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On some models the motor sits outside the platter and the belt runs around the outer edge of the platter on others the platter is in two parts with an inner spigot for the belt, with the motor sitting between the spigot and outer edge of the platter. Platters that ring store energy and release it slowly back into the record, causing loss of fine detail.īelt drive turntables use a small motor turning fairly rapidly, and a belt then transfers the power from the motor spindle to the platter. The platter should ideally be acoustically dead, ie. The platter is the rotating part which supports the vinyl record while it is played. Counterweight markers are notoriously unreliable and a scale is often employed to get a correct measurement of the counterweight setting.S-shaped tonearms are shaped to reduce tracking error but (XXXX list issues). In practice they require a motor to move the tonearm, with some known error in correct positioning, as well as some vibration. Linear tracking arms, in theory, have zero tracking error. Tracking errors, representing angular deviations between the stylus and the record groove, are present with every tonearm, and different designs use different approaches.The mass can sometimes be incompatible with the mass of the cartridge and the compliance of the stylus, leading to an excessively high or low resonant frequency that induces skipping or rumble, or can negatively affect low frequency performance. The mass of the tonearm affects the resonances of the playback system.There are several objective differences between tonearms: Key differences between tonearms include: All quality turntables include a mechanism, usually hydraulic, to slowly lower the tonearm. The tonearm must be lowered slowly onto the disk to prevent damage to the disk or the stylus.A force, the anti-skate force, is applied to the tonearm, pulling it outwards from the center of the disk, to counteract forces during playback that pull it towards the center.A counterweight is placed on the back to reduce the force of the needle on the record to very low levels, usually equivalent to an effective mass of roughly one gram.They hold the cartridge on top of the record, keeping it properly aligned, and carry the wires down to the plinth.Build quality is important and may be lacking, even for audiophile turntables. Isolation issues can be resolved through the use of additional isolation placed underneath the turntable. There are few objective criteria for plinth design. Certain very expensive turntables use this method. Physical separation of the turntable components from each other, and individual isolation of each component from the ground.In some form or another most audiophile turntables use this method. A plinth of multiple levels, each level isolated from the other by some rubber-like substance.Usually found only on vintage turntables. A box, often wooden, holding a metal plinth supported by springs.
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The basic function is to isolate the components mechanically from the base of the turntable and from each other. The plinth is the base of the turntable, on which the platter (and usually the motor) rests.