Caledonian Audio 6BM8/ECL82 SE Manuale utente

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Version!3.0!

Caledonian!Audio!

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Version!

Date!

Changes!

0.1!

1st!of!May!2018!

Initial!creation!

1.0!

1st!of!Nov!2018!

Reviewed!and!accepted!

2.0!

4th!of!June!2019!

Updated!against!a!review!

3.0!

25th!of!October!2019!

Now! for! 6BM8! PCB!

Version!C!for!MKII!

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Caledonian!Audio!

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The! work!conducted! here! deals! with! high-level!voltages.! It! should! only! be!

conducted!by!:,*&9M9#N!personals.!

Please!be!aware!that!O*P*O9A?>"!can!hold!charges!for!a!long!time!and!they!should!

be!properly!N9"OQ*>R#N!prior!to!any!work.!

The!6.3V!or!12V!terminals!are!rated!in!relation!to!another!voltage!reference!level,!

but! in! reality,! the! potential! difference! between! the! 12V! (as! an! example)! and!

ground!earth!might!be!anywhere!up!to!400V.!So,!please!treat!any!6.3V!or!12V!

terminals!with!#SA>#$#!care.!

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Introduction!...........................................................................................................................................!7!

Assembly!Instructions!..................................................................................................................!8!

PCBs!Preparation!.................................................................................................................................!9!

Heater Filament PCB!......................................................................................................................!9!

Main!Power!Supply!PCB!...........................................................................................................!11!

Stuffing!the!Amplifier!PCBs!.....................................................................................................!18!

Socket!Soldering!......................................................................................................................!18!

Components!Soldering!.........................................................................................................!20!

Mounting!Components!...................................................................................................................!22!

IEC!socket!........................................................................................................................................!24!

Power/Main!Transformer!.......................................................................................................!25!

Audio!Output!Transformers!...................................................................................................!26!

PCBs!...................................................................................................................................................!27!

Speaker!and!Audio!Input!(phono)!Connectors!...............................................................!28!

Potentiometer!and!Potentiometer!PCB!.............................................................................!29!

Wiring!....................................................................................................................................................!30!

Power!Cables!.................................................................................................................................!33!

Safety!Earth!...............................................................................................................................!33!

IEC!to!Power!Switch!..............................................................................................................!34!

Power!Switch!To!Power!Transformer!...........................................................................!34!

Power!Transformer!to!Main!Power!Supply!PCB!.......................................................!35!

Main!Power!Supply!PCB!(B+)!to!Amplifier!Boards!(B+)!........................................!36!

Heater!Filament!Power!Cables!.........................................................................................!38!

Audio!cables!wiring!....................................................................................................................!40!

RCA!Terminals!to!Potentiometer!PCB!...........................................................................!41!

Potentiometer!PCB!to!Amplifier!PCB!.............................................................................!41!

Potentiometer!PCB!to!Amplifier!PCB!.............................................................................!43!

Amplifier!Boards!Wiring!.....................................................................................................!45!

Speaker!Output!Wiring!........................................................................................................!47!

Assembly!Completion!.....................................................................................................................!49!

Powering!Up!For!The!First!Time!...............................................................................................!50!

Questions!/!Support!........................................................................................................................!52!

Appendix!..............................................................................................................................................!53!

I.!Screws!/!Nuts!/!Bolts!Sizes!............................................................................................!53!

II.! Amplifier!PCB!Components!...........................................................................................!54!

III.! Main!Power!Supply!PCB!Components!.................................................................!54!

IV.! Heater!Filament!PCB!...................................................................................................!54!

V.! Schematics!............................................................................................................................!55!

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Figure!1!-!Filament!supply!board!with!the!four!diodes!......................................................!9!

Figure!2!-!Filament!supply!board!with!the!four!diodes!...................................................!10!

Figure!3!–!Main!power!supply!PCB!with!C4!capacitor!and!the!bleeder!resistor,!R5

!........................................................................................................................................................!11!

Figure!4!–!Main!power!supply!PCB!with!two!diodes!........................................................!12!

Figure!5!–!Main!power!supply!PCB!with!all!diodes!installed!........................................!13!

Figure!6!–!Main!power!supply!PCB!with!all!radial!capacitors!......................................!14!

Caledonian!Audio!

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Figure!7!–!Main!power!supply!PCB!with!all!dropper!resistors!installed!.................!15!

Figure!8!-!Main!power!supply!PCB!fully!populated!...........................................................!16!

Figure!9!-!Main!power!supply!PCB!fully!populated!-!another!angle!..........................!17!

Figure!10!-!amplifier!PCB!showing!the!socket!side!...........................................................!18!

Figure!11.!Valve!socket!soldered!to!the!amplifier!board!................................................!19!

Figure!12!-!Amp!PCB!fully!populated!......................................................................................!20!

Figure!13!-!Amp!PCB!socket!side!with!a!valve!inserted!...................................................!21!

Figure!14!-!two!amplifier!PCB!completed!together!with!ECL82!valves!inserted!

(illustration!only)!...................................................................................................................!22!

Figure!15!-!Placement!of!all!components!on!the!mounting!bard!-!bottom!view!..!23!

Figure!16!-!the!complete!system!–!bottom!view!.................................................................!24!

Figure!17!-!Example!of!IEC!socket!installed!..........................................................................!24!

Figure!18!Mounting!the!main!transformer!...........................................................................!25!

Figure!19!-!Mounting!the!audio!transformers!.....................................................................!26!

Figure!20!-!example!of!PCB!being!mounted!on!the!standoff!.........................................!27!

Figure!21!-!speaker!and!audio!input!connectors,!and!star!earth!lug!.........................!28!

Figure!22!-!potentiometer!and!PCB!mounted!......................................................................!29!

Figure!23!-!Wiring!Diagram!-!USA!(120VAC)!.......................................................................!31!

Figure!24!-!Wiring!Diagram!-!UK!(240VAC)!..........................................................................!32!

Figure!25!-!Ground!safety!earth!from!IEC!socket!wired!to!the!chassis!and!secured!

by!shakeproof!washer!and!insert!lock!nut!..................................................................!33!

Figure!26!-!Live!(brown)!and!neutral!(blue)!cables!connecting!the!IEC!socket!to!

the!power!switch!....................................................................................................................!34!

Figure!27!-!Live!(brown)!and!neutral!(blue)!cables!from!the!power!switch!

supplying!main!power!to!the!power!transformer![0V,!240V]!............................!35!

Figure!28!-!Two!cables!(brown)!connecting!power!transformer!secondary!

terminals![0-250V]!to!the!main!power!supply!PCB![AC!IN].!!The!green!cable!

is!the!ground!level!cable!connecting!the![0V]!to!the!star!ground.!Note!the!red!

cable!carrying!B+!voltage!from!the![B+]!terminals!on!the!PCB!to!the!two!

amplifier!boards.!.....................................................................................................................!36!

Figure!29!-!Completed!main!power!supply!board!wiring!...............................................!37!

Figure!30!–!Twisted!cables!(red!and!black)!connecting!power!transformer!

secondary!terminals!(6.3V,!0V)!to!the!filament!power!supply!PCB!(AC!+/-!

IN)!..................................................................................................................................................!38!

Figure!31!–!Two!pairs!of!black!and!red!cables!(+V!and!0V)!feeding!the!two!

amplifier!boards.!The!green!cable!connecting!the![0V]!terminal!on!the!

filament!power!supply!PCB!and!the!star!ground!point.!The!polarity!of!the!H1!

and!H2!terminals!do!not!matter.!......................................................................................!39!

Figure!32!-!Heater!cables!coming!connected!to!the![H1]!and![H2]!terminals!on!

the!amplifier!boards.!.............................................................................................................!40!

Figure!33!-!Potentiometer!on!its!IO!PCB!................................................................................!42!

Figure!34!Connecting!the!RCA!input!connectors!to!the!potentiometer!IO!PCB!....!43!

Figure!36!-!Connecting!the!potentiometer!IO!PCB!to!the!amplifier!PCB.!In!this!

example!a!screen!cable!is!used.!Note!how!only!one!end!of!the!screen!is!

soldered!to!the![Audio!In!-]!terminal!.............................................................................!44!

Figure!37!-!Amplifier!Board!Wiring!..........................................................................................!47!

Figure!38!-!connecting!the!output!transformer!to!speaker!terminals!......................!48!

Figure!39!-!Complete!wiring!and!components!assembly!................................................!49!

Figure!40!-!Schematics!...................................................................................................................!55!

! !

Caledonian!Audio!

-.)/B123/4B51B2&*""9:,#(!""#$%&'()*+,*&(

Introduction

Congratulations! and! thank! you!for! purchasing! on! this! kit.! This! guide! enables!

readers!to!build!and!assemble!the!6BM8/ECL82!SE!Classique!MkII!DIY!amp!kit.!

The!6BM8/ECL82!SE!is!a!pure!Class!A!Single!Ended!valve!amplifier!that!uses!a!

two-stage!amplification!-!single!valve!per!channel!topology.!

Its!features!include:!

• 2.5W!-!Pure!Class!A!per!channel!output!

• Single!ended!topology!

• Fast!Silicon!Carbide!Schottky!Diode!and!audio!grade!Electrolytic!Capacitor!

for!power!supply!producing!well!filtered!DC!power!

• DC!heater!filament!supply!

• Quality!electronic!components!

If!you!have!any!questions,!please!get!in!touch!with!us!at:!

[email protected].!!

We! also! value! any! feedback! that! you! might! have! after! going! through! this!

document.!

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• Heater!filament!PCB!Version!A!

• Main!power!supply!PCB!Version!A!

• Amp!PCB!6BM8!PCB!Rev!C!

• Alps!RK27!I.O.!PCB!Version!B!

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1. Only!parts!and! devices,! which! are! part! of! this! kit,!are! used!in! the! build.!

Caledonian!Audio!will!not!support!usage!of!any!other!parts!or!components!

other!than!supplied!and!mentioned!by!us!in!this!document!

2. The!supplied!aluminium!mounting!board!is!used!

3. Reader!is!capable!of!performing!wiring!/!soldering!and!understands!risks!

of!fatal!level!of!voltages!!

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• Screwdrivers!(multiple!sizes)!

• Long!nose!pliers!

• Soldering!iron!(with!solders!etc.)!

• Wire!cutters!

• Wire!strippers!

• Heat!shrinks!

• Cables!/!wires!for!hookups!and!power!lines!(please!see!wiring!diagram!for!

exact!ratings!and!colour!codes!

• Fuse!–!5x20mm!–!250VAC!–!1!Amp!slow!blow.!(This!is!to!be!added!to!the!

fuse!slot!in!the!IEC!socket)!

Assembly Instructions

The!general!assembly!plan!is!as!follows:!!

1. Prepare!all!PCBs!(Power!supply,!heater!supply!and!2!x!amplifier!boards)!

2. Mount!power!transformer!onto!mounting!board!

3. Mount!audio!output!transformers!onto!mounting!board!

4. Mount!all!connectors!(power!and!audio)!

5. Mount!potentiometer!(and!its!I.O!PCB)!

6. Install!power!cables!

7. Install!audio!/!hookup!cables!

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Caledonian!Audio!

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PCBs Preparation

Heater Filament PCB

Place and solder the four diodes (D5, D6, D7 and D8); note the polarity of the

Diodes. See Figure!1. Use the marking on the PCB as a guide.

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Now place and solder the two reservoir capacitors C5 and C6. See Figure!2. Please

note the polarity of the two capacitors. The PCB is now complete.

10!

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