the

manufacturers'

instructions

supplied

with pickup, motor, taperecorder,

etc.,and refer any

query which may arise to your dealeror in caseof

difficultyto themanufacturer

concerned.

Page

Four

If the Quad 33 is not to be usedfree standingyou

will requirean aperturelA' x 3" as shownin Fig. 3

and a templateis providedin the rear of this booklet

to assistin marking thisout on thecabinet. Thecover

is then removedfrom the Quad 33, the unit p'assed

through the aperturefrom the front so that its lugs

locatein theaperture,andthecover

replaced

from the

rear,thusgrippingthecabinet

panelbetweentheQuad

33 front castingand its cover. The securing

screws

shouldbeinsertedfinger

tightand

then

given

one

further

half-turn to lock the unit firmly in position.

I' (2Omm)

tick

Lugs .OUAD 33cover

CovsrLocatins Slid6

FIG. 3

The Quad 303 carries no controls and may be

mounted

out of sightinside

thecabinetor at anyother

convenient

positionin the installation.

The Quad 303may be eitherstoodon its feeton a

shelfor base

boardof a cabinet,

or moresecurely

fixed

by drilling four holesin theshelfor board to coincide

with thefeetcentres,

removing

thefeetsecuringscrews

and

passing

thelonger

screws

provided,

upthroughthese

holes, through the feet which act as spac€rs

to assist

circulation of air under the amplifier, and into the

tapped

bushesin thebase-plate.

Slotsor holes

shouldbe cut in or nearthe baseand

in or near the top of any enclosedcompartmentto

permit a flow of air upwards

throughthecompartment,

pastand throughtheamplifierto assistventilation. In

confined

spaces

wherethe exit ventsare not directly

over the amplifier a deflector plate of plywood or

asbestos

maybemountedat aninclined

angleabovethe

amplifierto helpguidetherisingwarm air towards

the

exit vent and prevent an accumulation

of warm air

underaclosed

horizontal

top.

Page Five

CONNECTIONS

Din styls plugs showing method of assembly. See individual illustrations

for Din connections.

ControlUnit to PowerAmplifier

Two leadsare supplied

with the control unit. That

with a 4-pin connectorat eachend is reversibleand

connectsthe control unit output to thepoweramplifier

input. The other connects

the switched

mains supply

from the control unit to the power amplifier and the

2-pin plug at the control unit end of this lead is

reversible.

(See

Fig. l0). Longer leadsare permissible

whererequiredfor special

installations

(see

Specification

onpage

2l).

Pape Six

Power

Amplifier

to Loudspeakers

Ordinary lighting flex or similar cablemay be used

for connecting

the loudspeakers

to thepoweramplifier

unless

averylongrunisinvolved

in which

case

aheavier

calibrecableshould

beused.As a roughguidetheDC

resistance

of the cableshouldnot exceed

about5,%

thenominalimpedance

of theloudspeaker.

Eachloud-

speaker

shouldbe connectedto its appropriate

llower

amplifieroutput sothat thetwo pairsof wires

arecon-

nectedin the sameway, to ensurethat the speakers

operatein phase.

For example,

if thetop outputsocket

on one channelis connected

to the left-handterminal

of its speaker,the top output socket on the other

channel should also be connectedto the left-hand

terminal of its speaker.This is quite straighfforward

but should there be any doubt the phasing can be

checked

later experimentally. (See

Page l5). Where

one loudspeaker

only is usedfor mono, phase

is not

important and in this case

eitheroutlet may be used

andthesocketsof theotherchannelleft vacant.

In cases

whereloudspeakers,

suchastheelectrostatic

loudspeaker, also require an eneryising supply, the

instructions

provided with the loudspeaker

should be

followed. Eachloudspeaker

should

becapable

of hand-

ling thefull output of the poweramplifier.

Notez Quad electrostaticloudspeakers

prior to serial

number16800

needslight modification

before

beingused

with the Quad 303amplifier.

Pickup

(Disc) Input

The pickup input is via a 5-pin plug and the same

connections

areusedfor all types

of pickup. The neces-

sary changein input circuitry to suit differenttypesof

pickup is achieved

by the Disc Adaptor Board. This

board providesmatching for pickups of low output

magnetic

types

(Ml), high output magnetic

types

(M2),

ceramic

types

(Cl), anda spare

position

(Sl), according

to theedge

inserted

into the holder. (See

Specification

on Page

20).

The M2 positionshould normally be usedfor most

magnetic

pickupsbut for those

with very low outputs

Ml should

beusedinstead.

The fourth position is to enable the amateur or

professional

engineer

to provideany other circuit con-

flguration

hemayrequire

and

it also

provides,

of course,

facility for accommodating

any new type of pickup

which may be introduced,

requiring a differentinput

from existing

types.

Page Seven

*6lril ru.*tgdr foebd,

FIG. 5

input and an AM tuner for long distance

reception

Radio 2. Quadself-powered

tunersare suppliedwith

the correctconnectors

andmay be plugged

in immedi-

ately. Theconnectors

used

onotherself-poweredtuners

should

beadaptedasn€cessary

andthosealreadyfitted

Rldb I fS.Qlt

uTcprRrcold

,f,-,Sc

T,?t--

euAD

Sbrt AgfSG

FIG. 7

DISC ADAPTORBOARD

Radio (See

Fig.

Socketsare providedon the Quad 33for two radio

tunersto be connected.

For example,

an FM tuner,

used

for monoor stereo,

maybe connected

to Radio I

PageEight

with thesame

typeof plugshouldbechecked

to ensure

that thesameconnections

areused.Theoutputof such

tunersshould be suitablefor the Quad 33 input of

l00mV and l0OK ohms (stereo) or l00mV and

50K

ohms

(mono).

The mains supply for thesetunersshould also be

takenfrom the mainsoutlet sockets

at the rear of the

Quad

33.(See

Fig.l0).

WARNING

On no accountshouldtheHT ILT lead

of earlier

Quadtuners

be connected to the power supplies socketsof the Quad 33

control unit. If such tuners are used a separutepower pack

must be provided.

Tape

Threeessential

functionsare provided

for tape

recording:

(l) to providea signal

of theright level

for recording,

not afiectedby any of the tone,filter or volume

controls

andwithout afiectingnormal listening;

(2) to accepta signal

of any likely level from the re-

corder for replay and subject this to all the

appropriatecontrolfacilities,and

FIG. 8 TAPE ADAPTOR BOARD

(3) to monitor thesignal

off thetape

duringrecording

without interruptingtherecordingoperation,

pro-

viding, of course,that the tape recorderhas a

monitoroutput.

PageNine

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