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.
Claims20
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 drive element which includes first and second terminals;
- coupling the cathode terminal of the vacuum tube to the ground terminal;
- coupling the first terminal of the drive element to the input signal source and coupling the second terminal of the drive element to the plate terminal of the tube;
- coupling a control signal to the first grid terminal of the vacuum tube;
- further comprising that the plate terminal and the grid terminal of the conventional vacuum tube are coupled to a zero volt;
- wherein an output signal is provided at the plate terminal of the 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 around terminal;
- a plate power supply that supplies zero volt or a negative voltage referenced to the ground terminal;
- a load element which includes a first terminal and a second terminal;
- coupling the cathode terminal of the vacuum tube to the ground terminal;
- 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;
- coupling a first input signal to the first grid of the vacuum tube;
- coupling a lower than normal direct current voltage to the second grid, wherein the lower than normal voltage is below the recommended voltage stated in a data sheet for the conventional high voltage vacuum tube;
- further comprising that the plate terminal and the grid terminal of the conventional high voltage vacuum tube are coupled to a zero volt;
- 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 vacuum tube to ground;
- 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;
- further comprising that the plate terminal and the grid terminal of the conventional high voltage vacuum tube are coupled to a zero volt;
- 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 terminal 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.