Long-Life Grid-Controlled Amplifier.
Final rept. 15 May 69-15 May 70,
GENERAL ELECTRIC CO SCHENECTADY NY
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Chemical deposition procedures are used to form the control electrodes and the insulating spacers of an electron tube. A layer of boron nitride insulation is chemically vapor deposited over the surfaces of a thermionic cathode. A metallic layer is deposited over the insulation. A heater pattern is formed in the metallic layer on one side of the cathode disk. A grid pattern is eroded through the metal and insulating layer on the other side. The grid and heater, thus, are in intimate thermal and mechanical relationship with the cathode. The grid-to-cathode spacing of the unit is determined solely by the thickness of the deposited layer of insulation. The heater-cathode-grid unit thus formed is simple and sturdy. It can be inserted in an enclosure, to be evacuated and sealed, to form an electron tube. Different types of enclosures can be used to provide tubes having optimum performance in various applications. Author
- Electrical and Electronic Equipment