Page 12 of 22
© 2006 ANACON Technology
FX LOOP
The Tubewonder is fitted with an active cross fade parallel/serial effects
loop. The loop can also be used for purposes other than connecting
outboard effects units to the amplifier. See lower right corner of the preamp
block diagram on page 7.
Pressing the “LOOP” switch on the foot pedal activates FX loop. The loop is
in bypass mode if foot pedal is disconnected from the amplifier.
In active mode the K4 relay connects Loop Return Buffer output to the Loop
Mixer (“C” and “NO” connected). FX Send Level potentiometer adjusts the
input signal to the effects processor in the loop. It should be set to the
maximum level that the processor will accept. Processed signal from the
effects loop then goes through the Loop Return Buffer to the Loop Mixer.
Loop Return Buffer has a gain switch so that its gain can be set to
accommodate either line level return signal (gain set to 0db) or instrument
level return signal (gain set to 20db). This allows you to use most of the
stomp boxes in the loop. You only need to adjust the Send Level properly.
Cross fade (Mix potentiometer in the Loop Return Mixer adjusts the
proportions between dry and processed signals. In fully counterclockwise
position only the dry signal is passed to the Master Volume and fully
clockwise only the processed signal is passed. This position is identical to
having a serial loop. Intermediate positions give different mix of dry and
processed signals.
The FX Loop can also be used as a Lead/Solo Level boost when no external
processors are connected to the loop:
•
Switch the loop off
•
Set “FX Send Level” to 0
•
Set “Mix” to ca 3 o’clock
•
Set Loop Return Buffer gain to 20db
•
Adjust Master Volume to comfortable playing level.
•
Activate loop
•
Adjust Send Level to required Lead volume level.
•
Fine-tune the level shift by adjusting the Mix knob.