Philips AF 829 turntable

Philips model AF829 turntable is front operated, direct control, and fully automated. Direct control is a new system combining the advantages of measuring the actual speed at the turntable and the well-known advantages of belt drive, in combination with the subchassis  principle used in earlier Philips turntables. The major achievement, according tp Philips, is that it brings the specifications to the level of direct drive, but without the inherent problems of direct drive which requires extremely fine construction to avoid rumble, suppress microphony, and decrease sensitivity to shocks. Direct control begins rotating the motor at 33 or 45 RPM, as selected. The belt transfers the rotation to the turntable. The speed of the turntable is continuously sensed by the tacho-generator and converted into a voltage, the output of which is fed into the control unit where this voltage is compared to a reference voltage. The resulting difference voltage is used as a control signal to adjust motor speed. Thus in this system all extrnal influences are compensated, including changes in tracking force, different record weights, use of a dust bug, changes in environmental temperatures and relative humidity, mains voltage, and frequency fluctuations. 

features:

free-floating sub-chassis

low torsion tone-arms

tachometer

speed regulation

CMOS memories

Specifications

System:  Direct Control

Operations:  Full-automatc

Speeds:  3-1/3 and 45 rpm

Turntable Diameter:  310 mm

Wow and Flutter : less than 0,025 (WRMS)

Rumble:  less than 73 dB (DIN B)

Tonearm Type:  Linear

Tonearm length:  215 mm

Tracking Error:  less than 0°9' /cm

Dimensions (W x H x D):  450 x 141 x 365 mm