Mercury Epiphone Valve Junior - Final Wiring Steps (With 6 V6 Option); Critical Next Step Warning

Epiphone Valve Jr.•Mercury Upgrade Kit 33
ThisprojectanditsdocumentationistheresultoftechnicalinvestigationsmadebytheengineeringstaffofMercury Magnetics.Thedisclosureoftheinformationhereinmaypertaintoproprietaryrightsand
thefurnishingofthesedocumentsdoesnotconstituteanexpresedorimpliedlicensetousesuchmaterials.
FINAL WIRING (with the 6V6 option)
Withthe6V6socketinplaceandwiredup(butnot
connectedtotheMainPCB,let’swrapthingsup:
Threadthevarioustransformerleadsthroughthe
holesasindicatedinthediagrams.
Soldertheorangelamentleadsfromthe6V6into
positionsattheV2tubesocket.Notethatthese
leadsmustbetightlytwisted(seeappendix).
Soldertheredleadfromthe6V6’spin4tothe
farleftterminalofR12(thesideclosesttothe
sockets).
Soldertheblueleadformthe6V6’spin6tothefar
leftterminalofR5(thesideclosesttothesockets).
Soldertheyellowwirefromthe6V6’spin3topin7
ofsocketV2.
SoldertheOT’syellowprimaryleadtopin3ofthe
6V6.
SolderthetwoorangelamentleadsofthePTinto
pins2and7ofthe6V6socket.Notethatthese
leadsshouldbetightlytwisted(seeappendix).
SoldertheOT’ssecondarygreenandblackleads
tothespeakerjackasindicated.
SoldertheOT’sprimaryblackleadtoT4ofthe
MainPCB.
SolderontoT1andT2theredleadsfromthePT.
SoldertheblackandyellowPTleadsontotheOn/
Offswitch.
Soldertheorange/white-stripedcentertaplead
fromthePTandthegroundchassisleadtothe
backoftheboard(seespecialinstructionpage).
SoldertheMini-Chokesleadstothelocations
designedontheMainPCB.
Connecttheinputjackandvolumecontrolleadsto
theirjacksontheMainPCB.
BolttheMainPCBbackintothechassis.
Triple-checkyourmodications.Ifyouhaveany
questionsthetimetogetthemansweredisnow.
CallMercuryifyouareindoubtaboutanything.
Finishre-assemblingtheunit,includingreinstalling
thetubes,puttingthechassisbackinthecase,
hookingupthespeaker,etc.
DO NOT BYPASS THIS NEXT STEP!
Aftertriple-checkingyourassembly,connectthe
amp’spowertoaVariac,orevenbetter,avariable
ACpowersupply,andfollowthetesting/start-up
proceedureasoutlinedinthismanual’sappendix.
Debugifnecessaryandrepeatthisprocess
untilyouaresatisedthattheUpgradedampis
workingcorrectly.
Whentheampisworkingtoyoursatisfactionuse
thecableties(supplied)togroupandholdthe
variouswiresawayfromtheMainPCB(especially
thetubes).Inparticular,gatherupFilament
SupplyLeadstyingthemasclosetothepower
transformeraspossible.Seenalphotographsfor
examples.
ApplyLoctite 290(green)tothetworetainingbolts
andscrewsoftheMainPCB.
ApplytheMercurymetalplacetoproperlyI.D.
yourMercury Upgraded amp.Andyouaredone!