mp1 manual

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  • Please read this manual before operating the unit!

  • TPInLB

  • 3

    Table of Contents

    Introduction 4

    ImportantSafetyInstructions 5

    1.Operation 7

    2.Modifyingfactorysettings 8

    3.Specifications 12

    4.Appendix1,Microphonevoltageslist 13

    5.GrimmAudioLimitedWaranty 15

  • 4

    Introduction

    ThankyouforchoosingtheGrimmAudioMP1powersupplyfortubecondensormicrophones.TheMP1iseminentlyfittobeusedwithmoderntubemicrophones,butithasbeenespeciallydesignedtoreplacethetraditional(usuallypassive)powersuppliesthatorginallycamewiththenowuniqueandverycostlytubemicrophonesfromthefiftiesandsixties.Contrarytowhatmanybelieve,theseoldpowersuppliescanbeimprovedupon,bothwithregardtostability,noiselevelandlastbutnotleastsoundquality.Andthisisnotjustbecausetheelectrolyticsintheoldsup-pliestendtodryout,andcarboncompositeresistorshaveshotupinvalueorgonenoisy:evenifthesehavebeenreplacedwithmoderngoodqualitycomponents,theclassicalsupplyisstillnomatchfortheMP1.

  • 5

    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 vllig verstehen. Wenn notwendig, nehmen Sie bitte Kontakt auf mit Grimm Audio. Auf Wnsch wird Ihnen eine bersetzung 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 versin Inglesa no ofrece ninguna duda de in-terpretacin y se entiende integramente. Si este no fuese su caso rogamos contacte con Grimm Audio quien, a peticin, se encargara de enviarle la correspondiente traduccin.

    Please follow these precautions when using this product:

    1.Readtheseinstructions.

    2.Keeptheseinstructions.

    3.Heedallwarnings.

    4.Followallinstructions.

    5.Dangerousvoltageisinsidethisapparatus.Openingisonlyallowedbyqualifiedservicepersonnel.

    6.Verifylinevoltagebeforeuse.

    7.Donotdefeatthesafetypurposeofthepolarizedorgrounding-typeplug.Apolarizedplughastwobladeswithonewiderthantheother.Agrounding-typeplughastwobladesandathirdgroundingprong.Thewidebladeorthethirdprongareprovidedforyoursafety.Whentheprovidedplugdoesnotfitintoyouroutlet,con-sultanelectricianforreplacementoftheobsoleteoutlet.

    8.Protectthepowercordfrombeingwalkedonorpinched,particularlyatplugs,conveniencereceptables,andthepointwheretheyexitfromtheapparatus.

    9.Unplugthisapparatusduringlightningstormsorwhenunusedforlongperiodsoftime.

  • 6

    10.Donotusethisapparatusnearwater.

    11.Donotusethisapparatusoutside.

    12.Donotexposetheapparatustodrippingorsplashing.Donotplaceobjectsfilledwithliquids(flowervases,drinkcans,coffeecups,etc)ontheapparatus.

    13.Cleanonlywithadry,soft,non-fluffycloth.Donotsprayanyliquidcleanerontothecabinet,asthismayleadtodangerousshocks.Donotsprayanyliquidcleanerontothefaceplate,asthismaydamagethefrontpanel.

    14.Installinaccordancewiththemanufacturersinstructions.

    15.Donotinstallnearanyheatsourcessuchasradiators,heatregisters,stoves,orotherapparatus(includingamplifiers)thatproduceheat.Avoidexposuretodirectsunlight.

    16.Useonlyattachmentsoraccessoriesspecifiedbythemanufacturer.

    17.Useonlywithacart,stand,bracket,ortabledesignedforusewithprofessionalaudioormusicequipment.Inanyinstallation,makesurethatinjuryordamagewillnotresultfromcablespullingontheapparatusanditsmounting.Ifacartisused,useprecautionwhenmovingthecart/apparatuscombinationtoavoidinjuryfromtip-over.

    18.Thisunitrunsslightlywarmwhenoperatednormally.Operateinanormalventi-latedarea.Ifthisproductwillbeinstalledinarack,makecertainthereissufficientairmovementwithintherack.

    19.Referallservicingtoqualifiedservicepersonnel.Servicingisrequiredwhentheapparatushasbeendamagedinanyway,suchaswhenthepower-supplycordorplugisdamaged,liquidhasbeenspilledorobjectshavefallenintotheapparatus,theapparatushasbeenexposedtorainormoisture,doesnotoperatenormally,orhasbeendropped.

    20.WARNING: Toreducetheriskoffireorelectricshock,donotexposethisappa-ratustorainormoisture.

  • 7

    1. Operation

    Upondelivery,anMP1isfactorysettothetypicalsupplyvoltagesofyourmicro-phonemodel.ThismicrophonetypeisindicatedatthebackoftheMP1.Ifthemicrophonefeaturesremotecontrolofitspolarpattern,thiscanbecontrolledwiththeoptionalknobonthefrontpaneloftheMP1.Thereisamulti-pinXLRcablecon-nectorsuppliedwiththeMP1.Youwillneedtoattachthisconnectortoyourownmicrophonecable(orletyourdealerdothat).Forwiringdata,refertothespecifica-tionschapterofthismanual.PleasemakesureyoudoublecheckifyousolderedtherightwiretotherightXLRpin,yourmicrophonecangetdamagedifyoufailtodoso!

    Ingeneral,weadvisetofirstconnectallcablesandthenturnontheMP1.Bydoingsooneavoidspotentialdamagetotheconnectorsplating.Itisgoodtoknowthatduetocharacteristicsofourshuntregulatorcircuitrythepeakcurrentislimited,whichwilllengthenyourmicrophonestubelife.

    TheMP1isdeliveredwithadetachablefoot.Thiscanberemovedbygentlytwist-ingthefootcounterclockwise.Withoutfeet,twoMP1scanbeconnectedtogethertoformastereo1U19unit.AnMP1generatessomeheat.WhenusingastereosetofMP1sina19rack,itisadvisedtokeeponefreerackspacebelowandabovetoprovideoptimalcooling.

    Technology

    TheMP1featuresaspeciallydesigneddiscreteshunthigh-voltageregulatorfedfromacurrentsourcetomaximisesuppressionfrommainsinducedanomalies.Italsooffersverylownoise(typ.-96dBVor16uV20-20.000Hzunweighted).Moreimportantly,thisshuntsupplysoundsmorenaturalthanthemorecommonlyusedmodernseriesregulators,duetotheabsenseofelectrolyticcapacitorsattheout-put.

    Itwouldhavebeenquickandeasytorelyonindustrystandardvoltageregulatorsfortheheatersupply.However,inquiteafewclassicalmicstheheatervoltageisalsousedtobiasthegridoftheamplifyingtubeinthemicrophone,implicatinganopengatewayfromheatersupplytothesensitiveinputofthemicsamplifyingstage.Wethereforechosetodesignacleanandultralownoisediscretevoltageregulatorfortheheatersupplyaswell.Itfeaturesaverylowdrifttoensuretheheatervoltagealwaysremainswithinspecs.

    Boththehigh-voltageandtheheatersupplieshaveanextracrowbarprotectioncircuitthatwillswitchonincaseoneofthesuppliesbreaksdown.Thisisanextralineofdefencetoprotectthevaluabletubeinyourmicrophone.

  • 8

    2. Modifiying factory settings

    YourMP1isfactorysettothesupplyvoltagesofthemicrophonespecifiedinyourorder.IncaseyouneedtoadjusttheMP1tothesupplyvoltagesofadifferentmicrophone,therearevariousinternalsettingstofacilitatethis.Wehavetowarnyouhoweverthatselectingawrongvoltagewillveryprobablyleadtodamageofthe(sometimesveryexpensive)tube.Sounlessyouareanexperiencedengineerorlikelivingdangerously,wedonotadvisetochangethefactoryvoltagesettings!InanycaseGrimmAudiocannotacceptliabilityfordamagetomicrophones.Forthosepeoplethatstillwanttochangetheinternalsettings,pleasereadthefollowingin-structionscarefully.

    Inappendix1alistcanbefoundofknownmicrophonetypeswiththeirfactoryadvicedsupplyvoltages.Shouldyourmicrophonenotbelisted,pleaseconsulttheoriginalmanufacturer.PleasealsocheckthisMP1manualonGrimmAudiosweb-site,itmighthavehadanupdateofthemicrophonelist.Threepresethighvolt-ageareavailablefromtheMP1:120,145and210V.Thesearesetinternallyusingjumpersandnotbyexternalcontrols,toavoidcostlymistakeswhileamicrophoneisconnected.Atrimpotallowssome(+/-8%)adjustmentofthesevoltages.TheHTsupplyisinherentlyshort-circuitproofasitisashuntsupply.Asanextrasafetyacrowbarcircuitwillshutdownthecurrentsourceincasetheoutputvoltageex-ceedsthenominalvaluebymorethan12%duetomalfunctioning.However,GrimmAudiocannotacceptliabilityincaseofdamagetomicrophonesshouldeventheprotectioncircuitfail.

    Fortheheatervoltagetwopresetvaluesareavailable:6.0and3.9V.Thesevaluesarechoseninconjunctiontowhatisprescribedformostclassicalmicrophones.Theytooaresetbyinternaljumpers.Athirdjumperpositionenablesatrimpotandallowstheheatervoltagetobesetatanydesiredvaluebetween3.6and7.0V.Inaddition,theoutputpolaritycanbereversedassomemicsrequirenegativeheatervoltage.Noiseisverylow:typ.