1. Introduction and Product Overview
The Monoprice Stage Right 5-Watt 1x8 Guitar Combo Tube Amplifier with Celestion Speaker delivers authentic tube tone in a compact design. This amplifier is equipped with a 5-watt tube power section and a Celestion Super 8 GBA-15 speaker, providing a rich and dynamic sound suitable for practice and recording.
Key features include:
- 5-watt tube power amplifier with a Celestion brand speaker.
- Utilizes an ECC83/12AX7 preamplification tube and a 6V6GT power tube for the amplifier section.
- Features a Celestion Super 8 GBA-15 speaker.
- Frequency response range of 80Hz to 10kHz.
- Low hum and noise level of -75dB below rated power.
- Total harmonic distortion of 0.5%.
- Includes both Low and High inputs; the Low input attenuates the signal by approximately 50%, while the High input is designed for easier overdrive.
- Rear-ported cabinet design with a durable leather handle, cloth speaker grill, and a cream-colored, textured, synthetic leather exterior with chrome corner guards.
2. Safety Information
Please read and understand all safety instructions before operating this amplifier. Retain this manual for future reference.
- Electrical Shock Hazard: Do not open the amplifier chassis. Refer all servicing to qualified personnel.
- Moisture Exposure: Do not expose this equipment to rain or moisture.
- Grounding: This equipment must be earthed.
- Ventilation: Ensure proper ventilation. Do not block ventilation openings.
- Power Source: Connect only to the specified power supply voltage.
- Heat: Keep away from heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Cleaning: Clean only with a dry cloth.
3. Package Contents
Verify that your package contains the following items:
- 1x Monoprice 5-Watt Guitar Combo Tube Amplifier
- 1x Power Cord
- 1x Instruction Manual
4. Controls and Features
Familiarize yourself with the amplifier's controls and connections.
Figure 1: Front Panel Overview
Front Panel
- ON/OFF Switch: Toggles the amplifier power.
- Power Indicator Light: Illuminates when the amplifier is powered on.
- Volume Knob: Adjusts the overall output volume of the amplifier.
- Tone Knob: Controls the amplifier's tonal characteristics, from darker to brighter.
- 5W/1W Switch: Selects between 5-watt (full power) and 1-watt (reduced power) operation. This allows for achieving tube saturation at lower volumes.
- Input Jack: Connect your guitar or other instrument here.
Figure 2: Rear Panel Overview
Rear Panel
- External Speaker Output: Connects to an external speaker cabinet with an impedance of 8-16 ohms.
- Power Input: Connects the amplifier to an AC power source using the provided power cord.
Figure 3: Control Panel Detail
Figure 4: Input and Power Switch Detail
Figure 5: Amplifier Angled View
Figure 6: Amplifier with Guitar for Scale
5. Setup
Follow these steps to set up your amplifier:
- Placement: Place the amplifier on a stable, level surface, ensuring adequate ventilation around the unit. Avoid placing it near heat sources or in direct sunlight.
- Power Connection: Ensure the amplifier's ON/OFF switch is in the OFF position. Connect the provided power cord to the amplifier's power input on the rear panel, then plug the other end into a grounded AC power outlet.
- Instrument Connection: Connect your guitar or other instrument to the Input jack on the front panel using a standard 1/4-inch instrument cable.
- External Speaker (Optional): If using an external speaker cabinet, ensure the amplifier is OFF. Disconnect the internal speaker (if applicable and accessible) and connect an appropriate speaker cable from the External Speaker Output on the rear panel to your external cabinet. Ensure the external cabinet's impedance matches the amplifier's requirements (8-16 ohms).
6. Operation
Operating your Monoprice Stage Right amplifier is straightforward:
- Power On: With your instrument connected and volume knobs set to a low level, flip the ON/OFF switch to the ON position. The power indicator light will illuminate. Allow a few moments for the tubes to warm up.
- Adjust Volume: Slowly increase the Volume knob to your desired listening level.
- Adjust Tone: Use the Tone knob to shape your sound. Turning it clockwise generally increases treble, while counter-clockwise reduces it.
- 5W/1W Power Selection: Use the 5W/1W switch to select the desired output power. The 1-watt setting allows for achieving tube saturation and overdrive at lower volumes, ideal for practice or recording where high volume is not required. The 5-watt setting provides full power for louder output and more headroom.
- Input Selection: The amplifier features a single input. If your guitar has high output pickups or you desire a cleaner sound, you may find the Low input more suitable (if available on your specific model, otherwise the single input functions as a standard input). The High input is designed to be easier to overdrive for a more aggressive tone.
- Power Off: Before powering off, turn the Volume knob down. Then, flip the ON/OFF switch to the OFF position.
Video 1: This video provides an overview of what to consider when purchasing a tube amplifier, offering insights into their characteristics and usage. It can help users understand the nuances of their Monoprice tube amp.
7. Maintenance
Proper maintenance ensures the longevity and performance of your amplifier:
- Cleaning: Dust the amplifier regularly with a soft, dry cloth. Do not use liquid cleaners or solvents.
- Tube Care: Tube amplifiers contain vacuum tubes that have a finite lifespan. If you notice a decrease in performance, unusual noise, or a change in tone, the tubes may need replacement. Refer to qualified service personnel for tube replacement.
- Storage: When not in use for extended periods, store the amplifier in a cool, dry place, away from extreme temperatures and humidity.
- Transportation: When transporting the amplifier, ensure it is powered off and allowed to cool down. Handle with care to avoid damage to the tubes and internal components.
8. Troubleshooting
If you encounter issues with your amplifier, consult the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output | Amplifier not powered on; Volume knob too low; Instrument cable faulty; Guitar volume off; Speaker connection issue. | Ensure power is ON and indicator light is lit. Increase Volume. Check instrument cable and guitar volume. Verify internal or external speaker connection. |
| Weak or distorted sound | Faulty tubes; Incorrect input used; Speaker damage; External effects pedal issue. | Allow tubes to warm up. Try switching between 5W/1W modes. Test with a different instrument cable or guitar. If problem persists, consult qualified service personnel for tube or speaker inspection. Bypass any external effects pedals to isolate the issue. |
| Hum or unwanted noise | Ground loop; Nearby electronic interference; Faulty instrument cable; Worn tubes. | Ensure all equipment is properly grounded. Move amplifier away from other electronic devices. Try a different instrument cable. If hum is excessive, tubes may need inspection by a technician. |
9. Specifications
| Feature | Specification |
|---|---|
| Brand | Monoprice |
| Model Name | 1x8 |
| Model Number | 611705 |
| Amplifier Type | Tube |
| Output Wattage | 5 Watts |
| Speaker Size | 8 Inches |
| Speaker Model | Celestion Super 8 GBA-15 |
| Preamplification Tube | ECC83/12AX7 |
| Power Tube | 6V6GT |
| Frequency Response | 80Hz - 10kHz |
| Hum and Noise | -75dB below rated power |
| Total Harmonic Distortion | 0.5% |
| Inputs | Low, High (single input jack, sensitivity varies) |
| External Speaker Impedance | 8-16 Ohms |
| Power Source | Corded Electric |
| Enclosure Material | Wood |
| Item Dimensions (D x W x H) | 8.3"D x 12.2"W x 12"H |
| Item Weight | 18.2 Pounds |
| UPC | 757901820304 |
10. Warranty and Support
This Monoprice amplifier comes with a 1-year warranty from the date of purchase, covering defects in materials and workmanship.
For technical support, warranty claims, or service inquiries, please contact Monoprice Customer Service through their official website or the contact information provided with your purchase documentation. Please have your model number (611705) and proof of purchase ready when contacting support.