TDK MA-R C-90
Documentation on the TDK MA-R C-90 is thin. No manual or factory spec sheet is in the archive. The record that does exist comes from the early-1980s dealer press. An Audio ad (August 1981, p.78) listed the Mar-C90 at $11.99. HiFI-Stereo (1982, p.142) carried it at $15.99 and described the “MA” (Metal Alloy) blank’s back-treated tape as made for smooth running and stable winding. The same listing priced the MA-R C60 sibling at $11.89.
Beyond those period listings, little else is documented about this cassette.
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