The Onkyo Integra M-504 is a vintage dual-mono stereo power amplifier produced from 1987 to 1997. It is widely celebrated for its warm, detailed sound quality and iconic large green fluorescent VU meters.

Key Specifications

• Power Output: 165 watts per channel into 8 ohms (stereo)

• Frequency Response: 1Hz to 100kHz

• Total Harmonic Distortion (THD): 0.003%

• Damping Factor: 140

• Dimensions: 18.3″ W × 7.2″ H × 16.6″ D (465 × 185 × 422 mm)

• Weight: 50 lbs (22.5 kg)

• Notable Features: Dual-mono configuration, a 5-watt Class A operation mode for lower volumes, and rosewood-look side panels.

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sn.

7008005470

restored all speaker relays (3)

main filter caps - all tested good.

re-solder main PCB

Meter lamps replaced with LED

bias calibrated.

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