BEYOND DIRECT DRIVE: THE FISHER LINEAR MOTOR TURNTABLE
above: MT6225A
The direct drive turntable was a great advance in record playing precision.
But Fisher has now taken turntable technology a major step further with the
MT6225A Linear Motor turntable system.
Conventional direct drive systems do a great job of reducing rumble. But the small diameter and relatively few poles (usually 12 or 16) of the motor result in low torque and a distinct "cogging" tendency that can make them susceptible to wow and flutter.
The Fisher linear motor, by contrast, uses 120 poles and a unique 3-phase electronic drive system that produce a perfectly timed sequence of closely overlapped drive impulses. So cogging is, for all practical purposes, eliminated. And wow & flutter are held to an incredibly low 0.03% WRMS.
Speed control in the MT6225A is accomplished via special feedback sensing coils that operate on the same magnetic poles that drive the platter, ensuring instant response to transient loads and long-term speed accuracy within 0.5%. Both 33 and 45 rpm speeds are independently adjustable over a ±3% range, and may be set exactly with the built-in stroboscope.
The tonearm of the MT6225A is as advanced as the drive system, and features an extra-long low mass tubular arm balanced both vertically and laterally.
Mounted in a low-friction gimbal assembly and equipped with calibrated anti-skating, the arm tracks even the most delicate audiophile cart ridges with ease. Viscous damped cueing and automatic shutoff are provided, plus a Reject button that returns the arm and stops the turntable at any time during play.
The MT6225A is mounted in a heavy, beautifully finished base equipped with adjustable feet and a built-in bubble level that makes it easy to set the turntable perfectly level for best performance. The level also serves as a stylus overhang indicator for precise cartridge mounting.
Considering the extremely high performance and "beyond state of-the-art" engineering of the MT6225A, you might easily expect to pay $400 or $500 for it. But Fisher ingenuity (born of 42 years refining the high fidelity art) enables us to offer it at a price below that of many turntables that don't perform as well: $250*. The same linear drive system with a slightly different tonearm is available in the MT6224, priced at $200*.
Only Fisher could go beyond direct drive, and still stay within reason.
See the sensational linear drive turntable and other fine Fisher turntables priced from $120* at selected audio dealers or the audio department of your favorite department store.
*Manufacturer's suggested retail price. Actual selling price determined solely by dealer.
New guide to buying high fidelity equipment.
Send $2 for Fisher Handbook. with name and address to Fisher Corp., Dept. H, 21314 Lassen St., Chatsworth. Calif. 91311.
FISHER -- The first name in high fidelity.
(Source: Audio magazine Feb. 1979)
Also see:
Fisher MT6250 linear drive turntable (Jun. 1979)
Garrard direct-drive turntable (Feb. 1977)
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