Quad 303 _Power amplifier

early 70s

Made in the UK 🇬🇧

A true icon of British hi-fi, the Quad 303 stands out with its clean, almost brutalist aesthetic—minimal, functional, and effortlessly timeless. Designed as a reference power amplifier, it delivers a smooth, controlled and highly musical sound that made it legendary.

Still in production in 2026, it’s a rare example of a design that never needed reinvention—just refinement.

Since these photos, the unit has been fully restored: recapped and upgraded with gold-plated RCA inputs for optimal performance and long-term reliability.

Specifications

Power output: 45 watts per channel into 8Ω (stereo)

Frequency response: 30Hz to 35kHz

Total harmonic distortion: 0.1%

Input sensitivity: 0.5V

Signal to noise ratio: 100dB

Speaker load impedance: 4Ω to 16Ω

Dimensions: 120 x 159 x 324mm

Weight: 8.2kg