Gustard H26 Fully Headphone Amplifier User Manual

1. Introduction

The Gustard H26 is a high-performance, fully balanced discrete Class A headphone amplifier designed to deliver exceptional audio fidelity. It incorporates advanced features and robust construction to provide a superior listening experience for audiophiles.

Key Features:

• Fully balanced discrete Class A amplifier with 8 pairs of power tubes for powerful and controlled sound.
• Seamless switching of preamplifier output, allowing the device to function as a pure pre-stage output.
• Pre-stage utilizes two direct-insert LME49720 dual op-amps.
• Matrix relay volume control for consistent and unbiased 4-way volume accuracy.
• Equipped with two custom 50W audio-specific toroidal transformers, one for each channel, ensuring minimal interference.
• Fully balanced input stage, enhancing clarity and richness for both balanced and single-ended RCA inputs.

2. Safety Information

Please read and follow these safety guidelines to ensure safe operation and to prevent damage to the device or injury to yourself.

• Do not expose the unit to rain, moisture, or extreme temperatures.
• Ensure proper ventilation around the amplifier to prevent overheating.
• Do not open the casing; refer all servicing to qualified personnel.
• Use only the specified power adapter and cables.
• Disconnect power before cleaning or moving the unit.

3. Package Contents

Verify that all items are present in the package:

• Gustard H26 Headphone Amplifier
• Power Cord
• Remote Control
• User Manual (this document)

4. Product Overview

4.1 Front Panel

The front panel provides access to essential controls and headphone outputs.

1. Touch Switch/Standby: Power on/off or place the unit in standby mode.
2. 4.4 Balanced Output: Headphone output for 4.4mm balanced connectors.
3. 6.35 Single-End Output: Headphone output for 6.35mm single-ended connectors.
4. XLR Balanced Output: Headphone output for 4-Pin XLR balanced connectors.
5. Remote Control Reception: Infrared receiver for the remote control.
6. Display Screen: Shows current settings such as volume, input, and gain.
7. Volume/Setup Knob: Adjusts volume and navigates setup menus.

4.2 Rear Panel

The rear panel houses all input and output connections, along with power controls.

• Balanced Input XLR 1 & 2 (Left/Right): For balanced audio sources.
• Single Input RCA (Left/Right): For single-ended audio sources.
• Preamp Output XLR (Left/Right): Balanced preamplifier output.
• Preamp Output RCA (Left/Right): Single-ended preamplifier output.
• Voltage Selection: Switch to select appropriate input voltage (e.g., 115V/230V).
• AC Power Input: Connect the power cord here.
• Power Switch: Main power toggle for the unit.
• Fuse: Replaceable fuse for electrical protection.

4.3 Internal Components

The Gustard H26 features a fully balanced discrete Class A amplifier design, utilizing 8 pairs of power transistors to ensure robust driving capability and precise control. The use of discrete components allows for fine-tuning of each stage, optimizing performance. The pre-stage incorporates two LME49720 dual op-amps.

The power supply section is equipped with two custom 50W audio-specific toroidal transformers, one dedicated to each channel. This design minimizes cross-channel interference and ensures stable power delivery. Multiple low-noise regulators and Nichicon capacitors contribute to the unit's clean power and overall audio quality.

4.4 Dimensions

The physical dimensions of the Gustard H26 are approximately 330mm (width) x 260mm (depth) x 65mm (height).

5. Setup

5.1 Connecting Power

1. Ensure the main power switch on the rear panel is in the OFF position.
2. Verify the voltage selection switch on the rear panel matches your local power supply (e.g., 115V or 230V).
3. Connect the provided power cord to the AC Power Input on the rear panel and then to a suitable wall outlet.

5.2 Connecting Audio Sources

The H26 supports both balanced (XLR) and single-ended (RCA) audio inputs.

• For Balanced Sources: Connect your audio source's balanced outputs to the XLR 1 or XLR 2 inputs on the rear panel.
• For Single-Ended Sources: Connect your audio source's RCA outputs to the RCA inputs on the rear panel.

5.3 Connecting Headphones

The H26 offers multiple headphone output options on the front panel.

• 4.4mm Balanced: For headphones with a 4.4mm balanced connector.
• 6.35mm Single-Ended: For headphones with a standard 6.35mm (1/4 inch) single-ended connector.
• 4-Pin XLR Balanced: For headphones with a 4-pin XLR balanced connector.

5.4 Preamplifier Output

The H26 can also function as a preamplifier. Connect the XLR or RCA Preamp Outputs on the rear panel to your power amplifier or active speakers. The headphone amplifier section can be turned off separately when using the preamplifier output.

6. Operation

6.1 Power On/Off

1. Flip the main power switch on the rear panel to the ON position.
2. Press the front panel Touch Switch (1) to power on the unit from standby, or to put it back into standby.

6.2 Volume Control

Rotate the Volume/Setup Knob (7) on the front panel clockwise to increase volume and counter-clockwise to decrease volume. The matrix relay volume control ensures precise and balanced adjustments across all channels.

6.3 Input Selection

Single press the Volume/Setup Knob (7) to cycle through available input sources (XLR 1, XLR 2, RCA). The selected input will be shown on the Display Screen (6).

6.4 Gain Level Adjustment

Long press the Volume/Setup Knob (7) to switch between low and high gain levels. This allows for optimal matching with various headphones and In-Ear Monitors (IEMs).

6.5 Quiescent Current Adjustment

Double press the Volume/Setup Knob (7) to toggle between 50mA and 100mA quiescent current settings. This feature allows for fine-tuning the Class A operation.

6.6 Using the Remote Control

The included remote control provides convenient access to all primary functions from a distance.

6.7 Operational Demonstration Video

This video demonstrates the operational controls, including volume adjustment, input selection, gain level, and quiescent current settings. While the video features a similar product (Aune S17 Pro), the control principles and functions are analogous to the Gustard H26.

7. Maintenance

7.1 Cleaning

To clean the unit, disconnect it from the power source. Use a soft, dry cloth to wipe the exterior surfaces. Avoid using abrasive cleaners, solvents, or chemical sprays, as these can damage the finish.

7.2 Storage

When not in use for extended periods, store the amplifier in a cool, dry place, away from direct sunlight and excessive dust. It is recommended to keep the original packaging for protection during storage or transport.

8. Troubleshooting

If you encounter issues with your Gustard H26, refer to the following common problems and solutions:

• No Power: Ensure the power cord is securely connected to both the unit and the wall outlet. Check the rear panel power switch and the front panel touch switch. Verify the voltage selection switch is set correctly.
• No Sound: Confirm that the correct input source is selected. Check all audio cable connections (source to amplifier, amplifier to headphones/speakers). Ensure headphone cables are fully inserted. Adjust the volume level.
• Distorted Sound: Check audio cable integrity. Ensure the input source is not overdriving the amplifier. Try adjusting the gain level to match your headphones.
• Remote Control Not Working: Check the batteries in the remote control. Ensure there are no obstructions between the remote and the unit's remote reception window.

If the problem persists after attempting these solutions, please contact customer support.

9. Specifications

Model Number:

H26

Brand:

Gustard

Connector Type:

RCA, XLR

Output Wattage:

50 Watts

Power Source:

Corded Electric

Color:

Black

Number of Bands:

4

10. Warranty and Support

10.1 Warranty Information

All Gustard products purchased from authorized retailers are covered by a warranty. The standard warranty period is 1 year or more from the date of purchase, depending on the specific product and regional regulations. Please retain your proof of purchase for warranty claims.

10.2 Customer Support

For technical assistance, troubleshooting, or warranty inquiries, please contact your retailer or the manufacturer's customer service. Support is typically available online, and inquiries are addressed promptly.