@inna not sure I go along with you 100% on your detective work. The reason I say that is tape is a magnetic medium inasmuch as the tape stores information magnetically, not electromagnetically. And the tape head reads the information on the tape magnetically, not electromagnetically. Obviously somewhere along the line the information is converted to an electromagnetic signal for output to headphones or speakers, like any other medium. Digital is optical to electromagnetic signal. Vinyl is mechanical/magnetic to electromagnetic signal.