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As Phototone said, chromium dioxide (CrO2) tapes caused more wear on heads than regular (iron oxide) tapes. Later, high-performance tapes were developed that sounded equal to or better than CrO2 but were actually variations of iron oxide if I remember right. They were matched to the chromium dioxide bias and equalization settings of tape decks, though. TDK's SA and Maxell's UDXL were the early, popular tapes of this kind.
Later, the tape industry started using the designators "Type I" through "Type IV" for the different bias settings since not all "chrome bias" (Type II) tapes were actually CrO2 as mentioned above.
I have attached a picture of the first stereo tape deck model I bought new, a Superscope CD-304 in 1978.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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