SONY PS 2251: a declaration of independence.
Independence of belts, pulleys, idler wheels and all the other paraphernalia
that can cause wow, flutter and rumble. Independence from fluctuations in power
line voltage that can effect the precise speed of the turntable. And independence
of acoustical feedback. The new, direct-drive Sony PS-2251 has declared itself
independent of all these potential intruders upon the enjoyment of your records.
Most turntables use belts, pulleys, idler wheels to make their turntables spin at the record's speed, instead of the motor's. Look underneath Sony's new PS-2251 and all you'll see is the motor. We don't need all those extras, because our motor's speed is precisely the same as the record's.
Eliminating all those parts also eliminates the wow and flutter and rumble they can cause. So, our rumble figure is a remarkable -58dB (NAB). And because our motor turns so much slower than conventional ones, the rumble frequency is lowered too, making the rumble even less audible than that -58 dB figure indicates.
To maintain precise speed accuracy at slow speeds, we use an AC servo system (superior to a DC servo system because of its uniform magnetic field strength). Its precise speed is not affected by variations in line voltage or in line frequency. But its speed can be varied ±4% by the built-in pitch control and returned to a precise 33-1 /3 or 45 rpm, with the built-in self-illuminated strobe.
Then we matched it with a statically-balanced tonearm that tracks records as precisely and faithfully as our turntable turns them. We added viscous-damped cueing and effective anti-skating. And we mounted the PS-2251 on a handsome wood base using an independent spring suspension system to completely isolate it from externally caused vibrations.
At $349.50 (suggested retail) including arm, wood base and hinged dust cover, the PS-2251 is today's most advanced turntable.
We also offer a moderately priced, single-play component turntable with the convenience of automatic operation, the PS-5520. The complete system: turntable, arm, walnut base and hinged dust cover, $159.50.(suggested retail)
Sony Corporation of America 47-47 Van Dam St. , Long Island City , N.Y. 11101 .
(Audio magazine, July 1973)
Also see:
Sony PS-X600 turntable (Dec. 1981)
Sony PS-X70 turntable (Mar. 1979)
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