Pricing and availability
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Price
Average Price: $1,321
High-end/Boutique
$300
$701+
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Budget
Standard
High-end
Price History
Based on price data from 5 merchants for "Marshall ST20C Studio JTM". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Introducing the Marshall ST20C Studio JTM, a guitar combo amplifier that carries the legacy of the original JTM45's iconic sound in a compact design. A part of the Studio range, this combo is built to deliver a smooth, valve-driven breakup at lower volumes, making it perfect for both home and studio use. Don't let the size deceive you, the all-valve tone of the Studio JTM packs a punch, just like the original 30W head.
It features two ECC83 preamp valves, two 5881 power amp valves, and one ECC83 phase splitter, taking you on a nostalgic journey back to the rock 'n' roll renaissance. The combo is equipped with a single 12" G12M-65 Creamback Celestion speaker, known for handling greater power and producing additional low-end grunt that complements the warm and vocal mid-range crunchy upper.
The power switching feature allows you to effortlessly toggle between 20W and 5W, while two loudness controls give you the freedom to play as loud as you want. The Studio JTM also offers modern-day features like a DI out and FX loop.
Key Features:
- Compact design with the iconic sound of the original JTM45
- Two ECC83 preamp valves, two 5881 power amp valves
- Single 12" G12M-65 Creamback Celestion speaker
- Power switching between 20W and 5W
- Two loudness controls
- DI out and FX loop
- Authentic vintage tone for a definitive experience
- Enables channel patching for a world of all-valve tonal possibility
Product specs
| Type | Tube |
| Number of Channels | 2 |
| Output Power | 20W (5W) |
| Speaker Size | 1 x 12" Celestion G12M-65 Creamback |
| Preamp Tubes | 2 x 12AX7 (preamp), 1 x 12AX7 (phase) |
| Power Tubes | 2 x 5881 |
| EQ | 3-band EQ, Presence Control |
| Inputs | 2 x 1/4" (High Treble), 2 x 1/4" (Normal) |
| Outputs | 5 x 1/4" (4/8/16 ohms), 1 x 1/4" (DI out) |
| Effects Loop | Yes (on/off switch) |
| Power Source | Standard IEC AC cable |
| Height | 18.1" |
| Width | 19.7" |
| Depth | 10.4" |
| Weight | 39.2 lbs. |
FAQs
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What type of music is the Marshall ST20C Studio JTM Combo best suited for?
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The Marshall ST20C Studio JTM Combo is ideal for classic rock and blues, offering the iconic Marshall tone with warm, rich overdrive and a responsive clean sound that suits these genres well.
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Is the Marshall ST20C Studio JTM Combo suitable for home use?
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Yes, the Marshall ST20C Studio JTM Combo is suitable for home use, featuring a switchable power output from 20 watts to 5 watts, allowing for lower volume playing without sacrificing tone.
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Does the Marshall ST20C Studio JTM Combo have an effects loop?
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Yes, the Marshall ST20C Studio JTM Combo includes an effects loop with an on/off switch, enabling you to integrate external effects pedals seamlessly into your signal chain.
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How many channels does the Marshall ST20C Studio JTM Combo have?
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The Marshall ST20C Studio JTM Combo features two channels, providing both high treble and normal input options for versatile tonal shaping.
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What kind of speaker is used in the Marshall ST20C Studio JTM Combo?
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The Marshall ST20C Studio JTM Combo is equipped with a 12" Celestion G12M-65 Creamback speaker, known for its warm midrange and smooth, vintage-style sound.
Videos
Andertons Music Co
JTM Style Amp Shootout! | Does Marshall Still Come Out On Top?
JTM Style Amp Shootout! | Does Marshall Still Come Out On Top?
Andertons Music Co
Marshall Studio JTM - Marshall Have A New Amp
The Studio Rats
Marshall Studio JTM ST20C Demo | First Look
Premier Guitar
Robin Trower | Studio JTM Playthrough | Marshall
Marshall Amplification
Your New Favourite Plexi! | Let's Test The Marshall Studio JTM | ST20!
Peach Guitars
Hear The Studio JTM | No Talking Demo | Marshall
Marshall Amplification
Marshall Studio JTM ST20C Combo | Review | Guitar Interactive
Guitar Interactive Magazine
Marshall Studio JTM - What Is Inside?
The Studio Rats
Reviews
PROS
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No bad sound settings, versatile across all EQ levels
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Celestion Creamback 65 speaker enhances vintage Marshall tone
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Wide, thick cab design for a bigger sound impression
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Authentic vintage rock and soul tones at manageable volumes
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Great tube saturation without losing detail at low wattage
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Compatible with diverse overdrive and fuzz pedals
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Perfectly captures classic rock sounds like Clapton and Hendrix
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Compact size suitable for all playing situations
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High-quality craftsmanship and materials
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Inspiring and fun to play for a variety of styles
CONS
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Marshall ST20C Studio JTM.
Comparisons
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The ST20C is described as having a bigger, looser bottom end compared to the SV20C, which tends to be brighter and sharper.
Source
Features and functionality
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The ST20C is noted for being more usable at lower volumes due to its mellower high end, making it suitable for home use without needing an attenuator.
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The ST20C reportedly includes a better speaker than the 10-inch option in the SV20C, offering improved sound quality.
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The ST20C is noted for its clean sound until played at high volumes, at which point it transitions to a crunch rather than full distortion.
Source
Use cases and applications
Value and pricing
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In the UK, the ST20C is priced around £800-900, significantly cheaper than the US price of approximately $2000, highlighting a regional price discrepancy.
Source -
In the EU, the ST20C is considered a great value at €700-800, but outside these regions, it becomes less competitive, prompting some to recommend Ceriatone instead.
Source
Setup and maintenance
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Owners recommend installing a post-phase-inverter master volume (PPIMV) for better volume control, especially for home use, due to its cathode bias simplicity.
Source
Mods and upgrades
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Adjusting the amp's cathode resistor value is technically possible but could risk damaging the power transformer, suggesting caution with modification.
Source
Critic Reviews
Based on 0 Reviews and 0 Ratings
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