There are few inherent problems with the esteemed Pink Triangle
turntable, but one of them is the axial play that can occur at the top
of the bearing housing.
Although the mass of the turntable tends to centre the pivot ball of the
bearing into the centre of the sapphire cup, there is a sideways pull
from the drive belt pulling the platter towards the motor. This effect has a tendency to pull the pivot ball in the bearing to the
edge of the sapphire cup. This problem is further enhanced if the
bearing has been poorly assembled. The result of these anomalies is a barely
detectable 'wobble', but this 'wobble' will have a detrimental effect on
the reproduced sound quality.
To correct this 'wobble',
we have re-positioned the motor onto the sub-chassis, inline between the
platter spindle and the centre of the tonearm board, similar to the PT
Anniversary thus producing a better balanced system. Also, If
the platter is driven from three equal points about its circumference
then the 'wobble' problem is eliminated. To achieve this, we have placed two pulleys and the motor pulley equally
spaced at 120° about the circumference of the belt recess in the
The result of all this, is an unbiased
rotation that is true to the centre of the platter bearing and produces
a much enhanced sound quality which is deemed by many as being the prime
enhancement that is overlooked by turntable manufacturers.
Also, due to the platter now having a balanced
drive, there is less 'judder' when the motor is switched on or when the
speed is changed, so there is less likelihood of the belt jumping off
Conversion consists of
New carbon fibre/foam
composite Sub-Chassis, with new mountings for the repositioned motor
and Idler pulleys.
Two different diameter Idler Pulleys and
Pulley Spindle assemblies.
New Acrylic Top Plate
available in clear or black (Carbon Fibre available at extra cost).
These component parts
are manufactured in our workshop using CNC machining centres and CNC
lathes. The conversion assembly is skilfully performed by our staff as
is the final testing.
This conversion isn't
cheap, it's priceless!
the old adage says,
and in this case it is very true.
plinth in the photo's is made from Maple timber and lime waxed to
achieve an attractive light colour, these can be made to order. We also
offer new plinths in other types of wood to your choice.
Fitting the Tri-Drive Belt: -
Notes to be added later when we have some more photos.