Introducción
The MXR M233 Micro Amp+ is an advanced guitar and bass effects pedal designed to boost and enhance your instrument's tone. Building upon the classic Micro Amp circuit, this pedal features added EQ controls (Bass and Treble), low-noise operational amplifiers, and true bypass switching for superior signal integrity. It provides up to +26dB of clean boost, allowing you to drive your amplifier harder or increase your signal level for solos.
Información de seguridad
- Use only the specified 9V DC power supply (center-negative). Incorrect power supplies can damage the unit and void the warranty.
- Do not expose the pedal to extreme temperatures, humidity, or direct sunlight.
- Evite dejar caer el pedal o someterlo a impactos fuertes.
- Do not attempt to open the pedal enclosure or modify its internal components. Refer all servicing to qualified personnel.
- Mantener fuera del alcance de los niños.
Contenido del paquete
Your MXR M233 Micro Amp+ bundle includes:
- MXR M233 Micro Amp+ Pedal
- 9V DC Power Supply (not explicitly listed in product data, but implied by 'PSU' in model number and standard pedal operation)
- Two (2) Instrument Cables
- Two (2) Patch Cables
- Manual de usuario (este documento)
Producto terminadoview
The MXR M233 Micro Amp+ features intuitive controls for precise tone shaping and signal boosting.

Figura 1: Frente view of the MXR M233 Micro Amp+ pedal, showing the Gain, Bass, and Treble control knobs, the footswitch, and the Input/Output jacks.
Controles y conectores:
- Perilla de GANANCIA: Adjusts the amount of boost applied to your signal, from unity gain up to +26dB.
- Perilla de BAJO: Controls the low-frequency response of the boosted signal. Turn clockwise for more bass, counter-clockwise for less.
- Perilla de AGUDOS: Controls the high-frequency response of the boosted signal. Turn clockwise for more treble, counter-clockwise for less.
- Toma de entrada: Connect your instrument or the output of another effects pedal here.
- SALIDA Jack: Conecta esto a tu ampentrada del amplificador o la entrada del siguiente pedal en su cadena de señal.
- INTERRUPTOR DE PIE: Toggles the effect on and off. The LED illuminates when the effect is active.
- Entrada de 9 V CC: Connect a 9V DC (center-negative) power adapter here.

Figura 2: Trasero view of the MXR Micro Amp+ pedal, highlighting the 9V DC power input jack.
Configuración
Follow these steps to connect your MXR M233 Micro Amp+ pedal:
- Conexión de energía: Connect a 9V DC (center-negative) power adapter to the 9V DC input jack on the pedal. Ensure the power adapter is compatible to prevent damage.
- Conexión del instrumento: Use one of the provided instrument cables to connect your guitar or bass to the APORTE jack of the Micro Amp+.
- AmpConexión del elevador: Use another instrument cable to connect the PRODUCCIÓN jack of the Micro Amp+ to your ampentrada del lificador.
- Signal Chain Integration (Optional): If integrating into an existing pedalboard, use the provided patch cables to connect the Micro Amp+ between other effects pedals. The Micro Amp+ is typically placed early in the signal chain to boost the instrument's signal before other effects, or later to boost the overall signal for solos.

Figura 3: Example of an instrument cable included in the bundle.

Figura 4: Example of a patch cable included in the bundle.
Instrucciones de funcionamiento
Once connected, operate your MXR M233 Micro Amp+ as follows:
- Activate the Pedal: Press the footswitch to engage the effect. The LED will light up, indicating the pedal is active. Press again to bypass the effect (true bypass).
- Ajustar ganancia: Girar el GANAR knob clockwise to increase the boost level. Start with the knob at a lower setting and gradually increase to achieve the desired volume and drive.
- Shape Tone with EQ:
- BAJO: Ajustar el BASS knob to add or cut low frequencies. For a classic Micro Amp sound, set this knob to the 12 o'clock (noon) position.
- TRIPLICAR: Ajustar el TRIPLICAR knob to add or cut high frequencies. For a classic Micro Amp sound, set this knob to the 12 o'clock (noon) position.
- Experimento: The optimal settings will vary depending on your instrument, amplifier, and other pedals. Experiment with different knob positions to find the sound that best suits your needs.
Mantenimiento
To ensure the longevity and optimal performance of your MXR M233 Micro Amp+:
- Limpieza: Limpie el pedal con un paño suave y seco. No utilice limpiadores abrasivos ni disolventes.
- Almacenamiento: Guarde el pedal en un lugar fresco y seco, alejado de la luz solar directa y de temperaturas extremas cuando no esté en uso.
- Cuidado de cables: Handle instrument and patch cables carefully. Avoid sharp bends or kinks that can damage the internal wiring.
- Fuente de alimentación: Desconecte siempre la fuente de alimentación cuando el pedal no vaya a utilizarse durante períodos prolongados.
Solución de problemas
| Problema | Posible causa | Solución |
|---|---|---|
| No hay sonido cuando el pedal está activo. | Fuente de alimentación incorrecta, cables defectuosos, conexiones incorrectas, pedal puenteado. | Verify 9V DC (center-negative) power supply. Check all cable connections. Ensure footswitch LED is illuminated. Test cables with another device. |
| Ruido o zumbido excesivo. | Bucle de tierra, fuente de alimentación defectuosa, interferencia de otros dispositivos electrónicos. | Use a high-quality isolated power supply. Try a different power outlet. Move pedal away from other electronic devices. Check for faulty cables. |
| El LED no se enciende. | No power, faulty power supply, pedal not engaged. | Asegúrese de que la fuente de alimentación esté conectada y funcionando. Presione el pedal para activar el efecto. |
| Boost level is too low/high. | GAIN knob setting. | Adjust the GAIN knob to the desired level. |
Si continúa experimentando problemas, comuníquese con el servicio de atención al cliente.
Presupuesto
| Característica | Detalle |
|---|---|
| Modelo | M233 Micro Amp+ |
| Formato de señal | Cosa análoga |
| Efectos de salida de audio | Preamp / Boost |
| Ganancia máxima | +26dB |
| Fuente de poder | Corded Electric (9V DC, center-negative) |
| Volumentage | 9 voltios |
| Traspuesta | True bypass |
| Peso del artículo | 1.68 pounds (pedal and bundle accessories) |
| Dimensiones del paquete | 11.3 x 9.96 x 2.99 pulgadas |
| Color | Blanco |
Garantía y soporte
This product is covered by a manufacturer's warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or visit the official MXR website. For technical support, troubleshooting assistance, or warranty claims, please contact the retailer where the product was purchased or the manufacturer's customer service department.
For additional resources and product information, you may visit the official MXR websitio: www.jimdunlop.com/mxr/