Grimm Audio MP1 Instrucciones de montaje

Please read this manual before operating the unit!

TPInLB

Table of Contents

Introduction 4

ImportantSafetyInstructions 5

1.Operation 7

2.Modifyingfactorysettings 8

3.Specifications 12

4.Appendix1,Microphonevoltageslist 13

5.GrimmAudioLimitedWaranty 15

Introduction

ThankyouforchoosingtheGrimmAudioMP1powersupplyfortubecondensor

microphones.TheMP1iseminentlyfittobeusedwithmoderntubemicrophones,

butithasbeenespeciallydesignedtoreplacethetraditional(usuallypassive)power

suppliesthatorginallycamewiththenowuniqueandverycostlytubemicrophones

fromthefiftiesandsixties.Contrarytowhatmanybelieve,theseoldpowersupplies

canbeimprovedupon,bothwithregardtostability,noiselevelandlastbutnot

leastsoundquality.Andthisisnotjustbecausetheelectrolyticsintheoldsup-

pliestendtodryout,andcarboncompositeresistorshaveshotupinvalueorgone

noisy:evenifthesehavebeenreplacedwithmoderngoodqualitycomponents,the

classicalsupplyisstillnomatchfortheMP1.

Important Safety Instructions

Grimm Audio gaat er van uit dat u deze Engelstalige tekst volledig begrijpt. Als u hier moeite

mee heeft dient u contact op te nemen met Grimm Audio. Op verzoek sturen wij u een vertaling

toe.

Grimm Audio nimmt an, dass Sie diesen Englischen Text völlig verstehen. Wenn notwendig,

nehmen Sie bitte Kontakt auf mit Grimm Audio. Auf Wünsch wird Ihnen eine Übersetzung zu-

geschickt.

Grimm Audio suppose que le lecteur comprend parfaitement le texte en Anglais ci-dessous. En

cas de doute s.v.p. contacter Grimm Audio. Si necessaire, on pourra vous envoyer une traduc-

tion.

Grimm Audio da por supuesto que el texto en versión Inglesa no ofrece ninguna duda de in-

terpretación y se entiende integramente. Si este no fuese su caso rogamos contacte con Grimm

Audio quien, a petición, se encargaría de enviarle la correspondiente traducción.

Please follow these precautions when using this product:

1.Readtheseinstructions.

2.Keeptheseinstructions.

3.Heedallwarnings.

4.Followallinstructions.

5.Dangerousvoltageisinsidethisapparatus.Openingisonlyallowedbyqualified

servicepersonnel.

6.Verifylinevoltagebeforeuse.

7.Donotdefeatthesafetypurposeofthepolarizedorgrounding-typeplug.A

polarizedplughastwobladeswithonewiderthantheother.Agrounding-typeplug

hastwobladesandathirdgroundingprong.Thewidebladeorthethirdprongare

providedforyoursafety.Whentheprovidedplugdoesnotfitintoyouroutlet,con-

sultanelectricianforreplacementoftheobsoleteoutlet.

8.Protectthepowercordfrombeingwalkedonorpinched,particularlyatplugs,

conveniencereceptables,andthepointwheretheyexitfromtheapparatus.

9.Unplugthisapparatusduringlightningstormsorwhenunusedforlongperiods

oftime.

10.Donotusethisapparatusnearwater.

11.Donotusethisapparatusoutside.

12.Donotexposetheapparatustodrippingorsplashing.Donotplaceobjects

filledwithliquids(flowervases,drinkcans,coffeecups,etc)ontheapparatus.

13.Cleanonlywithadry,soft,non-fluffycloth.Donotsprayanyliquidcleaneronto

thecabinet,asthismayleadtodangerousshocks.Donotsprayanyliquidcleaner

ontothefaceplate,asthismaydamagethefrontpanel.

14.Installinaccordancewiththemanufacturer’sinstructions.

15.Donotinstallnearanyheatsourcessuchasradiators,heatregisters,stoves,or

otherapparatus(includingamplifiers)thatproduceheat.Avoidexposuretodirect

sunlight.

16.Useonlyattachmentsoraccessoriesspecifiedbythemanufacturer.

17.Useonlywithacart,stand,bracket,ortabledesignedforusewithprofessional

audioormusicequipment.Inanyinstallation,makesurethatinjuryordamagewill

notresultfromcablespullingontheapparatusanditsmounting.Ifacartisused,

useprecautionwhenmovingthecart/apparatuscombinationtoavoidinjuryfrom

tip-over.

18.Thisunitrunsslightlywarmwhenoperatednormally.Operateinanormalventi-

latedarea.Ifthisproductwillbeinstalledinarack,makecertainthereissufficient

airmovementwithintherack.

19.Referallservicingtoqualifiedservicepersonnel.Servicingisrequiredwhenthe

apparatushasbeendamagedinanyway,suchaswhenthepower-supplycordor

plugisdamaged,liquidhasbeenspilledorobjectshavefallenintotheapparatus,

theapparatushasbeenexposedtorainormoisture,doesnotoperatenormally,or

hasbeendropped.

20.WARNING: Toreducetheriskoffireorelectricshock,donotexposethisappa-

ratustorainormoisture.

1. Operation

Upondelivery,anMP1isfactorysettothetypicalsupplyvoltagesofyourmicro-

phonemodel.ThismicrophonetypeisindicatedatthebackoftheMP1.Ifthe

microphonefeaturesremotecontrolofitspolarpattern,thiscanbecontrolledwith

theoptionalknobonthefrontpaneloftheMP1.Thereisamulti-pinXLRcablecon-

nectorsuppliedwiththeMP1.Youwillneedtoattachthisconnectortoyourown

microphonecable(orletyourdealerdothat).Forwiringdata,refertothe‘specifica-

tions’chapterofthismanual.Pleasemakesureyoudoublecheckifyousoldered

therightwiretotherightXLRpin,yourmicrophonecangetdamagedifyoufailto

doso!

Ingeneral,weadvisetofirstconnectallcablesandthenturnontheMP1.Bydoing

sooneavoidspotentialdamagetotheconnectors’plating.Itisgoodtoknowthat

duetocharacteristicsofour‘shuntregulator’circuitrythepeakcurrentislimited,

whichwilllengthenyourmicrophones’tubelife.

TheMP1isdeliveredwithadetachablefoot.Thiscanberemovedbygentlytwist-

ingthefootcounterclockwise.Withoutfeet,twoMP1’scanbeconnectedtogether

toformastereo1U19”unit.AnMP1generatessomeheat.Whenusingastereoset

ofMP1’sina19”rack,itisadvisedtokeeponefreerackspacebelowandaboveto

provideoptimalcooling.

Technology

TheMP1featuresaspeciallydesigneddiscreteshunthigh-voltageregulatorfed

fromacurrentsourcetomaximisesuppressionfrommainsinducedanomalies.It

alsooffersverylownoise(typ.-96dBVor16uV20-20.000Hzunweighted).More

importantly,thisshuntsupplysoundsmorenaturalthanthemorecommonlyused

modernseriesregulators,duetotheabsenseofelectrolyticcapacitorsattheout-

put.

Itwouldhavebeenquickandeasytorelyonindustrystandardvoltageregulators

fortheheatersupply.However,inquiteafewclassicalmicstheheatervoltageis

alsousedtobiasthegridoftheamplifyingtubeinthemicrophone,implicating

anopengatewayfromheatersupplytothesensitiveinputofthemic’samplifying

stage.Wethereforechosetodesignacleanandultralownoisediscretevoltage

regulatorfortheheatersupplyaswell.Itfeaturesaverylowdrifttoensurethe

heatervoltagealwaysremainswithinspecs.

Boththehigh-voltageandtheheatersupplieshaveanextra‘crowbar’protection

circuitthatwillswitchonincaseoneofthesuppliesbreaksdown.Thisisanextra

lineofdefencetoprotectthevaluabletubeinyourmicrophone.

2. Modiﬁying factory settings

YourMP1isfactorysettothesupplyvoltagesofthemicrophonespecifiedinyour

order.IncaseyouneedtoadjusttheMP1tothesupplyvoltagesofadifferent

microphone,therearevariousinternalsettingstofacilitatethis.Wehavetowarn

youhoweverthatselectingawrongvoltagewillveryprobablyleadtodamageof

the(sometimesveryexpensive)tube.Sounlessyouareanexperiencedengineeror

likelivingdangerously,wedonotadvisetochangethefactoryvoltagesettings!In

anycaseGrimmAudiocannotacceptliabilityfordamagetomicrophones.Forthose

peoplethatstillwanttochangetheinternalsettings,pleasereadthefollowingin-

structionscarefully.

Inappendix1alistcanbefoundofknownmicrophonetypeswiththeirfactory

advicedsupplyvoltages.Shouldyourmicrophonenotbelisted,pleaseconsultthe

originalmanufacturer.PleasealsocheckthisMP1manualonGrimmAudio’sweb-

site,itmighthavehadanupdateofthemicrophonelist.Threepresethighvolt-

ageareavailablefromtheMP1:120,145and210V.Thesearesetinternallyusing

jumpersandnotbyexternalcontrols,toavoidcostlymistakeswhileamicrophone

isconnected.Atrimpotallowssome(+/-8%)adjustmentofthesevoltages.TheHT

supplyisinherentlyshort-circuitproofasitisashuntsupply.Asanextrasafetya

“crowbarcircuit”willshutdownthecurrentsourceincasetheoutputvoltageex-

ceedsthenominalvaluebymorethan12%duetomalfunctioning.However,Grimm

Audiocannotacceptliabilityincaseofdamagetomicrophonesshouldeventhe

protectioncircuitfail.

Fortheheatervoltagetwopresetvaluesareavailable:6.0and3.9V.Thesevalues

arechoseninconjunctiontowhatisprescribedformostclassicalmicrophones.

Theytooaresetbyinternaljumpers.Athirdjumperpositionenablesatrimpotand

allowstheheatervoltagetobesetatanydesiredvaluebetween3.6and7.0V.In

addition,theoutputpolaritycanbereversedassomemicsrequirenegativeheater

voltage.Noiseisverylow:typ.<-120dBV(<1uV),animprovementofatleast

30dBoverindustrystandardvoltageregulators.Theoutputisshort-circuitproof,

thecurrentlimitsat0.5A.Asanextrasafetyacrowbarcircuithasbeenaddedto

protectthemicagainstunforseenfailuresshouldtheheatervoltageexceedthe

nominalvalueby10%(incaseofthevariableheatervoltagesettingasecondtrim-

potallowstheusertosetanappropriatethreshold).However,GrimmAudiocannot

acceptliabilityincaseofdamagetomicrophonesshouldeventheprotectioncircuit

fail.

Check the voltages output of your MP1

HowtheMP1isset,caneasilybemeasuredfromtheoutside:abluetestsocket

allowsthemeasurementoftheheatervoltage,aredsocketgivesaccestotheHT

dividedbij10(forsafetyreasons);ablacksocketpovidesagroundreference.These

are2mmsocketssomultimetertestpinsfitdirectly.Pleasecheckthesevoltages

beforeconnectingthemicrophone.Markthattheheatervoltagewillmeasureap-

proximately0.1Vhigheratthissocketthanindicatedabove.Thisisonpurposeto

compensateforcablevoltageloss.

Tominimizetheriskofaccidentaldamagetomicrophonesequipedwith3.9V

tubesbypluggingtheseintoa6VMP1supply,GrimmAudiohasdecidedtodeliver

its3.9VversionwithanXLR6socketandthe6VversionwithanXLR7socket.The

factorysetvoltageisindicatedontheback.Ofcourse,ifauserchoosestochange

theinternalvoltagesettings,theXLRpincountnolongergivestherightindication!

Thisisoneofthereasonswedisencouragethechangeoffactorysettings.

TheMP1featuresarotaryswitchtoallowachoiceofpolarpatternonmicrophones

equippedwithsucharemotecontrolinput.ThecorrespondingpinontheXLR6or

XLR7microphoneconnectorcanbevariedbetween0Vandthe120or145HTvolt-

agesorbetween0VandHT+40V,dependingontheinternaljumpersetting.For

example:ifHTissetto120V,itcanbevariedbetween0and120Vor0and160

V.(The40Vover-voltageisnotavailableatthe210Vsettingastherearenomicro-

phonesthatrequirethat).

Changing the internal settings

OpeninguptheMP1andchangingitsinternalpresetsortrimmingsisbestlefttoa

trainedtechnician.Whenswitchedon,therearepotentiallydangerousvoltagesas

highas300Vinside.GrimmAudiocannotacceptanyresponsabilityfordamages

toeitherpersons,ortheMP1itself,ortoanymicrophoneconnectedbyunwittingly

chosenvoltagesorpolarities.

BeforeopeningtheMP1,switchoffthemainspowerandremovethepowercord.

Alsoremoveanyaudiocables.Wait30secondstoallowtheHTontheelectrolyt-

icstoreachasafevalue(<40V).Removethe2screwsfromonesideofthecover

aswellasthe2screwoppositeofthemontheotherside.Carefullyslidethecover

backwards,awayfromthewoodenfront.Theelectronicswillthenbecomevisible.

Anoverviewofsettingandtrimpotsofthepcbisgiveninfig.1onthenextpage.

High Tension (HT) settings

Jumpers7to10settheHT(highvoltagetothemicrophone)to120,145or210V.

Thejunperontheleft-handrowsetsthevoltage,thejumperontheright-handrow

setsthecrowbarprotection.Theyshouldalwaysbechangedinpairs:bothinthe

120Vposition,orbothinthe145Vposition,orbothinthe210Vposition.Failure

todosomayshuttheMP1down,orincriminatecorrectprotectionagainstover-

voltage.

Inaddition,J4mustbesettotheupperpositionwhen210VHTischosen.(Failure

todosowillstilloutput210Vbuttheshuntsupplywillnotbeabletofunctionop-

timally,possiblydegradingsoundquality).

ChoosethelowerpositionforJ4ifyouwantawiderrangeof0-160Vavailablefor

polarpatterncontrolinthe120VHTcase.Thiswillalsoworkforthe145VHT,

resultingina0-184Vvariablevoltage,althoughnomicrophoneisknowntousthat

needsthissetting.

ThetrimpotallowssomeadjustmentoftheHToutputvoltage.Thecrowbarprotec-

tionthresholdsremainfixed.Trimmingtheoutputvoltageclosetothetreshold

valuesisnotrecommendedasthisincreasestheriskofill-triggeredshutdown.

ToresetacrowbaractionitsufficestoswitchoftheMP1,waitafewsecondsand

switchonagain.

Heater Voltage Settings

Thejumperssettingtheheatervoltagearelocatedtotherightinfig.1.

FirsttakealookatthetwojumpersJ2&J3intheright-handtopcorner.Theyset

theheatervoltage’soutputpolarity:||ispositive.Changetheirorientationby90

degrees:==isnegative.Checkwiththered(plus)probeofthemultimeterinserted

intothebluetestsocket(nomicconnectedyet!).

 Fig1.VoltageadjustmentjumpersinsidetheMP1.

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