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US 10,216,205 B2Granted
Low voltage tube circuits
OwnerRonald Quaninventor
Life of this patent
Estimating the term…
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.
Claims14
A low voltage tube amplifier circuit using a vacuum tube comprising:
- the vacuum tube including a cathode terminal, a plate terminal, and a first grid including a first grid terminal, wherein the vacuum tube normally operates at a plate voltage of at least +12 volts;
- an input terminal of the low voltage tube amplifier circuit that is coupled to the first grid terminal of the vacuum tube;
- an output terminal of the low voltage tube amplifier circuit that is coupled to the plate terminal of the vacuum tube;
- a plate power supply whose voltage is at zero volt or nearly zero volts with respect to the cathode terminal of the vacuum tube;
- a load element which includes a first terminal and a second terminal;
- coupling the cathode terminal of the vacuum tube to ground;
- coupling the first terminal of the load element to the plate terminal of the vacuum tube;
- coupling the plate power supply to the second terminal of the load element;
- wherein coupling a first input signal to the first grid terminal of the vacuum tube provides an output signal at the plate terminal of the vacuum tube;
- wherein the output signal is provided at the plate terminal of the vacuum tube when the plate power supply is provided at zero volt or nearly zero volts with respect to the cathode terminal of the vacuum tube.
7 more elements
A low voltage tube circuit using a conventional high voltage vacuum tube comprising:
- the conventional high voltage vacuum tube including at least a cathode or heater terminal, a plate terminal, and a first grid terminal G1 and a second grid terminal G2;
- a plate power supply;
- the conventional high voltage vacuum tube normally operates with the plate power supply whose voltage is greater than 100 volts;
- setting the plate power supply voltage to zero volt or near zero volts;
- a load element which includes a first terminal and a second terminal;
- coupling the cathode of the vacuum tube to ground;
- coupling the first terminal of the load element to the plate terminal of the high voltage conventional vacuum tube;
- coupling the plate power supply to the second terminal of the load element;
- further comprising that the low voltage tube circuit includes an input terminal that is coupled to the first grid terminal of the conventional high voltage vacuum tube;
- further comprising that the low voltage tube circuit includes an output terminal that is coupled to the plate terminal of the conventional high voltage vacuum tube;
- coupling a second grid voltage source that includes zero volt or nearly zero volts to the second grid terminal G2;
- wherein coupling a first signal source to the first grid terminal provides an output signal at the output terminal.
9 more elements
A low voltage tube circuit using a vacuum tube comprising:
- the vacuum tube comprising at least a cathode including a cathode terminal, a plate including a plate terminal, a first grid including a first grid terminal and a second grid including a second grid terminal wherein the first grid is closest to the cathode and the second grid is further away from the first grid when the cathode is defined as a center reference;
- a plate power supply that includes a voltage of zero or a voltage of nearly zero volts;
- further comprising a load element which includes a first terminal and a second terminal;
- coupling the cathode terminal of the vacuum tube to a ground terminal;
- coupling the first terminal of the load element to the plate terminal of the vacuum tube;
- coupling the plate power supply to the second terminal of the load element;
- coupling a first positive bias voltage source to the first grid terminal of the vacuum tube;
- wherein an output signal is provided at the plate terminal of the vacuum tube when an input signal is coupled to the second grid terminal.
5 more elements
Dependencies are inferred from the claim text.