Caledonian Audio
6BM8-ECL82-SE-Classique Assembly Manual
45
45
Amplifier Boards Wiring
First of all, let’s have a look at the amplifier terminals on the amplifier board which
we are working on. 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-]
Return path from
the output
transformer
[Anode] on output
transformer
4
[O/T+]
Supplies the B+
(amongst others)
to the output
transformer
[HT] on output
transformer
5
[B+]
The high voltage
input for the
amplifier board
[B+] 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
By referring to Figure 36, start connecting the following terminals.
Please pay some attentions on the B+ wiring. There are two ways of wiring the B+.
First is to run two separate cables from the [B+] terminal on the main power
supply board to the two amplifier boards. Another way is to run only one cable to
one of the amplifier board [B+] terminal and another cable to connect the two
amplifier board [B+] terminals together.
In this manual, we will be using the second method which it is a tidier method (less
cables as seen in Figure 36). However, this comes at the cost of doubling the
Summary of Contents for 6BM8/ECL82 SE
Page 1: ...Assembly Manual 6BM8 ECL82 SE 2 5W Classique MKII Version 3 0 Caledonian Audio ...
Page 6: ...6 ...
Page 10: ...10 Figure 2 Filament supply board with the four diodes ...
Page 16: ...16 Figure 8 Main power supply PCB fully populated ...
