Luxman C-405
A Luxman component that survives in the service documentation more completely than it does in the collector's memory.
Overview
Some Luxman pieces get their reputation from the spec sheet - a power rating, a damping factor, a phono stage that embarrassed the competition. The C-405 is not that kind of document. What survives of it is a parts list: page after page of capacitor values, voltage tolerances and dielectric types. It is the plain skeleton of a component that someone at Luxman's engineering department once signed off on and that a service technician somewhere still consults.
The manufacturer's parts documentation attributed to this model reads like a tour of late-twentieth-century Japanese passive-component practice. The electrolytic section shows how the unit was built. 47µF +50% −10% 16V parts sit next to 100µF +50% −10% 25V types, with the wide asymmetric tolerances typical of general-purpose electrolytics of the era. Where the circuit needed stability rather than bulk, the documentation calls for polystyrol - 470PF ±5% 50V, 450PF ±5% 50V, 3300PF ±5% 50V. That is a tight-tolerance, temperature-stable dielectric that Luxman leaned on heavily in this period. Mylar appears throughout the signal path in values like 0.033µF ±10% 50V and 0.039µF ±10% 50V. Tantalum covers the small-value spots at 2.2µF ±10% 35V and 10µF ±10% 10V.
That mix follows the standard hierarchy of the period. Ceramic goes where the value is small and the job is undemanding - 0.04µF +80% −20% 25V appears repeatedly, sometimes a dozen times on the same board. Polystyrol goes where the tolerance matters, and electrolytics go where capacitance per unit volume wins. Collectors who have worked inside Luxman gear of this generation will recognize the pattern. It is not exotic. It is competent, and the documentation preserves it in unusual detail.
That documentation is most of what can be said with confidence. No period review of the C-405 has surfaced in the archive's holdings, and no independent measurement data is available. The one magazine chunk associated with the model, a HiFI-Stereo (February 1996, p.145) page, turns out to be a dealer advertisement for a Harman/Kardon AVR-20, not coverage of the Luxman at all. Anyone citing that page as a C-405 review is citing a misattribution. The C-405's contemporary reception is undocumented in the sources available here.
The parts list does carry one small piece of design evidence. The documentation's miscellaneous section lists a pair of tubes - 6CG7 and 6CG7GE, part numbers 65T00091L01 and 65T00091L03 - alongside a headphone jack, a power transformer and output transformers. Whether those tubes belong to the C-405 itself or to an adjacent chassis covered in the same service document is not something the available sources settle cleanly. Luxman did build tube and hybrid designs in this era, so a tube complement is not implausible, but the archive will not assert it as fact. Treat any claim that the C-405 is a tube component as unverified until a titled schematic or owner's manual surfaces.
The C-405 exists in Luxman's service literature with enough granularity that restoration is possible. Its capacitor values, tolerances and dielectric types are all documented, so a technician can bring it back. Recapping becomes a matter of matching polystyrol to polystyrol and mylar to mylar rather than guessing.
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