Teac R-410
A model number that survives mainly in service-manual parts tables. That says something about how obscure this one is.
Overview
Almost nothing survives on the Teac R-410 in the way of advertising, reviews, or even a clean product photograph. What does survive is paperwork: service and parts documentation that names the R-410 directly and lists its board-level components - fixed carbon film resistors, electrolytic and mylar capacitors, and a handful of small-signal transistors. That's the entire documentary footprint for this one.
The parts tables are specific, though. In the service documentation, the R-410's resistors run from 100 Ω up through 680 kΩ. Common values like 1 kΩ, 10 kΩ, 15 kΩ, 47 kΩ, and 100 kΩ show up multiple times across the numbered positions (R108 through R818 in the tables). Capacitors include 10 mfd and 33 mfd electrolytics at 16 V, 47 mfd at 6.3 V, 100 mfd at 25 V, and mylar films at 0.01 mfd and 0.033 mfd at 50 V. Transistors listed in the R-410 documentation are the 2SC1327(T), 2SC1740LN(S), 2SC945LK, 2SA826LN(S), 2SD400(E), and 2SD655(E). None of that says what the unit sounded like. It does show a real production item with a documented bill of materials.
The R-410 prefix appears in Teac's parts numbering alongside R108, R208, R308, R408, R508, R608, R708, and R808. That's a repeating eight-position pattern, typical of multi-channel or multi-section boards. Whether it reflects a tuner, an amplifier stage, or something else isn't established by the surviving documentation, and the archive won't guess. If you're chasing an R-410, the service manual is the place to start.
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