Grid electrodes
AssigneeEnglish Electric Valve Company Limited
InventorsDavid Mark Wilcox, William David Richard Rivers
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Abstract
A method of making a pyrolytic graphite grid electrode for a high power transmitting tube includes the steps of holding a metallic grid electrode core between two copper blocks, heating the core to 1750.degree.C by passing an electric current through it and passing a carbonaceous gas over the heated core so that graphite is deposited thereon. Because the graphite thickness is reduced towards the copper blocks supporting the core, where the grid is to be used in a high voltage tube annular shields are provided around the supported ends of the grid.
Claims6
A method of making a pyrolytic graphite grid electrode comprising the steps of holding a metallic grid electrode core between relatively massive bodies which are of good thermal conductivity, passing a carbonaceous gas over said metallic grid electrode core whilst the grid electrode core is held at the temperature required for the deposition of pyrolytic graphite by passing an electric current through it.
Dependencies are inferred from the claim text.