Ampeg V4-B Head vs Gallien-Krueger Fusion 500 S

The Ampeg V4-B Head and the Gallien-Krueger Fusion 500 S are both amplifiers sharing transparent, harmonically rich. The Ampeg V4-B Head leans smooth and warm. Current prices: $1535.60 vs $1199.

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.

40% — somewhat different

Shared tone character
citedDerived from overlapping tonal signals across both listings.
  • transparent
  • harmonically rich
Citation fame
citedCitation/mention fame — how often this gear is cited across artist rigs and gear discussion.
0%
17%
Price

$1535.60via Reverb

$1199via Reverb

Description

The Ampeg V4-B is a 100-watt all-tube bass amplifier head using four 6L6 power tubes, originally introduced in 1971 as a lower-wattage alternative to the 300-watt SVT. It shares the SVT preamp circuit in a lighter package, delivering Ampeg's characteristic warm deep low-end, slightly scooped mids, and SVT harmonic richness at volumes more manageable than its larger sibling. At 100 watts it enters power-tube saturation earlier, producing natural tube compression and creamy overdrive when pushed. It suits rock, blues, and studio players who want full SVT character without the weight and maintenance demands of a six-tube power section.

The Gallien-Krueger Fusion 500 S is a 500-watt hybrid bass amplifier head from Gallien-Krueger, combining a 12AX7 tube preamp section with a lightweight Class D solid-state power amp section. The Fusion series blends GK clarity and punch with tube warmth in the preamp stage, offering bass players a versatile tonal option between fully solid-state and fully tube amplification. At 500W the Fusion 500 handles stage volumes for medium venues.

Genres
citedGenres this gear is documented as being used in.
  • Soul
  • Blues
  • Alternative Rock
  • Rock
  • jazz fusion
Tonal lean
  • smooth
  • warm
  • edge of breakup
—
Good for
citedOccasions this gear suits — judged per model, or derived from its wattage, connectivity and category.
  • Live
  • Studio
  • Live
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