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Marshall ST20C Studio JTM 20W 1x12 Combo, Open Box

Original price £869.00
Original price £869.00 - Original price £869.00
Original price £869.00
Current price £859.00
£859.00 - £859.00
Current price £859.00

Please Note: This item is Open Box stock. It is in 'As New' condition with full warranty.

The amplifier that saw the birth of Marshall has returned. Experience the renowned JTM sound in a smaller form factor, delivering the cherished power Marshall is known for. The JTM makes a delightful addition to the Studio series, granting musicians an authentic, velvety, and tube-driven breakup at reduced levels, ideal for both home and studio applications.

Similar to its original 30W predecessor, the Studio JTM houses a duo of ECC83 preamp valves, two 5881 power amp valves, and one ECC83 phase splitter. Retaining the same level of control and versatility as earlier models, the Studio JTM unlocks a realm of all-valve tonal possibilities simply by connecting the two channels. With the added convenience of power switching, effortlessly toggle between 20W and 5W, while the presence of two loudness controls allows for playing at any desired volume. Furthermore, modern enhancements such as a DI out and FX loop have been incorporated, propelling the JTM into the present era.

A welcomed addition to the combo is it's Celestion G12M-65 Creamback speaker, which is an epitome to the classic British tone. With its 12-inch diameter and 65-watt power handling, this speaker delivers a balanced blend of warmth, clarity, and punch. The Creamback's distinctive character lies in its ability to produce rich, creamy midrange tones, smooth highs, and tight low-end response. It is a favorite choice among guitarists seeking to capture vintage-style rock, blues, and classic rock tones.

Given its remarkable legacy, it comes as no astonishment that the JTM boasted an impressive roster of esteemed owners, including trailblazers like Jimi Hendrix, Angus Young, Joe Bonamassa, and Gary Moore, among others. Countless individuals have been captivated by its mesmerizing tone, whether encountered live on stage or within the confines of a recording studio. Now, the opportunity awaits for you to contribute to this storied history and become a part of its enduring narrative.



  • Power: 20W with power reduction to 5W
  • Valves: 2x ECC83, 1x ECC83 (phase shifter) and 2x 5881
  • Channels Single channel with four separate inputs. High treble and normal loudness controls
  • Equalisation: Treble, middle, bass and presence
  • Speaker outputs: 5x 1/4" jack sockets (16Ω load / 8Ω load / 4Ω load)
  • Outputs: DI out
  • Speaker config: 1x12"
  • Speaker model: Celestion G12M-65 Creamback (16Ω 65W)