SG-PTA HB Tonearm

Description

The Vertere Super Groove Precision Tonearms utilise a combination of quality materials, including roll-wrapped carbon-fibre, stainless steel, brass, aluminium alloys and silicon nitride. Its unique bearing design and versatile anti-skate adjustment make it an ideal partner for the highest quality cartridges and turntables.

SG-TPA tonearm bearing

The unique Tri-Pivot bearing consists of three super-round silicon nitride balls held captive in a precision-machined Acetal ball-retaining ring supporting the aerospace-precision machined stainless pivot. The pivot point centred between the silicon nitride balls provides flawless support and articulation.

At first sight, the SG-PTA Tonearm may come across as a uni-pivot; it is anything but.

A uni-pivot will skate about on its bearing point of contact while the tonearm moves side-to-side and up-and-down. There is no such thing as a point; there is one surface supported by another and sliding relative to each other. And because of this, there is always some skating of the contact point on the support bearing surface. Although the skating or chatter may be in fractions of microns, so is the magnitude of some of the information stored in the vinyl groove.

To eliminate this loss of information due to unwanted bearing chatter, Touraj designed the Tri-pivot bearing. Three silicon nitride precision balls and a high precision machined stainless steel pivot point provide the support and the articulation for the arm. Although the tonearm may appear to behave as a uni-pivot, it is without any bearing chatter, preserving as much signal information as possible.

The result is a life-like dynamic response with unexpected clarity, musicality and detail – genuinely unparalleled.

SG Tonearm tube & headshell

Roll wrapped carbon fibre is used in the construction of the arm tube. This provides higher strength and a more homogenous fibre structure than a Pultruded or moulded equivalent.

The headshell is aluminium alloy or Titanium on the HB version. The headshell is connected to the arm tube via a structurally bonded alloy end insert. The naturally non-resonant and higher strength to weight ratio of this configuration provides the optimum cartridge platform.

Aluminium Bearing yoke and Brass pillar

The high-precision stainless steel bearing pivot is structurally bonded to the precision-machined aluminium alloy yoke. The assembly provides the support required for the arm tube, the main counterweight and the anti-skate mechanism.

The pivot point and the counterweight centre of gravity are vertically positioned to be as low as possible. This retains the tonearm in its most stable position by the chrome-plated brass tonearm pillar.

Bearing Transit Screw & Counterweight Locator

The SG-PTA transit screw will prevent any accidental damage to the precision Tri-pivot bearing during shipping. And the counterweight locator will ensure accurate repositioning of the counterweight and eliminate the need to set up the Tracking Weight & Azimuth again.

Arm/Cartridge resonance frequency & fine tracking weight adjustment

An adjustable and decoupled stainless ring allowed to move along the arm tube provides fine tracking weight adjustment.

The relative position of this ring and the main counterweight can alter the arm/cartridge resonance frequency and thus optimise the playback performance of the cartridge.

SG Tonearm Main Counterweight

Attention to detail shines out in the mirror chrome-plated brass counterweight and polished stainless steel peg.

Two pairs of silicone decoupling rings provide the necessary grip for location and the required isolation of the counterweight. Side-to-side moving and lockable Fine Adjustment Azimuth Screw offers an easy and accurate setting of the cartridge azimuth to ensure optimum musical performance.

SG Tonearm Pillar Holder and Clamp

Precision machined from Acetal, the SG Tonearm Pillar Holder and Clamp utilises a Tri-point fixing method to provide the tonearm/cartridge the required interface rigidly coupled to the record player.

Internal Wiring & Contact Connectors

The cartridge tags and the 5-pin connector pins are designed, machined, and gold plated to Vertere exact specifications for the SG PTA. The 5-pin connector main body is CNC machined from solid PTFE for its superior dielectric characteristics. Internal wiring choice of standard Vertere or Pulse HB

Bias-curve adjustable anti-skate mechanism

There is much debate about how to set anti-skate optimally. The ideal setting is affected by tracking weight, record speed, stylus profile and record cut. But it’s the hi-fi business, so there are n+1 arguments as to the correct philosophy. The SG-PTA allows the anti-skate to be set variably across the record – for example, greater at the outside or greater at the inner. The optimal results are established by listening at the beginning, middle and end of a selection of records and choosing the best performance across all three positions.