Marshall Studio Series JTM ST20H 20-Watt Tube Guitar Amplifier Head
SKU: 74411769756

Marshall Studio Series JTM ST20H 20-Watt Tube Guitar Amplifier Head

Sale price$607.50 Regular price$675.00
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Description

Marshall Studio Series JTM ST20H 20-Watt Tube Guitar Amplifier HeadThe Marshall Studio Series JTM ST20H Tube Amp Head is a powerful new member in Marshall Amps' esteemed Studio amplifier range. Reimagining the first Marshall heads ever created even before the rock cornerstone 1959 SLP the Studio JTM, available in head, cabinet, and combo configurations, represents a modern interpretation of a classic amplifier. Jim Marshalls history in making amplifiers began with the JTM amplifier, a valve powered guitar head styled

The Marshall Studio Series JTM ST20H Tube Amp Head is a powerful new member in Marshall Amps' esteemed Studio amplifier range. Reimagining the first Marshall heads ever created - even before the rock cornerstone 1959 SLP - the Studio JTM, available in head, cabinet, and combo configurations, represents a modern interpretation of a classic amplifier.

Jim Marshall’s history in making amplifiers began with the JTM amplifier, a valve-powered guitar head styled after early American tweed combos that were being turned up for the first time; a groundbreaking sound that many Brits also wanted to get their hands on. Quite obviously the rest is history, with this new amplifier paving the way for the Marshall sound.

Through the Studio series of amps, Marshall has finally satisfied the request long asked for by many players - and sound engineers: make a vintage Marshall smaller, lighter, and quieter while still retaining the sonic DNA of its larger siblings. This successful line of UK-made tube heads and combos is now furthered with the JTM circuit now available in the Studio series.

The Studio Series JTM 20-watt head shares the same front panel controls as the original JTM, with two independent channels - High Treble and Normal - sharing a master presence control and three-band EQ. Each channel employs a low and high input, both channels can be used simultaneously just as a vintage Marshall would have been. Simply run a patch lead out of one channel’s input into the other channel or run a Y-cable. The Studio series JTM also features the original Marshall “coffin” logo and is dressed in a sleek black tolex and fawn grill covering, just as the vintage JTM amplifier was.

The JTM receives the Studio Series treatment by way of a low power/high power option disguised in the amp’s standby switch, allowing the player to select between a full 20-watt output or a scaled down five watts. On the back panel are a 4-, 8-, and 16-Ohm speaker outputs, a 1/4” DI out, effects loop on/off selector switch, and effects loop send and return - all features unique to the Studio Series.

In the US we call them “Tubes” and in the UK they’re “Valves”. (The “tube” is the subway in England.) Potato, pot-ah-to, this amp is all-tube driven with the same complement as the vintage JTM - two 5881s in the power section, two 12AX7s (UK calls them ECC83) in the preamp, and a single 12AX7 phase splitter.

The Studio Series JTM amplifier is here, putting the sound of the 1960s and the dawn of rock and roll and the hands of today’s players all around the world.

Shop More Amplifiers:

  • Modern Reinterpretation of the Classic JTM Amplifier
  • Two Independent Voiced Channels - High Treble and Normal
  • 20-Watt Output with Option to Scale Down to 5 Watts
  • Includes Original Marshall “Coffin” Logo and Black Tolex
  • Designed with 4-, 8-, and 16-Ohm Speaker Outputs
  • Comes with 1/4” DI Out, Effects Loop On/Off Selector
  • All-Tube Driven, Features Two 5881s and Three 12AX7s
  • Brings the 1960s Rock and Roll Sound to Today's Players
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 74411769756

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M
Waukegan, US
★★★★★ 4
Lightweight and Comfortable, but very thin
Color: Black, Size: Large
I used the Lapulas Merino Wool Quarter Socks for Men on a Europe trip where I was walking pretty much all day, and overall they performed well. The biggest thing to know right away is that they are very thin. If you’re expecting thick, cushioned socks, these are not that. They feel more like a lightweight layer rather than something padded. That said, the thinness actually worked in my favor for travel. Even after long days of walking, my feet didn’t feel overly sweaty or damp. They seem to handle moisture pretty well, and I didn’t get that uncomfortable “wet sock” feeling, which is a big plus when you’re constantly on the move. They’re also surprisingly decent at regulating temperature. They’re not thick, but they still help keep your feet warm when it’s a bit cold, while staying breathable enough during the day. It’s more of a balanced, all-day comfort rather than heavy insulation. One thing I noticed is that they stretch out a bit after the first use. They’re snug at first, but after wearing them for a day, they loosen slightly. It’s not terrible, but it’s noticeable, especially since they’re already thin. Also, proper care really matters with these. Since they’re merino wool and lightweight, I’d recommend being careful with washing and drying—gentle wash and air drying is probably the best way to maintain the shape and quality. Throwing them in a regular hot wash/dry cycle will likely wear them out faster or affect the fit. Because they’re thin, they fit nicely inside shoes without feeling tight or bulky, which I appreciated when wearing sneakers for long periods. Pros: -Lightweight and comfortable for all-day walking -Good moisture control, feet don’t feel damp -Breathable and not too hot -Helps keep feet warm despite being thin -Easy to pack for travel Cons: -Very thin, not much cushioning -Slightly loosens after first use -Requires careful washing and drying
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
H
Verified Purchase
hstoner
Grantham, US
★★★★★ 3
Too stretchy for my preference
Color: Black, Size: Large
The socks seem to be high quality, but they are too stretchy for my liking. They feel like "compression" socks, and become too thin and stretched when worn (yes I bought the correct size). Even though they have less Spandex than my preferred wool socks (e which are no longer available), they are much stretchier.
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Reviewed in the United States on April 9, 2026
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Amazon Customer
Omaha, US
★★★★★ 5
Thick and comfortable
Color: Black, Size: Medium
These socks fit 7.5 wide size woman's shoe wearer perfectly. Socks are thick and comfy. They stay in place all day. I got rid of all my old socks and it is a pleasure not having to scrounge for a matching pair. They wash and dry well in machine on wool setting.
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Reviewed in the United States on May 17, 2026
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Jennifer Grady
Whiting, US
★★★★★ 5
Very pleased!
Color: Black, Size: Medium
Good fit, good thickness, keeps feet warm and dry, no uncomfortable seams. I've only washed them twice, but will return if items don't hold up. So far they're proving to be a good investment.
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Reviewed in the United States on April 4, 2026
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Donald Falk
Fort Morgan, US
★★★★★ 1
Garbage socks.
Color: White, Size: Medium
After wearing a couple times there is a hole in the heel. I think they're made of tissue paper;
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Reviewed in the United States on April 10, 2026

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