12/16/2023 0 Comments Cartridge alignment protractor![]() Why so many different alignment strategies? Well the answer is simply that each one results in a different deviation curve from first track to last. Uni-Din: Null points are 63.3 and 112.5 mm.Stevenson: Null points are 60.325 and 117.42 mm.Loefgren B: Null points are 70.3 and 116.6 mm.Loefgren A: Null points are 66 and 120.9 mm Over the years several alignment strategies have been developed based on different null points. As is always the case, there are choices. It turns out that it is possible to create 2 null points across the complete arc and that this strategy will produce the optimal (or smallest error) alignment. A null point is defined as a point where the deviation from the groove tangent is zero. Obviously, this means that it is impossible to maintain the perfect tracking angle throughout the arc of the stylus. A pivoted tonearm, however, tracks in an arc across the record therefore the tracking angle constantly changes from the first groove to the last. Linear tracking tonearms are designed to be tangential to the record groove at all times, thus, the angle between the stylus and the groove does not change and there is virtually no deviation from the optimal tracking angle. Of course, everyone wants to minimize distortion so properly aligning the stylus is important. Misalignment between the stylus and the groove causes distortion. Those who already have a good understanding of the subject can skip to the product review section. Assuming that others might be in a similar situation, it was decided to include some basic principles. While preparing to write this review, it rapidly became evident that yours truly's understanding of this subject had some significant holes in it. Product name: Cartridge Alignment Protractor
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