Luxman SQ-505X

The Luxman SQ-505X is a premium vintage solid-state integrated stereo amplifier produced by the renowned Japanese manufacturer Luxman between 1971 and 1974. It is highly regarded for its warm, tube-like acoustic signature and elegant brushed-aluminum faceplate encased in a signature wooden cabinet. Key Specifications Power Output: 30 Watts RMS per channel into 8 ohms (both channels driven) Total Harmonic Distortion (THD): Less than 0.04% at rated 30W output Frequency Response: 10Hz to 60kHz (within \(-1\text{dB}\)) Damping Factor: 30 into 8 ohms Input Sensitivity: 2mV (Phono 1 & 2), 80mV (Aux 1, 2, & 3) Phono 1 Input Impedance: Selectable options of 30kΩ, 50kΩ, or 100kΩ Signal-to-Noise Ratio (S/N): Better than 63dB (Phono), better than 80dB (Line) Semiconductors: 31 transistors, 2 diodes, and 4 varistors Dimensions: 450mm Wide \(\times \) 160mm High \(\times \) 268mm Deep Weight: 10 kg (22 lbs) Advanced Features & Controls Lux Type NF Tone Controls: Features independent bass and treble adjustments equipped with selectable turnover frequency points (Bass: 150Hz/300Hz/600Hz; Treble: 1.5kHz/3kHz/6kHz). Pre/Main Split: Includes rear jumper pins acting as a separator to let you safely run it exclusively as a dedicated preamplifier or power amplifier. Audio Attenuator: Built-in \(-18\text{dB}\) muting switch for immediate volume reduction. Dual Tape Monitoring: Dual input and output tape loops supporting direct deck-to-deck dubbing.