Low Voltage Tube Circuits
OwnerRonald Quaninventor
Life of this patent
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Abstract
A number of low voltage vacuum tube circuits include using supply voltages well below the manufacturer's recommended voltages applied to the plate or screen grid. Some of the tube circuits operate at near zero plate and or screen grid voltages. Other low voltage circuits have forward biasing on one or more grids that are normally biased at a non positive voltage or a grid that is normally connected a cathode. Substantially lower supply voltages allow for example, the filament supply to also supply voltage to the plate and or grid for providing an output signal at a grid and or a plate.
Claims20
A low voltage tube circuit using a vacuum tube comprising:
- the vacuum tube including at least a cathode or heater terminal, a plate terminal, and at least a first grid terminal;
- a plate power supply;
- a load element which includes first and second terminals;
- coupling the cathode of the vacuum tube to ground, AC ground, or a voltage source;
- coupling the first terminal of a load element to the plate of the high voltage conventional vacuum tube;
- coupling a voltage source to the second terminal of the load element;
- coupling a first input signal to the first grid or to the cathode of the vacuum tube;
- wherein an output signal is provided at the plate of the vacuum tube when the plate power supply is provided at zero volt or nearly zero volts with respect to the cathode of the vacuum tube.
A low voltage tube circuit using a conventional high vacuum tube comprising:
- the conventional high voltage vacuum tube including at least a cathode or heater terminal, a plate terminal, and first grid terminal and second grid terminal;
- a plate power supply;
- a load element which includes a first terminal and a second terminal;
- coupling the cathode of the vacuum tube to ground, AC ground, or a voltage source;
- coupling the first terminal of a load element to the plate of the high voltage conventional vacuum tube;
- coupling the plate power supply to the second terminal of the load element;
- coupling a first input signal to the first grid or to the cathode of the vacuum tube;
- coupling a lower than normal direct current voltage to the second grid, wherein lower than normal voltage is below the recommended voltage stated in a data sheet for the conventional high voltage vacuum tube.
A low voltage tube circuit using a conventional high vacuum tube comprising:
- the conventional high voltage vacuum tube comprising at least a cathode or heater terminal, a plate terminal, and first grid terminal and second grid terminal;
- a plate power supply;
- a load element which includes first and second terminals;
- coupling the cathode of the vacuum tube to ground, AC ground, or a voltage source;
- coupling the first terminal of a load element to the plate of the high voltage conventional vacuum tube;
- coupling the plate power supply to the second terminal of the load element;
- coupling a forward or positive bias voltage source to the first grid of the vacuum tube;
- coupling an input signal to the second or to the cathode of the vacuum tube;
- wherein an output signal is provided at the plate of the vacuum tube when the plate power supply is lower than a normal operating voltage and;
- wherein the forward or positive bias voltage to the first grid provides for operating at the lower than normal plate supply voltage which is below the recommended voltage stated in a data sheet for the conventional high voltage vacuum tube.
Dependencies are inferred from the claim text.