US Patent 7397303 Vacuum tube circuit

Patent 7397303 was granted and assigned to Korg on July, 2008 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Korg

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

73973030

Patent Inventor Names

Fumio Mieda0

Date of Patent

July 8, 2008

Patent Application Number

107002140

Date Filed

November 3, 2003

Patent Primary Examiner

‌

Henry K Choe

Patent abstract

A vacuum tube circuit is capable of amplifying an input signal with use of a low source voltage. Ordinarily, the amount of electrons released from a cathode which is heated by a heater is small since a voltage supplied to the heater is low. In the vacuum tube circuit disclosed here, a positive voltage is supplied to a grid terminal, which more effectively attracts the emitted electrons, thereby increasing the amount of electrons arriving at the plate terminal passing through the grid. As a result, a grid current and a plate current flow in the vacuum tube circuit, which achieves an operation for amplifying an input signal from a signal source.