Re: How to set the speed on cassette decks.
In the absence of a known good recorded tape you can get some idea by checking the run time of a C60 or C90 cassette in reasonable condition - of course this is not 100% accurate as different manufacturers will put on different length leaders and add a few feet to be on the safe side but it will give you an idea.
If you can get access to an accurate recorded tone tape you can check the frequency and record an exact copy for future reference.
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