Magnetic Reference Laboratory Reproducer Calibration Tape, model 21T204. Professional calibration program for decks running 7.5 in/s (190 mm/s) with NAB equalization (IEC1). Reference fluxivity 250 nWb/m. Multifrequency program at 0 dB and –10 dB: 1 kHz reference at 0 dB, azimuth tone at –10 dB, and frequency-response tones.

Program Content
• Multifrequency program at 0 dB & –10 dB
• 1 kHz reference (0 dB)
• Azimuth tone (–10 dB)
• Frequency-response tones (0 dB)
• Tape width 0.25 in (6.3 mm), total program ~5.5 minutes

Condition
Tape: Like new; clean, properly wound.
Reel: Original 1/4″ reel in excellent condition.
Box: No shelf wear noted (see photos).
Labels/Spine: Model, speed, EQ, and fluxivity fully legible.

Details
Brand: Magnetic Reference Laboratory (MRL)
Model: 21T204
Speed: 7.5 IPS (190 mm/s)
Equalization: NAB (IEC1)
Ref Fluxivity: 250 nWb/m
Width: 1/4″ (6.3 mm)
Program Length: ~5.5 minutes
Serial/Lot: SN 139 221, M2014-05
Orientation: [as supplied; rewind per your deck’s practice]

Notes
Ideal for setting repro level, azimuth, and checking frequency response on NAB-EQ machines at 7.5 IPS. Not suitable for CCIR/AES (IEC2) playback decks—match the EQ to your machine.