Specifications

Wiring the Ground Buss
Step 1 – With a small knife, scratch a spot through the yellow
plated coloration on the back of each potentiometer approximately 1/4”
diameter in the center of each of the three mounted pots, exposing the
bare metal underneath (photo 6.15a).
Step 2 – Apply a small bead of solder to each of
these cleaned areas (photo 6.15b).
Step 3 – Start by soldering one end of the buss
wire to the ground / sleeve terminal of the bright
channel input 2 jack (photo 6.15c).
Step 4 – Route the buss wire across the back of
each of the pots, soldering this wire in place at each spot
where there is a solder bead (photo 6.15d).
Step 5 – Trim but save the excess buss wire.
Proceed to 6.16
Wiring the PCB Grounds
Step 1 – Strip and tin the end of the black wire coming from
pad “G7” and solder this wire to the grounding buss wire
connected between the two volume controls (photo 6.15d).
Step 2 – Strip and tin the end of the black wire coming from
pad “G10” and solder this wire to the #8 solder terminal
secured at the power transformer nearest the fuse holder
(photo 6.16a).
Proceed to 6.17
Wiring the Volume and Tone Controls
Step 1 – On the volume control nearest the input jacks
(normal volume), wire a small piece of buss wire between
the left terminal (as looking at the pot from the rear) to the
common buss wire across the back of the controls (photo 6.17a).
Step 2 – On the bright volume control, wire a small piece of buss wire between the left
terminal (as looking at the pot from the rear) to the common buss wire across the back of the
controls (photo 6.17a).
Step 3 – Strip and tin the end of the yellow wire coming from pad “c” and solder this wire to
6.16
TubeDepot.com 19
6.17
6.15
Solder will not adhere to the protective plating used on the rear of
the potentiometers. By removing a small area of the plating on
exposing the underlying bare metal, solder will adhere.
NOTE
Soldering to the back of pots is challenging because the heat
from the iron is quickly absorbed by the pot leaving the tip too
cold to properly apply solder. To overcome this, first apply a
large bead of solder to the soldering iron tip. Allow this bead to
warm for several seconds and then apply the tip with the solder
bead to the surface. The excess solder on the tip will provide
additional heat mass to the tip thereby improving heat transfer,
making the solder adhere.
NOTE
photo 6.15a
photo 6.15c
photo 6.15b
photo 6.15d
photo 6.16a