La valvula que ayuda a ganar la 2º Guerra Mundial

[Patman]

Este articulo lo encontre hoy, y si bien esta en ingles, es interesante.

The EF50, the Tube that helped to Win the War

Introduction
The glass and radio valve factory of Philips in Eindhoven was the scene of unusual tension and activity in the evening of the 9th of May 1940. The Germans had been building up an enormous armed force near the Dutch-German border, and people anticipated the invasion of the German army into Holland any moment. This threat was in itself enough to give the nice spring evening an almost unreal and un-earthy atmosphere. On top of that, for the past two months the factory had been working frantically to produce an enormous amount of radio valve components for an unknown customer with an unknown application. Copies of special machines to make these components had been hurriedly put together and all these components and machines were now loaded in a truck that that same evening left for the Dutch coast with England as destination. When the truck left the gate of the Philips plant nobody knew that hours later, at 5:30 the Germans would indeed invade Holland. Certainly nobody of those workers, who as the sun set waved the truck good-by, could have imagined that that truck was actually carrying components which were vital to their liberation five years later! As by miracle the truck made it to England although the ferry which carried it was bombarded by German airplanes. These dramatic events marked the start of the life of a radio valve which was destined to play an important role in the outcome of the coming war, the EF50
The EF50 RF penthode constitutes a landmark in the history of the radio tube. Before the EF50, all radio tubes were fabricated using technology which was directly derived from the technology of making light bulbs. The EF50 in contrast had, like all “modern” radio tubes, a base made from pressed glass. This enabled the designers at Philips to combine superior performance with a low-cost high volume production technology in a single tube. Several accounts of the history of the EF50 have been given, both in literature as well as on the Web [1]. On this page I have tried to gather all this information, and to go as much as possible directly to the sources. On this page you will find an account of the history of radar and companies like PYE, Mullard and Philips in as far as it is relevant to the story of the EF50. Using unique Philips sources, special attention will be given to the novel fabrication technologies that were used for the EF50. Finally, and for me personally most interestingly, I have tried as much as possible to reveal the people behind the technology.

SIGUE aqui:
http://www.dos4ever.com/EF50/EF50.html

saludos