Power reduction from 20W to 5W at the flick of a switch

This amplifier gives you the flexibility to adjust your power output based on your surroundings. Choose between 20W and 5W power output at the flick of a switch. Perfect for jumping from the rehearsal room to your home and back again.

Inspired by the original JTM45

The Studio JTM line of amplifiers replicates the renowned, velvety tones of the original Marshall JTM, and it looks every bit as wonderful as it sounds. Whether it’s played live or at home, let the JTM’s all-valve, era-defining sound steal the show.

Celestion G12M-65 Creamback

With the G12M-65 Creamback, you can achieve the timeless G12M tone while still accommodating higher power levels. This speaker is an excellent choice for modern players that desire a vintage sound. The enhanced power handling brings a rich low end, complementing the warm mid-range, crunchy upper-mids and refined highs.

Built in our UK factory

Skilfully crafted at our factory in Bletchley, England, the Studio JTM effortlessly captures the Marshall spirit. After years of development, this amp brings you the iconic warm and smooth tones of the original JTM. It’s also fashioned with classic Marshall touches, including a solid metal ‘coffin’ logo and gold piping and beading that harks back to the 1960s. The Studio JTM is sure to turn heads and ears.

For guitarists seeking the authentic British tone and vintage vibe that defined rock history, the Marshall ST20 C Studio JTM Guitar Amplifier Combo offers a compelling blend of classic sound and modern functionality. Whether you are a studio musician, gigging performer, or dedicated hobbyist, this amplifier delivers rich tonal character and versatile control, making it an essential tool to unlock your guitar’s full expressive potential.

The heart of this amplifier lies in its tube-driven design, featuring 2 x 12 AX7 preamp tubes and 2 x 5881 power tubes. This tube configuration replicates the warmth, natural compression, and harmonic richness that only a true valve amp can provide. With 20 watts of output power, scalable down to 5 watts, the ST20 C allows you to achieve that coveted Marshall overdrive at manageable volumes, ideal for both home practice and studio recording without sacrificing tonal integrity.

Equipped with a single 12-inch Celestion G12 M-65 Creamback speaker, this amp delivers a balanced sound profile with tight lows, smooth mids, and a singing top end. The G12 M-65 is revered for its ability to accentuate the classic British midrange crunch, which means your riffs and solos will cut through any mix with clarity and presence. The included 3-band EQ with presence control further empowers you to fine-tune your tone, adapting easily to different guitars, playing styles, and acoustic environments.

The amplifier’s two channels—High Treble and Normal—offer distinct voicings, allowing you to switch seamlessly between bright, cutting tones and warmer, fuller sounds. This flexibility means you can cover a wide spectrum of genres, from blues and classic rock to modern indie and hard rock. Additionally, the inclusion of an effects loop with an on/off switch provides convenient integration of your favorite modulation or delay pedals without compromising signal quality.

Practical connectivity options include two High Treble and two Normal 1/4″ inputs, catering to different guitar pickups and output levels, as well as five speaker outputs supporting 4, 8, and 16-ohm loads for added versatility with external cabinets. A DI output is also included, offering a direct feed for recording or live sound reinforcement, enabling you to capture your tone with accuracy and minimal setup complexity.

Measuring 18.1 inches in height, 19.7 inches in width, and 10.4 inches in depth, and weighing 39.2 pounds, the ST20 C Studio JTM remains portable enough for frequent transport while maintaining the solid build quality expected from Marshall. It runs on a standard IEC AC cable, ensuring compatibility with common power sources wherever you perform or record.

Whether you are refining your sound in the studio, performing intimate gigs, or simply want a reliable amplifier that delivers legendary Marshall tone without overwhelming volume, the ST20 C Studio JTM is designed to meet your needs. Its tube-driven warmth, versatile EQ, and practical features make it a dependable companion for any guitarist serious about their sound.

Investing in the Marshall ST20 C Studio JTM means choosing an amplifier that embodies decades of tonal heritage with modern-day practicality. Confidently take your playing to the next level knowing you have a powerful, flexible tool that will inspire creativity and deliver exceptional performance every time you plug in.