@cleeds,
"Your claim can only be accurate if the pickup arm (or turntable) itself is not "true." That is, the arm cannot be raised or lowered while also remaining absolutely perpendicular to the turntable platter.
Or perhaps, like mijostyn, you don't understand what these angles define."
Often wrong, but never in doubt.
In the first place, the arm perpendicular to the platter?
Let me make it easy for you. Make believe that instead of the usual offset, the cartridge had a 90 degree offset from the arm. Of course this would never be, but play along for a moment. Surely then if you raised the arm the azimuth would change. Right?
Now consider changing the offset angle a bit towards a reasonable one. Then the arm being raised would change the azimuth, but a bit less and would continue to do so less and less until the cartridge was lined up with the arm, no offset. Can you see it now?
"Your claim can only be accurate if the pickup arm (or turntable) itself is not "true." That is, the arm cannot be raised or lowered while also remaining absolutely perpendicular to the turntable platter.
Or perhaps, like mijostyn, you don't understand what these angles define."
Often wrong, but never in doubt.
In the first place, the arm perpendicular to the platter?
Let me make it easy for you. Make believe that instead of the usual offset, the cartridge had a 90 degree offset from the arm. Of course this would never be, but play along for a moment. Surely then if you raised the arm the azimuth would change. Right?
Now consider changing the offset angle a bit towards a reasonable one. Then the arm being raised would change the azimuth, but a bit less and would continue to do so less and less until the cartridge was lined up with the arm, no offset. Can you see it now?