One of the problems in improving turntable performance, especially with direct drive systems, is the difficulry of reducing woa and flutter due to cogging action of the direct drive motor.
With its limited number of poles (usually 12) , a conventional direct drive system has an inherent problem, at its relatively slow operating speed, of low starting torque.
To solve these problems and improve turntable performance, Fisher has engineered the linear motor, 120 pole direct drive systems.
The Platter is The MotorIn effect, the platter becomes the motor of the MT6225. and Fisher's 120 pole design practically eliminates cogging action and wow and flutter - to a totally inaudible 0,03%
And the linear motor direct drive system further reduces turntable rumble to an extremely low -70 dB, so far below hearing level to be completely inaudible.
How it worksA continuous ring of magnetic material, containing, 120 magnetic poles, is attached to the inside bottom rim of the platter. As the platter rotates, each pole opposes one of the electromagnetic drivers on the base top. Each of the 120 poles is attracted or repelled as it passes the driving electromagnets for smooth, stable operation.
An electronic sensing device monitors the platter's speed, and acts as a servo feedback control to maintain practically perfect speed accuracy. A built-in strobe and pitch controls are provided. The speed accuracy of the system is independent of line voltage fluctuations.
The ArmThe handsomely styled Fisher MT6225 is equipped with a professional type horizontal and vertical gimbal suspended tone arm for performance commensurate with its technologically advanced design.
The arm accepts all standard cartridges. The auto-return system which returns the arm to rest at the end of a record is also an advanced design with no restraints on its lateral or vertical motion during operation.
The arm has adjustable tracking force with calibrated settings from 0,6 to 3,5 grams. There's also precise variable anti-skate, and viscous damped cueing. The MT6225 also has an aluminum alloy die cast platter, and a walnut grain vinyl veneer wood base.
SpecificationsMotor: Linear Direct Drive
Wow and Flutter: 0,03% (WRMS), Rumble: -70 dB
Speed Variation: ±0,5% , Speed Control Range: ±3%
Tracking Force Range: 0,6 - 3,5 grams
Platter: Die cast aluminum, Diameter: 12-15/16", Weight: 2,2 lbs
Record Speed Selector: 33⅓ and 45 rpm
Tone-arm: S-shape form
Resonance: less than 10 Hz, Effective Length: 222 mm
Bearing Type Horizontal : Thrust
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