During mid 2021, the British Library (BL) approached True Point Audio about the
possibility of manufacturing a tonearm that was capable of playing 20" diameter
record discs at 120 RPM. BL wanted to transcribe the disc information onto tape
were it would be more durable.
These early Pathe' recordings are made of shellac and the discs are
approximately 1/4" thick with a mass of approximately 4Kg, and are very fragile.
The disc also plays from the inside to the outer edge, the opposite of today's
discs. The following photos shows one of these discs, and
testing done by the British Library on the performance of the 14" tonearm.
BL supplied the Technics SL 1210 turntable, which was stripped down and modified
to accept the 20" disc. This included raising the platter height and making an
extended armboard. We also modified an SME tonearm, and made a 14" armtube for
it which had to be set back on the aluminium armboard.
Technics SL1210 turntable and SME tonearm is shown above.
BL testing the
all went well, and BL have accepted the tonearm and turntable.
© True Point Audio Ltd