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Page 64
Before you prepare any more wires, note that 2 Black wires coming from the output
transformers will be connected to the Power Supply board at the 300B solder tabs — and that
4 Black wires will leave the Power Supply board from the 2 GND and 6SH7 solder tabs: 2
headed for the Driver board and 2 headed for the tag strips. All 6 of these wires will be routed
along the front of the chassis at the bottom and the 4 wires headed for the Driver board and
tag strips will then be routed between the output transformers. To keep things neat, we
recommend that you bundle these 6 wires together, using either a couple of cable ties or some
heatshrink. Don't worry about any left or right channel issues: the 2 300B solder tabs on the
Power Supply board are connected as are the 2 GND solder tabs, so the Left/Right orientation
of the wires is not an issue. Also, you can use you multimeter later, in Connectivity mode, to
identify which Black lead is the '6SH7' lead.
Route the bundle of 6 Black wires along the front of the chassis at the bottom.
Cut the 2 wires coming from the Primary of the output transformers to the lengths needed to
comfortably reach the 300B solder tabs on the Power Supply board, strip about 1/4" from the
ends of each, tin them, and connect them to the 300B solder tabs, from the underside. The
orientation doesn't matter.
Prepare the 4 Black wires leaving the Power Supply board by cutting them to a length of about
27", then stripping about 1/4" from each end of each wire, and tinning 3 of them (leave one not
tinned).
Make the following connections from the underside:
1 Black wire to the 6SH7 solder tab.
1 Black wire to one of the GND solder tabs, as shown above.
2 Black wires to the other GND solder tab, using the same technique you used earlier to solder
the Blue/White–Black LED wire: that is, insert the tinned wire from underneath — through
the solder hole and soldered on the bottom of the board — and wrap the other wire, not
tinned,
around the bottom
of the protruding tinned wire.
Again, trim off the excess wires on the top of the board
WITHOUT cutting into the wrapped wire
.
We'll connect the other ends later to the Driver board and tag strips.
Before you install the Power Supply board, we strongly recommend that you go
back to the beginning of this section and check every connection carefully!
Make sure there are no solder bridges on the underside of the board.
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