Mercury Epiphone Valve Junior - Tips for Making Filament Supply Leads

Epiphone Valve Jr.•Mercury Upgrade Kit 37
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.
Tips ’n Tricks for
Making the Filament Supply Leads
Consistent,eventwistingis
important.Ideallyyouwantabout10
twistsperinch.Andbringthetwistof
theleadsascloseaspossibletothe
terminalsthey’llbesolderedto.
TheValve Jr.’soriginalcircuitranthelamentstoDC,we’reconvertingitbacktoAC.Runningthelaments
toDCisacommonenoughtechniqueintendedtoreduceexcessivenoiseproblems.Unfortunatelythis
methodalso“cooks”thetubesandcutstheirworkinglifeuptoaboutathird.Becauseyou’renowusing
qualitytransformers,combinedwithAlan’sreworkingofthecircuit,this“solution”isnolongernecessary.
Theaboveillustrationsshowhowtocreatenewlamentsupplyleadswhichyou’llbeusingtomakethe
conversion.Theleadsarethensolderedintothelocationsindicatedontheschematics.