Goldmund GOLDCUBE User manual

THEGOLDMUND

GOLDCUBE

Swiss

Made

ATTENTION

connectionor

manipulationmust

bedonebefore

reading

thoseinstructions.Damage

theamplifiermayresultifthe

followinginstructions

are

not

consciouslyunderstoodand

applied.

UNPACKING

YouwillfindintheGOLDMUNDGOLDCUBE

packing

A pair

oftheamplifiers,

Thismanual,

-Accessories

andsparefuses.

Pleasekeep

the packaging

in caseyou need

to transportthe

amplifiersatalater

dateorifyouhavetosendthemfor mainte-

nance.

CHOICE

AMPLIFIERLOCATIONAND COOLING

The

GOLDMUNDGOLDCUBEhasbeendesignedto beused

combination

with the GoLDMUNDAPOLOGUEspeakersys-

tem,in

thespeciallodgingof itsback

panel.

Inthiscase,the

amplifieris automatically

reachingits proper

temperatureof

functionforoptimized

performances.

lf usedinadifferent

configuration,donotforget

thattheGOLD

CUBE,asallthehigh

quality

amplifiers.

generates

alarge

amount

of heat.

Itismandatory

toallowa

proper

coolingofthebodyoftheGOLD

CUBEwhich actsas heatsink. Avoid a locationwhich is not

properly

vented.

LINEVOLTAGEADJUSTMENT

The

GOLDMUNDGOLDCUBEamplifier

isinternallywiredfor

specif

icline

voltage.

ATTENTION

: A 234V adjustedamplifier

willfunctionproperly

orACline

voltagebetween2OOVand245Y.For

a117Vversion,

the

AClinemustdeliverbetween

105and 125V.lfyour

AC lineisusually

outof

these

tolerances,

please

consult

your

GOLDMUND

dealer.

Please

checkthe

value

ofthe

mainlinef

use.

Thisfuse

islocated

the bottomof the amolifier,

near

acorner.

The

golden

lid

canbe

removedwith

asmallscrewdriver

orbetter

with

acoin,andthenthe

use

holder.

Usea3Aslow-blow

fusefor 22OV

anda5Aslow-blow

fusefor

110V.

4. CONNECTIONS

Connectthe

power

cordoftheamplifier

the

nearestwall

plug.

Useonlya3lugs

grounded

plug,

for

safety

reasons.To

get

the

bestsound

oftheamplif

ier,

avoidany

multiple

plug

extension

cord.

Connecttheinterconnect

betweenthe preamp

andthe power

amp.

The

RCA

female

socket

thehighest

quality

WBTsocket

(ground

connectsfirstandthe

plug

maybelockedifyou

usethe

GOLDMUND-MlTinterconnect).

theGOLDCUBE

used

with

APOLOGUE,

usethe

provided

bi-male

iunctions

to plugit inside

the special

lodgingin the

speaker

back.

The

properposition

ofthecube

iswhenthe

power

cordandthe

power

switchare

visible

thebottomangleof

the

cube

from

theoutside.

Otherwise,

connectthespeakercablestothetwo banana

recep-

taclelocated

on the oppositefacefrom the input. The "+ " is

markedwitha red

dot.

The

amplifier

non-invertingin

phase.

-2-

5.1

AMPLIFIERS

CONTROLS

Onthe front plate

of the GOLDMUNDGOLDCUBEareonly

accessible:

Thepower

key,used

to power

theampon.

Whenactivated.the speakeris connectedafter a very short

delayandthered

LEDswitches

on.The

amp

ispowered

off by

switching

offthe

power

key.

Theredledwillfadeveryslowly,

indicating

dischargeofthe

filtering

capacitorsandthespeaker

will

bedisconnectedafterfewseconds.

5 .2 The

two railfusesockets.

Each

railfuseholderis

protected

bya

golden

lid.which

canbe

removed

usinga coin.A red

point

LED,locatednear

the

fuse

indicate

thatthe

fuseis

burned

whenit

glows.

SOUND

OUALITYOPTIM

IZATION

6 .1 Warm-up

soniceffect.

lfthepower

amplifierhasnotbeen

powered

offforafew days,

theoptimumsound

quality

only

reached

after3Ominutes.

This

delay

has

beenoptimized

to be

minimal

andthe sonic

quality

when

lust

powered

ismuchhigher

thanother

qualitypower

amplifiers.

6 .2 Speaker

polarity.

Evenif

youhave

phase

inverter

your

preamplif

ier

(as

onthe

GOLDMUNDMIMESIS

2orMIMESIS7).

andeven

ifyouhave

carefully

selectedthe

proper

line

phase

(see

innext

paragraph),

thereis

apossibility

toagainincrease

thesonic

quality

ofyour

speakers

by reverting

the polarity

of the speakercableamp

termination.But

sincetheline

phase

andthespeaker

polarity

interfere

to eachother,

you

have

toexperiment

carefullyallthe

combinations

before

picking

therightone.

your

preamp

has

anabsolute

phase

inverter,

this

will

interfere

too.lfithasnot,

don'tforgettheresultwilldepend

ofthesource.

mostof therecord

and

CDbeing

recordedwithout carefor the

absolute

phase.

patient..

-3-

6.3 Mainline

ohase

inversion.

The

sonic

quality

your

GOLD

CUBE

may

slightly

improved

the

mainAClineis

properly

connected.

Try

toinvertthe

plug

your

amplifier,using

aspecialadapter.

Werecommend

that

youproceed

carefullytotry

this.

Youmust

itin

combination

withthespeaker

polarity

and/or

with

abso-

lute

phase

switchingtobesureofthe

result.

7.1

SAFETYFEATURES

The

GOLDMUNDGOLDCUBEamplifier

provides

verysophisti-

cated

features

protectthe

amplifierandthe

speaker

againstall

kindofmishandleorcomoonent

failure.

Protection

against

DC.

TheGOLDCUBEis a DC-coupledamplifier.

lf theassociated

preamplifier

isbadly

designedordefective

(often

true

forthe

tube

preamps),

thespeakercouldbedamaged.

The

detection

circuitoftheGOLD

CUBE

totally

immune

toanysoniceffect

but

willimmediately

switchoffthe

speaker

sucha

malfunction

occurs.

Thespeakerwillbeimmediatelyandautomatically

reconnected

assoonasthe

perturbation

disappears.

Protection

against

oscillations.

Inthe sameway, the speaker

willbedisconnected

if a large

amount

of highfrequencyoscillation

is present

andshowsa

danger

forthe

tweeters,even

ifthese

frequenciesremain

unno-

ticed.

The

amplifier

returns

normalif

the

oscillationdisappears.

Protection

againstshort-circuits.

lf oneoutput is short-circuitedby accidentandthe current

becomestoo

high,

oneofthe

railfuse

may

blow.

thiscase,thesmall

LEDlocatedatthetopofthedefective

fuse

lidwill

glow.

To replace

thedefective

fuse,

switchthe amplifier

offfor 1O

minutesfirst.Then

openthetop

fusecover

with

acoinora

large

screwdriver.Thef

use

loaderisthenaccessibleunderthe

golden

coverand

must

beremovedbyturning

off

with

ascrewdriver.

7.2

t.5

-4-

Youmust

usea5

Ampsfastf

use

(or

6.3

Ampsif

you

useverylow

efficiency

speakers)or8Ampsultra-fast.

Then

putthecoverbackinposition

andswitchthe power

onif

theshort-circuit

has

beendetectedandremoved.

To avoidthe fusesto blow, avoidto short-circuitthe outDut

terminalsaccidentally.

Thereis no riskto leavethe soeakerterminalsunconnected

when

theamoison,

8. MAINTENANCE

The

GOLDMUNDGOLDCUBE

goldplated

with

a 1Omicrons

18kt

gold

layer,

usingthe best

ieweler

technology.

lt should

never

alterexternally,exceptifmishandled.

Tocleantheamplifier,use

avery

softclothto avoid

scratching

the

gold

surface.

Otherwise

theGOLDMUNDGOLDCUBEamplifier

requiresno

maintenance.For

theaudio

purist

whowantsto keephis

amp

sounding

new.we

only

recommend

thataftera

year

ortwo,

you

haveatechnician

oranofficialGOLDMUND

representative

readjustthe

offset.

Thisvery

simpleoperationtakesonlytwo

minutes

andwill

give

you

thesafetyoflong

years

ofunmatched

sound

quality.

IMPORTANT

NOTICE:

The

Goldcubeshouldneverbeleft

powered

on,withoutinput

cable

connectionto apreamplifier.

lfwarmedupwithout

con-

nection.

please

insert

short-circuit

plugs

delivered

with

thecube

toavoid

any

oscillation.

-5-

TECHNICAL

DATA

POWER

- Nominalpower

: loowRMS(2-8Ohmsl.

60WRMS

- 16

Ohmsl.

- Msximum

power

: l50WRMS13Ohms).

- Maximumvoltag6:

35Vpeak.

- Maximum

cu,,cnt: 20ADoak.

FREOUENCY

RESPONSE

Th6safiguros

are

valilfor

any

levet

between0and

nominal

power.

- +/-

O.ld8.O.IOOkHz.

- +/. I dB,0

40OkHz.

- +/.3d8,0

0.9

MHz.

INPUT

SENSITIVITY

- Nominallevel : 1.55V

(+6dBl.

- Inoutim9odanca

: 50kohms.

GROUPO€LAY

- Propagarion

delay

< lOOns

stablG

withtr6quencylrom

OCto20OkHz.

DISTORTION

Figlre3vElid

,or

8ll

lovelsf.om

0to25V/ Iohns.

- Dynamic

: TID<0.O1

%(.8OdBt.

. Sbtic I THD<0.O1

%G8OdBl.

SPEED

- Slew.ate: > 2oov/us

. Riso

tim€ : < soons.

NOISE

- w8ightedAsAA : > l0o dB.

OPERATINGTEMPERATURE

- Room

l€mpsraturo: -3O

to +4O

dog,e6sCalsius

(-22

to +1O4

dsgr€ss

F8h'rnhoitl.

- In$m€ltsmpeGtu.e

: +45to +65dogreesColsius

{

+ 1l3 to + 149dcgr€caFah.6nheit}.

POWER

SUPPLY

- Nominsllinsvolt'gs I 10O,117,or23V.

- Inp{tvolt8geranga : +/- 10%.

- Maximum

powga

co{Eumption:250W.

SAFETY

F€ATURES

- DC

protsction

th.oshold: 5V.

- HF

protefiioo

thr€shold: 3VRMSat50kHz.

- Inprrrvoltag€

fuso | 3Adow{lowfo.22OVlSAstow.btowfo. llOV.

- Shon.ci,cuit

o.otrction : 2fu36 5

A fasr,

SIZEANOW€IGHT

- 12.7

l5"l

wx l2.7cm

(5'lDx 12.7

{5"}

- Weighr

:7kGnet.

-6-

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