Version 1.32
7
Power Supply PCB Assembly Instructions:
Insert and solder resistors R19, R20, R33, and R34, as well as diodes D1 to D4
observing their polarity. Solder R35 approximately 7mm above the board (this resistor
uses the Blue PTFE sleeves to mount it off the board as it can run warm in use).
Solder the terminal pins X15, X16, X17, and X18. Lastly, solder in the four
electrolytic caps C7, C8, C14, and C15 observing the correct polarity.
IT IS A GOOD IDEA TO THOROUGHLY CHECK THE CIRCUIT BOARDS FOR
ANY SOLDER JOINTS THAT HAVE BEEN MISSED OR LOOK DRY, AS THIS
COULD CAUSE A LOT OF PROBLEMS LATER.
Assembly of The Bottom Chassis:
Fit two of the mounting feet in the holes nearest the back of the chassis using an M4
screw and nut for each one - please note, the chassis panels may need drilling out to
allow the M4 screw to fit. Fit the loudspeaker terminals, two red and two black, on
each side of the chassis; for ease of wiring fit the black terminal(s) on the left of each
set when viewed from the front panel facing you. Note: current output transformers
now have three output pins instead of four. The forth pin that was a 2-Ohm tap is not
required and its removal has increased the frequency response of the output
transformer. For this reason it is a good idea to wire the speaker terminals for two
black and two red on each side, and join these to allow for bi-wiring and a better
sound. If the reds are on the inside of the two blacks, you can either wire for 4 and 8
ohm or just wire for 2 x 8 ohm. generally it will be found that for speakers down to 4
ohms or up to 14-16 ohms the 8 ohm tapping will prove to be the best sounding
output, but do try both and form your own opinion for this. Mount the three pairs of
RCA input sockets to the chassis with M3 screws and nuts; Note: the black sockets
are for the left channel and should be mounted at the top. Push in the mains switch,
and the mains socket with the fuse at the bottom.
When fitting any output transformer scrape the varnish off its underside, (top has the
pins on) and the paint from the chassis to ensure a good grounding in at least one
screw hole position. Now fit the transformers with M4 screws and nuts. The primary
