Boss TU-3 Chromatic Pedal Tuner



Boss TU-3 Chromatic Pedal Tuner


The world’s top-selling stage tuner, the BOSS TU-2, evolves and improves with the debut of the new TU-3. Housed in a tank-tough BOSS stompbox body, the TU-3 features a smooth 21-segment LED meter with a High-Brightness mode that cuts through the harshest outdoor glare. Choose between Chromatic or Guitar/Bass tuning modes, and enjoy visual pinpoint tuning verification with the Accu-Pitch Sign function. The TU-3 incorporates a convenient Note Name Indicator that can display notes of 7-string guitars and 6-string basses, while the Flat-Tuning mode can support up to six half-steps. It’s the new-standard tuner that no guitarist or bass player should be without!

  • 21-segment LED meter with brightness control
  • High-Brightness mode enhances meter visibility outdoors
  • Accurate to +/- one cent
  • Accu-Pitch Sign function provides visual verification when tuning is complete
  • Chromatic and Guitar/Bass mode (tune by string number, with support for 7-string guitars and 6-string basses)
  • Flat tuning is supported with Guitar Flat mode, which allows for “drop” tunings up to six semitones below standard pitch
  • Tuner automatically mutes when the tuner is on
  • Supplies power for up to seven BOSS compact effect pedals
  • BOSS five-year warranty

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Tuning Range: C0 (16.35 Hz)--C8 (4,186 Hz)
Reference Pitch: A4 = 436--445 Hz (1 Hz step)
Tuning Accuracy: +/- 1 cent

- Chromatic flat x2
- Guitar
- Guitar flat x2
- Bass
- Bass flat x3

Display mode
- Cent mode
- Stream mode

Power Supply: Carbon-zinc battery (9V, 6F22) or Alkaline battery (9V, 6LR61)
AC adaptor (sold separately)

Bypass: Buffered bypass

- Pedal switch
- MODE button
- STREAM/CENT button

Nominal Input Level: -20 dBu

Input Impedance: 1 M ohm
Nominal Output Level: -20 dBu
Output Impedance: 1 k ohm
Recommended Load Impedance: 10 k ohms or greater
Indicator: CHECK indicator (Serves also as battery check indicator)

- INPUT jack
- OUTPUT jack
- BYPASS jack
- DC IN jack
- DC OUT jack

Current Draw
- 20 mA (DC 9 V)
- 80 mA (DC 9 V, when High Brightness mode is on)

Expected battery life under continuous use: Carbon: Approx. 5 hours
Alkaline: Approx. 21 hours
*These figures will vary depending on the actual conditions of use.

- Owner's Manual
- Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTE," and "Information")
- Carbon-zinc battery (9V, 6F22)

Options (sold separately)
- AC adaptor: PSA series
- Parallel DC cord: PCS-20A(DC Plug x8)



- 73 mm
- 2-7/8 inches

- 129 mm
- 5-1/8 inches

- 59 mm
- 2-3/8 inches

Weight (including battery)
- 390 g
- 14 oz


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