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. Also one or more voltage controlled resistors circuits are shown that include near zero plate (e.g., supply) voltage.
Claims21
A tube circuit providing a voltage controlled resistor circuit using a conventional vacuum tube comprising:
- the conventional_vacuum tube including a cathode terminal, a plate terminal, and a first grid terminal;
- a ground terminal;
- an input signal source;
- a resistor which includes first and second terminals;
- coupling the cathode terminal of the vacuum tube to the ground terminal;
- coupling the first terminal of the resistor to the input signal source and coupling the second terminal of the resistor to the plate terminal of the tube circuit;
- coupling a voltage control signal to the first grid of the conventional vacuum tube;
- further comprising that the plate terminal is coupled to zero DC volt;
- wherein an output signal is provided at the plate terminal of the conventional vacuum tube and wherein a voltage controlled resistance is provided at the plate terminal and the ground terminal.
A low voltage tube circuit using a conventional high voltage vacuum tube comprising:
- the conventional high voltage vacuum tube including a cathode terminal, a plate terminal, and first grid terminal and second grid terminal;
- a ground terminal;
- a plate power supply that supplies zero volt or a negative voltage referenced to the ground terminal;
- further comprising that the plate terminal is coupled to the zero volt or the negative voltage from the plate power supply, and wherein the first/second grid terminal is coupled via a resistor to the ground terminal;
- a load element which includes a first terminal and a second terminal;
- coupling the cathode terminal of the conventional high voltage vacuum tube to the ground terminal;
- coupling the first terminal of the load element to the plate terminal of the conventional high voltage vacuum tube;
- coupling the plate power supply to the second terminal of the load element;
- coupling a first input signal to the first grid terminal of the conventional high voltage vacuum tube;
- coupling a lower than normal direct current voltage to the second grid terminal, wherein the lower than normal direct voltage is below a recommended voltage stated in a data sheet for the conventional high voltage vacuum tube;
- providing from the plate terminal an output signal;
- wherein the output signal is related to the first input signal and wherein the output signal is out of phase in relation to the first input signal.
A low voltage tube circuit using a conventional high voltage vacuum tube comprising:
- the conventional high voltage vacuum tube comprising at least a cathode terminal, a plate terminal, and a first grid terminal and a second grid terminal;
- a plate power supply whose voltage is close to zero volts;
- a load element which includes first and second terminals;
- coupling the cathode of the conventional high voltage vacuum tube to ground;
- coupling the first terminal of a load element to the plate of the conventional high voltage 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 terminal of the conventional high voltage vacuum tube;
- coupling an input signal to the second grid terminal or to the cathode of the conventional high voltage vacuum tube;
- further comprising that the plate terminal is coupled to a zero volt and that the second grid terminal is coupled via a resistor to the zero volt;
- wherein an output signal is provided at the plate terminal of the conventional high voltage vacuum tube when the plate power supply is lower than a normal operating voltage;
- and
- wherein the forward or positive bias voltage source to the first grid terminal provides for operating at the lower than normal plate supply voltage which is below a recommended voltage stated in a data sheet for the conventional high voltage vacuum tube.
Dependencies are inferred from the claim text.