Luxman LV-104U (c. 1990)
The LV-104U is a fascinating hybrid from the Alpine/Luxman era, an integrated amplifier that pairs a vacuum tube driver stage with MOS FET output transistors. It was priced at ¥89,000 around 1990, during the partnership years when Alpine held a stake in Luxman. The design is unusual: a high-impedance FET input stage, a 3-pole vacuum tube driver stage, and a MOS FET power stage — Luxman's attempt to get tube-like richness and nuance while retaining solid-state grip and reliability.
Rated at 80W + 80W into 6 Ω with a claimed THD of just 0.008%, it was a serious performer on paper. The LV-104U also reflects its era's convergence of audio and video: it includes three video inputs with monitor jacks and permits dubbing from AV2 to AV1, using a wide-band video buffer amplifier to prevent image degradation during copies. A CD straight function bypasses unnecessary circuitry for cleaner digital playback.
Internally, Luxman deployed its STAR circuit topology, keeping power supply and ground lines separate for each circuit block to eliminate common impedance interference. A 230 VA "super regulation" transformer feeds the supply, and a constant-current heater circuit shields the tube stage from AC line fluctuations. It draws 170W and weighs a substantial 10.2 kg.
The phono stage handles both MM (2.0 mV / 47kΩ) and MC (150 μV / 100Ω) cartridges, with S/N ratios of 90 dB and 70 dB respectively. Line-level inputs (CD, Tuner, Line) are rated at 150 mV / 47kΩ with an excellent 110 dB S/N. Frequency response extends from 1 Hz to 200 kHz (-3 dB) on line inputs, and 20 Hz to 20 kHz (±0.3 dB) on phono. The AV inputs stretch to 10 Hz – 6 MHz. Dimensions are 438 × 148 × 353 mm.
Documentation on this model is thin. Production years are generally given as 1990–92, but little period press coverage has surfaced. Owner commentary, mostly from European and Russian classified listings, describes it as scarce and praises its blend of "tube softness and transistor punch." One used listing observed that "these LV-104U models are pretty scarce" among hybrid Luxman integrateds. It's a Japan-market unit (100V), which explains the frequent appearance of step-down transformers in listings.
Surviving information is otherwise sparse — no detailed service manuals have been digitized publicly, and no thorough period reviews have been located. What the record shows is a well-specified, genuinely hybrid amplifier from a transitional moment in Luxman's corporate history, one that rewarded the patient collector willing to deal with the 100V line voltage.
Known Specifications
- Rated output: 80W + 80W (6 Ω)
- THD: 0.008% (6 Ω, 1 kHz)
- Phono MM: 2.0 mV / 47kΩ, S/N 90 dB
- Phono MC: 150 μV / 100Ω, S/N 70 dB
- Line (CD/Tuner): 150 mV / 47kΩ, S/N 110 dB
- Frequency response (line): 1 Hz – 200 kHz (-3 dB)
- Frequency response (phono): 20 Hz – 20 kHz (±0.3 dB)
- Video inputs: 3 (AV1/AV2 with dubbing, 10 Hz – 6 MHz)
- Power: 100 VAC, 170W
- Dimensions: 438 × 148 × 353 mm; 10.2 kg
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