Take full control of your Marshall Studio Series amp’s effects loop without having to reach around the back mid-song! At British Audio, we love that Marshall added a high-quality effects loop to their Studio Vintage (SV20) and Studio Classic (SC20) amplifiers, but we saw an opportunity to make these amps more functional for live use.

With our DIY Effects Loop Switching Kit, you can make the loop footswitchable, allowing you to turn it on and off using a standard Marshall single-button footswitch with an LED indicator.

Key Features:

• Designed for Marshall Studio Series – Fits SV20H, SV20C, SC20H, and SC20C amplifiers.
• Adds Footswitchable Control – Activate or deactivate your effects loop using a standard Marshall 1-button footswitch (included).
• Repurposes the DI Jack for the Footswitch – The DI output jack is replaced with a footswitch jack, making this mod ideal for live use, where loop switching is more beneficial than a DI output.
• Direct PCB Swap – Remove your amp’s rear PCB and install this upgraded version.
• Includes All Required Components – Everything you need to build and install the mod.
• Footswitch Included – The kit comes with a genuine Marshall-style footswitch for immediate usability.

What's Included in the Kit?

✔ Upgraded Rear PCB – Replaces the stock board to enable footswitching.
✔ All Required Components – Resistors, capacitors, and connectors for the full build.
✔ Marshall-Style Footswitch – LED-equipped single-button footswitch to engage/disengage the loop.
✔ Detailed Instructions – Easy-to-follow guide for assembly and installation.

Installation Requirements:

⚠ This is a DIY kit – Soldering skills and knowledge of working with high-voltage tube amplifiers are required.
⚠ DI Output Will No Longer Function – The DI jack will be repurposed as the footswitch jack. This mod optimizes the amp for live performance, prioritizing real-time loop switching over the DI function.
⚠ If you are unsure about the installation, we strongly recommend professional installation to avoid damage to your amplifier.

Why Choose British Audio?

At British Audio, we are more than just a repair shop—we’re innovators. Our team of amp experts and techs design solutions that improve real-world usability. With decades of experience in amplifier service and modification, we guarantee our kits are made to the highest standards.

Upgrade your Marshall Studio Series amp for live use with footswitchable effects loop control—order your DIY Effects Loop Switching Kit today!