| 摘要 |
A tape recorder having a tape speed changing mechanism comprises a magnetic recording and reproducing head, an oscillation circuit connected to the head, an equalizing circuit connected to the oscillation circuit, means for changing an AC bias in response to a tape speed in accordance with a reference voltage which is switched by a speed changing switch of a motor and means for changing a circuit constant of the equalization circuit by a switch which is interlocked with the speed changing switch.
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