World-Standard Performance in a Tiny Footprint

The BOSS TU-3 is the world’s go-to stompbox tuner, trusted by players everywhere for its reliable operation and bulletproof durability. Scaled down in size, the TU-3S gives you the same industry-standard performance in a tiny footprint that saves precious pedalboard space. The display and tuning functions are identical to the TU-3—the only thing eliminated is the pedal switch. Always on and ready to go, the TU-3S is perfect for use with pedal switching systems like the BOSS ES-8 and ES-5, and ideal for any setup where space is at a premium

• Respected TU-3 tuning performance in a more compact size
• 21-segment LED meter with brightness control
• High Brightness mode enhances meter visibility outdoors
• Accu-Pitch Sign function provides visual verification when tuning is complete
• Chromatic and Guitar/Bass modes, with support for 7-string guitars and 6-string basses
• Guitar Flat mode supports “drop” tunings up to six semitones below standard pitch
• Powered by optional PSA-series adapter; DC Out jack for powering up to seven BOSS compact effect pedals via an optional PCS-20A daisy-chain cable
• BOSS five-year warranty

Specifications

Tuning Range

C0 (16.35 Hz)--C8 (4,186 Hz)

Reference Pitch

A4 = 436--445 Hz (1 Hz step)

Tuning Accuracy

+/- 1 cent

Modes

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

Display mode

Cent mode
Stream mode

Power Supply

AC adaptor (sold separately)

Bypass

Buffered bypass

Controls

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 (Power on indicator)

Connectors

INPUT jack: 1/4-inch phone type
OUTPUT jack: 1/4-inch phone type
DC IN jack
DC OUT jack

Current Draw

30 mA (DC 9 V)
85 mA (DC 9 V, when High Brightness mode is on)

Accessories

Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTE," and "Information")
Parallel DC cord (DC Plug x2)
Rubber foot

Options (sold separately)

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

Size and Weight

Width

73 mm
2-7/8 inches

Depth

84 mm
3-5/16 inches

Height

56 mm
2-1/4 inches

Weight (including battery)

220 g
8 oz

* 0 dBu = 0.775 Vrms

*The specifications are subject to change without notice.