2. analog
  3. 175743-164631

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?

holmz
dover
2,365 posts
 

 It also disproves your fantasy that phono cartridge tangency affects frequency. 

I have never claimed that.

What I have said is that the stylus on a pivoted arm, for each 1.8 seconds, deviates from the position of the cutter head at the same time interval.

Frequency is a red herring because the deviation would be so small it would probably be less than that generated by normal tt issues around stability.

 

holmz's avatar
holmz OP
2,328 posts
 

I am the OP, so it was my fantasy not @dover .

It is not “tangency”, but the walking of the point across the platter dues the arc of the tone arm.

But as was pointed out in the very opening post it amounts to “a bee’s phallus” amount of shift… I used the term, “it is not much”.

(Where “Bee’s _ick” is the Australian slang term for “a small and almost immeasurable amount”. I believe that the UK uses the acronym of “SFA”.)

 

My main claim was that I found it “somewhat interesting”.

What is more interesting now, is that we do not agree whether it is truely happening, or just a fantasy.
And also that my communication likely uses a lot of body language and hand motion to describe physical things.

cleeds
6,318 posts
 
holmz's avatar
holmz 
I am the OP, so it was my fantasy not @dover .

Oops, my apologies to @dover and you. That's a mistake I really try to avoid.

It is not “tangency”, but the walking of the point across the platter dues the arc of the tone arm.

What you're describing is tangency, I don't know why you're not comfortable with the word commonly used to describe this aspect of pickup arm geometry. Tangency has zero effect on freqeuncy (pitch).  But I'm done with this conversation - the question you've raised is easily answered several ways, as I've already pointed out.

4krowme's avatar
4krowme
542 posts
 

It bears repeating. This was very cool discussion to me. It begs the observation of even daily life. We see what we see, but do we?

 

  Thanks so much for keeping civil a topic that was entertaining and informative.

 

   Cheers, Greg >>>>>>>> P.S. Don't forget to think.

holmz's avatar
holmz OP
2,328 posts
 

What you’re describing is tangency, I don’t know why you’re not comfortable with the word commonly used to describe this aspect of pickup arm geometry. Tangency has zero effect on freqeuncy (pitch). But I’m done with this conversation - the question you’ve raised is easily answered several ways, as I’ve already pointed out.

@cleeds I am not comfortable with the word, because

  1. It is the wrong word.
  2. Tangency does not affect pitch.

According to audio technical what we are talking about is not tangency:

The term “translocation” was used earlier, and that at least is not able to be easily confused with the stylus being parallel to the track, or tangent with the track… which is what “tangency” commonly refers to.

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