Strathearn Audio Limited

Strathearm Audio Limited

Keith Douglas Ridler

Colin Howard Stanwell-Smith

Alexander Bennett Gosling

Frederick James Easthope

Gordon Malcolm Edge

Dexter R Plummer

Gerald Avison

Gordon Malcom Edge

Robert Charles Whelan

A linear bearing arrangement has a slider which slides in a channel in a slide and a layer of magnetic lubricant material which adheres to a magnetized region or regions of the slide, slider or both.

Linear bearing for parallel tracking arm

Method and apparatus for accurately controlling the position of a first member such as a phonograph stylus relative to a second movable member on which it is carried.

Control device

An arrangement for use in indicating the speed of rotation of a body including a switch operated by elements which rotate according to the rotation of the body, a frequency generator which has an output signal at a frequency related to the desired speed of rotation of the body and an indicator which is actuated in accordance with the signals from both the switch and the frequency generator.

Stroboscopic device

The vertical movement of a phonograph pick-up arm is controlled magnetically or electro-magnetically by means including a body of magnetic material attached to the arm and magnetic field producing means arranged to exert a force on the body.

Pivoted arm control arrangements

A combination of a turntable for playing phonograph records, a lid covering the turntable, tone arm for tracking record grooves, and a cleaning element mounted on the lid for movement into contact with a constant annular area on the top side of the record for cleaning. A counterbalance weight controls the pressure of the cleaning element upon the record.

Method and apparatus for use in cleaning a gramophone disc

A phonograph auto-changer center spindle has a sleeve of flexible material in which bulges can be produced to prevent a disc record from dropping on to a turntable, the bulges being reduced in size or moved in position along the sleeve to control the movement of a disc record on the spindle.

Phonograph auto-changer center spindle

The presence and size of a recorded disc on a turntable is detected and indicated by the interruption of a beam or beams of energy which passes in the plane of the disc, through a hole or holes in a turntable, or beneath the turntable.

Growing community of inventors

Fulbourn, United Kingdom

Keith Douglas Ridler