I recently decided to acquire a Thorens TD-150 to use as the basis for a high performance turntable similar in design to the Linn LP12, though (as I am not at all a fan of Linn products) without using any Linn parts. That particular turntable can be found Here. During the course of the project however, I ended up with two TD-150s and so decided to construct a second deck and keep it relatively stock, though with a vastly superior plinth.
This project recycles the top plate, sub chassis, platter and bearing and motor from the TD-150. The custom Maple plinth is in 25 mm thick solid maple and is more compact than the original TD-150 design, but is actually build to Linn dimensions. This is to accommodate a wider arm board, which too is machined from maple.
Nothing special was done to the electronics, besides replacing the existing resistors and capacitors with new components for reasons of safety and longevity. I also grounded the top plate and sub chassis. I kept the original mechanical speed change mechanism, which simply pushes the belt onto the two sections of the pulley and does so very effectively.
I have yet to add lettering to the speed dial, but it is really quite simple and is exactly as a stock TD-150. Right is 33, left is 45 and the middle position is 0 or off. The arm is an unmodified Rega RB202, currently holding an AT95E cartridge.
I recently carried out some upgrades to this deck. They include a thrust bearing to support the motor shaft, and a static isolation system. The isolation system comprises three rubber grommets in place of the suspension springs. These eliminate the ‘bounce’ and the unwanted lateral motion caused by the rotating platter, but at the same time offer better isolation and a less troublesome setup procedure. They are also far less likely to drift so the setup should stay ‘in tune’ with little to no tweaking required in future.