TDK AD C-90
Little is documented about the TDK AD C-90. What survives is mostly retail advertising copy, not editorial coverage or manufacturer literature.
The clearest period appearance is in a High Fidelity (October 1980, p.126) advertisement column. The "AD C90 (New)" is listed there at $1.39, among other blank tapes, including the TDK SA C90 at $2.99 and the Ampex Grandmaster series. That puts it in the audio-tape market. The model name suggests a ninety-minute blank cassette, but the archive holds no specification sheet confirming the formulation, shell construction, or production years.
Known from the period record:
- Advertised as "new" in a High Fidelity retail listing, October 1980, at $1.39.
- Appearing alongside other C-90 blank tapes in the same listing, suggesting a standard-length consumer audio cassette.
Beyond that, the AD C-90's tape type, packaging, and market history are undocumented here. A period review, an insert, or a catalog page for this exact model would fill in the entry.
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