A cutter unit for carrying a cutter for cutting a phonographic record includes a cutter carrier and a cutter head. The cutter head is carried by the cutter carrier and arranged to be displaced relative to the cutter carrier, in particular to rotate around a cutter pivot, the cutter unit being arranged in a cartridge enclosing and protecting the cutter unit.

A cutter unit for carrying a cutter for cutting a phonographic record includes a cutter carrier and a cutter head. The cutter head is carried by the cutter carrier and arranged to be displaced relative to the cutter carrier, in particular to rotate around a cutter pivot, the cutter unit being arranged in a cartridge enclosing and protecting the cutter unit.

Apparatus, methods, and systems for use in providing tangential (linear) tracking of a stylus on a record during play. In some embodiments, a tonearm assembly includes a tonearm with a laser emission source mounted thereto, and a receiver for receiving a light beam from the laser emission source and for splitting the light beam, and a movement actuator for adjusting a position of the tonearm based on a differential in light intensity between different portions of the split beam.

A thermomechanical memory/logic device is disclosed. In embodiments, the thermomechanical device includes a first thermally controlled terminal (e.g., hot terminal); a second thermally controlled terminal (e.g., cool terminal/base); a stem or other structure that can be thermally expanded connected to the cool terminal; and a thermal conductive head coupled to the stem. The head can exchange heat with the hot terminal. The stem and head are between the first thermally controlled terminal and the second thermally controlled terminal, wherein the stem expands or contracts in response to heat absorbed or given off by the thermal conductive head, causing the head to move towards the first thermally controlled terminal or towards the second thermally controlled terminal until a stable state is reached. For example, bistable thermal states can be used to implement logic states (e.g., ZERO or ONE states).