Audio Note L2 Line Preamplifier Instruction Manual page 37

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We are now going to take the 3 pairs of twisted wires that
are already connected to the M2 Power Supply Board and
connect these directly to the SECONDARY of the Mains
transformer.
Start by taking the RED / RED twisted pair and trim to a
good length and then solder to the '300' lugs on the Mains
transformer. I would suggest stripping the insulation off the
end of the red wires and tinning. Then place the tinned lead
through the lug on the Mains transformer and then apply
solder – it is not necessary to twist the lead around the
post.
Also, take the earth wire (Cable #6) and connect one end to
'0' and the other end connect to the chassis GND lug.
Next step is to take the Red/Black twisted wire that is
connected to the 8-pin octal valve base.
For the 6X5 – this is the filament wire which will be supply
6.3V to the 6X5 and ECL82 tubes on the M2 power supply.
Page 37