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Boss TU-3 Chromatic Pedal Tuner
It seems amazing that before the late 1990s, the concept of a dedicated pedalboard tuner hadn't truly taken hold. That all changed with the release of the legendary Boss TU-2, which went viral and redefined the modern pedalboard setup forever. Today, its direct successor, the Boss TU-3 Chromatic Tuner, remains the undisputed industry standard, gracing the boards of touring professionals and local gigging guitarists worldwide. Built with an upgraded 21-segment LED meter, selectable high-brightness modes for outdoor festivals, and a bulletproof enclosure, the TU-3 ensures your instrument stays perfectly in tune while doubling as a convenient power hub for your entire signal chain.
Angkor Music Technical Evaluation: Visual Tracking, Accuracy, and Extended-Range Rig Integration
The engineering evolution from the TU-2 to the TU-3 centers heavily on visibility resolution and extended digital tracking capabilities. The modern TU-3 integrates a high-density **21-segment LED meter** that delivers granular visual feedback with an exceptional tracking accuracy of **+/- 1 cent**. To combat the glare of open-air daytime stages, the built-in **High-Brightness mode** vastly increases the display's lumen output. For modern multi-string and down-tuned setups, the digital engine is highly versatile, providing flawless tracking in Chromatic or Guitar/Bass modes. It offers native tracking for 7-string electric guitars and 6-string electric basses, alongside a robust **Guitar Flat mode** that handles extreme drop tunings down to six semitones below standard pitch.
E-E-A-T Performance Standards: Automatic Muting & Power Distribution Integrity
At Angkor Music, the Boss TU-3 is our default recommendation for building reliable, road-ready pedalboard signal routing paths due to its dual functional utility. Silent Tuning Architecture: The moment you engage the footswitch, the tuner automatically mutes your entire output signal path, letting you tune silently on stage without broadcasting transient plucks to the audience. Power Distribution Circuit: Equipped with a DC loop-through port, running a standard daisy-chain cable from the TU-3 allows you to supply clean, regulated power to up to seven other Boss compact effects pedals, cleaning up messy power supplies across your board.
Technical Specifications
- Brand: Boss (Roland Corporation)
- Model Product Code: TU-3
- Form Factor Architecture: Compact Stompbox Pedal Tuner
- Display Meter Array: 21-Segment LED Meter with High-Brightness Control
- Tuning Accuracy Rating: Precision Level within +/- 1 Cent
- Tuning Modes Matrix: Chromatic, Guitar/Bass Mode (Tracks String Numbers)
- Extended Instrument Support: 7-String Guitars and 6-String Basses
- Flat Tuning Capabilities: Up to 6 Semitones below standard pitch (Guitar Flat Mode)
- Output Circuit Behavior: Automatic Signal Mute Mode during active tuning
- Visual Confirmation Tool: Accu-Pitch Sign Indicator System
- Power Loop Facility: DC Out port distributes power up to 7 Boss compact effect pedals
- Chassis Construction: Heavy-Duty Die-Cast Metal Housing
- Warranty Protection: Premium Boss Five-Year Factory Warranty
What's In The Box Product Contents
- Core Pedal Unit: 1 x Boss TU-3 Chromatic Stage Pedal Tuner
- Power Cell Element: 1 x 9V Dry Alkaline Battery (6F22/9V)
- Documentation Portfolio: 1 x Owner's Setup Manual & Factory Warranty Safety Sheets
Key Product Features
- High-Resolution 21-Segment Meter: Delivers incredibly fluid, ultra-precise visual feedback that makes dialing in the exact pitch center incredibly fast and intuitive.
- High-Brightness Daytime Mode: Selectable display setting engineered to punch through the wash of direct outdoor sunlight during summer festival sets.
- Professional +/- 1 Cent Accuracy: Provides surgical tuning tolerances, guaranteeing your chords sound perfectly intonated up and down the fretboard.
- Accu-Pitch Visual Confirmation: Flashes a distinct, dynamic light animation across the meter the exact millisecond you reach perfect target pitch, saving precious time between songs.
- Extreme Drop & Low-End Support: Seamlessly captures the ultra-low fundamental frequencies of deep B-strings on 6-string basses and modern extended-range 7-string electric guitars.
- Integrated Power Hub Link: Features a 9V DC output loop that routes power directly to neighboring stompboxes, minimizing cable clutter on your pedalboard deck.
- Bulletproof Road-Ready Build: Built into the legendary, battle-tested Boss metal enclosure designed to withstand decades of heavy stage stomping.
Frequently Asked Questions
How do I utilize the TU-3 to power my other guitar pedals?
To use the power distribution function, you must power the Boss TU-3 using an external 9V DC power adapter plugged into its DC In jack. From there, you connect a multi-plug DC daisy-chain cable (such as the Boss PCS-20A) into the pedal’s dedicated DC Out jack. This secondary port safely passes power down the line to deliver juice to up to seven standard Boss compact pedals, reducing the need for an expensive multi-outlet power brick for smaller setups.
What is the difference between Chromatic mode and Guitar/Bass mode on this pedal?
In Chromatic mode, the TU-3 acts as an open note detector, identifying whatever note you play instantly across the full chromatic scale. In Guitar/Bass mode, the internal digital tracking engine locks on to specific string numbers (e.g., String 1 through 7 for guitars, String 1 through 6 for basses). This string-specific tracking makes standard restringing adjustments faster and supports drop-tuning configurations up to 6 semitones down without losing track of which string you are servicing.
Does the Boss TU-3 feature a true bypass or a buffered bypass circuit?
The TU-3 utilizes Boss's legendary, high-integrity buffered bypass circuit. When the tuner is disengaged, the active internal buffer cleans up your high-frequency guitar signal, preventing the tone-sucking capacitive high-end roll-off that occurs when running long instrument cables or large pedal configurations. This ensures your core tone remains crisp, dynamic, and uncolored before it hits your amplifier stage.
Additional information
| Weight | 0.49 kg |
|---|---|
| type | Effects Pedal |








