Studio 900 Combo
Marshall Discontinued

Studio 900 Combo

A 20W two-channel valve combo amp from Marshall's Studio range, based on the JCM900 and built in the UK. It has a 1x12" Celestion speaker, built-in spring reverb and an effects loop, and suits guitarists who want crunch tones at studio or stage volumes.

  • 20W valve combo with 5W and <1W attenuation
  • Two channels, based on the JCM900
  • Celestion G12T-75 12" speaker (16Ω, 75W)
  • Built-in spring reverb and effects loop
  • DI and compensated DI outputs
  • Made in UK, weighs 17.9 kg
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Description

The Studio 900 Combo is a compact two-channel guitar combo that carries over the sound of the JCM900 in a 20W format. The signal path uses two ECC83 preamp valves and an ECC83 phase splitter, with two 5881 valves in the power stage. The design pairs valve circuitry with solid-state components.

Each channel can be set up with its own settings, so the player can move between a clean sound and crunch sounds. Controls cover gain, EQ and volume, and a spring reverb is built in. A power attenuation switch lowers the output from 20W to 5W or below 1W for quieter playing. An effects loop is also fitted.

The amp has five 1/4" speaker output jacks covering 16Ω, 8Ω and 4Ω loads, plus a DI output and a compensated DI output for recording. The built-in speaker is a Celestion G12T-75 in a black cabinet. The amp is designed, engineered and made in the UK at Marshall's Bletchley factory.

Video

Specifications

Brand
Marshall
Model
Studio 900 Combo
Category
Guitars and basses

General

Model
SN20C
Range
Studio
Channels
2
Technology
Valve
Colour
Black

Audio

Output wattage
20W (with power reduction to 5W), <1W
Reverb
Built-in spring reverb
Effects loop
Built-in

Valves

Preamp valves
2 x ECC83
Phase splitter
1 x ECC83
Power amp valves
2 x 5881

Speaker

Speaker configuration
1 x 12"
Speaker model
Celestion G12T-75 (16Ω, 75W)

Outputs

Speaker outputs
5 x 1/4" jack sockets (16Ω load / 8Ω load / 4Ω load)
DI output
Yes
Compensated DI output
Yes

Physical

Weight
17.9 kg / 39.5 LB
Width
510 mm / 20.1"
Height
460 mm / 18.1"
Depth
255 mm / 10"
Country of origin
Designed and engineered in UK. Made in UK.

Data: marshall.com; photos: Marshall product page · updated 2026-10-14 · Found a mistake? Write to us