Luxman SQ-38D (1998)
A limited-edition reissue of a classic tube amplifier, updated for modern use with EL84 output tubes and extra inputs.
Overview
The Luxman SQ-38D is a reprinted version of a vintage tube integrated amplifier, released in November 1998 as a tribute to Luxman's classic SQ-38 series from the 1960s. This model updates the original design with modern compatibility in mind, including increased output power and an additional fifth line input. It uses vacuum tube circuitry throughout, including dedicated tube stages for the phono amplifier and tone control. Only 500 units were produced, making it a sought-after piece among collectors of Japanese high-fidelity gear.
Specifications
| Rated output | 12W + 12W (1 kHz, 8 Ω) |
| Input sensitivity Aux | 220mV |
| Input sensitivity Monitor | 440mV |
| Input sensitivity Phono1 | 0.15mV |
| Input sensitivity Phono2 | 4mV |
| Total harmonic distortion factor | 0.2% (1 kHz, 1W) |
| Tone control Bass | ± 8 dB (100 Hz) |
| Tone control Treble | ± 8 dB (10 kHz) |
| Signal-to-noise ratio Phono1/2 | 60dB |
| Signal-to-noise ratio Aux | 62dB |
| Equalizer | RIAA |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 90W |
| External dimensions | Width 470 x Height 175 x Depth 275 mm |
| Weight | 15.0kg |
Design
The SQ-38D uses an OY-type output transformer originally developed in 1964, leveraging over 30 years of Luxman’s transformer expertise. The amplifier features a vacuum tube signal path with 12AU7 tubes in the first and driver stages, and 6BQ5 (EL84) tubes in the output stage. The tone control circuit is built around a 12AX7 vacuum tube, and the phono amplifier is fully tube-based. A transformer-based MC booster circuit supports moving coil cartridges.
Context
This reprinted SQ-38D revives a representative model from Luxman’s long-running SQ-38 series, which began in the 1960s. While the original 1964 version used 6RA8 tubes to deliver 10W + 10W, the 1998 reprint updates the design with 6BQ5/EL84 tubes for higher output (12W + 12W) and better compatibility with modern speakers and sources. The reprint retains the original’s core design philosophy while adding a fifth line input for contemporary use.
Market
Released in a limited run of 500 units, the SQ-38D reprint is collectible and has been listed at prices up to $4,100. The original 1964 SQ-38 is considered rarer and more valuable.
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