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Open Reel To Reel - Magnetic Reference Labs Calibration Tape Brand NEW Calibration Tape recorded by MRL, which contain all the tones you need to set up reproduce equalization ("EQ") head alignment
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idk which test tape is right, would be any compatible with 3000hz such as my Sony TC-KE 400 S?. i wanna adjust the correct speed. : r/cassetteculture
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