1/4 15 IPS MRL Four Frequency Calibration Tape

The tape is 1/4 on a 7 plastic reel. The tape is 4 minutes long, with 1 minute for each frequency. The four frequencies of the tape are: 1 kHz, 10

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2 MAGNETIC REFERENCE Laboratory MRL Reproducer Alignment Calibration Test Tape $249.00 - PicClick

1/2 15 IPS MRL Four Frequency NAB (+6) 355 nWb/m Custom Calibration Tape

Two calibration tapes (one for level, one for frequency) for 1/4 master tape machines., 15 ips, 320 nWb/m, 15 ips, IEC, Made by Pievox in Germany.,

Pievox Calibration tapes 1/4 inch

Burlington Recording/ CFK HXC60 TYPE 1 60 Minute Standard Music Grade Audio Cassette (10 Pack)

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Used only a handful of times. 1/4”-7.5 i.p.s. NAB equalization

MRL Reproducer Calibration Tape 2016 1/4”-7.5 ips

1 7.5 IPS NAB 355 nwb (+6) MRL Four Calibration Tape

Variations on a Theme of 1/4-Inch Tape – PS Audio