TDK C-90 (Unknown years)
The record for a plain “TDK C-90” is thin. The supplied documentation has no spec sheet, no design notes, and no review for a standalone model by that exact name. It does have period advertisements for TDK’s SA C-90 and AD C-90 cassettes in the audio blank-tape market. A December 1981 ad in High Fidelity (December 1981, p.143) shows SA C-90 at $2.99. An earlier High Fidelity ad (October 1980, p.126) lists both SA C-90 and AD C-90, at $2.99 and $1.39 respectively.
Beyond those prices, no production years, factory specifications, or editorial assessments are documented here. It may be that “C-90” was just the length suffix carried by several TDK formulations, and not a distinct model of its own - but that would need a spec sheet or catalog page to verify.
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