Marshall ST20H Studio JTM 20/5 Watt Tube Head

The Marshall ST20H Studio JTM is a compact 20‑watt (switchable to 5‑watt) all‑value tube head inspired by the classic JTM45 tone. Equipped with dual 5881 power tubes, three ECC83 preamp/phase-splitter tubes, a single-channel design with Normal and High Treble voices, 3-band EQ and Presence, plus a speaker-emulated DI and series FX loop. Crafted with vintage style and modern utility, it delivers legendary British tone in a portable form factor.

SPECIFICATIONS:

• Model: ST20H (Studio JTM)
• Power Output: 20 W RMS, switchable to 5 W for lower-volume play 
• Tubes:
  • Preamp: 2× ECC83 + 1× ECC83 phase splitter
  • Power Amp: 2× 5881 
• Channel: Single-channel with dual inputs (Normal & High Treble voices) 
• EQ & Controls: Bass, Middle, Treble, Presence
• Features:
  • Series FX loop with bypass switch
  • Speaker-emulated DI output for direct recording or PA use
• Inputs:
  • 2× ¼″ Normal input jacks
  • 2× ¼″ High Treble input jacks 
• Outputs:
  • 5× ¼″ speaker outputs (4 Ω, 8 Ω, 16 Ω options)
  • 1× ¼″ DI output
• Construction: UK-built finger-jointed plywood chassis with vintage Marshall styling (levant front, gold piping, “coffin” logo) 
• Dimensions: 500 × 230 × 240 mm (19.7″ × 9.1″ × 9.4″) 
• Weight:  9.25 kg