ANALOG TAPES — 1/2 15 IPS MRL Four Frequency NAB 250 nWb/m Calibration Tape

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1/2 30 IPS MRL Multi-Frequency (5 Frequency) Calibration Tape

Tape Guide, PDF, Equalization (Audio)

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1/2 15 IPS MRL 31J119 NAB 200 nwb Multi-Frequency Calibration

The journeys of a vintage audio geek (Netherlands)

RTM SM900 1/2 x 2500' Analog Recording Tape 10.5 Pancake Hub w

ANALOG TAPES — Home

1/2 15 IPS MRL Four Frequency 250 nWb/m NAB Calibration Tape

ANALOG TAPES — Home

ANALOG TAPES — Home

1/4 15 IPS MRL Multi-Frequency 250 nwb NAB (5 Frequency

MRL 1/4 15 IPS NAB 250 nWb Four Frequency Extended Calibration

HiFi Stereo Review 1984 Tape Recording Guide, PDF