Bugera G20 INFINIUM 20 Watt Class-A Tube Amplifier Head User Manual

Introduction

This manual provides essential information for the safe and effective operation of your Bugera G20 INFINIUM 20 Watt Class-A Tube Amplifier Head. Please read through these instructions carefully before using the amplifier.

The Bugera G20 INFINIUM is a hand-built 20-Watt Class-A amplifier driven by 2 x ECC83 and 2 x EL34 tubes, featuring INFINIUM Tube Life Multiplier technology, MORPH EQ, and high-definition reverb.

Key Features

• Hand-built 20-Watt Class-A amplifier driven by 2 x ECC83 and 2 x EL34 tubes.
• Revolutionary INFINIUM Tube Life Multiplier technology for extended tube lifespan.
• Revolutionary MORPH EQ to seamlessly sweep between USA and British EQ-style tone.
• Classic push-pull power amp design for vintage tonal character.
• High-definition reverb with dedicated Reverb control.

What's in the Box

• Bugera G20 INFINIUM Tube Amplifier Head

Setup

Front Panel Overview

Image: Front panel of the Bugera G20 INFINIUM amplifier head, showing controls for Clean and Lead channels, Master section, and power switches.

1. Power Connection: Ensure the amplifier is connected to a suitable power source using the provided power cord.
2. Speaker Connection: Connect your speaker cabinet to the appropriate speaker output on the rear panel. Ensure the impedance switch matches your cabinet's impedance (4, 8, or 16 Ohms).
3. Instrument Input: Plug your guitar into the INPUT jack on the front panel.
4. Footswitch (Optional): Connect an optional Bugera FSB102A footswitch to the FOOTSW jack on the rear panel for remote channel switching and reverb control.

Rear Panel Overview

Image: Rear panel of the Bugera G20 INFINIUM amplifier head, displaying connections for power, INFINIUM tube life monitoring, emulated DI output, loudspeaker outputs, footswitch, and FX loop.

• INFINIUM Tube Life Monitoring: This section features LED indicators that light up when it's time to replace a power tube. It also includes a switch for Class A/B or Class A operation.
• Emulated DI Out: Provides a direct output with cabinet emulation (1x12 or 4x12 options) for recording or connecting to a PA system.
• Loudspeaker Outputs: Multiple jacks for connecting speaker cabinets, with an impedance selector switch.
• FX Loop: Send and Return jacks for connecting external effects pedals or processors.

Operating Instructions

Powering On

1. Ensure all connections are secure.
2. Flip the MAINS switch to the "ON" position. The indicator light will illuminate.
3. Wait approximately one minute for the tubes to warm up.
4. Flip the STANDBY switch to the "ON" position. The amplifier is now ready for use.

Front Panel Controls

• Clean Channel:
  • GAIN: Adjusts the input sensitivity and clean channel drive.
  • TREBLE, MID, BASS: Tone controls for the clean channel.
• Lead Channel:
  • GAIN: Adjusts the input sensitivity and lead channel drive.
  • TREBLE, MID, BASS: Tone controls for the lead channel.
  • VOLUME: Controls the output volume of the lead channel.
• Master Section:
  • MORPH EQ: Seamlessly sweeps between USA and British EQ-style tone characteristics.
  • PHAT: Engages a "Phat" boost for increased low-end response.
  • REVERB: Adjusts the intensity of the built-in high-definition reverb effect.
  • TONE CUT: Global tone control that cuts high frequencies.
  • VOLUME: Master output volume control for the entire amplifier.

Maintenance

Tube Replacement (INFINIUM Technology)

The Bugera G20 INFINIUM features advanced INFINIUM Tube Life Multiplier technology, which extends the lifespan of your power tubes and simplifies replacement.

• The INFINIUM TUBE LIFE MONITORING LEDs on the rear panel will illuminate when a specific power tube needs to be replaced.
• When an LED lights up, power down the amplifier, allow it to cool, and replace the indicated tube with a new, compatible EL34 tube.
• No biasing is required after replacement, thanks to the INFINIUM technology.

For optimal performance, it is recommended to use high-quality replacement tubes.

Troubleshooting

If you encounter any issues with your Bugera G20 INFINIUM, please refer to the following common troubleshooting steps:

• No Sound:
  • Check all cable connections (power, instrument, speaker).
  • Ensure the MAINS and STANDBY switches are in the "ON" position.
  • Verify that the speaker impedance switch on the rear panel matches your cabinet.
  • Check if any INFINIUM Tube Life Monitoring LEDs are lit, indicating a faulty tube.
• Weak or Distorted Sound:
  • Check for worn-out tubes (refer to INFINIUM LEDs).
  • Ensure instrument cables are not faulty.
  • Adjust GAIN and VOLUME controls appropriately.
• Excessive Noise/Hum:
  • Ensure proper grounding of the amplifier and other connected equipment.
  • Try different power outlets.
  • Check for faulty instrument or speaker cables.

For further assistance, please contact Bugera customer support.

Specifications

Warranty and Support

For warranty information and technical support, please refer to the official Bugera website or contact your authorized dealer. Keep your purchase receipt for warranty claims.

Returns: This product offers 30-day free returns, refund/replacement options. Please check with your retailer for specific return policies.