Radiotechnique (RT) was a French electronics company that made radio transmitting and receiving vacuum tubes, and later more advanced components such as integrated circuits and solar panels.

The company expanded after World War II, moving into television and electronics, including photovoltaics and printed circuits, and in 1979 had about 15,000 employees.

The Compagnie générale de la télégraphie sans fil (CSF) was formed in 1919 as a holding company for the Société française radio-électrique and other subsidiaries in fields related to radio-electricity.

[5] Yves Rocard, a graduate of the Ecole Normale, was recruited in 1928 by Roger Julia, the director of the company, and given the task of producing triodes for the new radio sets.

[7] Although France was not immediately affected by the Great Depression, CSF felt the effect in 1929 since radio transmission was mainly the result of global commercial activity.

[6] The two Radiotechnique factories, making tubes and radio sets, covered a large area on both sides of the Rue Carnot, connected by an underground passage.

[8] At the start of World War II (1939–45) Radiotechnique received important orders for radio equipment from the French Army, and increased its workforce to 1,400.

Given the large British participation, when the Germans occupied Paris they considered Radiotechnique to be spoils of war (Beutelager) and requisitioned the Suresnes factory on 24 June 1940.

The factory was allowed to resume production of equipment for the telephone network and cheap radio receivers, which were popular with the occupying troops.

Officials there heard that the company was looking for a site for a new plant and offered cheap land, help in improving infrastructure and plentiful local labour.

[12] The workers promised by Dreux, displaced from closed facilities of Grosdemouge, Potez, the foundry and Firmin-Didot, were too highly skilled for routine production-line assembly jobs.

[14] In the early 1950s RT was one of three major vertically integrated tube producers in France, the others being Thomson-CSF and the Compagnie Générale d'Electricité (CGE).

[15] In the late 1950s Radiotechnique, Philips and Mullard sold Dario commercial photomultipliers for detection of nuclear radiation, developed by the research arm Laboratoires d'électronique et de physique appliquée [fr] (LEP).

[17] As of 1979 La Radiotechnique was a major manufacturer of electronics equipment, radio receivers and television sets under the "Radiola" and "Philips" brands.

[20] In 1965 all electronic component research, development and production, previously distributed between Coprim and the Radiotechnique "Tubes and Semiconductors" division was grouped into the new subsidiary Radiotechnique-Coprim (RTC).

It made ferrite cores, printed circuits, ceramic dielectric capacitors, memory matrices and wirewound resistors.

In June 1998 Philips Composants, which specialized in manufacture of ceramics products, was sold to the Carbone Lorraine group and took the name Ferroxdure.

[26] On 20 June 2002 the judicial liquidation of the company Actions Simplifiées Aspocomp was announced by the Évreux District Court and all staff were dismissed.