Turntable Details
Drive
Belt
Motor
AC
Wow & Flutter %
Rumble [dB]
Speed
33, 45
Dimensions [mm]
Platter Material
Platter Diameter [mm]
Total Weight [kg]
Tonearm
Year Built
10.50
Straight
Platter Weight [kg]
Plinth Material
Price
Additional information
Speed Control
An optical encoder is fitted to the underside of the platter - its counterpart is a laser emitter/optical sensor fixed to the subchassis with the control firmware is built into the electronics contained within the left hand pillar. Speed is referenced to the record and not the absolute motor speed (as is conventional )
Radial (platter) velocity is evaluated/corrected in real time at 200Hz. {(33.333/60) x 360 encoder divisions)
For this reason, the Viridia is not affected by temperature variations; though the platter may expand or contract according to environmental conditions, this design ensures the turntable always functions at the correct speed.
Platter
2.825Kg - Though low mass compared to some, the point of the closed-loop speed correction is that the platter inertia cannot be so high as to prevent real-time correction. If it is, the motor will not have the torque needed to correct speed deviation in real-time.
Thrust bearing
Bearing shaft - 16mm diameter, through-hardened and tempered. Hardness 600 - 700 HV1.
Platter is suspended magnetically using neodymium magnets with a repulsive force of 4.8kg.
As there is no physical contact between the platter and subchassis, rumble is not a relevant measurement.
Additional features
Record clamping weight
Tapped holes to clamp tonearm cables
Platter mat made to match the acoustic impedance of the LP vinyl.
Motor has its own suspension
Motor mounted on floating subchassis so belt tension remains constant regardless of subchassis suspension movement.
Damped composite subchassis