What does discrete head mean?
The erase, record, and playback heads are all individual components. The result is better recording and playback as each head is dedicated to its specific job as compare to a 2 head which uses a common record/playback head whose function is determined by a switch or relay. Most three head machines allow for immediate monitoring or recorded signal with the exception of the 481, 581, and 681ZX. These machines have the sonic fidelity of a three head without the convenience or cost.