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Marshall SV20H Studio Vintage Plexi 20W Valve Amp Head

A Portable, Mini Head Version Of The Legendary 1959SLP "Plexi" Amp



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Product Description

The Marshall SV20H Studio Vintage is a mini head version of one of the most popular guitar amps in history, and arguably the one that put Marshall on the map - the 1959SLP "Plexi"!

Now available in a portable 'Studio Vintage' format, the all-valve SV20H pays homage to the legendary Plexi formula with its single-channel design, four High/Low sensitivity inputs and classic styling.

Authentic Plexi Tones

Since the '60s, Marshall's Plexi amplifiers have been used some of the world's most renowned guitar heroes, including Jimi Hendrix, Eddie Van Halen, Jimmy Page and John Frusciante.

There's a reason why so many famous guitarists love the crunchy sound of an EL34-driven Plexi, and when you plug into one and crank it - you'll hear why! They're clear and crisp with plenty of punchy mid-range, meaning that you can effortlessly cut through any band mix with oodles of sustain. Your fiery riffs and solos will be singing for days!

Power Reduction

One of the Studio Vintage's coolest features is its power reduction switch. Letting you power down from the full 20W to 5W, the lower wattage allows you to drive the tubes harder at quieter volumes so that you can still attain those gnarly, saturated cranked valve amp sounds at bedroom levels!

DI Output & Effects Loop

The Marshall SV20H Studio Vintage is equipped with a DI output, which allows you to plug the amp directly into your recording interface and capture its tones with an emulated mic'd up cab sound. This is what makes the SV20H so versatile and studio-friendly - hence the name!

If you're a stompbox fanatic, the SV20H can serve as an excellent pedal platform with its dedicated effects loop. Just plug your favourite modulation and time-based pedals in via the loop and enjoy seamless sonic bliss!



  • Model: SV20H
  • Range: Studio
  • Technology: Valve
  • Channels: 1


  • Output Wattage: 20W (with power reduction option to 5W)
  • Outputs: 5 x 1/4” jack sockets, selectable 16Ω / 8Ω / 4Ω load
  • Inputs: 4 (2 x high, 2 x low) "Lead and Bass"
  • Controls: Low/High power mode selection switch, presence, bass, middle, treble, high treble/loudness I, normal/loudness II
  • Effects: None
  • Effects Loop: Yes, series, send/return


  • Preamp Valves: 2 x ECC83, 1 x ECC83 (phase splitter)
  • Power Amp Valves: 2 x EL34


  • Cable: Detachable power cable included, speaker cable included


  • Weight: 9.25kg / 20.4 lbs
  • Width: 500mm / 19.7"
  • Height: 240mm / 9.4"
  • Depth: 230mm / 9.1"
Elliot Stent author picture

Written by Elliot Stent

Customer Reviews


8 reviews





Mr Alec Hoare1st Aug 2023

The traditional sound I wanted. Make no mistake this amp is LOUD. Using mine with a Toneking Ironman attenuator through a Marshall 2 x 12 cabinet. Other than that I have a Rat pedal to tone in a small amount of distortion (when needed) and, a Wampler Tumnus for overdrive boost on solos.

Value 5Looks 5Sound 5

Mr Rui Moura25th Dec 2020

Um marshall clássico simplesmente fantástico. Atenção que é um no master volume, por isso não é um amp de bedroom level. Para quem quer tocar em casa terá de ter um atenuador com um grande nível de atenuação. Sim simplesmente fantástico!!!

Value 4Looks 4Durability 3

Mr Pasquale Andreano21st Jan 2020

It just does what it says on the tin... One hiccup... there is not one in sight, just great vintage tone on tap.

Value 5Looks 5Sound 5

Trusted Customer22nd Dec 2019

Very very loud head... I wish that you add a recommendation of buying an attenuator along. Sound is great though and as expected...

Value 5Looks 5Durability 5Sound 4

Jerome Toulza17th Nov 2019

This is the vintage tone I had in my head fro so long!

Value 5Looks 5Durability 5Sound 5

Mr Mick Di Trana31st Aug 2019

I was smitten when I saw Tom Quayle's YouTube review. Happy to say I was not disappointed when I plugged in a LP Custom and cranked the amp!

Trusted Customer3rd May 2019

Very loud for 20 watts. It's a good amplifier, but it takes some experience to set it up. Using the high treble or normal channels individually results in an ultra bright or very dark sound respectively. Jumping the channels is the only way to go.

Mr Stuart Peplow15th Feb 2019

Brilliant product great service

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Andertons Music Company's Registered Office: 58-59 Woodbridge Road, Guildford, GU1 4RF. Andertons Music Company acts as a credit broker and not a lender and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority. Andertons Music Company is authorised and regulated by the Financial Conduct Authority, firm registration number 716155. Credit provided subject to age and status.