Analogue Media Technologies Pty Ltd :: Miscellaneous :: Test Tapes :: Audio Cassette Volume Calibration Tape
GennLab Pioneer Calibration Cassettes
London Vintage HiFi Market - Calibration Cassette Speed Playback Professional Test Tape 3000 Hz (3 kHz) frequency Type II Clear Chrome for Stereo Cassette Deck, Walkman, Answering Machine, Boombox, Cassette Player -
Marantz Calibration Tape | Stereo2Go forums
Audio Cassette Speed Calibration Test Tape 3150 HZ - Test Tapes - Audio Cassettes - Duplication.ca