lewn,
Yes, of course this has nothing to do with pitch.
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?
I suppose that since the speed variation from the stylus movement angle is lower than most W&F specs it is not really a concern.
^Well put^ sir, that is exactly what I was trying to say.
The fact that the cartridge moves some number of degrees of platter rotation, effectively would be the same as running the platter bit faster or slower… assume that the patter was, say, perfect in its speed, The fact that the platter speed variation is greater than this Mathematical tracing delta makes it somewhat a moot point. |
Thanks @4krowme it was great that Larry could describe it better. I felt like a scratch DJ moving the platter back-n-forth over the protractor when it occurred to me. So it is more of interesting… but not entirely relevant. If we had a short recording where the tracks were widely spaced, then the error gets bigger than say a super long “LP” record with more tracks being closely spaced. |
@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. |