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Luxman M-2000 (1975–1979)

Eighteen kilograms, two glowing VU meters, and a parallel push-pull output stage that Luxman built by the tens of thousands. It's the flagship power amp you can still actually find.

Overview

Eighteen kilograms tells you what kind of amplifier this is before you lift it. The Luxman M-2000 is a stereo power amplifier built from 1975 to 1979, and it sat at the top of Luxman's power-amp range when it was introduced. The sources argue a little about the introduction date - audio-database.com says December 1975, thevintageknob.org says October 1975 - but nobody disputes the intent. This was the flagship, priced at ¥225,000 in Japan and listed in the Audiogon Bluebook at a $995.00 retail. It was announced as a sister unit of the M-4000 and rounded out what thevintageknob.org calls the "anniversary lineup," arriving third after the M-6000 and the M-4000.

The headline figure is 120 watts per channel into 8 ohms, both channels driven, across the full 20 Hz to 20 kHz band. audio-database.com, hifiengine.com, reverb.com and qaudio.com all quote that figure. thevintageknob.org lists 2×180W instead, and that number has never reconciled with the rest of the spec sheet. Collectors have argued about it for years. The clean read is that 120W is the rated continuous output and 180W is either a different measurement condition or a transcription error. (classic-audio.com separately lists 180 + 180W into 4Ω, which is a plausible load-dependent figure, but it's the only source that gives it.) Distortion is split too: audio-database.com claims 0.02% or less at rated output, while other listings say 0.05%. Either way it was a very clean amplifier by mid-1970s standards. The 5 Hz to 100 kHz ±1 dB frequency response is genuinely wide, and that kind of bandwidth only comes from a circuit with real gain and stability margins.

No single heroic number makes the M-2000 worth writing about. It's the architecture, and the fact that Luxman sold so many of them that they're still easy to find. hifi4sale.net notes the amp "sold very well worldwide so it isn't rare," and thevintageknob.org's assessment is that for once, an amp is as easy to find as it is beautiful, good-sounding and reliable. It has a flagship topology, a mid-size 485 × 175 × 295 mm chassis, and a healthy worldwide production run. That's why the M-2000 remains one of the more accessible entries into Luxman's golden-era power amps.

Key Features

Parallel Push-Pull OCL Output with Four Power Transistors per Channel

Each channel has four high-output devices arranged in parallel push-pull inside a pure complementary all-stage direct-connection OCL topology. That is what lets the M-2000 deliver its rated 120W with margin to spare. The parallel arrangement increases the instantaneous collector dissipation available in proportion to the number of devices, which is the headroom you want when a speaker's impedance dips. It also lets each transistor be biased into the more linear portion of its hfe-Ic curve, which is where the low distortion numbers come from. The service-manual language is blunt about the intent: sufficient driving of various types of speaker systems. A damping factor of 100 into 8 ohms backs that up. It's not spectacular by later standards, but it's solid for 1975.

Class A Pre-Driver Isolated by an Emitter Follower

An emitter follower bridges the Class A voltage-gain stage and the Class B output stage, and audio-database.com is explicit about why it's there: to prevent the distortion characteristic from deteriorating when the speaker load's impedance swings. Without it, a reactive speaker load reflects back into the pre-driver and modulates its operating point. With it, the two halves of the amplifier stay electrically isolated and each runs in its own sweet spot. Constant-current circuits sit at the important nodes, and the pre-drive stage uses transistors selected for high fT and low Cob. This kind of engineering doesn't show up on a spec sheet, but it does show up when you connect a difficult speaker.

Fully Regulated Pre-Driver Power Supply and Dual-Mono Output Supply

The output stage runs off a supply with separate circuits for the left and right channels, built around a large central transformer and a pair of 10,000 µF electrolytics in a ±2 configuration. (One research-page claim of dual 22,000 µF caps per channel conflicts with the manufacturer documentation and should be treated with suspicion.) The pre-driver stage gets a fully constant-voltage supply, a real automatic voltage regulator and not a passive filter. The point is to keep the low-level circuitry immune to AC mains sag and to the current swings the output stage draws on musical peaks.

Dual VU Meters with Six Red LED Peak Indicators Each

The two large center-mounted meters are the visual signature of the M-2000, and collectors still cite them as a highlight of the era's Luxman industrial design. They're average-reading VU meters, but each is paired with six red LEDs that catch instantaneous peaks. The peak LEDs can be switched to a ×10 scale or turned off entirely. The meter sensitivity is switchable between 0 dB and −10 dB, with an output-display OFF position. The meters read the output level, and the LED array reads what the meters miss. It's a compromise between the ballistics of a moving-coil movement and the speed of a peak detector.

1 dB-Step Precision Detent Input Level Controls

Each channel has its own input level control, a 22-point detented attenuator stepping in 1 dB increments. It's the same grade of part you'd find in a high-quality outboard attenuator. This lets the owner match the M-2000's input sensitivity to whatever preamp is feeding it, using the optimal range of both. Input sensitivity is specified at 800 mV into 50 kΩ, and the gold-plated RCA jacks on the back handle the connection. A speaker-impedance switch selects 4Ω or 8Ω loads.

Double Protection Circuitry

There are two separate protection systems, and the service manual is unusually candid about why. The over-current detector electronically restrains current to keep the output transistors inside their Safe Operation Area when a fault appears, and if the restraint persists past a set time, fuses blow. The DC drift detector cuts the speaker output if it senses roughly ±3V DC at the terminals. It also works as the muting circuit at power-on, protecting the speakers from the transient thump. A lamp on the front panel indicates protection-circuit operation. The manual's framing is plain: the OCL topology delivers the signal most faithfully, but it also delivers any amplifier fault straight to the speaker.

Historical Context

The M-2000 was announced as a sister unit of the M-4000 and arrived as the last of the three anniversary-lineup power amplifiers, after the M-6000 and the M-4000. It was the flagship stereo power amp of its introduction, positioned at the top of Luxman's range. The export version sold in North America and Europe. thevintageknob.org notes the Japan-market version had a different front panel, and Japanese-market listings specify 100 VAC input. Production ran to 1979 according to hifi-wiki.de, though thevintageknob.org stops at 1978, so treat the end date as roughly 1978-79.

A 1976 High Fidelity advertisement (February 1976, p.19) laid out Lux's quality-control practice of certifying that every amplifier or tuner meets or exceeds its published specifications before shipping. That's a general brand claim rather than an M-2000-specific one. Audio (December 1975, p.29) ran the same certification message for Lux's amplifier and tuner line. A single marketplace listing credits engineer Tim de Paravicini with involvement in the design. That claim appears nowhere in the technical documentation and should be treated as unverified.

Collectibility & Value

Because so many were made, the M-2000 is one of the more accessible entries into Luxman's golden-era power amps. Typical 2024 asking prices ran $1,200 - $1,800 USD for clean, refurbished units with original boxes. Working units with cosmetic meter issues changed hands for around $800. The Audiogon Bluebook lists a $995.00 retail price, though the currency and year context aren't stated. The meters are the usual cosmetic weak point. The LED backlight dims or dies, and original replacements are essentially unobtainable, though third-party LED lamp sets have been listed on eBay for around $34.50. Those replacements are DC types with 180-ohm resistors, modified from the original AC dual-die design, so they aren't a drop-in match. Buyer feedback on one set described the soldering as merely average.

The protection relay is the other common failure, and replacement relays do surface on the secondary market. The original Sanken output transistors are obsolete and require matched substitutes if one lets go. Recapping the power-supply electrolytics is recommended after roughly two decades, and the practical advice from the repair community is to replace all the electrolytics with modern low-ESR parts while the chassis is open. Capacitor rebuild kits for the M-2000 have been offered on eBay, and the service manual exists as a roughly ten-page PDF from several sources. Owners remain enthusiastic. One called it an undervalued classic, and another claimed it out-musicalizes a Krell KSA-100.

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VINTAGE TECHNOLOGY ARCHIVE / 10-19-2026 / FEEDBACK