1. Introducción
Gracias por la compraasing the Blackstar St. James 50 EL34 Combo Ampmás duradero. Esta amplifier is designed to deliver exceptional tube tone in a lightweight and portable package. It features two footswitchable channels, EL34 power tubes, a 1x12 inch Celestion Zephyr speaker, and Blackstar's Cab Rig DSP technology for direct recording and XLR output. This manual provides essential information for safe and optimal use of your ampmás duradero.
2. Instrucciones de seguridad
- Leer instrucciones: Always read and understand all safety and operating instructions before using this product.
- Instrucciones de conservación: Conserve estas instrucciones para futuras consultas.
- Preste atención a las advertencias: Siga todas las advertencias en el producto y en las instrucciones de funcionamiento.
- Agua y humedad: Do not use this apparatus near water. Avoid exposure to rain or moisture.
- Ventilación: Asegúrese de que haya una ventilación adecuada. No bloquee ninguna abertura de ventilación.
- Calor: No lo coloque cerca de fuentes de calor como radiadores, rejillas de calefacción, estufas u otros aparatos (incluidos ampificadores) que producen calor.
- Protección del cable de alimentación: Proteja el cable de alimentación para que no sea pisado ni aplastado.
- Limpieza: Limpiar únicamente con un paño seco.
- Servicio: Encargue todas las tareas de mantenimiento a personal técnico cualificado. Se requiere realizar el mantenimiento cuando el aparato haya sufrido algún daño, como por ejemplo si el cable de alimentación o el enchufe están dañados, si se ha derramado líquido o han caído objetos en el interior del aparato, si el aparato ha estado expuesto a la lluvia o la humedad, si no funciona con normalidad o si se ha caído.
- Alto voltage: Tubo ampLos infladores funcionan a alto volumentages. Do not attempt to open the chassis or service the unit yourself.
3. Configuración
3.1 Desembalaje
Retire con cuidado el amplifier from its packaging. Inspect for any signs of damage during transit. Retain the packaging for future transport or storage.
3.2 Conexión de alimentación
- Asegúrese de que ampEl interruptor de encendido del generador está en la posición "APAGADO".
- Connect the supplied IEC mains power cable to the MAINS INPUT on the rear panel of the ampmás duradero.
- Plug the other end of the power cable into a suitable grounded mains outlet.
3.3 Conexión de guitarra
Connect your guitar to the INPUT jack on the front panel using a high-quality instrument cable.
3.4 Conexión del pedal
Connect the supplied footswitch to the FOOTSWITCH jack on the rear panel. This allows remote switching between channels and activating the Channel II Boost.
3.5 Cab Rig Output Connection
The Cab Rig output provides advanced DSP cabinet simulation for direct recording or connection to a PA system.
- Audio USB: Connect a USB cable from the USB port on the rear panel to your computer for direct recording and access to the Cab Rig software.
- XLR D.I.: Use an XLR cable to connect the XLR D.I. output to a mixing console or audio interface.
- Fuera de la linea: Use a 1/4" jack cable to connect the LINE OUT to other line-level devices.
3.6 Conexión del bucle de efectos
The effects loop allows integration of external effects pedals. Connect the SEND jack to the input of your effects unit and the RETURN jack from the output of your effects unit. Adjust the EFFECTS LOOP LEVEL switch for optimal signal matching.
4. Controles y Funciones
4.1 Controles del panel frontal

Esta imagen muestra la parte superior view of the Blackstar St. James 50 EL34 Combo Amplifier, highlighting the front panel controls. From left to right, you can see the Power and Standby switches, Master volume, Reverb knob, a three-band EQ (Treble, Middle, Bass), Volume II, Gain II, Channel II Boost switch, Volume I, Gain I, and the Input jack. The Power Reduction switch (50W/2W/SAG) is also visible.
- ENTRADA: Conecta tu guitarra aquí.
- CHANNEL I (Clean):
- GAIN I: Controls the input gain for Channel I.
- VOLUME I: Controls the overall output volume for Channel I.
- CHANNEL II (Overdrive):
- GAIN II: Controls the input gain for Channel II.
- VOLUME II: Controls the overall output volume for Channel II.
- CH. II BOOST: Activates a boost for Channel II, increasing gain and volume. Can be activated via footswitch.
- EQ (GRAVES, MEDIOS, AGUDOS): Three-band equalizer to shape the amptono del lificador.
- REVERBENCIA: Controla el nivel del efecto de reverberación digital incorporado.
- DOMINAR: Controla el volumen de salida general del ampmás duradero.
- POWER REDUCTION (50W/2W/SAG): Selecciona el amplifier's output power (50W, 2W) or activates the 'SAG' mode for a more vintage, compressed feel.
- APOYAR: Activa o desactiva el amplifier's standby mode. Always use when powering on/off.
- FUERZA: Interruptor de alimentación principal para el ampmás duradero.
4.2 Conexiones del panel posterior

This image shows the rear panel of the Blackstar St. James 50 EL34 Combo Amplifier. Visible connections include the MAINS INPUT, FUSE, SPEAKER OUTPUTS (1x16 Ohm, 1x8 Ohm, 2x16 Ohm), EFFECTS LOOP (SEND, RETURN, LEVEL switch), CAB RIG OUTPUTS (USB, XLR D.I., LINE OUT), and FOOTSWITCH input.
- ENTRADA DE RED: IEC power inlet for the mains cable.
- FUSIBLE: Mains fuse holder. Replace only with the specified type and rating.
- SALIDAS DE ALTAVOCES: Connect external speaker cabinets here. Ensure correct impedance matching (1x16 Ohm, 1x8 Ohm, 2x16 Ohm).
- EFFECTS LOOP (SEND, RETURN, LEVEL): For connecting external effects pedals. The LEVEL switch adjusts the loop's sensitivity.
- CAB RIG OUTPUTS (USB, XLR D.I., LINE OUT): Outputs with integrated cabinet simulation.
- INTERRUPTOR DE PIE: Connect the supplied footswitch for remote control of channels and boost.
5. Instrucciones de funcionamiento
5.1 Encendido y apagado
- Ensure all volume controls are set to minimum.
- Flip the POWER switch to 'ON'. The power indicator will illuminate.
- Wait approximately 30-60 seconds for the tubes to warm up, then flip the STANDBY switch to 'ON'.
- To power off, flip the STANDBY switch to 'OFF', then the POWER switch to 'OFF'.
Conmutación de 5.2 canales
Use the front panel channel switch or the footswitch to toggle between Channel I (Clean) and Channel II (Overdrive). The CH. II BOOST can be engaged for additional gain on Channel II.
5.3 Modelado del tono
Adjust the BASS, MIDDLE, and TREBLE controls to sculpt your desired tone. The REVERB knob adds a studio-quality digital reverb effect.
5.4 Reducción de potencia
The POWER REDUCTION switch allows you to select between 50W and 2W output, or engage the 'SAG' mode. The 2W setting is ideal for lower volume playing, while 'SAG' mode provides a more dynamic and compressed tube response.
5.5 Cab Rig Functionality
The Cab Rig DSP offers advanced cabinet simulation. Connect via USB to your computer and use the dedicated Blackstar software to customize cabinet, microphone, and room simulations. This allows for versatile direct recording and live sound options without needing a physical speaker cabinet.
6. Mantenimiento
6.1 Limpieza
Limpiar el amplifier's exterior with a dry, soft cloth. Do not use abrasive cleaners or solvents. Ensure no liquids enter the ampchasis elevador.
6.2 Reemplazo del tubo
The St. James 50 EL34 Combo uses vacuum tubes which have a finite lifespan. If you notice a decrease in performance, unusual noise, or loss of volume, tubes may need replacement. Tube replacement should only be performed by qualified service personnel due to high internal voltages. Refer to the specifications for tube types.
6.3 Almacenamiento
Almacenar el amplifier in a dry, temperature-controlled environment, away from direct sunlight and extreme temperatures. If storing for extended periods, cover the ampamplificador para protegerlo del polvo.
7. Solución de problemas
- Sin sonido:
- Check power connections and ensure the POWER and STANDBY switches are 'ON'.
- Verify guitar and speaker cables are securely connected.
- Ensure all volume controls (Gain, Volume, Master) are not at minimum.
- Check the fuse on the rear panel. Replace if blown with the correct type.
- Poor Tone/Weak Sound:
- Ajustar la configuración del ecualizador.
- Compruebe si hay cables defectuosos.
- Ensure correct speaker impedance matching if using an external cabinet.
- Tubes may be worn out. Consult a qualified technician for tube testing/replacement.
- Excessive Hum/Noise:
- Asegúrese de que la toma de corriente tenga una conexión a tierra adecuada.
- Pruebe con una toma de corriente diferente.
- Mueva el ampMantenga el dispositivo alejado de otros dispositivos electrónicos que puedan causar interferencias.
- Check for faulty tubes or internal components.
If problems persist, contact Blackstar customer support or a qualified service technician.
8. Especificaciones

This image shows the Blackstar St. James 50 EL34 Combo Amplifier from the front, highlighting its fawn Tolex covering and black grille cloth. The Blackstar logo is visible above the grille.
| Característica | Detalle |
|---|---|
| Número de modelo | STJ50EL34C |
| Salida Wattage | 50 vatios (conmutable a 2 vatios) |
| Tubos de poder | EL34 |
| Vocero | 1 x 12-inch Celestion Zephyr |
| Canales | 2 (Clean, Overdrive with Boost) |
| Reverberación | Studio-quality Digital Reverb |
| Bucle de efectos | Yes, with Level Control |
| Salida de cabina | USB Audio, XLR D.I., Line Out |
| Dimensiones del producto | 24.47 x 20.9 x 13.97 pulgadas |
| Peso del artículo | 1 pounds (Note: This weight seems incorrect for a tube combo amp and should be verified with manufacturer specifications) |
| Color | Adular |
9. Garantía y soporte
For warranty information and technical support, please refer to the official Blackstar Amplificacion website or contact your authorized Blackstar dealer. Keep your proof of purchase for warranty claims.






