classic large-format chrome/silver unit combining optical wah and fuzz (often associated with players like Cliff Burton of Metallica or Jerry Garcia for its massive sweep and gritty tone)

Key Features & Design

•  Type: Optical Wah + Fuzz (Fuzz circuit before Wah, like the original)

•  Circuit: Electro-optical (uses light-dependent resistor/LDR + bulb/shade mechanism instead of a potentiometer for smooth, durable operation—no pot wear)

•  Enclosure: Heavy-duty chrome-plated steel, large “brick” form factor (very rugged and heavy, often described as dictionary-sized)

•  Controls (visible in your image):

•  Intensity (Fuzz gain/amount)

•  Tone (or Level on some variants; treble/voicing for fuzz)

•  Separate footswitches for Wah and Fuzz engagement

•  Power switch (often at the toe)

•  Power: Original AC mains (typically 120V, with internal transformer; some export 220V versions). Many have been modded over time for 9V DC battery/adapter use. 

•  Dimensions: Approx. 9–10” long x 5–6” wide x 2.5–3” high (varies slightly by era)

Operation

•  Wah and Fuzz can be used independently or together for massive fuzz-wah tones.

•  Wide frequency sweep, powerful and expressive.

•  Fuzz character: Aggressive, vintage-style (reminiscent of Fuzzrite/Si transistor tones), great for rock, metal, blues, and bass.