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Adjusting and setting the main circuit board
The trimmer potentiometer on the main circuit board adjusts the Nutube
bias voltage. Normally, adjust this so that it produces maximum volume.
1. Connect a battery or AC adapter
When using batteries to power this unit, connect a cable to the input
jack.
Tip
Plugging the cable into the INPUT jack will power the unit.
2. Turn the TUBE GAIN knob up to maximum (all the way to the
right).
Set all other knobs to their center positions. Turn the EFFECT switch
on.
3. Adjust the trimmer potentiometer on the main circuit board.
Turn the fixed resistor and adjust so
that it reaches the maximum volume.
The brightness of the Nutube may look
different from left to right. This is not a
defect.
Tip:
The sound quality will change
depending on the bias voltage
settings. Adjust the settings according
to the sound that you like.
4. Set the WIDE switch.
Turn the WIDE switch ON for full-range
booster settings. When using the OD-S
along with guitar amp distortion, turn
the WIDE switch OFF for a more cutting sound. Choose the setting that
you like.
Trimmer
potentiometer
WIDE switch
Operation Check
When you have successfully finished assembling the unit, test its operation
while reading “Part Names and Functions” on page 10.
If you have found any problems with assembly or operation, use the
troubleshooting steps below.
Troubleshooting
There aren’t enough parts.
• If you have lost some parts, contact us at nutekt.org.
• Also, contact us at nutekt.org if any parts were missing or damaged
before you started to assemble the unit.
I can’t assemble the unit, because I broke a part.
• Please contact us at nutekt.org.
The unit makes an abnormal sound when I tilted it or shook it after
assembly.
• A loose screw or other part might be left inside the unit. Open the lower
case and check the inside.
The volume controls or jacks are loose.
• Make sure that the nuts are fastened tightly. Remove the knobs from the
volume controls and retighten the nuts.