Luxman MQ-300
The Luxman MQ-300 is a single-ended stereo power amplifier built around a pair of Takatsuki TA-300B directly heated triodes. These are the Japanese-made counterpart to the Western Electric 300B. Luxman released it to mark the company's 90th anniversary. The design follows the company's MB-300 monoblocks from 1984, down to the walnut-framed chassis with the transformers and tubes exposed on the top panel. The MQ-300 is a stereo amplifier, though, where the MB-300 was a monoblock.
Output is rated at 8W + 8W, which is typical for a single-ended 300B design. The tube complement is big: two TA-300B output tubes, two 5AR4 rectifiers, and four 6SN7GTB drivers. The chassis is built to be unusually rigid - a 1.6mm steel chassis, 2mm bottom plate, and 12mm top panel - to control vibration around those sensitive tubes. The whole thing weighs 29 kg.
Period coverage is thin, but what exists is favorable. Hi-Fi News described the MQ-300 as instantly imposing, praising its flawless finish, top-quality tubes, and superior terminals. Several retail listings also show it as "sold out."
No production years, frequency response, THD, or impedance figures are documented in the sources available to us. What's clear is the intent: a focused, anniversary-grade 300B amplifier that nods to Luxman's tube past without pretending to be a period piece.
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