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Hi, I need to get in touch with people who have used TDK audio cassettes, models SASAX, MAX or ARX, for recording before December 1988. Any help would be appreciated. Thanks. Margaret Jones Reference Librarian Stroock & Stroock & Lavan 180 Maiden Lane New York, N.Y. 10138 - For subscription instructions, see the ARSC home pag Copyright of individual posting is owned by the author of the posting and permission to re-transmit or publish a post must be secured from the author of the post.

At about the same time, chromium dioxide (CrO2) was introduced by DuPont, the inventor of the particle, and BASF, the inventor of magnetic recording,[28] and then coatings using magnetite (Fe3O4) such as TDK's Audua were produced in an attempt to approach the sound quality of vinyl records. Cobalt-absorbed iron oxide (Avilyn) was introduced by TDK in 1974 and proved very successful. Finally, pure metal particles (as opposed to oxide formulations) were introduced in 1979 by 3M under the trade name Metafine. The tape coating on most Cassettes sold today as either Normal or Chrome consists of ferric oxide and cobalt mixed in varying ratios (and using various processes); there are very few cassettes on the market that use a pure (CrO2) coating.[2]

TDK : Standard Size Audio Cassette, Normal Bias, 90 Minutes (45 x 2) This standard size audio cassette is capable of dubbing, archiving vinyl, recording radio talk shows or capturing almost any audio source. Normal bias for universal recording. Utilizes ultra-fine, high-sensitivity Super Finavinx metal magnetic particles to realize superlative audio fidelity and produce high quality. Global Product Type: Cassettes-Audio; Cassette Type: Audio; Cassette Size: Standard; Grade/Quality: Normal Bias.:Manufactured

TDK Standard Size Audio Cassette, Normal Bias, 90 Minutes (45 x 2) This standard size audio cassette is capable of dubbing, archiving vinyl, recording radio talk shows or capturing almost any audio source. Normal bias for universal recording. Utilizes ultra-fine, high-sensitivity Super Finavinx metal magnetic particles to realize superlative audio fidelity and produce high quality. Global Product Type: Cassettes-Audio; Cassette Type: Audio; Cassette Size: Standard; Grade/Quality: Normal Bias. SKU: TDK20100