Version 1.32
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Figure 1. Mains socket switch connections
Figure 2 below shows the different windings on the mains transformer, not all of them
are used. Connect the mains transformer starting with the primary side that contains
two pairs of 115V windings.
For 220V/240V mains:
Solder the interior blue and brown wires together and fold them over to leave them
approximately 5cm in length. Seal them with a length of heat-shrink sleeving so that
no bare wires are exposed. The exterior brown and blue wires from the transformer
solder to points 2 and 5 on the mains switch as shown in the above diagram. Note: the
blue wire goes to the left, and the brown to the right when viewed from the front of
the amplifier. Cable-tie the four wires together to keep them tidy. All a.c. wires should
be twisted together in a reasonably tight twist (this helps avoid hum).
For 110V/120V mains:
Solder the two blue wires together as one pair, and the two brown wires together as
the other. Now solder the pairs to points 2 and 5 with the blue/white combination to
the left, and the brown/grey to the right when viewed from the front. Cable-tie the
four wires together to keep them tidy. Again all a.c. wires should be twisted together
in a reasonably tight twist (this helps avoid hum). In this case the brown/blue pairs
should be twisted together first and then the two twisted pairs twisted to each other
