Marshall ST20C Studio JTM 20/5 Watt Tube Combo Amp

The Marshall ST20C Studio JTM delivers vintage British tone in a compact 20 W (switchable to 5 W) all-valve combo. Loaded with dual 5881 power tubes and a Celestion G12M-65 Creamback 12″ speaker, it authentically captures the iconic JTM45/2245 sound. Equipped with dual inputs, 3-band EQ, Presence, series FX loop, DI output, and UK-built quality—it’s perfect for studio, stage, or home use.

SPECIFICATIONS:

• Model: ST20C (Studio JTM)
• Power: 20 W RMS, switchable to 5 W at flip of switch
• Speaker: 1× 12″ Celestion G12M‑65 Creamback, 16 Ω 
• Tubes:
  • Preamp: 3× ECC83 (12AX7)
  • Power: 2× 5881 (JTM-style) 
• Channels: Single channel with two input voices (High Treble & Normal) 
• Controls: Bass, Middle, Treble, Presence, dual Loudness knobs per voice 
• Features: Series FX loop (switchable), speaker‑emulated DI output 
• Inputs / Outputs:
  • 2× ¼″ inputs (High/Low)
  • 5× ¼″ speaker outs (4/8/16 Ω)
  • 1× ¼″ DI output
• Construction: Hand-built in UK, vintage aesthetic (coffin logo, gold piping, fawn fret) 
• Dimensions: 500 × 460 × 265 mm
• Weight: ~21 kg (39 lb)