BOSS TU-3 Chromatic Tuner Pedal – Used

Quick Product Summary

The BOSS TU-3 Chromatic Tuner is one of the most widely used pedal tuners around, combining accurate tuning, excellent stage visibility and BOSS's famously rugged compact-pedal construction.

This used example is in Good condition, showing visible signs of previous ownership and regular pedalboard use. With silent tuning, Guitar, Bass and Chromatic modes, High Brightness operation and the ability to distribute power to additional pedals, the TU-3 is an extremely practical pedalboard utility.

What Makes the BOSS TU-3 Special?

The TU-3 uses a clear 21-segment LED meter with both conventional Cent and moving Stream display modes. Tuning accuracy is rated at ±1 cent, while High Brightness mode improves visibility under strong stage lighting or outdoors.

Engaging the tuner automatically mutes the main Output, allowing completely silent tuning between songs. A separate Bypass output is also provided, while the DC OUT connection can distribute power to compatible pedals when the TU-3 is powered from a suitable external adaptor and optional parallel power cable.

Who Is It For?

The TU-3 is ideal for guitarists and bassists who need a reliable, easy-to-read tuner for rehearsal, recording and live performance.

Its rugged construction, extended-range instrument support and pedalboard power-distribution capability also make it an excellent choice for working musicians who want a dependable tuner at the front of their signal chain.

At A Glance

Feature	Details
Product Type	Chromatic Pedal Tuner
Condition	Used – Good
Tuning Accuracy	±1 Cent
Tuning Range	C0–C8
Display	21-Segment LED
Display Modes	Cent / Stream
Instrument Modes	Chromatic, Guitar, Bass
High Brightness Mode	Yes
Silent Tuning	Yes
Bypass	Buffered
DC Power Output	Yes
Power	9V Battery or 9V DC

Condition Overview

Condition Grade: Good

This tuner is in good used condition, with visible cosmetic signs of previous ownership and normal pedalboard use.

It remains a dependable working example suitable for rehearsal, studio and live performance.

What’s Included?

• BOSS TU-3 Chromatic Tuner Pedal

• No power supply included

Technical Specifications

Specification	Details
Model	TU-3
Product Type	Chromatic Pedal Tuner
Tuning Range	C0 (16.35Hz)–C8 (4,186Hz)
Reference Pitch	A4 = 436–445Hz
Tuning Accuracy	±1 Cent
Tuning Modes	Chromatic, Guitar, Bass
Flat Tuning	Supported
Display Modes	Cent, Stream
Meter	21-Segment LED
High Brightness Mode	Yes
Accu-Pitch Sign	Yes
Input	1 x 1/4" Jack
Main Output	1 x 1/4" Jack
Bypass Output	1 x 1/4" Jack
Input Impedance	1 MΩ
Output Impedance	1 kΩ
Bypass	Buffered Bypass
DC Input	Yes
DC Output	Yes
Power	9V DC or 9V Battery
Current Draw	Approx. 20mA
High Brightness Current Draw	Approx. 80mA
Dimensions	Approx. 73 x 129 x 59mm
Weight	Approx. 0.86 lbs including Battery

Power Requirements

The BOSS TU-3 can be powered using a standard 9V battery or a suitable BOSS PSA-series 9V DC power supply.

When powered from a suitable external adaptor, the DC OUT connection can also provide power to compatible pedals using an optional BOSS PCS-20A parallel DC cable.

No power supply or parallel power cable is included with this used pedal.

FAQs

How accurate is the BOSS TU-3?

The TU-3 provides tuning accuracy of ±1 cent, making it suitable for stage, rehearsal and everyday studio use.

Can it tune both guitar and bass?

Yes. Dedicated Guitar and Bass modes are provided alongside standard Chromatic tuning.

Does it support extended-range instruments?

Yes. Guitar mode supports seven-string guitars, while Bass mode supports five- and six-string basses.

Can it handle lowered tunings?

Yes. Flat-tuning options are available for players using lowered guitar or bass tunings.

What is Stream mode?

Stream mode uses moving LEDs to show whether the note is sharp or flat. The movement slows as you approach the correct pitch and stops when tuning is accurate.

What is Cent mode?

Cent mode provides a more conventional meter-style tuning display, showing how far the note is from the target pitch.

Does the TU-3 mute the guitar while tuning?

Yes. Engaging the tuner mutes the main Output, allowing silent tuning on stage.

What is the Bypass output for?

The separate Bypass jack allows the signal to remain present regardless of whether the tuner itself is engaged.

Does it have a bright display for outdoor gigs?

Yes. High Brightness mode increases LED visibility under strong lighting and outdoor conditions.

Does it use true bypass?

No. The TU-3 uses BOSS buffered bypass, helping maintain signal strength through longer cable runs and larger pedalboards.

Can the TU-3 power other pedals?

Yes. When powered from a suitable external adaptor, the DC OUT connection can distribute power to compatible pedals using the appropriate optional parallel cable.

Can it run from a battery?

Yes. It accepts a standard 9V battery.

Is a power supply included?

No. No power supply is included with this used TU-3.

What condition is this example in?

This example is graded Good, with visible signs of previous use consistent with a pre-owned pedal tuner.

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