Luxman T-310 (1973–1975)

The export-only tuner that brought Dolby B to FM—where high fidelity met noise reduction in a rare, meticulously engineered package.

Overview

You don’t stumble on a Luxman T-310 by accident. This isn’t the tuner your uncle left in the basement next to a stack of dusty records. It’s a deliberate artifact—an export-only AM/FM stereo tuner from the mid-70s, built for markets outside Japan, and one of the few consumer receivers ever equipped with Dolby B noise reduction for FM broadcasts. That alone makes it a curiosity, but what elevates the T-310 from novelty to legend is its engineering: a 4-gang FM front end with dual-gate MOS-FETs, phase-locked-loop decoding, and a build quality that whispers “this was made to last.” Released between 1973 and 1975, the T-310 wasn’t just another box in the rack—it was Luxman’s statement that even the tuner, often the weakest link in a system, deserved precision and care.

And then there’s the Dolby FM. In an era when tape hiss was the enemy and high-end listeners were chasing silence between the notes, the T-310 offered something radical: the ability to decode Dolby B-encoded FM broadcasts. It never caught on widely—few stations used it—but for a brief window, this tuner let you hear radio with a signal-to-noise ratio of 80 dB in mono, 74 dB in stereo. That’s not just good for 1975. That’s good, period. It also meant you could loop in a tape deck and use the same Dolby circuit to clean up cassette playback, making it a dual-purpose noise-reduction hub. If you were building a reference system in Europe or North America during the mid-70s, the T-310 was a quiet flex—a tuner that did more than tune.

Specifications

Key Features

4-Gang FM Tuning with MOS-FET Front End

The T-310 uses a 4-gang variable capacitor for FM front-end tuning, a design choice that improves tracking accuracy across the band. Paired with dual-gate MOS-FETs in the RF stage, this setup delivers exceptional sensitivity and low noise—critical for pulling in weak signals without amplifying hiss. It’s a hallmark of high-end tuner design from this era, and Luxman executed it with their usual precision.

Five-Pole Phase Linear and Linear Delay Filters

Between three ICs and the IF amplifier, the T-310 employs five-pole Phase Linear and Linear Delay filters. These aren’t just buzzwords—they’re part of what gives the tuner its tight selectivity and clean stereo decoding. By shaping the IF response with such precision, Luxman minimized crosstalk and improved channel separation, contributing directly to the 40 dB stereo separation at 1 kHz.

Hermetically Sealed Coils and FET Audio Gates

Temperature stability matters in analog circuits, especially in the MPX (multiplex) decoder where timing is everything. The T-310 uses hermetically sealed coils in this section to prevent drift, ensuring consistent stereo decoding over time and temperature swings. FETs control the audio gates, offering fast, low-distortion switching that preserves signal integrity.

Three-Stage AM IF with Switchable Filters

The AM section is no afterthought. It’s a 3-gang design with three IF stages and 18 dB/octave switchable filters, plus voltage regulators for clean power delivery. This allows for better adjacent-channel rejection and cleaner reception on crowded bands, backed by an 85 dB IF rejection spec.

Phase-Locked-Loop Multiplex Decoder

Instead of a traditional Foster-Seeley discriminator, the T-310 uses a phase-locked-loop (PLL) multiplex decoder. This design offers superior stereo separation and lower distortion, especially under weak signal conditions. It’s one of the reasons the tuner maintains a 0.3% THD even in stereo mode.

Dolby B Circuit with Calibration

The defining feature: a full Dolby B noise reduction system for FM. It includes calibration (CAL) detectors and meter adjustments, allowing users to align the decoder for optimal performance. This wasn’t just tacked on—it was integrated with the same care as the rest of the circuitry, capable of reducing noise by up to 10 dB on compatible broadcasts.

Tape Loop, 4CH Output, and Dual Multipath Outputs

The T-310 doesn’t just receive—it routes. It includes a tape loop for recording, a 4CH output (likely for quadraphonic systems, though not decoded internally), and two multipath outputs. These latter jacks let you monitor multipath distortion, a clever diagnostic tool for optimizing antenna placement in real time.

Historical Context

The T-310 was the last sibling in a lineage that included the WL500, WL550, and T-550—models released between 1970 and 1973. Positioned as a complement to Luxman’s L-308 or L-309 preamps, it filled a niche for high-end system builders who demanded more from their tuner than basic reception. Its export-only status meant it never appeared in Japanese catalogs, likely due to limited domestic demand for Dolby FM. The T-300, its closest sibling, was functionally identical except for the absence of the Dolby FM circuit and related switches—making the T-310 the sole model in the series with this feature. Originally priced at 1,798 Deutsche Mark, it was a premium product from the start, aimed at European and North American audiophiles who valued both innovation and build quality.

eBay Listings

Luxman Model T-310U Stereo Tuner - Tested

$250

Luxman T-310 AM/FM Stereo Tuner Service Manual Original Genu

$39.99

LUXMAN R-115 STEREO RECEIVER

$250

LUXMAN R-1070 STEREO RECEIVER

$1,000

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