Marshall Studio JTM ST20H review – one of the most important amps in rock and blues gets a modern-day reboot

The classic JTM45 finally comes to the lower-watt Studio series – and it’s one of the finest Marshall amps in years

Marshall Studio JTM head
(Image: © Future / Phil Barker)

Guitar World Verdict

For a British-built Marshall, the Studio JTM ST20H is fairly priced and we reckon it’s good value for money compared to the competition, offering classic tones and cool vintage looks to match.


  • +

    Compact and portable.

  • +

    Nearly as loud as the JTM45 and doesn’t sacrifice any tone. Great for classic Brit blues/rock when cranked.

  • +

    Ideal pedal platform when clean.

  • +

    Useful series loop.


  • -

    Non-master volume design means you have to crank it up. Speaker has to stay connected when DI recording.

  • -

    No remote footswitching option.

You can trust Guitar World Our expert reviewers spend hours testing and comparing guitar products so you can choose the best for you. Find out more about how we test.

While there will always be a place for the traditional 100-watt head and 4x12 stack, those places have become more scarce in recent years. 

At the professional end of the market, advances in digital modelling, PA systems and in-ear monitoring have made it possible for guitarists to leave their treasured tube amps at home and take advantage of the reliability and convenience of digital solutions – although for many players the sound and feel of valves remains an essential part of their rig. 

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Nick Guppy

Nick Guppy was Guitarist magazine's amp guru for over 20 years. He built his first valve amplifier at the age of 12 and bought, sold and restored many more, with a particular interest in Vox, Selmer, Orange and tweed-era Fenders, alongside Riveras and Mark Series Boogies. When wielding a guitar instead of soldering iron, he enjoyed a diverse musical career playing all over the UK, including occasional stints with theatre groups, orchestras and big bands as well as power trios and tributes. He passed away suddenly in April 2024, leaving a legacy of amplifier wisdom behind him.