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Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp
Marshall Studio JTM ST20C 1x12 Guitar Amp

Marshall Studio JTM ST20C 1x12 Guitar Amp


Product Code: ST20C-H
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Delivery & Lead Times
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Marshall Studio JTM ST20C 1x12 Guitar Amp

The amp that started it all is back. The same iconic JTM sound, but more compact packing the power you know and love from Marshall, in a new compact size.

The Marshall JTM is a welcome addition to the Studio range, offering players authentic, smooth, and valve-driven break-up at lower volumes – perfect for home or studio use. Don’t let its size fool you, the superb all valve tone of the Studio JTM packs a punch. Creating a sound that defined a generation the JTM delivers the legendary loud blend of crunch and clean recognised the world over.

  • 20W with power reduction to 5W
  • 5881 Valve Output Stage
  • Celestion G12M-65 Creamback
  • DI Output
  • Weighs 17.8Kg

Like the original 30W head, the 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 offers the same control and versatility as older models, where simply patching the two channels together opens up a world of all-valve tonal possibility. Power switching enables you to switch effortlessly between 20W and 5W and two loudness controls mean you can play as loud as you like. Features such as a DI out and FX loop have been added, bringing the JTM into the now.

Hand built at our world-class factory in Bletchley, England, the Studio JTM features fingerjointed 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 60s.

Inspired by the first JTM that captured the sound of the 60s, the Studio JTM recreates the vintage tones that so many know and love. An unmistakable sound that is recognised all over the world, the Studio JTM is a loving homage to the amp that responded to the rock’n’roll revolution. From its legendary warm and smooth tone to blending the voices for a combination of crunch and clean, the Studio JTM brings the outstanding sound that Marshall is so well known for.

The smaller scale of the Studio JTM gives players the power of the authentic Marshall tone, in a more compact design. Handmade in the UK just like the original from the 60’s, the Studio JTM is significantly smaller and lighter than its 30W counterpart, making travelling and gigging a breeze.

The Studio JTM has built-in power reduction technology, enabling players to switch between 20W and 5W. Any guitarist in any environment can achieve the defining sound of the JTM, whether that’s at home or on stage. The iconic Marshall sound you know and love in a much smaller unit built in the UK just like the original 30W counterpart. Whether you’re at home, the studio, or the big stage – the Studio JTM can adapt to bring exceptional tone to any situation.

Handmade in the Marshall UK factory, the Studio JTM is built with the same expert craftsmanship, in the same factory, that has been manufacturing amps since the late 60’s. Faithfully assembled, the 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 distinctively solid metal, red enamel poured “coffin” logo to its fawn fret complete with gold piping and beading, the Studio JTM beautifully nods to the 60s.

Featuring the finest componentry, the Studio JTM is adorned with aesthetics from the 60s, with its fawn fret with gold piping to the iconic solid metal logo with a red enamel font. Jim bought these logos from a funeral hardware store, earning them their affectionate name of ‘coffin’ logos. Less than 50 made their way onto customer facing models, so reintroducing this classic Marshall logo onto the Studio JTM is a nod to where it all began.

Over 60 years ago, the JTM started it all, creating an iconic sound that changed the game forever. With such a rich heritage it’s no surprise that the JTM had a wealth of famous owners, pioneers such as Jimi Hendrix, Angus Young, Joe Bonamassa and Gary Moore to name a few. Untold millions have heard its tone on stage or in the studio, but now it’s your turn to be a part of history.

Ideal for creating that definitive vintage tone, the Studio JTM is equipped with G12M-65 Creamback Celestion speakers. Creamback speakers handle greater power allowing for additional low-end grunt that complements the warm and vocal mid-range crunchy upper.

Much like the original 30W JTM’s before it, the Studio JTM comes with the ability to blend voices with a patch cable. This gives players a unique blend of heavier tones and bright treble. To access both voices simultaneously a short jumper cable can be run between the two voice inputs.

A new era for JTM. The new Studio JTM comes with updated capabilities for players to take advantage of, such as an FX loop. This allows external effects, such as reverb and delay, to be placed in the ideal position in the signal chain after any added distortion. The Studio JTM also has a new DI output feature, providing players the ease of directly to a recording device or PA system.

Delivery & Lead Times

Delivery ETA's 

For accurate delivery information, please contact our sales team on or call 01323 639335. As a guide, despatch times are detailed below.

Additional charges will be made for delivery of heavy items to some areas. Charges may also apply to upgrades including (but not limited to) timed deliveries, piano assembly, delivery of large items, and when matching deals from other retailers. If you are unsure about our delivery charges, please contact us.

In Stock Products

Products that are shown as in stock will be sent using our standard delivery service within 2 working days from when payment is received. This excludes piano deliveries with full installation - see below.

Pre-Order Products

Products which are shown as pre-order are not in stock, but can be ordered and reserved for you from the next available shipment. Order today to reserve your place in the queue! Call or email us for the latest lead times on pre-order products.

Digital Piano Deliveries:

We have many flexible delivery options for most delivery pianos, based on your location and whether you require it flat-packed, or fully assembled in your home. Digital piano delivery options are shown at checkout. 

Piano Deliveries

If you purchase a piano which is supplied with full installation, we will contact you once your order is received to arrange a convenient delivery date & time. Delivery & installation is usually within 14 days, but often sooner. Call us for current lead times on pianos.

Digital Piano Deliveries For Self-Assembly

Click here to see our specific information relating to piano deliveries.

If you choose our courier delivery/flat pack delivery method, please be aware that with larger items such as digital pianos, the courier is not contracted to carry them up any steps or stairs. If there are stairs leading to the front door of the delivery address, or you live in an apartment which is not on pavement level, it is your responsibility to arrange transportation from the pavement level to the delivery address. In this instance, the delivery driver may, at their own discretion assist you in carrying the parcels to the delivery address, but they are not contracted nor obliged to do so.

Do you need delivery upstairs, or delivery at a specific time?

For some larger items which need to be delivered upstairs - including pianos, we offer a timed delivery service using our own van and drivers. This service is free on some items and chargeable on others. Call us on 01323 639335 to discuss your specific delivery requirements.

No-one at home?

Our courier will try and deliver your parcel(s) twice. After the second failed attempt, your goods will be returned to our warehouse. If you would like us to try and deliver them again, we will charge the delivery charges associated with your order again.

Delivery Surcharges For Larger Items

For some larger items, delivery surcharges may apply to the following areas: Scotland, Wales, Channel Islands, Isle Of Wight, Cornwall, Ireland, North Of England above Leeds. Call us on 01323 639335 to check before ordering.

Spread The Cost With Finance

If you're set on buying your new instrument, there's no need to get weighed down by the total cost of it straight away. If you break it down into monthly payments over time, it's much more manageable than you might think. And our fixed interest rates mean you'll know exactly what you're paying from the start.

How it works
The finance options available are displayed on our individual product pages - just click the button under the price to see the available options for each product. Finance is available for most new and used instruments over £400.

Pay a fixed deposit, and the rest is split into monthly payments. At the end of your contract when you've made your final payment, the instrument or equipment is all yours. You could own that dream guitar, piano or keyboard sooner than you thought!

Which Finance Options Are Available?
Most products on our website show the available finance options. Some are interest free, and some are interest bearing. The options shown on the site are an example of what is available - if you would like to pay over a different period, give us a call on 01323 639335 and we’ll try and arrange a finance option that suits your budget.

How To Apply For Finance

To apply for finance, please add the product to your cart, proceed through checkout and select 'Apply For Finance' as your payment option where you can complete the application form online.

The Lender
Bonners Ltd acts as a credit broker and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Bonners Ltd is authorised and regulated by the Financial Conduct Authority. Our registration number is 718966. Bonners Ltd is registered in England and Wales 1994113. Registered office 34 North St, Hailsham, East Sussex BN27 1DW.

Secure Trust Bank is registered in England and Wales 541132. Registered office: One Arleston Way, Solihull, B90 4LH. Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority. Registration number: 204550.

Not all products offered by Secure Trust Bank T/A V12 Retail Finance are regulated by the FCA

See & Try In Store

*Piano Cabinet Finishes Of Showroom Models May Vary

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We are only too happy to try and match a legitimate UK based musical instrument retailer’s quote. We have been in business for over 30 years and will always do our best to be as competitive as possible.
If you have seen a product that you wish to purchase cheaper on another UK based retailer’s website or shop, please call us on 01323 639335 or complete the form below. We will try and match (or beat) their quote – and still give you our award-winning service.
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