Electric discharge tube, comprising a highly loaded anode

Abstract

An electronic tube comprises a anode assembled of two inner anode members and an outer anode member. Surface portions of the inner member which are placed against corresponding surface portions of the outer member have a coefficient of thermal radiation of more than 60% of that of the .[.outer member.]. .Iadd.black body .Iaddend.for a temperature of about 500° C.

What is claimed is: 
     
       1. An electronic tube comprising an anode assembled of at least one inner anode member exposed to a higher thermal load and an outer anode member exposed to a lower thermal load, said inner anode member having surface portions placed against corresponding surface portions of said outer anode member and, at a temperature of about 500 degrees centigrade, said surface portions of the inner anode member having a coefficient of thermal radiation which .[.exceeds the coefficient of the facing surfaces of the outer anode member by.]. .Iadd.is .Iaddend.at least 60 percent .Iadd.of that of a black body..Iaddend. .[. 
     
     
       2.  An electronic tube as claimed in claim 1, characterized in that the parts of the inner anode member are covered at the surface with a sintered nickel layer and the parts of the outer anode member include iron which is covered with an aluminum layer..]. 
     
     
       3. An electronic tube as claimed in claim .[.2, characterized in that.]. .Iadd.5, wherein .Iaddend.the inner anode member includes nickel-plated iron which is covered with the sintered nickel layer. .Iadd. 
     
     
       4.  An electronic tube comprising a central cathode, a composite anode surrounding said cathode and being assembled of an outer anode member formed by two parts each having two connection flanges, a Y-shaped inner anode member having two wings directed against said cathode and a leg inserted between and attached to the opposite connection flanges of said outer anode member, said inner anode member being exposed to a higher thermal load than said outer anode member and, at a temperature of about 500 degrees centigrade, the contact surfaces of said connection flanges having a coefficient of thermal radiation of more than 60% of that of a black body. .Iaddend. .Iadd. 
     
     
       5.  An electronic tube comprising an anode assembled of an outer anode member and at least one inner anode member exposed to a higher thermal load than said outer anode member, said outer anode member being of iron covered with an aluminum layer, said inner anode member being covered with a sintered nickel layer and having surface portions placed against corresponding surface portions of said outer anode member and, at a temperature of about 500 degrees centigrade, said surface portions of the inner anode member having a coefficient of thermal radiation which is at least 60 percent of that of a black body. .Iaddend.