A.M.P. Mini Amp 2 (Walter Woods MI-100-4) Late 70s RARE

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Rare Late 70s A.M.P. Mini Amp 2 (Walter Woods MI-100-4) approx. 100-watt stand-up bass amp! Physical wear but working well.

This is an early Walter Woods–designed compact solid-state amplifier head, built in California in the late 1970s to early 1980s, known for delivering unusually high clean power from a very small enclosure.

Type
Solid-State Amplifier Head

Model
A.M.P. Mini Amp 2 (MI-100-4)

Manufacturer
Walter Woods / A.M.P. (Associated Music Products)

Country of Manufacture
United States (Van Nuys, California)

Era
Late 1970s – Early 1980s

Wattage
Approximately 100–120 watts RMS
(roughly ~75W at 8 ohms, up to ~120W at 4 ohms)

Controls
Input Volume, Master Volume, Lows (Bass), Middles (Midrange), Highs (Treble), “More / Same / Less” EQ switches for lows and highs

Input
Two 1/4" inputs (Loud / Instrument and Soft sensitivity)

Output
Dual 1/4" speaker outputs (minimum 4 ohms load)

Power Supply
Internal (115V AC, fixed power cable)

Notable Features

• Early ultra-compact high-power amplifier design (“mini amp” format)
• Handbuilt by Walter Woods, a pioneering boutique amp designer
• Designed primarily for upright bass and clean instrument amplification
• Extremely clean, hi-fi, high-headroom sound
• Discrete solid-state circuitry (FET-based preamp with solid-state power section)
• One of the earliest examples of high-power performance in a portable chassis
• Distinctive red anodized aluminum chassis with compact stacked construction
• Very low production numbers; considered rare and collectible
• Often associated with professional jazz and upright bass players for its clarity and portability

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