Luxman L-510X (1983)
The Luxman L-510X is an integrated amplifier released in December 1983 at ¥139,000. It belongs to the company's "Status Series" along with the L-530X and L-550X, and it shares its circuit structure with the L-530X. It is Luxman's refined single-stage amplifier approach, a development of their duo-beta concept. High-gm, low-noise FET inputs keep the voltage amplification stage to just one. The ground circuit got particular attention, with the power-supply reference amplifier removed in favor of a clean-earth reference design.
The L-510X is rated at 100W + 100W into 8Ω (both channels driven, 20 Hz - 20 kHz) with total harmonic distortion of 0.008% or less. It weighs 14.3 kg and measures 453 × 162 × 430 mm. The phono stage handles both MM (2 mV sensitivity, 50kΩ) and MC cartridges (100 μV, with loading options of 40Ω, 100Ω, or 300Ω). The MC side uses a symmetric differential push-pull configuration built around specially developed FETs. Signal-to-noise is rated at 110 dB or better on line inputs.
The tone control system offers six selectable turnover points in both the low range (77 Hz through 880 Hz) and high range (880 Hz through 10 kHz), with ±8 dB maximum variation. The tone control circuitry taps the NFB loop of the power section to avoid noise and quality degradation. There is also a warm-up indicator that extinguishes once the circuit stabilizes, a phono straight switch, subsonic and high-cut filters, two tape monitor loops with bidirectional dubbing, and a pre/main separation function.
The power supply uses a large E/I core transformer and block capacitors. Owners document one quirk: a wooden spacer glued between the transformer and rear panel. It is factory-original. It is apparently a workaround for a manufacturing error where the rear panel subcontractor missed its dimension by 4 cm against the front panel.
Documentation is thin. No service manual is known to exist for the X models specifically, and one owner notes the L-510X and L-530 share a manual. What separates the L-510X from the non-X L-510 is still forum speculation. The two are said to differ internally and in sound, and the rear panels are visibly different, but no authoritative source confirms the extent of the changes. One seller claims the L-510X does not operate in class A at all, unlike the L-510. That is a marketplace claim, not an official spec, and should be treated as unconfirmed.
Owner opinions run hot and cold. One Russian forum user dismissed the L-510X as "made with an axe," while another described the sound as "like from a log." Others have pushed back, noting the wooden spacer is a legitimate factory part and linking to Japanese retail listings as evidence. Owners also pass along a practical tip: the plastic nut bodies on the speaker terminals can crack from over-tightening and age. Replacing just one terminal is impractical, so owners typically swap the full set.
Known specifications:
- Output: 100W + 100W (8Ω, 20 Hz - 20 kHz, both channels driven)
- THD: 0.008% or less (8Ω, −3dB)
- Frequency response (line): 10 Hz - 100 kHz, −1dB
- Input sensitivity: Phono MM 2mV / Phono MC 100μV / Line 150mV
- Dimensions: 453 × 162 × 430 mm (W×H×D)
- Weight: 14.3 kg
- Power consumption: 220W
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Similar items on eBay
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