JEWEL BEARINGS as used by
Makers of fine audio
turntables from 1979 to 1999 as Pink Triangle Projects Ltd, then
2000 to 2003 as Pink Triangle Partnership.
can supply and fit new sapphire bearings for all types of
James Melling Ltd (no longer in
business) were the suppliers of the sapphire bearings for
set up in business in 2002 they
bought the stocks and records from James Melling Ltd, detailing all relevant technical info, including
sales details of products to customers including
thus we are confident that the sapphire bearings that you require for
the replacement of damaged ones are sold on a like for like basis.
Damaged sapphire bearing and ball, mouse over for repaired Bearing.
Occasionally after replacing some sapphire
bearings, when the bearing assembly was rotated, wobble was still present.
Initially we thought that this was caused by excessive wear in the plastic ring
insert at the base of the upper bearing assembly, but on closer examination we
traced the problem to the ball of the bearing assembly being worn and mis-shaped
due to the turntable being used after the sapphire had been damaged. As a result
of this we now check the ball as well as the sapphire, and can replace the ball
as shown above if necessary.
We would appreciate any photos of your
turntable that you are prepared to have exhibited on this page.
Pink Triangle 'PT1', Circa. 1979
Photo Copyright: C. Tay 2013
The original Pink Triangle (PT1 - the companies first
model) with d.c.-motor. However, the older model has the old
bearing type with the bearing ball at the top of the bearing shaft
and the jewel cup inside the upper aluminium housing. On the
later model it's the other way around with the jewel cup at the top
of the bearing shaft and the bearing ball inside the upper aluminium
reconfigure the bearing arrangement on inverse bearing assy's, so
that the sapphire faces upwards similar to later PT bearings. This
greatly improves lubrication retention.
Don (AKA Wulf) 2016
This PT1 was vectored by Don in 2008.
Click on the link below to find out more.
Pink Triangle 'PT Too' model. Circa. 1985
Photo Copyright: J.Semplay 2012
It was supplied with an external a.c.
power supply unit called the Pacesetter.
Pink Triangle 'Little Pink Thing'. Circa. 1990
Photo Copyright: R. Vranas 2013
(entry level turntable)
The LPT models were Pink Triangle's non-suspended designs,
compared to PT1/2/Export/Anni which had a 'floating'
LPT GTi used the Export GTi's electronics, hence: A
Little Pink Thing with Export GTi drive electronics.
Pink Triangle 'Export' model. Circa. 1991
Paul G. Nagy 2015
A PT Too turntable with 'Little Pink
Thing' drive electronics.
Pink Triangle 'Export GTi' model.
copyright: A. Simpson 2014
Export GTi used an uprated twin phase power supply based on
the PT Too's Pacesetter, not the LPT PSU (the standard
Export used the LPT PSU).
Export GTi had an optional dished platter and clamp.
Pink Triangle 'Anniversary' model is their
Photo Copyright: T. Bissell 2012
Pink Triangle 'Tarantella'. Circa. 1997
Photo Copyright: N. Mason 2012
PT Mini Anniversary converted from a PT1 by Tim Bissell
Photo courtesy of Steve Westwood
earliest bearing assemblies were constructed with the ball at the top of the
shaft, and the ruby cup being located in the aluminium upper housing,
whereas the later bearing design has the thrust surfaces transposed,
moderately improving lubricant retention. This later bearing also
had a smaller threaded base which gave
a weight advantage over the earlier bearing.
Please note there is no difference in the mechanical properties
between a ruby coloured synthetic sapphire and the self coloured
(clear) sapphire. The colour is added in the doping process. We
supply self coloured sapphire bearings.
We also buy
turntables. Please let us know if you have one to sell.
We would like to thank friends, PT
enthusiasts and customers for their help in putting this page together, also
a special acknowledgement to Vinyl Engine (www.vinylengine.com)
whose information proved invaluable.
We will be updating this page on a regular basis. If there
is any information that you believe is incorrect or should be added please let
This page is populated with information from a variety
of sources, the accuracy varies and is dependant on the accuracy of the source
materials. It is therefore impossible to guarantee the accuracy of the data
displayed. Users should verify any results prior to making any decisions based
on the data displayed on these pages.
Copyright © True
Point Audio Ltd