Section 7: Wiring Up The Line Stage; Filament Wiring - Audio Note L2 Line Preamplifier Instruction Manual

Section 7: Wiring Up the Line Stage

Filament Wiring

Filament Wiring Note
If you are building the L2 pre-amp as a LINE ONLY and never plan to use a PHONO section then you can use a separate
filament pair from the M2 power supply for each tube valve base.
If you are building a L2 Line with Phono then you will just use one filament supply for the L2 line board and you will use a
twisted wire to "parallel" the voltage to both tubes at the same time.
The instructions that follow assume that you are going to parallel the line board filaments as if you are going to build with
an additional phono board. This is also a good method if you may intend to add a phono board in future.
The first thing we are going to do is to take one of the 6V2 filament wires from the M2 power supply and we are going to
connect it to the L2 Line Board – You will have a little extra wire length so I suggest you trim it but leave yourself some
extra room as you will be flipping the board over afterwards and we will use the extra piece to 'parallel' the two valve
bases.
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Position the L2 Line Board into the chassis – Don't screw
into position but place it in the correct orientation.
As you can see, the input side of the Line Board is closest
to the front of the chassis – the signal will travel from front
towards back of chassis.
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