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THE PLATTER IS THE MOTOR.
One of the problemFisher introduces a major advance in audio technology: the linear motor 120 pole, direct drive turntable.s in improving direct drive turntable performance is reducing wow & flutter due to cogging action of the motor.
With its limited number of poles (usually 12) and its relatively slow operating speed, most conventional direct drive systems also have an inherent problem of low starting torque.
To solve these problems, Fisher has engineered the linear motor, direct drive system. The new Fisher MT6225.
In effect, the platter becomes the turntable's motor. And Fisher's 120 pole design practically eliminates cogging action, and lowers wow & flutter to a totally inaudible 0.03%.
The linear motor direct drive system further reduces turntable rumble to an extremely low -70 dB, far below hearing level.
HOW IT WORKS
A continuous band of ferrite material, containing 120 magnetic poles, is attached to the inside bottom rim of the platter. To start platter rotation, each pole opposes one of the electro magnetic drivers on the base top.
Each of the 120 poles is attracted or repelled as it passes the driving electro magnets for smooth, stable operation.
BOTTOM VIEW OF PLATTER
120 pole permanent ferrite magnetic band.
An electronic sensing device monitors the platter's speed, and acts as a servo-feedback control to maintain Electromagnetic drivers and servo-speed control sensors Spindle practically perfect speed accuracy.
Built-in strobe and pitch controls are provided.
The speed accuracy of the system is independent of line voltage fluctuations.
THE ARM
The Fisher MT6225 is equipped with a professional-type gimbaled tonearm for performance to equal its technically advanced motor design.
The arm accepts all standard cartridges. The auto-return system, which returns the arm to rest at end of a record, is designed 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 a heavy cast-aluminum platter, and a massive integrated base to absorb vibration.
In all, there is no other turntable available that comes closer to the perfect performance ... or the ultimate in reliability.
See the new Fisher MT6225 now at fine audio stores and the high fidelity section of department stores.
FISHER The first name in high fidelity Fisher Corporation, 21314 Lassen St., Chatsworth, Calif. 91311
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Motor: Linear Direct Drive
Wow & Flutter 0.03% WRMS
Tracking Force Range 0.6-3.5 grams
Rumble -70 dB (DIN B)
Maximum Tracking Error ± 1.5°
Auto Stop--Yes
Auto Reject--Yes
Cueing--Viscous Damped
Anti-Skate Control: Adjustable
Platter Weight 2.2 lbs.
Speed Selector: 33/45 rpm
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(High Fidelity, Nov. 1977)
Also see:
JVC turntables (ad, Nov. 1977)
Dual turntables (ad, Nov. 1977)
Lenco Turntables (ad, Nov. 1977)
Technics Linear Phase speakers (ad, Apr. 1977)
Technics by Panasonic -- SL series turntables (ad, Nov. 1977)