Studio JTM Combo
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Studio JTM Combo

The Studio JTM Combo (ST20C) is a 20W all-valve 1x12 guitar combo made in the UK, switchable to 5W. It suits players who want a compact amp with 1960s JTM45-style tone for home, rehearsal, studio or stage use.

  • 20W all-valve combo, switchable to 5W
  • 1x12" Celestion G12M-65 Creamback speaker
  • Single channel with two voices
  • Series effects loop and DI output
  • Preamp: 2 x ECC83; power amp: 2 x 5881
  • Designed, engineered and made in the UK
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Beschreibung

The ST20C is a single-channel, two-voice valve combo built around two ECC83 preamp valves, an ECC83 phase splitter and a pair of 5881 power valves. Output can be switched between 20W and 5W, so the same amp can be used at low volume at home or pushed harder in a rehearsal room or on stage. Tone is shaped with Normal/Loudness II and High Treble/Loudness I inputs and controls, plus Treble, Middle, Bass and Presence.

The cabinet holds a single 12-inch Celestion G12M-65 Creamback (16Ω, 65W). Styling follows the 1960s Marshall look, with a solid metal coffin logo and gold piping and beading. The amp is built at the maker's factory in Bletchley, England.

For connection there are four 1/4" instrument inputs with high and low sensitivity, a series-switchable effects loop and a DI output on a 1/4" jack. Speaker outputs are five 1/4" jack sockets covering 16Ω, 8Ω and 4Ω loads. A detachable power cable is included.

Video

Technische Daten

Marke
Marshall
Modell
Studio JTM Combo
Kategorie
Live-Sound › Verstärker

General

Model
ST20C
Range
Studio
Technology
Valve
Channels
2, bridgeable
Colour
Black

Audio

Output wattage
20W (with power reduction option to 5W)
Built-in effects
None
Controls
Normal/Loudness II, High Treble/Loudness I, Treble, Middle, Bass, Presence

Speaker

Speaker configuration
1x12"
Speaker model
Celestion G12M-65 Creamback (16Ω, 65W)
Power handling
65W
Unit impedance
16Ω

Valves

Preamp valves
2 x ECC83, 1 x ECC83 (phase splitter)
Power amp valves
2 x 5881

Inputs

Instrument inputs
4 x 1/4" jack (high/low sensitivity)

Outputs

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

Connectivity

Effects loop
Yes, 1 x series switchable

Physical

Weight
17.8 kg / 39.2 LB
Width
500 mm / 19.7"
Height
460 mm / 18.1"
Depth
265 mm / 10.4"
Country of origin
Designed and engineered in UK. Made in UK.

In the box

Box contents
Detachable power cable included

Daten: marshall.com; Fotos: Marshall product page · aktualisiert 2026-10-14 · Fehler gefunden? Schreib uns