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Onkyo Fine Bias Settings List

I am seeking the owner's manual content for an Onkyo cassette deck from the early 90's, model number TA-R301. There is an adjustable bias knob allowing settings of -5/+5 and I want to see how to correlate that with different brands of tape. I have been told that any list of Onkyo bias settings will probably be reasonably accurate...thanks! -Joe Smith, Des Moines