Garrard zero 100 tonearm effective length
As a result, the half circle above the hypotenuse of a right-angled triangle is called the Thales Circle." The changing angle is always 90 degree to the radius because it is part of a triangle that is inside a semi-circle that adheres to the Thales theorem, that is, "Thales discovered that the circumferential angle subtended by a triangle in a semicircle is always a right angle. It is a pivot style tonearm with an extra pivot at the headshell area right above the stylus. By now, many people have heard of the Thales tonearm from Switzerland. The best examples are actually currently available in production. We want to talk about pivot tonearms that can track tangentially by changing stylus angle simultaneously. Anyway, this thread is NOT about the above tonearms. The genre of electronic servo detection pseudo-tangential trackers like the Rabco tracking across the record in tiny little arcs constantly self correcting its way to the end of the record is not part of this discussion here. And the use of an air pump is not for everyone to say the least - a personal pet peeve of mine. It limits the choices of stylus, depending on its compliance. The flaw of such tonearm is that the horizontal mass is enormous regardless of bearing quality, low friction or no friction. Some concept arms even suggest using floating opposing magnets. Other means of this gliding action can be also achieve via linear bearings like rollers on a rod or bushing on a rod, etc. To be brief, most tangential tracking tonearms are typically air-bearing tonearms that allows the stylus glide across the radius in almost frictionless manner to simulate how a record is cut on a lathe. Sounds like an oxymoron but it can be done. I don't want to go off track in other tonearm threads so I decided to start a new thread focusing on the discussion and design ideas for pivot style tonearms that can attain tangential tracking, a pivot linear tracker if you will. Pioneer Japan probably had stacks of unsold 7L to get rid of.There has to be a way to get that 90 degrees on a stylus without the damn air pump!! The 7L was later in the early 1990s slightly relooked and put by Pioneer USA into its Elite lineup as PL-90. Two small rubber dots each side (on the front isolation clamps) further damp the dustcover's resonance. The black looks hide a very heavy item ( 17,3 kg) and a special set of insulators which sandwich a (semi-)floating structure, leaving aside potential dustcover influences, adding (hidden) U-shaped side dampers and an overall low center of gravity. The electronic tonearm therefore has a longer effective length than usual : 28,2 cm ! Same as that of a PL-70LII.
One thing was however added to try and bank on the also incredible success of Yamaha and its GT-2000 and GT-1000 vinyl spinners : enlarge the turntable itself to 36 cm : better inertia for sure and. The PL-7L is therefore all-black, sports an SHR motor (of the "LII" size, not like the biggabig original) and alumina ceramics DRA to reduce parasitic vibrations off the tonearm, as on a PL-707.
GARRARD ZERO 100 TONEARM EFFECTIVE LENGTH SERIES
Late-in-the-day turntable, made when CD clearly was becoming a winning format and not much Pioneer could do to top the incredible sales of the PL-70 / PL-50 / PL-30 series and their L and LII versions.