I made up my mind about the tonearm and it shouldn´t be the best way to "linear".RockerFrank wrote: Well there we have it. Way cool. I'm a little suspicious about the tonearm, but that may just be because it's different.
As there originates no scating-force because the cartridge is parallel to the groove, but there still is friction between stylus and groove which does pull more or less the cartridge forward.
On a "normal" linear arm the pull would be opposed to the tonearms mounting and by that not having any effect - but on this arm the pull is at an 90°angle to the mounting and by that "bending" the whole arm.
The bending off course should be very small, but should be biggest when the arm is complete expanded (at the end of the record).
In the end the guide rails, or whatever holds the arm, have to be very high precision to keep the arm from moving forward or backward (also keeping it from vibrating) - but at the same time must enable the arm to easily move from right to left.
So not the best construction principle for a linear from a technical point of view.