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A tangential tracking pivoting tonearm
A tangential tracking pivoting tonearm
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Old Today, 04:43 AM   #81
Bon is offline Bon  Australia
diyAudio Member
Join Date: Mar 2004
Location: Sydney, Australia
Originally Posted by Bfpca View Post
If you are playing a record that is off centre, an all to common occurrence, it appears that the tone arm and stylus would be oscillating in and out as the stylus is also moving side to side with each revolution. Would this cause additional pitch change as the stylus velocity is changing with the changes in tone arm length? Sort of a Doppler effect? If so, would this add to the pitch change we are already getting from the left to right movement of a conventional arm, or compensate for it? What would be the degree of this change in comparison to the existing side to side changes?
Eccentric discs would be modulated by the 33.33 rpm cycle or 0.55 Hz. I don't know if this is audible. The 45 degree L, R groove modulations are orthogonal to the tangential direction, which should provide a degree of independence from tangential amplitude modulation.
"Moderation is a fatal thing. Nothing succeeds like excess." Oscar Wilde.
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Old Today, 06:48 AM   #82
johnmath is online now johnmath  Australia
diyAudio Member
Join Date: Oct 2014
Location: Kangaroo Island
Originally Posted by Bon View Post
Eccentric discs would be modulated by the 33.33 rpm cycle or 0.55 Hz. I don't know if this is audible.
It is absolutely audible because the linear grove speed at the stylus position varies with radius; as the radius increases and decreases the pitch warbles up and down, giving a doppler like effect of coming (higher pitch) and going (lower pitch). The same happens with vertical eccentricity (wobbly platter) and warped records where the linear groove speed increases on the rises and falls going back down. Even a fraction of a mm of eccentricity is audible.
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