Update February 2023

As my stock of BASF Reference II blank cassettes is depleted, the U04103-70N "Combination" alignment cassette replaces the U04103-70A. As before it is recorded full track however Maxell UDII-CD100 blanks are used. Each cassette contains longer sections for Level (400Hz), Azimuth (10kHz), Speed/W&F (3kHz) and can also be used for a 3-points playback frequency response check (400Hz, 3kHz, 10kHz).