thom_mackris
Given how we've learned that a stylus tracking at 2 gm. can modulate the speed of even a massive platter ... I've seen this claim before, but never seen any proof of it. I've measured the speed of my turntable with it 22-pound platter as it plays an LP and never detected this sort of speed deviation. |
thom_mackris... I’ve seen stylus tracing induce speed instability on
some turntables but not on Galibiers. Mass absolutely helps. Agreed! If the movement of a phono cartridge stylus affects the speed of a turntable, there is something very wrong in the turntable's design. |
decibellI
believe it is safe to say that maintaining absolute platter speed in
the presence of an ever changing load (friction from needle tip) is
physically impossible! Please explain how the speed of a 22-pound spinning platter can be altered by a stylus whose force is measured in grams.
Please tell us about the measurements you've made that support your belief.
Belt drives with very long and flexible belts allow more platter
movement - idler drive systems with direct coupled idler connection and
stiff motor support allow very little angular platter movement with same
amount of torque applied to the platter.
There's no "angular platter movement" on my belt drive table. It's a VPI.
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harold-not-the-barrelStylus drag is surprisingly strong, platter´s very high mass helps but does not eliminate it.
I'm with Thom. There's absolutely no measurable or audible slowing of a turntable platter caused by "stylus drag" if the platter is of sufficient mass and the rest of the turntable is properly designed.
Of course, if you're using one of the common, cheap, lightweight turntables, then I suppose it's possible.
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totem39573 posts. Regarding "stylus drag" affecting the speed of a properly designed turntable with a platter of sufficient mass:
Not measurable was put to rest forever.
This was talked to death in the Sutherland Timeline thread
You're clearly mistaken, because there are two people in this very thread who have contrary evidence. One of them is Thom, a turntable designer. As for myself, I've actually made the measurements, rather than just relying on others' opinions.
It's easy to understand if you think about it. So-called "stylus drag" is a deviation that would be measured in fractions of a gram. If you consider a 22-pound platter spinning on a low friction bearing, it's pretty far-fetched that such a tiny change in force could have such a big effect.
I've even tested this with the Telarc 1812 LP, which has some of the most heavily modulated grooves ever pressed on LP. Note that this is also on a turntable that uses a threaded reflex clamp; that eliminates the chance of the disc itself slipping on the mat, which of course would skew the result.
To be clear, I don't doubt that this is a problem with some LPs on some turntables. And LP playback is surely fraught with challenges. But the effect of stylus drag on platter speed? That's a solvable problem. |
