Caledonian Audio 6BM8/ECL82 SE - Page 5

Caledonian!Audio!
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Figure!18!-!Two!cables!(brown)!connecting!power!transformer!secondary!
terminals!(250V!-!0)!to!the!main!power!supply!PCB!(AC!IN).!!The!
green/yellow!cable!is!the!ground!level!cable!connecting!the!0V!to!the!star!
ground.!Note!the!twisted!red!cables!carrying!B+!voltages!from!the!B+!
terminal!on!the!PCB!to!the!two!amplifier!boards.!....................................................!27!
Figure!19!-!Completed!main!power!supply!board!wiring!...............................................!28!
Figure!20!-!Twisted!red!cables!carrying!B+!voltage!into!the!two!amplifier!boards
!........................................................................................................................................................!28!
Figure!21!-!Two!cables!(red!and!black)!connecting!power!transformer!secondary!
terminals!(6.3V,!0V)!to!the!filament!power!supply!PCB!(AC!+/-!IN)!................!29!
Figure!22!-!Green!cable!connecting!the!0V!terminal!on!the!filament!power!supply!
PCB!and!the!star!ground!point.!The!black!sleeve!contains!four!wires!carrying!
the!6.3VDC!line!(two!positives!and!two!negatives)!from!the!filament!power!
supply!to!the!H1!and!H2!terminals!on!both!amplifier!boards.!The!polarity!on!
the!H1!and!H2!do!not!matter!at!all,!as!long!as!one!receives!a!positive!voltage!
and!the!other!receives!negative!voltage.!......................................................................!30!
Figure!23!-!Completed!wiring!for!filament!supply!PCB!...................................................!30!
Figure!24!-!RCA!to!potentiometer!connections!...................................................................!31!
Figure!25!-!Single!core!insulated!copper!wire!used!for!ground!connections!.........!32!
Figure!26!-!Potentiometer!wiring!..............................................................................................!33!
Figure!27!-!Potentiometer!wiring!-!another!angle!.............................................................!33!
Figure!28!-!Audio!input!cables!going!into!the!amplifier!board!.....................................!34!
Figure!29!-!Amplifier!Board!Wiring!..........................................................................................!36!
Figure!30!-!Amplifier!PCB!revisit!...............................................................................................!37!
Figure!31!-!connecting!the!output!transformer!to!speaker!terminals!......................!38!
Figure!32!-!Complete!wiring!and!components!assembly!................................................!39!
Figure!33!-!Schematics!...................................................................................................................!44!
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