1920
q Now to configure the secondary windings for the desired speaker
load, please first refer to the following chart .
4 Ohm Speaker Impedance
Wi re Colours Connections To
White & Bro w n Spkr + (RED)
Black & Gre e n Spkr - (BLK)
Blue & Ye l l o w each other with special
twist connector
8 Ohm Speaker Impedance
Wi re Colours Connections To
White & Ye l l o w Spkr + (RED)
B l a c k Spkr - (BLK)
Blue, Green & Brown each other with special
twist connector
16 Ohm Speaker Impedance
Wi re Colours Connections To
W h i t e Spkr + (RED)
B l a c k Spkr - (BLK)
Blue & Ye l l o w each other with special
twist connector
G reen & Bro w n each other with special
twist connector
General Instructions:
q Neatly group the wires as they enter the chassis through the access
hole and twist them together into a spiral. If you are a ‘hot shot’ with
the drill, go for it. Otherwise use your fingers.
q Trim these leads to a length no longer than 4.5” (113mm), strip the
teflon jacket 3/8” (9.5mm) from all the ends and only tin the wires that
will be terminated to one of the speaker binding posts. (See the chart
a b o v e ) .
q Use a 3” Cable Tie about 1.5” (38mm) from the end of the wires to
hold the gro u p .
q A c c o rding to the chart above, twist the conductors together and
solder them to the appropriate speaker post. Or if the lead gets
connected to another lead and not a binding post terminal, twist them
t o g e t h e r, and then use one of the special twist connectors to firm l y
hold the wires together. CUE: If you are connecting 3 wires, (i.e. 8
Ohm setup), then use the larger twist connector. You may solder this
connection first if you feel uneasy about using this reliable, high-forc e
connection device.
Chassis Wiring (Part 2):
Power Transformer:
Input AC Voltage Configuration:
This kit allows you to configure the amplifier to be used with an AC
s o u rce ranging from 100VAC to 240VAC. You will choose from one of
five diff e rent nominal voltage settings.
In a nutshell, there are two primary windings in the power transform e r.
In a basic parallel connection the transformer will be set for 120VA C
nominal line voltage or a slight variation to the theme will allow for a
nominal voltage of 100VAC. Expanding on this, if we set the primaries
in series, certain combinations will allow operation with 200VA C ,
2 2 0 VAC or 240VAC as a nominal input AC voltage.
In this same sequence of instructions you will be connecting and
installing the AC SW PCB.
Oh good, I just re m e m b e red that I enjoy preparing these transform e r
windings. This is where I use my power drill to spin and twist the wire s
together to make very uniform snuggly twisted pairs. It adds that
‘ p rofessional’ look.
Connection of Power Transformer Primary Wi r e s :
q You may go directly to jail... no no, go straight to the section that
describes the setup for your particular AC line voltage. (We’ll see if you
did something wrong later and decide your consequences then!)
q 3/16” Heatshrink tubing 1/2” (13mm) x 2
q 1/8” Heatshrink tubing 1” (25mm) x 2
q AC SW PCB x 1
q #6-32 1/4” Philips screws x 2
q #6 lock washers x 2
100V operation:
q Snuggly twist the BLACK and BROWN wires together.
q Snuggly twist the WHITE and ORANGE wires together.
q Snuggly twist the BLACK/WHT and BROWN/ORG wires together.
q P re p a re and trim the BLK/WHT & BRN/ORG pair of wires to 9”
( 2 3 0 m m ) .
q Locate the AC SW PCB, and on it you will see the label “OUT” and
two solder pads.
q I n s e rt the BLK/WHT & BRN/ORG wires into these pads from the top
and solder them from the re a r, trim any excess leads.
q Trim the WHITE & ORANGE pair of wires to 9” (230mm). Strip 3/8”
(9.5mm), twist together, and lightly tin these wire s .
q Slide a piece of heatshrink tubing onto this pair of wire s .
q This pair of WHT & ORG wires are then soldered to the IEC AC
module, to the pin labeled ‘N’ (middle terminal). I know that you will
not be able to see this very will so observe the photo.
q Once soldered on, slide the heatshrink tubing over this connection
and shrink it into place.
q Two down and one to go. The last remaining pair do not connect to
anything, not even each other. The truth of it is though, these wires will
be live and must be treated with care to prevent an electro c u t i o n .
q On the BLACK & BROWN wires are trimmed to 9” (230mm), more
than cutting off any of the exposed wire lead ends.
q Slide a piece of 1” (25mm) long small heatshrink tubing (1/8”), onto
each wire end, but only half way. Shrink the tubing in place and fold
the loose end back against the wire. Take another piece of 1” (25mm)
long 3/16” tubing and slide it over BOTH of these wires to couple the
ends together.
q You have rolled the dice, please advance down to ‘STICKY Pad
P l a c e m e n t ’ .
120V operation:
q Snuggly twist the WHITE and ORANGE wires together.
q Snuggly twist the BLK/WHT and BRN/ORG wires together.
q Snuggly twist the BLACK and BROWN wires together.
q P re p a re and trim the BLACK & BROWN pair of wires to 9” (230mm).
q Locate the AC SW PCB, and on it you will see the label “OUT” and
two solder pads.
q I n s e rt the BLACK & BROWN wires into these pads from the top and
solder them from the re a r, trim any excess leads.
q Trim the WHITE & ORANGE pair of wires to 9” (230mm). Strip 3/8”
(9.5mm) and twist them together and lightly tin these wire s .
q Slide a piece of 1/2” long 3/16” heatshrink tubing onto these wire s .
But don’t let it slide down into the transformer below.
q This pair of WHT & ORG are then soldered to the IEC AC module,
to the pin labeled ‘N’, which is the middle terminal. I know that you will
not be able to see this very will so observe the photo at the bottom of
this section.
q Once soldered on, slide the heatshrink tubing over this connection
and shrink it into place.
q Two down and one to go. The last remaining pair of BLK/WHT and
BRN/ORG wires do not connect to anything not even each other. The
t ruth of it is though, these wires will be live and must be treated with
c a re to prevent an electro c u t i o n .
q The BLK/WHT and BRN/ORG wires are trimmed to 9” (230mm),
m o re than cutting off any of the exposed wire lead ends.
q Slide a piece of 1” (25mm) long small heatshrink tubing (1/8”), onto
each wire end, but only half way. Shrink the tubing in place and fold
the loose end back against the wire. Take another piece of 1” (25mm)
long 3/16” tubing and slide it over BOTH of these wires to couple the
ends together.
q You have rolled the dice, please advance down to ‘STICKY Pad
P l a c e m e n t ’ .
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