Octave Audio - Main Platter Bearing with Shaft

By: Octave A Audio Us  09-12-2011
Keywords: Pricing Information, MASS PRODUCTION

Octave Audio - Main Platter Bearing with Shaft

Main Platter Bearing with Shaft

The main platter bearing is the nerve center of any drive system. While Thorens was extensively involved with developing the TD 124 bearing, the bearing itself was manufactured by and sourced from suppliers. When first introduced, plastic bushings were used, roughly through the middle of the Series I. From the standpoint of decoupling, this is an excellent solution, but the combination of the heavy rotational force of the drive system and insufficient tolerances of the supplied parts inevitably resulted in extensive wear. For this reason, Thorens substituted bearings whose tinned bushings functioned as an oil reservoir. With these bearings, extended use resulted in structural degradation of the bearing, drying out of the oil and erosion and wear on the bushings. Under these conditions, there is a noticeable increase in noise, and rotational accuracy can no longer be maintained. While the development department repeatedly experimented with alternative bearings over the years, management rejected each of these solutions on cost grounds. We managed to obtain two favoured prototypes from the former head of development in Sainte-Croix. Advances in machining, and the absence of mass production cost constraints, have made it possible to fully realize the creative research which is embodied in these prototype solutions.

Our Main Platter Bearing with Shaft brings the following improvements::

  • dramatic reduction in noise
  • fundamental improvement in dynamic contrasts
  • tighter and more accurate bass

Replacing the main platter bearing for all TD 124 Mark I models with serial numbers up to circa 25000 is urgently recommended – these models have the plastic bearing bushings. Moreover, we highly recommend a bearing replacement - independent of the serial number, and including the Mark II series – where there is excessive bearing play.

The set includes a complete main platter bearing with shaft, an addtional replacement bearing thrust plate and oil gasket und a bottle of Thorens oil.

The new main platter bearing/shaft can be installed in 6 easy stages:

  1. Remove the main platter as described in the instructions for installing the non-magnetic main platter (steps 1-4)
  2. Carelly remove the tone arm board/tone arm according to the procedure for installing the replacement tonearm board
  3. Undo the main platter bearing screws from below and pull the old bearing upwards
  4. Insert the new bearing from above and tighten the screws from below.
  5. Screw the main platter back according to the mounting instructions (points 5 through 10)
  6. Reinstall the tonearm board.
Pricing Information

Item # 1201$890 usd

The information in this article was current at 06 Dec 2011

Keywords: MASS PRODUCTION, Pricing Information

Other products and services from Octave A Audio Us


Octave Audio - Plinths

Our "Solid Design" plinth was developed to satisfy demands for a massive plinth which could deliver real sonic improvements (NOT the case with many of the replacement plinths we've encountered, which are sonically detrimental to the TD 124's performance). Replacing the plinth is simple - just lift the chassis out of the original and place it in the new one, making sure that the rubber mushrooms and their metal supports are correctly seated.


Octave Audio - Hardenet Alloy Upper Platter

After experimenting with various casting and machining properties, extensive sonic tests led us to eventually choose a much harder aluminium alloy, more difficult to shape and machine than the original but delivering improved sonic performance. Our goal, as always, was to produce a "new vintage" product which respects the sonic, mechanical and aesthetic properties of the original Thorens part while offering advances in sound quality.


Octave Audio - TD 124 Tonearm Boards

The shape of the 12" armboard has been expressly designed for resonance control, bringing with it substantial sonic improvements. Our replacement armboards for the TD 124 are hand made from select beech by Swiss craftsmen. Carefully adjust the tonearm according to the manufacturer's instructions. Taking care not to forget all grounding wires. Octave Audio - TD 124 Tonearm Boards.


Octave Audio - Non Magnetic Main Platter

Our replacement platter is manufactured from raw materials chosen without compromise, followed by state-of-the-art casting, precision machining and finishing and faithful reproduction of the original strobe markings, all carried out by the finest Swiss specialty firms. Thorens chose cast iron for the TD 124 series due to its outstanding properties: high density and damping capacity, great rigidity and extraordinary dimensional stability.


Octave Audio - Tone Arms from Ortofon

VTF in the range 0-5 grams can be precisely adjusted by means of the supplied digital force gauge. With dynamic balance graduated vertical tracking force control through a new spring design. Ortofon now introduces tone arms to the North American market. Dynamic tone arms: RS-212-D and RS-309-D. Static tone arms: AS-212-S and AS-309-S.


Octave Audio - Moving Coil Cartridges

Many of the first generation of moving coil cartridges were low impedance and low output units which demanded a transformer or a comparable step-up device. Some of today's most exclusive moving coil designs still deliver the ultimate in analogue sound quality through a specially developed matching transformer. Each of the four coils contains between 11 an 24 turns of wire, depending on model, and has to be wound by hand under a microscope.


Octave Audio - Motor E 50 MK I / MK II Conversion Kit

This was recognized early on by Thorens, and accounts for the differences in motor decoupling between the TD 124 Mark I and Mark II models. Correct decoupling of the motor from the chassis is a key element in any turntable design. The motor suspension rods were lengthened and additional damping devices. Motor E 50 MK I / MK II Conversion Kit.