Quartz-Locked Auto Return Turntable (1983-1985)
There are only two major difference between the QL-A220 and the QL-F320: first, the QL-A220 is an auto-return rather than a fully automatic model. And two, the QL-A220 lacks a Repeat function. Therefore, in terms of accurate performance and high-technology engineering, these models are identical.
To monitor platter speed and send correcting signals to the direct drive servo motor hundreds of times a second, a Double Servo Quartz control system is used. In this way, wow and flutter is always kept below 0.025%. Cogging, tiny speed fluctuations that standard direct-drive motors are susceptible to, is totally absent in the QL-A220 thanks to its coreless motor.
There are two reasons why we made the tonearm of the QL-A220 lightweight and straight: one, it improves it's sensitivity, thus it handles record warps easily for clearer low frequency response. And two, it has a resonance frequency that is higher than warp frequencies so resonance cannot cause mistracking and muddy sound.
We've lowered the dynamic fulcrum of the tonearm so that it is level with the record-stylus fulcrum. This reduces angular variations caused by warps, thus reducing effective wow and flutter and improving tracking.
We've used another innovative idea in the QL-A220 to combat acoustic feedback. The tonearm and motor float on an independent sub-assembly within the cabinet: this effectively isolates the most sensitive components from vibrations transmitted by speakers, footsteps, etc. Even physical jarring when operating the control buttons won't budge the tracking stylus.
The simplified controls of the QL-A220, even arm cueing, are up front and can be used with the dust cover closed. For maximum convenience, the tonearm automatically lifts, returns to rest and the power to the motor shuts off at the end of play.
Type: semi automatic turntable
Drive method: direct drive
Motor: coreless DC servo motor
Platter: 890g, 300mm die cast aluminium
Wow and flutter: 0.025% wrms
Signal to noise ratio: 78dB
Tonearm: static balance, straight arm
Effective length: 220mm
Cartridge weight range: 4.5 to 8g
Dimensions: 435 x 105 x 360mm
220/220B instruction/owners manual - musicbox4
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