• Which Calibration Tape Should I Buy? An Elementary Guide should help those who are new to analog magnetic tape recording to find the right Calibration Tape for their needs.
• Choosing and Using MRL Calibration Tapes, a 12-page technical paper, gives a more advanced discussion of general information that applies to all of our calibration tapes. Topics covered include a guide to choosing a Calibration Tape (standards, test signals available, levels, reference fluxivity, and fringing), tape reproducer adjusting techniques (preliminaries, low-frequency response calibration, what to do in case you don't have the right calibration tape), some tape recorder adjusting techniques, and our specifications and tolerances.
• Our Explanation of the MRL Catalog Numbers will help convert your specs to an MRL part number. The Catalog page and associated filters should obviate this document, but we retain it for those that really want to get into the details.
• Complete List of MRL Publications gives all the other test signals that we can record for you, including Polarity Calibration, special signals for Sound Technology or for Audio Precision measurement systems, Fast Swept-frequency for use with an oscilloscope, Slow Swept-frequency for use with a plotter, single frequencies, Broadband Pink Noise, Broadband White Noise, and Chromatic Sweep for use on your reproducer's vu meter.
• All of our Calibration Tapes are recorded full-track, and so may be used for calibrating reproducers of any track format.
• We only stock a few of the more popular types of Calibration Tapes, but can usually make anything not in stock 2-4 weeks after receiving an order.
• We no longer make calibration tapes in the broadcast cartridge format because lube tape and cart shells are no longer readily available.
• We do not now make, nor have ever made, calibration tapes in the compact cassette format. In the past, BASF/Emtec, TEAC, and STL (Standard Tape Laboratory) made such products, and used versions may still be available online, and from dealers such as JRF Magnetics.
• Please consult our many other technical papers on magnetic recording for more detailed information.

Here are some examples of the catalog pages describing Calibration Tapes with the more popular test signals:

• Multifrequency (general purpose, for setting reproducer gain, azimuth, and frequency response from 32 Hz to 20 kHz).
• Two frequencies (1 kHz, 10 kHz).
• Three frequencies (1 kHz, 10 kHz, 50 Hz).
• Four frequencies (1 kHz, 10 kHz, 16 kHz, 50 Hz).
• Two-speeds, with many different selections of frequencies.
• Flutter and Speed Test.