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FX LOOP INSTALLATION
Installing this module will require you to work with high voltage. Previous experience with tubes and/or tube
amplifiers is mandatory. It’s recommended to have the module installed by an amp technician.
COMPLETE THE Fx BOARD
The Fx board has an option to determine the spacing of the SEND and RETURN jacks. They can be spaced 1 inch
or 1-1/2 inch apart. It may depend on whether you plan to install the optional BYPASS SWITCH or not.
You need to decide on the spacing and then locate and solder in place, the supplied, loose jack and trim pot.
The locations are printed on the Fx PCB.
INSTALLING THE OPTIONAL BYPASS SWITCH
When the cables are unplugged, and the PCB is powered, the Fx loop is bypassed, but some amps have bypass
switching options so you can easily
compare the Effect in and out of
circuit. So a DPDT switch is provided.
Desolder and remove 2 PCB jumpers
in the area of the IN / OUT PCB pads.
Prepare 6 - 26 ga wires about 6” long
to reach BYPASS switch chassis
mounting hole on chassis.
Connect each wire to the matching
switch lug.
Twist the wires together by rotating
the DPDT toggle switch to form a
bundle
Test with the amp off, that in BYPASS
mode, there is continuity between the
MV centre lug and PI input on eyelet
board.
Make sure to orient the switch so that
the BYPASS chassis labels match the
correct toggle position (down) and
install the switch.
INSTALLING THE FX LOOP
The installation requires you to connect an Input, OUTPUT, GROUND, HIGH VOLTAGE (B+) and HEATER
VOLTAGE. Use shielded wire for IN and OUT connections. The Fx board should be inserted between the preamp
and phase inverter. Typically, just before a PI input.
