Caledonian Audio 6BM8/ECL82 SE - Amplifier Boards Detailed Wiring

Caledonian!Audio!
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35!
Amplifier*Boards*Wiring*
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First! of! all,! lets! have! a! look! at! the! amplifier! again! on! Figure! 30! - ! Amplifier! PCB!
revisit.!
!
Table!below!describes!all!the!terminals!on!this!PCB.!
Item!
No.!
Label!
Function!
Connects!To!
1!
“H1”,!“H2”!
Heater! filament!
power! in.! These!
are! the! DC! voltage!
input! for! the! valve!
heater!filament!
“0V”! and! “+V”! on!
the!filament!power!
supply!PCB!
2!
“Pentode!Ground”!
Grounding! the!
pentode! section! of!
the!valve!
Star!ground!
3!
“O/T-“!
Takes! the! output!
from! the! output!
transformer!
“Anode”! on! output!
transformer!
4!
“O/T+“!
Supply! the! B+!
(amongst! others)!
to! the! output!
transformer!
“HT”! on! output!
transformer!
5!
B+!
The! high! voltage!
input! for! the!
amplifier!board!
“B+! out”! on! the!
main!power!supply!
PCB!
6!
“Pentode!Ground”!
Grounding! the!
triode! section! of!
the!valve!
Star!ground!
7!
“NFB”!
Provides! feedback!
from!the!secondary!
winding! of! the!
output!transformer!
into! the! audio!
amplifier!circuit!
Speaker! out!
positive/hot!
!
Now!lets!start!with!the!wiring.!Please!refer!to!Figure!29!-!Amplifier!Board!Wiring.!!
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These!terminals!should!already!by!now,!been!connected!to!the!filament!power!
supply!board.!If!not,!please!refer!back!to!section:!Heater!Filament!Power!Cables.!
!
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Simply!connect!to!the!star!ground.!In!the!example!below,!a!single!core!insulated!
copper!core!cable!is!used!