Junot

occupation:
Manufacturer
Nationality:
European

The predecessor, the Peri tube. Abraham, M. René Jounaust, Michel Peri and Jacques Biguet worked first at Établissements Bocuze for precious metals used in gauze (lamé) but were assigned in about 1914 to Grammont for designing tubes. They ended up in a cylindrical coaxial construction, mounted horizontally and Peri/Biguet applied for a patent on this construction on October 23, 1915, including the 4-Pin-base. Peri/Biguet sold the patent later to Marius Latour who then amassed quite a fortune on royalties on that Peri- Biguet patent. This outraged Peri so much that he spent years trying to design tubes, which would not infringe the Peri-Biguet patent.

Junot-Detecteur and Junot-Amplificateur - It is not known where they were made and by who. Most likely by Michel Peri. But, wholesale dealers sold them all over Europe. In France, by Etablissement G.M.R., 8, Boulevard de Vaugirad, Paris and in Holland by van der Meer & Kars, Koninginnenweg 12, Hilversum (1924). A nickel-plated brass based pip top tube. The Junot-Detecteur has 6 discs with holes punched in the centre stacked one above the other with the unconventional grid and filament passing through the centres. The Junot- Amplificateur has a more conventional design with cylindrical anode. These tubes have an upside down V shaped filament with one top and two bottom connections. One of the bottom connections goes through the ceramic bottom of the base as a loose wire. It was also possible to burn two filaments at the same time, or, as one filament was burned out, to wind the loose wire around the right filament pin and use the other filament.