Ht And Power Supply Ground Wiring - Audio Note L2 Line Preamplifier Instruction Manual

HT and Power Supply Ground Wiring

EXPLANATION: HT is the HIGH TENSION or High DC voltage in the circuit. The most important purpose of the M2
Power supply is to supply this High Voltage level which will be around 260V.
The L2 Board has been designed to support a LEFT and RIGHT High Voltage rail. In our case we will be connecting these
together with the silver wire as you can see in the pictures that follow.
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In order for the 12AU7 tubes on the line board to "light up"
and function properly a filament voltage needs to be
applied to pins 4 & 5 – In this case we are supplying approx
12V DC between these pins.
The one filament supply from the M2 Power supply board
will supply the two tubes on the L2 Line Board.
In the picture opposite you can see the filament wires from
the power supply connecting to pins 4 & 5 with the extra
twisted wire used to connect to pins 4 & 5 of the other tube
– the red black connections are not critical but you can
follow the pictures.
See the following diagram for further clarity.
As shown from the underside of the board you can see the
filament wiring and the location of pin1.
The filaments are wired into pin 4 & 5 – It's a DC voltage
applied but the direction is not critical.
With the Filaments now wired in our next step is to install
the B+ and GND from the M2 Power supply – this is
supplying the High Voltage.
We have tested our Power Supply in the M2 section and
know that we have a working power supply!
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