Blackstar ST. James 100 Head vs Hiwatt SA20H Custom 20W Studio Head

The Blackstar ST. James 100 Head and the Hiwatt SA20H Custom 20W Studio Head are both amplifiers sharing transparent, tight, dynamic. The Blackstar ST. James 100 Head leans crunchy and bright.

Similarity
citedBlended from circuit-archetype lineage, dynamic feel, tone-signal overlap and tone-vector distance — the tone vector itself is derived from editorial description text, not a measured acoustic signal, so this reflects how similarly the catalog copy describes the two, not a lab measurement. Shown only within a gear class, and only where there's enough evidence to be meaningful.

72% — moderately similar

Shared tone character
citedDerived from overlapping tonal signals across both listings.
  • transparent
  • tight
  • dynamic
Citation fame
citedCitation/mention fame — how often this gear is cited across artist rigs and gear discussion.
0%
0%
Price

$1746.60via Reverb

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Description

The Blackstar St. James 100 is a two-channel EL34-powered tube guitar amplifier head combining American-voiced clean tones with British-voiced overdrive, designed as a lightweight handcrafted valve head with features including a sag control, effects loop, and reverb. Channel 1 delivers big, open clean tone with clear black-panel-influenced headroom; Channel 2 produces British crunch that leans toward Vox chime and articulation rather than Marshall darkness, making it unsuitable for saturated high gain but excellent for chimey, cutting rock and blues. Reviewers describe the EL34 version as combining world-class British crunch with US-sounding clean tones in a design notably lighter than comparable valve heads.

The Hiwatt SA20H Custom is a 20-watt studio guitar amplifier head from Hiwatt's Custom series, delivering the brand's characteristically clean, powerful headroom and articulate British tone at a studio-friendly wattage. Built with Hiwatt's traditional emphasis on clarity and dynamic response over built-in gain, it's aimed at players wanting genuine Hiwatt tonal character without the volume of the brand's larger flagship heads.

Genres
citedGenres this gear is documented as being used in.
  • Rock
  • Alternative Rock
  • Jazz
  • Funk
  • Classic Rock
  • Blues
  • blues
  • jazz
  • rock
Tonal lean
  • crunchy
  • bright
  • saturated
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Good for
citedOccasions this gear suits — judged per model, or derived from its wattage, connectivity and category.
  • Live
  • Practice
  • Studio
  • Worship
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