BOSS - TU-3S | Chromatic Tuner

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)
Current Draw: 35 mA (DC 9 V)
95 mA (DC 9 V, when High Brightness mode is on)
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
OUTPUT jack
DC IN jack
DC OUT jack
Accessories: Owner's Manual
Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTE," and "Information")
Parallel DC code (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

Downloads

Support

If you have questions about operating your BOSS product, please check our Knowledge Base for answers to the most common questions.
You can also contact our Product Support department by phone or email.
In addition, we have a library of Owner’s Manuals and Support Documents that you can download and reference.