AM 833S User manual

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833SMonoblockAmplifierManual.

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CongratulationsonyourpurchaseoftheAMMusic833S,PureClassA,SingleEnded

Monoblocks.YouarenowtheownerofoneoftheWorld’sfinestamplificationsystems.This

amplifieristheculminationof14yearsofcarefulresearchanddevelopment,inthesearchof

themythicallyperfectamplifier.Webelievedthatwehaveachievedthiswiththisamplifier.

Unpackingandassembly:

Carefullyremovertheamplifiercomponentsfromtheircartons.Themodulesareveryheavy

andcareshouldbetakentonotdamagetheamplifierorcauseyourselfinjuryinliftingthem.

Havingtwopeopleavailableisadvisable.

Carefullyunpackthe833tube.Thetubemounthastwothumbscrewstosecurelyholdthetube

inplace.Thisisaccessedbyunscrewingthe4chromeknobsoneachcornerofthetube

surround.



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Removethe4screws(asshown)andcarefullyliftthe

surroundbyabout8cmtoalloweasyaccess.

(Asshownbelow)

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

Insertthe833tube,makingsurethatitisinasfaras

itwillgo,andfirmlytightenthetwothumbscrews.

Replacetheassemblyandrefitthe4screws,

tighteningthemuntiltheyarefirm,butdonotover

tighten.

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

FitthetwoTefloncapstotheelectrodesontopof

thetube.UsinganAllankey,tightenthegrubscrew

asshowntoensurethatthecapissecuredtothetop

ofthetube.(Seefollowingwarningonnextpage)

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WARNING.

TheAMMusic833Sdoesnotrunattheexcessivelyhigh

voltagesofsomeotherSuperAmps,but thereis900Vpresentatthetopcaps,

whentheamplifierisswitchedon.Thisvoltagecanbeextremelydangerous,

andifthecapisremovedwheninoperation,asevereelectricshockispossible.

Itisthereforeveryimportantthatthecapsaresecuredbydoingupthegrub

screwtopreventanyinexperiencedpersonremovingthecap.Ifproperly

secured,itiscompletelysafe

.Thevoltagedropstozeroassoonasthepowerisswitched

offandthegreenoperatinglightisoff.

Ensurethatthepowerisoffandthepower

leadisremovedbeforeattemptingtoremoveoraccessthetube.

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Connectthetwoumbilicalcordsbetweeneachamplifierandthecorrespondingpowersupply.

Theseleadsare1.5minlengthandtheamplifiersectioncaneitherbeplacedontopofthe

powersupply,orwhereverelsesuitsinyourinstallation.

 

Eachplughasseveralguideridgesonit.Thereisonethatismuchthickerthantheothers.(As

seeninrighthandphotograph)Thisoneisalwaystothetop,ortowardstheamplifieronthe

amplifierend.Thismakesfindingthecorrectorientationmucheasier.

On/offswitch:

Theon/offswitchofeachamplifierisontherearofeachpowersupply,ontherightandside

(asviewedfromthefront.)

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DriverTubes:

FittheECC88andKT88DriverTubes.Besuretoensurethatthepinorientationiscorrectand

donotforcethem.TheKT88hasakeywayonthebaseandwillonlyfitoneway.Linethekey

onthetubewiththeslotinthetubesocket.Donotrockthetubeexcessivelyinthesocketto

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fitorremoveit,astheguideisBakeliteandiseasilybrokenoff.Thiswillnotaffectthe

operationofthetube,butitmakesfittingdifficult,andifthetubeisfittedincorrectly,amplifier

damage

will

occur.

ConnecttheamplifiertoyourHiFiSystem.Ifindoubtastowhethertousethe4or8ohmtaps

ontheamplifier,startwiththe8ohm.Justbecauseaspeakerisratedat4,6or8ohmsdoes

notnecessarilymeanthatistheloadseenbytheamplifierwhenplayingmusic.Whenthe

amplifierhasbeenbiasedandiswarm,listentosomemusicandthenconnecttothe4ohm

tapsandlistentothesamepieceagain.Theonethatsoundsfuller,strongerandmoremusical

isthecorrectsetting.Havingitontheincorrecttapswillnotdamagethespeakersorthe

amplifier.

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Biasing:

Thebiasingontheamplifierwasreducedpriortoshippingasasafetymeasure.

Oncetheamplifierhasbeenonforawhileandisfairlywarm,connectaMultimetertothered

andblackbiasingterminalsontherightsideoftheamplifier.(Asseenfromthefront).



SettheMeteronDCVolts,andadjustthescrew

betweenthetwoplugsuntilitreads2.2V.

Repeatontheotheramplifier.

Afteraboutamonthormoreofrunning,or

about200hours,checkandresetthebias.After

this,thereisnorealneedtokeepcheckingit,

unlessthetubeisreplaced,asthebiaswill

naturallydriftasthetubeages.



Theseamplifiersgiveoffquitealotofheat,sopleaseensurethateachonehasadequate

ventilation



Warranty:



ThewarrantyonallAM productsistwoyearspartsandlabor.Theamplifiermustbereturned

tothefactory,ortothedealerfromwhichitwaspurchased,ortoarepairerauthorizedbythe

factoryorthedealer.Thewarrantyontubesis3monthsfrompurchase.Ifatubelasts3

months,thenitismostlikelytolastthenormallifecycle.



Pleasecontactyourdealerifyouhaveanyotherquestionsorifyouwouldlikeanyinformation

onother

products.

AMwishesyoumanyyearsofveryhappylistening.Thankyou.



Dataspecifications:

PowerTube833

TubecomplementECC88asthedrivers,KT88astheamplifiers.833

Frequencyresponse 20Hz‐100KHz

InputImpedance 100kohms

Inputsensitivity1.0Vrms

S/N >98dB

Inputselections RCAsingle‐ended;balanced/XLR

PowerOutput 120w

Loadimpedance 4&8ohms

Powerconsumption400W(each)

Powersupply 100,110,120,220,230,240VAC50‐60Hz

Dimensions(W*D*H) amplifier340X450X292(mm)‐powersupply340X450X200(mm)

Weight amplifier30.7kgx2.powersupply44.7kgx2...



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AM 833S User manual

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