Marshall ST20H Studio JTM 20W Valve Amp Head
Classic '60s Marshall tone from a compact, convenient package! Made in the UK, featuring 20W/5W power switching, FX loop & DI output.
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Want to Click and Collect or try items at our Guildford Store?
The store is open 10am - 6pm Monday to Saturday and 11am - 5pm Sunday and bank holidays.
The stock information shows the quantity of units that are available to purchase at the Guildford store and the quantity of units that are available at our off-site Guildford warehouse. These stock levels are updated in real time.
Our Click and Collect service is available at our Guildford store from 10am - 6pm Monday to Saturday, and 11am - 5pm on Sunday. You can either choose click and collect as your delivery option online or, during store opening hours, call our sales team at 01483 456777 to place a 10% deposit.
If you have placed your order online, you will receive a confirmation email of your order and a separate follow-up text or email to confirm when your item is ready for collection.
Please do not come to the store before you have received the follow-up message, as your order may not yet be ready at the store.
If the only available stock is in our off-site warehouse it can be brought to the store location for you to try - you just need to contact the store within opening hours. Please note any requests received after 3.30pm will not arrive at the store until the following morning.
Please be aware that, unless you have paid a deposit to reserve the item, it will continue to be free, both online and in-store, for another customer to buy. Therefore we would advise you to place a 10% deposit by either using the on-line click and collect service or calling us 01483 456777.
SKU: ST20H
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Product Description
The amp that started it all is back! Delivering the same iconic JTM sound, the ST20H Studio JTM head gives you all of that marvellous Marshall mojo but in a new compact size with some modern enhancements up its sleeve. Offering authentic, smooth, and valve-driven break-up at lower volumes — the Marshall ST20H is perfect for home or studio use, yet its superb all-valve design packs a serious punch for live use too!
Classic Marshall Crunch, Contemporary Refinements
Like the original 30W head, the Marshall Studio JTM is loaded with two ECC83 preamp valves, two 5881 power amp valves and one ECC83 phase splitter — taking you right back to the renaissance of rock 'n' roll. The Studio JTM also offers the same control and versatility as older models, where simply patching the two channels together opens up a world of tonal possibility.
Handy power switching has been added to allow you to change effortlessly between 20W and 5W modes, with two loudness controls meaning that you can play as loud as you like! Marshall have really gone the extra mile for modern musicians by integrating features such as a DI output and FX loop too, bringing the JTM into the now!
Made in the UK
Handbuilt at Marshall's world-class factory in Bletchley, England, the ST20H Studio JTM features finger-jointed cabinets, hand-welded chassis, hand-soldered potentiometers and valve bases, and the highest quality componentry. Adorned with period-correct aesthetics from the same metal, red enamel poured "coffin" logo, to its fawn fret complete with gold piping and beading — the Studio JTM beautifully nods to the swinging '60s.
"When I was demonstrated the Studio JTM, it took me back to my original JTM45, it was my sound… I feel like it is going to be something special." — Terry Marshall (son of Jim Marshall, the founder of Marshall and creator of the original JTM45).
Key Features
- Reproduces the legendary, warm tone of the original Marshall JTM that inspired generations of musicians — pioneered by the likes of Jimi Hendrix, Angus Young and Gary Moore.
- Compact design that packs a punch, taking up less space than the original without sacrificing tone.
- Easily swap between 20W and 5W power modes, for era-defining sound optimised for the stage, studio or the home.
- Jump channels with a patch cable just like the original JTMs, to achieve a unique blend of heavier or treble-boosted sounds.
- Updated with an FX loop, to allow for seamless use with your favourite reverb, delay or modulation pedals.
- A new DI output feature lets you easily use the Studio JTM direct with a recording device or PA system — no mic'ing required!
- Expertly crafted in Bletchley, England, with iconic touches that hark back to the 1960s.
Specifications
- Power: 20W with Power Reduction to 5W
- Valves: 2 x ECC83 (Preamp), 1 x ECC83 (Phase Splitter) and 2 x 5881 (Power Amp)
- Channels: Single Channel with Four Separate Inputs (High Treble and Normal Loudness Controls)
- Equalisation: Treble, Middle, Bass and Presence
- Speaker Outputs: 5 x 1/4" Jack Sockets (16Ω Load / 8Ω Load / 4Ω Load)
- Outputs: DI
- Weight: 9.25 kg
- Width: 500 mm
- Height: 240 mm
- Depth: 230 mm
- Matching Extension Cabinets: ST112, ST212