Need help?Do you have a question about the Dual 721 and is the answer not in the manual?
Describes the electronically-controlled direct drive system.
Details the adjustable tracking force range and calibration.
Details tonearm construction, suspension, and dimensions.
Illustrates the main power supply and control circuitry of the unit.
Details the electronic circuit responsible for driving the motor.
Details how the electronic direct drive system controls motor rotation.
Explains the function of Hall generators in motor control.
Illustrates the functional blocks and data flow of the entire device.
Explains how phase windings are driven by transistors based on rotor position.
Illustrates the magnetic field dynamics influencing rotor movement.
Explains how induced tacho voltage controls motor speed.
Describes the tonearm's construction, suspension, and balancing procedures.
Details the process for adjusting the tonearm's horizontal and vertical bearings for optimal play.
Describes the function and adjustment of the anti-skating mechanism to counteract skating force.
To Next Page
General
