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Page 41
Section 12: Driver Board Filament Hook-up
EXPLANATION: The filament wiring is basically AC right
off the Mains secondary – these filament wires go to the
EL34 hardwired board and then connect down to the
ECF80 board for each channel.
In order to have a very quiet amplifier, however, we need to
have the AC voltage 6.3V raised up about 30V DC – We do
this by connecting a single wire from the Power supply
board FIL_DC over to the FIL FIL section on the ECF80
driver board.
Connect the end of the Orange wire to the FIL_DC pad in
the Power Supply board.
So what you need to do is bring the twisted filament wires
from the Hardwired board over to the ECF80 board along
with the Orange wire from the power supply board FIL_DC.
But read on to see what else you have to do with this step
as you need to add one more wire...
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