Luxman SQ-38u (2009–2011)

Name: Luxman SQ-38U
Brand: Luxman

They don’t build ’em like this anymore—massive, all-tube, hand-finished, and alive with the glow of four EL34s.

Overview

The Luxman SQ-38u is a revival. The SQ-38 first appeared in 1963 and became a benchmark of Japanese tube design during the golden age of hi-fi. Decades later, after periods of brand dilution and outside ownership, Luxman's current president Kazuyuki Doi brought it back, not as a nostalgic replica but as the 11th installment in the line. Reinvented for 2009, the SQ-38u is the only 'arch vintage' styled component in Luxman's modern lineup.

The SQ-38u is a vacuum tube integrated amplifier. It pairs the warmth and body of classic tube sound with modern reliability and features. Luxman's goal was a mellow, warm sonic character with high performance, one that satisfies longtime tube enthusiasts and new listeners seeking a genuine high-end experience. It is not a solid-state amp in disguise. It uses four Sovtek EL34 output tubes and an all-tube preamp section. At 25kg, it feels like something from the 1950s or '60s - solid and dense.

Specifications

Manufacturer	Luxman
Model	SQ-38u
Production Years	First introduced in 1963. Reinvented for 2009. Updated versions produced until 2011.
Type	Vacuum Tube Integrated Amplifier
Power Output	25W + 25W (8Ω, 4Ω), 30Wpc into 6Ω
Circuit Type	EL34 push/pull, Ultralinear Mullard circuit, Class-A/B
Tube Complement	EL34 × 4, ECC83 × 4, ECC82 × 3
Phono Stage	2-stage PK-NF type MM/MC-hi/MC-lo with selectable gain and defeatable 30Hz rumble filter
Inputs	Five pairs of RCA inputs: Rec Out/Monitor; Pre-Out/Main-In jacks
Speaker Outputs	Two sets (A & B) of binding posts with A, B, A+B switching
Speaker Impedance	4Ω, 8Ω, 16Ω
Remote Control Functions	Volume up/down, mute
Dimensions (W×H×D)	440 × 200 × 340 mm
Weight	25kg
Frequency Response	20Hz - 50kHz
Total Harmonic Distortion	0.5%
Input Sensitivity (PHONO)	2.5mV
Input Sensitivity (TUNER, AUX, TAPE)	200mV
Output Level (TAPE REC)	200mV
Gain	14dB (line), 37dB (MM phono)
Power Supply Voltage	AC100V, 50Hz/60Hz
Power Consumption	220W
Chassis	Full 16mm MDF-with-wood-veneer casing
Front Panel	8 mm aluminum

Key Features

The Heart of the Machine: EL34s and Ultralinear Design

The output stage is a classic EL34 push/pull design in an Ultralinear Mullard configuration. Four Sovtek EL34 tubes deliver 25 watts per channel into 8 or 4 ohms, and 30 watts into 6 ohms. Operation is Class-A/B. Auto bias and cathode biasing help keep things stable and reduce the need for constant tube matching or adjustment.

All-Tube Preamplification and Phono Mastery

The preamp uses seven small-signal tubes (four ECC83 and three ECC82) for gain and signal routing, so the entire path stays vacuum-tube based. The phono stage is a 2-stage PK-NF type circuit with selectable inputs for MM, MC high output (40 ohm), and MC low output (2.5 ohm). A built-in step-up transformer handles MC duties. A defeatable 30Hz rumble filter cleans up warped records without dulling the bass. Reviewers have called the phono stage “killer,” noting that playback sounds “yummy” and “alive,” especially with delicate acoustic recordings.

Thoughtful Switching and System Integration

Input switching is done by nitrogen-encapsulated relays, chosen for longevity and clean contact. That avoids the crackle and wear of mechanical switches over time. A dedicated front-panel switch separates the preamplifier section from the power amp, so the unit can work as a standalone preamp with external amplification. The pre-out/main-in loop is also front-panel switched, which removes the need for internal jumpers and preserves signal integrity. There are five RCA input pairs, and the rec/monitor loop allows tape dubbing or source verification.

Headphone Amplification Done Right

The headphone output skips the separate solid-state buffer. Luxman uses the actual tube output stage, padded down with a single resistor. Reviewers describe the result as “far and away the best I've heard from an integrated amp,” and one noted it rivals their $1,050 Woo Audio WA-6SE tube headphone amplifier.

Build Quality That Speaks Volumes

The chassis is a full 16mm MDF-with-wood-veneer casing, wrapped in a square-shaped wooden body. The front panel is machined from 8mm aluminum. The Luxman signature yellow power LED ring, carried over from the original 38 Series, adds a touch of vintage flair. Gold-plated tube sockets ensure reliable contact, and the fit and finish remind owners of the best gear from the 1950s and '60s. One reviewer put it plainly: “It feels heavy, heavier than most golden-age tube integrated amps, and much better put-together.”

Historical Context

The SQ-38u exists because Luxman needed to reclaim its identity. After years of brand dilution and outside ownership, the company went back to one of its most legendary designs. The original SQ-38 debuted in 1963, followed by the SQ-38D in 1965. Over the decades, the design went through 11 iterations. The 2009 SQ-38u was more than a reissue. It showed that Luxman still believed in hand-finished, high-performance tube amplifiers in an age of digital receivers and streaming boxes. It carries the “38” name, Luxman's golden number, and is listed as a “Legendary Product” in the company's catalog.

Collectibility & Value

Production ended around 2011, and the SQ-38u has a strong following among tube enthusiasts and Luxman collectors. Its vintage aesthetics, modern reliability, and exceptional sound have driven steady demand. Recent listings show prices ranging from $2,999 to €2,800 (Kleinanzeigen, 2025), with regional variations including CA$3,400 and PLN 14,500 (OLX Poland). A unit listed for ¥1,000 on Yahoo Auctions in 2022 appears to be an outlier, possibly damaged or incomplete. Given its sturdy construction and lack of common failure points, well-maintained examples are expected to remain functional and desirable for years. No widespread reliability issues or maintenance concerns have been documented, though as with any tube amp, periodic tube replacement and cleaning of controls are recommended.