D'Addario PW-CT-17CBK

D'Addario Eclipse Headstock Tuner (PW-CT-17CBK) Instruction Manual

Model: PW-CT-17CBK

1. Product Overview

The D'Addario Eclipse Headstock Tuner is designed for fast, accurate chromatic tuning of cello and bass instruments. It features a full-color vertical display, automatic power-off, and pitch calibration, all within a discreet, compact design. The multi-swivel action ensures optimal viewing angles for various instruments.

D'Addario Eclipse Headstock Tuner, main product view

Figure 1: D'Addario Eclipse Headstock Tuner, showcasing its compact design.

2. Key Features

  • Extreme Accuracy: Utilizes a precise piezo transducer to detect instrument vibrations, ensuring accurate tuning.
  • Wide Calibration Range: Adjustable pitch calibration from 430-450Hz for versatile performance.
  • Secure Clip-On Design: Features a non-marring, lever-lock clamp for secure attachment and easy removal without damaging the instrument.
  • Full-Color Vertical Display: A tri-color reversible backlit LCD screen provides clear visibility, even in low-light conditions.
  • Automatic Power-Off: The tuner automatically powers off after 10 minutes of inactivity to conserve battery life.
  • Multi-Swivel Action: Allows for flexible positioning and optimal viewing angles on various instruments, including cello and double bass.
Full Color Vertical Display of the D'Addario Eclipse Tuner

Figure 2: The tuner's full-color vertical display for easy note recognition.

D'Addario Eclipse Tuner demonstrating multi-swivel action on a guitar headstock

Figure 3: Multi-swivel action allows for flexible positioning on instrument headstocks.

3. Setup

3.1 Battery Installation

The D'Addario Eclipse Tuner comes with a CR2032 battery included. Before first use, ensure any protective plastic tabs preventing battery contact are removed. If replacing the battery, gently open the battery compartment and insert a new CR2032 battery with the positive (+) side facing up.

3.2 Attaching the Tuner

  1. Locate a suitable clamping point on your instrument. For cello and double bass, attach the tuner to the lower-strings side of the bridge for optimal accuracy. For other instruments, the headstock is a common and effective placement.
  2. Press the lever-lock clamp to open the jaws.
  3. Position the tuner securely on the instrument, ensuring good contact for vibration detection. The rubberized grips prevent marring the instrument's finish.
  4. Adjust the tuner's display using the multi-swivel action to achieve a comfortable viewing angle.

4. Operation

4.1 Powering On/Off

  • To power on the tuner, press and hold the central power button.
  • To power off the tuner, press and hold the central power button again.
  • The tuner will automatically power off after 10 minutes of inactivity to conserve battery life.
D'Addario Eclipse Tuner attached to a cello bridge, showing auto power-off feature

Figure 4: The tuner's auto power-off feature helps preserve battery life.

4.2 Tuning Your Instrument

  1. Once the tuner is powered on and securely attached, pluck a single string on your instrument.
  2. The tuner's display will show the detected note and indicate whether it is sharp (too high), flat (too low), or in tune.
  3. Adjust the tuning peg of the corresponding string until the note displayed on the tuner matches your desired pitch and the indicator shows it is in tune (typically a green or central indication).
  4. Repeat this process for all strings until your instrument is fully in tune.

4.3 Pitch Calibration

To adjust the tuner's calibration (A4 frequency), use the up and down arrow buttons located next to the power button. The calibration range is from 430Hz to 450Hz. The standard pitch for A4 is 440Hz.

5. Maintenance

5.1 Battery Replacement

When the display dims or the tuner becomes unresponsive, it may be time to replace the CR2032 battery. Carefully open the battery compartment, remove the old battery, and insert a new one, ensuring correct polarity.

5.2 Cleaning

Wipe the tuner with a soft, dry cloth to remove dust or smudges. Avoid using harsh chemicals or abrasive materials that could damage the display or casing.

6. Troubleshooting

  • Tuner not turning on: Ensure the CR2032 battery is correctly installed and has sufficient charge. Check for any protective plastic tabs that may still be in place preventing battery contact.
  • Inaccurate readings: Verify the tuner is securely attached to the instrument, making good contact for vibration detection. Ensure the instrument is played clearly and individually for each string. Check the calibration setting (A4 frequency) to ensure it matches your desired standard.
  • Display issues: If the display is dim or flickering, replace the battery. If the issue persists, contact D'Addario customer support.

7. Specifications

FeatureDetail
BrandD'Addario
Model NumberPW-CT-17CBK
Item Type NameCello/Bass Tuner
Tuning TypeChromatic, Vibration-based
DisplayFull-Color Vertical LCD
Calibration Range430-450Hz
Power SourceCR2032 Battery (included)
Auto Power-OffYes (after 10 minutes)
Item Dimensions (L x W x H)6.65 x 4.09 x 1.18 inches
Item Weight7 Grams
UPC019954310561

8. Warranty & Support

8.1 Warranty Information

The D'Addario Eclipse Headstock Tuner is replaced if found defective. For specific warranty claims and procedures, please refer to the official D'Addario warranty policy or contact customer support.

8.2 Customer Support

For further assistance, technical support, or product inquiries, please visit the official D'Addario website or contact their customer service department.

Official Website: daddario.com

© 2026 D'Addario & Company, Inc. All rights reserved.

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