Tangential vs Tone-Arm

3 replies
With a standard "tone-arm" turntable, the record groove moves the needle across the record. Does this happen with tangentials? I am watching my BG 3000 play a record, and I could swear the arm moves independant of the groove. Comments?
With a tangential arm the arm is moved by a motor. When the arm has a certain angle to the tangens (the right line of the groove) the motor moves the arm a little inwards. 
How cool is that? Thanks for the confirmation.
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