Version 1.32
11
Original transformer layout.
The new transformer, although now larger, is designed for longer life.
Next connect the high-tension wires, which are enclosed in a fibre sleeves. The black
and white go to points X15 and X16 on the power supply board and supply 460V AC
from 240V AC mains. The other two wires brown and red are not used and need to be
cut back to approx 5cm and their ends covered with a small piece of heat shrink
tubing (supplied) to insulate them. It is not necessary to keep them in phase. The
brown and red wires are not used in this amplifier. The rest of the transformer wires
connect to the heaters when the amplifier is finally assembled, apart from the orange
and green pairs which are not used.
Mounting The Audio PCB In The Front Chassis Panel:
Before the Audio PCB’s are fitted, the octal valve bases for the EL34 power valves
must be attached to the front chassis panel using two M3 screws, an M3 nut, and a
12mm stand-off for each base. The two outer valve bases have the spacer on their
outer sides, and the two inner valve bases have their spacers on their inner most sides.
This is to support the PCBs properly. The valve bases mount directly under the
chassis panel with the valve orientation slot to the right of the amplifier when viewed
from the front top. Then, using the remaining 12mm stand-off’s fix the front row of
the PCB to the chassis using M3 countersunk screws in the appropriate holes.
The two PCB’s can now be fitted to the front chassis panel. For ease of fitting the
screws holding the pillars may need loosening (these are pre-mounted on some
chassis).
