BOSS TU-3 Chromatic Tuner

Tuning Features:

• Tuning Range: From C0 (16.35 Hz) to C8 (4186 Hz), covering the entire range of most instruments.
• Reference Pitch (A4): Adjustable from 436 Hz to 445 Hz in 1 Hz steps, allowing you to fine-tune the reference pitch to suit your tuning needs.
• Tuning Accuracy: +/- 1 cent, providing highly precise tuning that ensures accurate intonation.

Modes:

• Chromatic Mode: A mode that allows tuning to all notes, offering maximum flexibility for all instruments.
• Chromatic Flat x2 Mode: A chromatic tuning mode with an additional flat tuning range.
• Guitar Mode: Preconfigured for standard guitar tuning.
• Guitar Flat x2 Mode: A mode allowing for flat tunings on guitar (e.g., drop tunings).
• Bass Mode: Configured for bass guitars, including low-end tuning.
• Bass Flat x3 Mode: A bass-specific mode with additional flat tunings.

Display Modes:

• Cent Mode: Displays the pitch in cents for precise tuning adjustments.
• Stream Mode: Likely shows a dynamic, stream-like visualization of the tuning process, helping the user easily see whether they’re sharp or flat.

Input/Output:

• Nominal Input Level: -20 dBu, suitable for most line-level signals.
• Input Impedance: 1 M ohm, ideal for high-impedance instruments like electric guitars or basses.
• Nominal Output Level: -20 dBu.
• Output Impedance: 1 k ohm.
• Recommended Load Impedance: 10 k ohms or greater, ensuring compatibility with most amplifiers or audio equipment.

Bypass:

• Buffered Bypass: Ensures that the signal remains strong and unaffected when the tuner is bypassed, preventing signal degradation.

Controls:

• Pedal Switch: Used to toggle the tuner on or off.
• MODE Button: Switch between different tuning modes (chromatic, guitar, bass, etc.).
• STREAM/CENT Button: Switch between display modes (Stream mode or Cent mode).

Power Supply:

• Battery:
  • Carbon-zinc 9V battery (6F22) or
  • Alkaline 9V battery (6LR61).
• AC Adaptor: PSA series (sold separately).
• Current Draw:
  • 20 mA under normal use.
  • 80 mA when High Brightness mode is on (likely for better visibility in bright environments).
• Expected Battery Life:
  • Carbon-zinc: Approx. 5 hours.
  • Alkaline: Approx. 21 hours.

Connectors:

• INPUT Jack: 1/4-inch phone type for connecting your instrument.
• OUTPUT Jack: 1/4-inch phone type for sending the signal to an amplifier or next device.
• BYPASS Jack: Likely for external control of bypass (for example, using a footswitch).
• DC IN Jack: For connecting an external AC power adapter (PSA series).
• DC OUT Jack: Likely allows for chaining multiple pedals or devices together.

Accessories:

• Included: Leaflet with safety and usage information, 9V Carbon-zinc battery (6F22).
• Optional: AC Adapter (PSA series), Parallel DC cord (PCS-20A, DC Plug x8).

Size and Weight:

• Width: 73 mm (2-7/8 inches).
• Depth: 129 mm (5-1/8 inches).
• Height: 59 mm (2-3/8 inches).
• Weight (including battery): 390 g (14 oz).