Marshall design store Studio JTM ONE OF A KIND - 1 of 1 in Existence, Green/White Levant amp and cabinet

New in the Box!

20W Amplifier Head and 65-watt 1 x 12-inch Extension Cabinet

A Historic Collaboration

This is not just another Marshall amplifier—this is the result of an unprecedented collaboration between Marshall and Corcostra. One of a kind. The only one ever made. A singular piece of music history born from two legendary names coming together for one extraordinary creation.

Unparalleled Exclusivity

When you own this amplifier, you own something that no other musician, collector, or enthusiast can ever possess. This Marshall Studio JTM represents the fusion of Marshall's iconic amplification heritage with Corcostra's uncompromising vision for boutique excellence.

Two Legends, One Vision

Marshall has defined the sound of rock and roll for generations. Corcostra has built a reputation for curating and creating the world's finest musical instruments. Together, they've created something that exists nowhere else—a Studio JTM that embodies both brands' commitment to sonic perfection and craftsmanship.

The Only One in the World

This collaboration produced exactly one amplifier. Not a limited edition. Not a small batch. One. This Marshall x Corcostra Studio JTM will never be replicated, making it the ultimate statement piece for collectors who demand absolute rarity and documented provenance.

Museum-Grade Investment

This isn't just gear—it's a piece of music history. Whether you're a collector of rare instruments, a Marshall devotee, or someone who appreciates the intersection of art, engineering, and collaboration, this amplifier represents an investment opportunity that will never come again.

Specifications

• Exclusive Marshall x Corcostra collaboration
• Authentic Marshall Studio JTM design
• One-of-one production status—verified and documented
• Premium components throughout
• Collector-grade condition
• Includes certificate of authenticity
• Commemorative collaboration badgin

Tech Specs head amp

• Type:Tube
• Number of Channels:2
• Output Power:20W (5W)
• Preamp Tubes:2 x 12AX7 (preamp), 1 x 12AX7 (phase)
• Power Tubes:2 x 5881
• EQ:3-band EQ, Presence Control
• Inputs:2 x 1/4" (High Treble), 2 x 1/4" (Normal)
• Outputs:5 x 1/4" (4/8/16 ohms), 1 x 1/4" (DI out)
• Effects Loop:Yes (on/off switch)
• Power Source:Standard IEC AC cable
• Height:9.4"
• Width:19.7"
• Depth:9.1"
• Weight:20.4 lbs.
• Manufacturer Part Number:ST20H-U

Tech Specs cabinet

• Configuration:1 x 12"
• Powered:No
• Speakers:Celestion G12M-65 Creamback
• Power Handling:65W
• Impedance:16 ohms
• Mono/Stereo:Mono
• Cabinet Type:Straight
• Open/Closed Back:Semi-open
• Inputs:1 x 1/4"
• Height:19.3"
• Width:19.7"
• Depth:10.4"
• Weight:28.2 lbs.
• Manufacturer Part Number:ST112-U

Built in the UK and inspired by our first ever amp, the Studio JTM Head can create any tone from smooth to crunchy. If you’re looking for something unique, blend the two voices together and create your own sound.  

Swap between 20W and 5W with ease without having to compromise on tone.