Sorry if this reads like an advertizing pamphlet, it isn't supposed to be one...
Hi Peter,
Yes, the arm's geometry will affect the actual rpm, --- just like a conventional pivoted arm does(think about it.... Only a straight line, linear tracking arm doesn't produce this effect.
BUT.... according to this:
http://en.wikipedia.org/wiki/LP_album
"The average LP has about 1,600 feet of groove on each side, or about a third of a mile."
So the discrepancy(less than two inches or 5cm) will not be perceivable by mere mortals. Even very high quality measuring equipment won't show that difference.
Happy New Year!
Frank
Hi Peter,
Didn't see your follow up question, sorry....
On (almost)ANY arm, be it a linear tracking arm or a pivoted arm, the effective length and therefore the overhang will change once the arm's bearing for the vertical movement is moved up-or downward. As far as I recall, only the ET2 linear tracking arm features a base that takes the displacement into account. On my magnet/thread bearing arms, any VTA change is essentially compensated for by the armwands's forward movement when the back is raised and vice versa.
On a pivoted arm, the resulting changes will simply "move" the Null points and increase the distorsion maximum ever so slightly.
On a linear tracking arm, the displacement is easy to calculate(Pythagoras) and may only become a problem with very short linear tracking arms.
Don't forget that the eff. length changes too when you alter the tracking force.
Again, the actual change is usually below the threshold of repeatable adjustment accuracy achievable by a normal human being.
All the best,
Frank
Hi Peter,
On most tonearms, changing arm "height" or VTA by more than 1mm will have an effect on the tracking force, likely to be audible. Some carts have a VTF "sweet spot" that is within +/- 0,02gr. A VTF change any larger will alter the vertical cantilever deflection enough to dwarf the 1-2mm VTA/SRA change.
Best,
Frank
Hi Peter,
On most tonearms, changing arm "height" or VTA by more than 1mm will have an effect on the tracking force, likely to be audible. Some carts have a VTF "sweet spot" that is within +/- 0,02gr. A VTF change any larger will alter the vertical cantilever deflection enough to dwarf the 1-2mm VTA/SRA change.
Best,
Frank
Hi Sean,
Congratulations on getting the LT arm installed!
Did you get the silver wire version or the copper wire version?
(mine and John's are the silver wire).
Arnie
Makes me want to listen to my whole vinyl collection again to hear how it sounds through this arm.
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