@holmz , I understand what you are saying. The translocation of the stylus is so slow that it's effect on pitch is insignificant. Warps in the record surface and eccentricity of the spindle hole are far more significant in terms of pitch irregularity.
TT speed
When I use a protractor to align the stylus I do the alignment at the inside, and then rotate the platter maybe 20 degree when I move the arm to the outside of the LP, or protractor.
On a linear tracking “arm” it would not need to rotate at all.
At 33-1/3, then 15 minutes would be about 500 rotations. And that 20 degrees would be a delay of 18th of a rotation.
So a 1 kHz tone would be about 0.11 Hz below 1000.
It is not much, but seems kind of interesting... maybe?
Showing 2 responses by mijostyn
@cleeds , nice to have you back again cleeds. Theoretically pitch is affected but the effect is so slight that it may well be unmeasurable. @lewm , the turntable spins at a constant speed. As the arm travels in to the center of the record the radius that the stylus is on shifts clockwise, this is what I an calling translocation (I think I borrowed a medical term). This slows the speed of the groove by the stylus ever so slightly lowering pitch. This would probably never be measurable never mind noticeable but, it is real. It is not as professor cleeds says, "zero." |