Initial Wiring of the Vibrato Channel Inputs Jacks
Step 1
– Install the two vibrato channel jacks into the vibrato positions.
Step 2
– Install a 20AWG buss wire through all “sleeve” terminals as well as the top “tip”
terminal. Tack solder in place in all terminals. See drawing at right for reference.
Step 3
– On the upper jack (HI input), install a 1M resistor between the top “sleeve” terminal
(extending this lead to the grounding
washer) and the bottom “tip” terminal
(extend this component lead to the lower
jack). Solder all upper (HI input) jack
terminals, including grounding washer.
Step 4
– Thread the lead from the upper
jack 1M resistor through to the lower (LO
input) jack's top “tip” terminal.
Step 5
– Cut a 4” length of 18AWG black
wire and strip 1/4” and tin each end.
Step 6
– Solder one end of this wire
(along with the buss wire) to the lower
“sleeve” terminal of the bottom (LO input)
jack.
Initial Wiring of the
Normal Channel Controls
Step 1
– Salvage a length of white insulation
3/4” long, and install on one lead of a 100K
resistor.
Step 2
– Center the 100K resistor between the
two controls (with the insulated end along the
volume control terminals). Bend the leads at 90
degree angles at both ends so that each lead
goes into terminal 3 of the two appropriate
controls (photo 5.30a).
Step 3
– Solder one end of this component to
terminal 3 of the tone control.
Step 4
– Tack solder the remaining component lead to terminal 3 of the volume control.
Step 5
– Cut a length of 20AWG black wire 2 1/2” long. Strip and tin both ends.
Step 6
– Solder one end of this wire to terminal 2 of the tone control.
Step 7
– Cut a length of 20AWG black wire 4” long. Strip and tin both ends.
Step 8
– Insert the end of the 2 1/3” wire from terminal 2 of the nearby tone control along with
the above 4” wire into terminal 1 of this volume control. Solder both wires into place.
Step 9
– The remaining wires (as in the photo 5.30a) will come from the turret board later.
5.30
To further reduce noise and hum in the amp, solder the two 68K input resistors directly to
the jacks instead of mounting them to the turret board. Then add a shielded wire straight to
V3 pin 2, (in a similar fashion as the normal input jacks above). For more information, see
“Cool Modifications”, chapter 11.
MOD
Photo 5.29a
28 TubeDepot.com
Photo 5.30a
5.29
