Motor and Pulley
Power for the turntable platter and the changing mechanism is supplied by a four—pole Dual continuous pole synchronous motor suspended by radially located elastic mounts and having a very small stray magnetic field and little vibration. The speed of the motor is independent of line voltage, temperature or load variations. Speed is dependent on, and proportional to power—line frequency. The motor is adapted to 50 or 60 cycle (Hz) power—line frequencies by the correct choice of motor pulley.
The motor pulley is fastened to the motor shaft by a setscrew. When you change pulleys, be sure that the new pulley is set at the correct height The turntable platter is driven by the idler wheel, which, to prevent damage to its friction surfaces, is automatically disengaged when the unit is shut off. Setting the turntable speed to 33 1/3, 45 or 78 rpm is done by raising or lowering the idler to bear against the proper step of the motor pulley. Upon actuation of the switch, the switch segment rotates. This causes the lever fitted into a slot on the segment to move vertically. The drive wheel carried on the swinging arm is then lifted off the motor pulley, moved and replaced on the motor pulley step corresponding to the selected speed.
Tonearm and Tonearm Bearing
Tubular tonearm, extra lightweight, torsionally rigid tonearm of the Dual 1229 Q pivots both horizontally and vertically on needle bearings and precision ball bearings in hardened and polished races. lt is suspended in a gimbal arrangement. This keeps friction to a minimum.
Vertical pivot friction = 0.007 gram
Horizontal pivot friction = 0.015 gram
referred to stylus tip
The arm is thus able to track extremely well. The tonearm head is removable. Before setting the tracking force for the cartridge being used, set the tracking—force scale to zero and balance the tonearm. Initial balance is by sliding the counterweight .Final adjustment is by turning the weight. You can balance cartridges with a weight of 1 to 10 grams.
To reduce the effects of small shock impulses on the arm, the counterbalance weight is resiliently mounted on a threaded spindle, and friction—braked to prevent accidental rotation. The cartridge holder will accept all cartridges with international standard mounting centers of 1/2 inch. Stylus force is set by turning a calibrated housing which stresses or releases a spiral spring contained inside. The scale adjustment is calibrated from 0 — 3 p, from 0 — 1.5 p at 1/10 p and from 1.5 — 3 p at 1/4 p intervals. Tracking forces of mors than 3 p can be adjusted with the help of the counter—weight on the tonearm; turning left (counter—clock—wise) increases the tracking force by 1/2 p per complete turn.
Specifications
Drive : Dual synchronous/continuous-pole motor, with radial elastic suspension
Platter: Non-magnetic, dynamically balanced
platter Weight: 3,1 kg
Platter Diameter: 305 mm
Platter Speeds: 33-1/2 ; 45 and 78 rpm
Pitch Control: Range of variation, one semitone (6%), on all three speeds
Stroboscope: For 33 1/3 and 45 rpm speeds. I Iluminated by special neon glow lamp
Speed Variation: less than ± 0.06% according to DIN 45 507
Noise (Measured according to DIN 45 500):
Rumble 42 dB below standard signal
Weighted audible rumble 63 dB below standard signal
Tonearm: Torsionally rigid, extra-long tubular tonearm in four-point gimbal type bearing
Maximum Tracking Error: 0.16°/cm
Tonearm Bearing Friction (referred to stylus tip)
Vertical : less than 0.007 gram
Horizontal : less than 0.015 gram
Tonearm Head (cartridge holder) : Removable, accepts all cartridges weighing 2 to 10 grams and having standard 1/2" mounting centers
Current Type: AC 50 or 60 cycle, with appropriate motor pulleys
Line Voltage: 110/130 V and 220/240 V selector
Power Consumption: < 10 watt
Current Requirements
approx. 62 mA at 220 V 50 cycle
approx. 115 mA at 110 V 60 cycle
Dimensions (W x H x D): 14-3/4" x 3" x 12"
Weight: 7.2 kg unpacked