Quad 303 Power Amplifier Vintage Early Serial Number UK Good Working Order

Quad 303 power amplifier in good working order, early serial number. Clean overall with only minor marks.

The Quad 303 is a solid-state stereo power amplifier made by the Acoustical Manufacturing Company in Huntingdon, England, designed to partner with the Quad 33 preamplifier.

Key specifications

• Amplifier Topology: Class AB, solid-state (Triples output stage)
• Frequency Response: 20 Hz – 20 kHz (±0.3 dB)
• Total Harmonic Distortion (THD): <0.002% (1 kHz)
• Loudspeaker Impedance Range: 4–16 ohms
• Speaker Output: Gold-plated 4mm binding posts (stereo pair)

Specifications

• Audio Inputs: 2
• Audio Outputs: 1
• Colour: Silver
• Country of Origin: England
• Year Manufactured: 1960s
• Connectivity: 5-pin DIN input
• Mains Voltage: 240V
• Amplifier Topology: Class AB, solid-state (Triples output stage)
• Input Types: 1x RCA (single-ended), 1x XLR (balanced)
• Speaker Output: Gold-plated 4mm binding posts (stereo pair)
• Loudspeaker Impedance Range: 4–16 ohms
• Frequency Response: 20 Hz – 20 kHz (±0.3 dB)
• Total Harmonic Distortion (THD): <0.002% (1 kHz)
• Signal-to-Noise Ratio: >108 dB (A-weighted)
• Input Sensitivity: 700 mV RMS (RCA), 1.5 V RMS (XLR)
• Maximum Output Current: 10A
• Dimensions (W × H × D): 325 × 176 × 120 mm
• Weight: 8.4 kg