Introduction
The Blackstar St. James 50-Watt 6L6 Tube Guitar Amplifier Head is a lightweight, two-channel all-tube amplifier designed for guitarists seeking versatile tones and portability. This amplifier head features a candlenut plywood construction, making it up to 47% lighter than traditional 50W amplifiers. It offers a wide range of tones from clean to vintage crunch, accessible via footswitchable channels and voicing selectors. Advanced features include cabinet simulation (Cab Rig), power reduction options, and multiple output connectivity including balanced XLR, line out/headphones, and USB for direct recording.
This manual provides essential information for the safe and effective use of your St. James amplifier head. Please read it thoroughly before operation.
Image: Front view of the Blackstar St. James 50-Watt 6L6 Tube Guitar Amplifier Head, showcasing its control panel and branding.
Safety Instructions
- Always connect the amplifier to a properly grounded power outlet.
- Ensure the correct speaker impedance is matched when connecting to a speaker cabinet. Refer to the 'Speaker Output' section for details.
- Do not expose the amplifier to rain or moisture.
- Do not remove the amplifier chassis cover. There are no user-serviceable parts inside, and dangerous high voltages are present. Refer all servicing to qualified personnel.
- Ensure adequate ventilation around the amplifier to prevent overheating.
- Disconnect the power cord before cleaning or moving the amplifier.
Setup
1. Unpacking and Placement
- Carefully remove the amplifier head from its packaging.
- Place the amplifier on a stable, level surface, ensuring proper ventilation. Avoid placing it near heat sources or in direct sunlight.
2. Connecting the Speaker Cabinet
The St. James 50-Watt 6L6 Head requires an external speaker cabinet. Connect a speaker cable (not an instrument cable) from one of the 'SPEAKER OUTPUTS' on the rear panel to your speaker cabinet. Ensure the impedance of your cabinet matches the selected output (8 Ohm or 16 Ohm).
Image: Rear panel of the Blackstar St. James 50-Watt 6L6 Tube Guitar Amplifier Head, showing various input/output jacks and power connection.
3. Connecting Your Guitar
Plug your guitar into the 'INPUT' jack on the front panel using a standard instrument cable.
4. Connecting the Footswitch (Optional)
Connect the supplied footswitch to the 'FOOTSWITCH' jack on the rear panel for remote control of channel switching and voicing.
5. Power Connection
Connect the supplied mains power cable to the 'MAINS INPUT' on the rear panel and then to a suitable grounded power outlet.
Operating Instructions
1. Powering On
- Ensure all connections are secure and volume controls are set to a low level.
- Flip the 'POWER' switch to the ON position. The power indicator light will illuminate.
- Wait approximately 30-60 seconds for the tubes to warm up, then flip the 'STBY' (Standby) switch to the ON position. The amplifier is now ready for use.
2. Channel Selection and Voicing
The St. James amplifier features two channels, each with two voicings:
- Channel I (Clean): Controls 'VOLUME I'. Use the 'CH. I VOICE' switch to select between two distinct clean voicings.
- Channel II (Overdrive): Controls 'GAIN II' and 'VOLUME II'. Use the 'CH. II VOICE' switch to select between two distinct overdrive voicings, ranging from classic crunch to modern high-gain.
- Switch between Channel I and Channel II using the 'CH. SELECT' button on the front panel or the footswitch.
3. Tone Controls
Adjust your tone using the following controls:
- BASS: Adjusts the low-frequency response.
- MIDDLE: Adjusts the mid-frequency response.
- TREBLE: Adjusts the high-frequency response.
- SHAPE: Provides further tonal shaping, often affecting the mid-range character.
4. Reverb
The 'REVERB' control adjusts the amount of built-in digital reverb effect, adding spatial depth to your sound.
5. Master Volume
The 'MASTER' control adjusts the overall output volume of the amplifier.
6. Power Reduction
The 'POWER' switch allows you to select different wattage settings for varying output levels and tonal characteristics:
- 50W: Full power output.
- SAG: Introduces power amp sag for a more vintage, compressed feel.
- 2W: Reduces output power for lower volume practice or recording while retaining tube tone.
7. Effects Loop
The 'EFFECTS LOOP' (SEND and RETURN jacks on the rear panel) allows you to connect external effects pedals between the preamp and power amp sections of the amplifier. Connect the 'SEND' to the input of your effect and the output of your effect to the 'RETURN'.
8. Cab Rig (Cabinet Simulation)
The 'CAB RIG OUTPUT' provides advanced cabinet simulation for direct recording or connection to a PA system. It offers three different simulated cabinet options. This output can be used via balanced XLR or line out/headphones. The 'USB AUDIO' port also provides a direct connection to a computer for recording with Cab Rig simulation.
Maintenance
1. Cleaning
Clean the amplifier's exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents. For stubborn dirt, a slightly damp cloth can be used, followed by a dry cloth. Ensure no liquids enter the amplifier.
2. Tube Replacement
The St. James amplifier uses 6L6 power tubes and ECC83 preamp tubes. Tubes have a finite lifespan and will eventually need replacement. If you notice a decrease in performance, loss of tone, or unusual noise, the tubes may need to be replaced. Tube replacement should be performed by a qualified technician due to high internal voltages.
3. Ventilation
The amplifier is equipped with a cooling fan to maintain optimal operating temperatures. Ensure that the rear ventilation grille is not obstructed. Regular checks for dust buildup on the fan and grille are recommended. Clean gently with a soft brush or vacuum if necessary.
4. Storage
When not in use for extended periods, store the amplifier in a dry, temperature-controlled environment, away from extreme temperatures and humidity.
Troubleshooting
If you encounter issues with your St. James amplifier, refer to the following common troubleshooting steps:
- No Sound:
- Check all cable connections (guitar, speaker, power).
- Ensure the 'POWER' and 'STBY' switches are both in the ON position.
- Verify that all volume controls (guitar, amplifier channels, master) are turned up.
- Test with a different guitar and cables to rule out external equipment issues.
- Check the speaker cabinet connection and impedance.
- Poor Tone or Weak Output:
- Adjust tone controls (Bass, Middle, Treble, Shape) to desired settings.
- Ensure the 'POWER' reduction switch is not set to a very low wattage if you desire full output.
- Tubes may be worn out. Consult a qualified technician for tube testing and replacement.
- Excessive Hum or Noise:
- Ensure the amplifier is connected to a grounded power outlet.
- Try a different power outlet or circuit.
- Check for faulty cables or interference from other electronic devices.
- Worn tubes can sometimes cause excessive noise.
- Footswitch Not Working:
- Ensure the footswitch cable is securely connected to the 'FOOTSWITCH' jack.
- Inspect the footswitch cable for damage.
If the problem persists after attempting these steps, please contact Blackstar customer support or a qualified service technician.
Specifications
| Brand | Blackstar |
| Model Number | BLA-STJ506L6H |
| Output Wattage | 50 Watts |
| Tube Type | 6L6 (Power), ECC83 (Preamp) |
| Channels | 2 Channels, 2 Voicings Per Channel |
| Power Reduction | Yes (to 2W, with SAG option) |
| Reverb | Yes |
| Speaker Emulated Output | Yes (Cab Rig, XLR, Line Out/Headphones) |
| USB Recording | Yes |
| Effects Loop | Yes |
| Item Weight | 21 pounds (9.5 kg) |
| Product Dimensions | 9.8"D x 16.16"W x 17.36"H (24.9cm D x 41.05cm W x 44.1cm H) |
| Power Source | Corded Electric |
| Compatible Devices | Guitar |
Image: Blackstar St. James 50-Watt 6L6 Tube Guitar Amplifier Head with indicated dimensions (17.36"W x 16.16"H x 9.8"D).
Warranty and Support
Warranty Information
Blackstar Amplification products are covered by a manufacturer's warranty against defects in materials and workmanship. The specific terms and duration of the warranty may vary by region and product. Please retain your proof of purchase for warranty claims.
Customer Support
For technical assistance, service, or warranty inquiries, please contact Blackstar Amplification customer support through their official website or your authorized dealer. Provide your product model number (BLA-STJ506L6H) and serial number when contacting support.
