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A Solid State Amplifier with Current Generator Drive for Magnetic Tape Heads

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Solid-state record amplifiers presently available for magnetic tape heads drive the head with a voltage generator and, accordingly, require involved passive equalization circuitry to achieve a flat frequency response. This paper describes a technique whereby the head is driven directly by a current generator and equalization is accomplished actively within a feedback loop. Two potentiometer settings will yield a frequency response of +/-1 db, 20 to 20,000 cps at 7-1/2 ips using NAB standards.

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AES - Audio Engineering Society