Originally Posted by
MartinT
Those straight arms are simply laughable. The tracing misalignment distortion must be incredible. All done for the looks!
It's not for looks at all as the decks were designed for hard scratch use. Think about a conventional arm - you apply anti-skating to pull the arm back out in order to counteract the natural inward pull of the groove when the record is spinning. Now reverse the direction of rotation of the record and suddenly that bias is pushing the arm in the SAME direction as its natural pull. The upshot is the arm jumps out of the groove unless a shedload of stylus pressure is applied.
The straight Vestax ASTS (Anti-Skipping Tonearm System) has a dead band in the centre of the playing area where the arm has no tendency to move either in or out - do your scratching here and it's completely stable.
OK so it's not ideal for hi-fi use, but Vestax did some variants with conventional S-shaped arms. Furthermore, with a spherical stylus running at its recommended pressure (I use an Ortofon OM Pro S at 3g), I can hear no horrendous distortion on my PDX-8000!
Engineers: fixing problems you didn't know you had in ways you don't understand.