Koetsu QUAD-63
Little is documented about the Koetsu QUAD-63 - so little that it can't be confirmed as a distinct product. The period material in the archive has no review, advertisement, or specification for a unit actually called "Koetsu QUAD-63." The two names do show up in the same classified pages, but separately: an Audio (September 1982, p.78) listing offered a pair of Quad ESL-63s at $2,800 and a Koetsu Black at $450. That could explain a cataloguing mix-up. It is not evidence that Koetsu made a QUAD-63.
The type, years, price, and specifications of a purported Koetsu QUAD-63 are undocumented in this archive's sources. If the model exists, it has left almost no trace.
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