1. Introduction
The Behringer V-TONE GM108 is a 15-watt true analog modeling guitar amplifier designed to provide a wide range of tonal options for guitarists. This manual provides essential information for the safe and effective operation, setup, and maintenance of your GM108 amplifier.
Figure 1.1: Front view of the Behringer V-TONE GM108 amplifier, showcasing its compact design and control panel.
2. Important Safety Instructions
- Read these instructions.
- Keep these instructions.
- Heed all warnings.
- Follow all instructions.
- Do not use this apparatus near water.
- Clean only with a dry cloth.
- Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
- Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
- Only use attachments/accessories specified by the manufacturer.
- Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
- Unplug this apparatus during lightning storms or when unused for long periods of time.
- Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
3. Setup and Connections
Before operating your Behringer V-TONE GM108 amplifier, ensure it is placed on a stable surface and connected correctly.
3.1 Power Connection
Connect the amplifier to a suitable AC power outlet using the provided power cord. Ensure the power switch is in the OFF position before connecting to power.
3.2 Instrument Connection
Plug your guitar into the INST INPUT jack on the front panel using a standard 1/4-inch instrument cable.
3.3 External Audio Device Connection
To play along with external audio sources such as a CD player or MP3 player, connect the audio device's output to the CD INPUT jack using a 1/4-inch cable.
Figure 3.1: Rear view of the Behringer V-TONE GM108, highlighting the power input and product information.
4. Controls and Functions
The front panel of the V-TONE GM108 features various controls to shape your sound. Familiarize yourself with these controls for optimal performance.
Figure 4.1: Detailed view of the GM108's front panel controls.
- INST INPUT: This is the 1/4-inch input jack for connecting your electric guitar.
- DRIVE: Controls the amount of gain and distortion. Turn clockwise for more overdrive and saturation.
- ANALOG MODELING - AMP Switch: Selects one of three classic amplifier voicings:
- TWEED: Emulates the soulful, bluesy sound of vintage 1950s amplifiers.
- BRITISH: Recreates the hard-rocking sound characteristic of 1960s British amplifiers.
- CALIF: Provides the sparkling clean tones associated with famous American West Coast amplifiers.
- ANALOG MODELING - SPEAKER Switch: Selects one of three speaker cabinet emulations:
- UK: Simulates the sound of a 4x12-inch speaker cabinet with an enclosed back.
- US: Simulates the sound of a 2x12-inch speaker cabinet with an open back.
- FLAT: A special setting optimized for the GM108's 8-inch speaker, providing a neutral response.
- CD INPUT: A 1/4-inch input for connecting external audio devices like CD players or MP3 players, allowing you to play along with your favorite music.
- LOW: Adjusts the bass frequencies of your sound.
- MID: Adjusts the mid-range frequencies of your sound.
- HIGH: Adjusts the treble frequencies of your sound.
- HEAD PHONE: A 1/4-inch stereo output for connecting headphones. This output includes speaker simulation for a realistic listening experience.
- MASTER: Controls the overall output volume of the amplifier.
- POWER: The main power switch for turning the amplifier ON or OFF.
5. Operating the Amplifier
5.1 Powering On and Initial Sound
After connecting your guitar and power, ensure the MASTER volume is set to a low level. Flip the POWER switch to ON. Gradually increase the MASTER volume to your desired listening level.
5.2 Shaping Your Tone with Analog Modeling
The V-TONE GM108 offers a versatile tone palette through its ANALOG MODELING section. Experiment with combinations of the AMP and SPEAKER switches to discover various sounds:
- For vintage blues tones, select TWEED amp modeling.
- For classic rock sounds, choose BRITISH amp modeling.
- For clean, articulate tones, select CALIF amp modeling.
- Combine these amp models with UK or US speaker emulations for different cabinet characteristics, or FLAT for a neutral response.
Adjust the DRIVE control to add anything from subtle grit to heavy distortion. Use the LOW, MID, and HIGH EQ controls to fine-tune the frequency response to your preference.
5.3 Practicing with External Audio
Connect your external audio device to the CD INPUT. The volume of the external audio source is controlled by the device itself. You can then play your guitar along with the music, with both sounds mixed through the amplifier's speaker or headphones.
5.4 Headphone Use
For silent practice, plug a pair of stereo headphones into the HEAD PHONE jack. The amplifier's speaker will be muted, and the headphone output will provide a simulated speaker sound. Adjust the MASTER volume for headphone listening.
6. Maintenance
The Behringer V-TONE GM108 is constructed with durable materials for longevity. Proper care will help maintain its performance and appearance.
- Cleaning: Clean the exterior of the amplifier with a soft, dry cloth. Do not use abrasive cleaners, solvents, or waxes, as these can damage the finish.
- Storage: When not in use for extended periods, store the amplifier in a dry, cool environment, away from direct sunlight and extreme temperatures.
- Ventilation: Ensure that the ventilation openings are not obstructed to prevent overheating.
- Transportation: While robust, handle the amplifier with care during transportation to prevent physical damage.
7. Troubleshooting
If you encounter issues with your V-TONE GM108, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from amplifier. |
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| Distorted or poor sound quality. |
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| Humming or buzzing noise. |
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If the problem persists after trying these steps, please contact qualified service personnel.
8. Specifications
| Feature | Detail |
|---|---|
| Model: | GM108 |
| Type: | True Analog Modeling Guitar Amplifier |
| Output Wattage: | 15 Watts |
| Speaker: | 8-inch Bugera Speaker |
| Controls: | Drive, Analog Modeling (Amp/Speaker), Low, Mid, High, Master Volume |
| Inputs: | 1/4" Instrument Input, 1/4" CD Input |
| Outputs: | 1/4" Headphone Output with Speaker Simulation |
| Power Source: | Corded Electric |
| Dimensions (H x W x D): | Approximately 13.98 x 15.43 x 7.64 inches (35.5 x 39.2 x 19.4 cm) |
| Weight: | Approximately 13.5 pounds (6.1 kg) |
9. Warranty and Support
This Behringer V-TONE GM108 amplifier comes with a standard manufacturer's warranty. Please refer to the warranty card included with your product for specific terms and conditions, or visit the official Behringer website for the most up-to-date warranty information and support resources.
For technical support, service, or replacement parts, please contact Behringer customer service or an authorized service center.
