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38 results about "Tetrode" patented technology

A tetrode is a vacuum tube (called valve in British English) having four active electrodes. The four electrodes in order from the centre are: a thermionic cathode, first and second grids and a plate (called anode in British English). There are several varieties of tetrodes, the most common being the screen-grid tube and the beam tetrode. In screen-grid tubes and beam tetrodes, the first grid is the control grid and the second grid is the screen grid. In other tetrodes one of the grids is a control grid, while the other may have a variety of functions.

Triodes using nanofabric articles and methods of making the same

Vacuum microelectronic devices with carbon nanotube films, layers, ribbons and fabrics are provided. The present invention discloses microelectronic vacuum devices including triode structures that include three-terminals (an emitter, a grid and an anode), and also higher-order devices such as tetrodes and pentodes, all of which use carbon nanotubes to form various components of the devices. In certain embodiments, patterned portions of nanotube fabric may be used as grid / gate components, conductive traces, etc. Nanotube fabrics may be suspended or conformally disposed. In certain embodiments, methods for stiffening a nanotube fabric layer are used. Various methods for applying, selectively removing (e.g. etching), suspending, and stiffening vertically- and horizontally-disposed nanotube fabrics are disclosed, as are CMOS-compatible fabrication methods. In certain embodiments, nanotube fabric triodes provide high-speed, small-scale, low-power devices that can be employed in radiation-intensive applications.
Owner:NANTERO

Low flicker noise active mixer and method thereof

A low flicker noise active mixer comprises a trans-conductance section, a switching quad, and a load section. The trans-conductance section converts a voltage signal pair into a first current signal pair. The switching quad converts the first current signal pair into a second signal pair in a manner controlled by a LO (local oscillator) signal pair. The load section provides a loading to the second current signal pair using a pair of commutative active loads to convert the second current signal pair into an output voltage signal pair.
Owner:REALTEK SEMICON CORP

High Voltage Inverter

Disclosed is a high voltage inverter for converting DC power to AC power with one or more AC output phases. The inverter has for each AC output phase an AC input phase circuit comprising first and second cold cathode field emission controllable electron tubes of triode, tetrode or pentode structure. Each electron tube has a first input node for connection to a high voltage DC potential in excess of 20 KV and a second input node for connection to ground. First electron tube is serially connected between a first end of a primary winding and ground, and second electron tube is serially connected between a second end of the primary winding and ground. Control circuitry controls the electron tubes so that the first and second electron tubes alternatively conduct so as to alternately bring the first and then second end of the primary winding approximately to the potential of ground.
Owner:ADVANCED FUSION SYST LLC

Solid state vacuum devices and method for making the same

A solid state vacuum device (SSVD) and method for making the same. In one embodiment, the SSVD forms a triode device comprising a substrate having a cavity formed therein. The SSVD further comprises an anode positioned in the cavity of the substrate, a cathode suspended over the cavity of the substrate, and a grid positioned between the cathode and anode. In addition, the SSVD comprises a seal for creating a vacuum environment in the area surrounding the grid, cathode, and anode. Upon applying heat to the cathode, electrons are released from the cathode, passed through the grid, and received by the anode. In response to receiving the electrons, the anode produces a current. The current produced by the anode is controlled by a voltage applied to the grid. Other embodiments of the present invention provide diode, tetrode, pentode, and other higher order device configurations.
Owner:INNOSYS

Transimpedance amplifier input stage mixer

A Gilbert cell mixer design is disclosed. Instead of using a differential transconductance stage as typically done, the design employs a differential transimpedance amplifier input stage. By utilizing a transimpedance input stage to the Gilbert mixer, feedback is used to obtain higher linearity without sacrificing noise performance. The transimpedance input stage supplies a current signal to the cascode connected Gilbert switching quad, so the transimpedance amplifier output is taken from the collector of the transimpedance amplifier output transistor, instead of the emitter as normally done with transimpedance amplifiers.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTEGRATION INC

Castellated gate MOSFET tetrode capable of fully-depleted operation

A castellated-gate MOSFET tetrode device capable of fully depleted operation is disclosed. The device includes a semiconductor substrate region having an upper portion with a top surface and a lower portion with a bottom surface. A source region and a drain region are formed in the semiconductor substrate region, with adjoined primary and secondary channel-forming regions also disposed therein between the source and drain regions, thereby forming an integrated cascade structure. Trench isolation insulator islands, having upper and lower surfaces, surround the source and drain regions as well as the channel-forming regions. Both the primary and secondary channel-forming regions include pluralities of thin, spaced, vertically-orientated semiconductor channel elements that span longitudinally along the device between the source and drain regions. First and second gate structures are provided in the form of pluralities of spaced, castellated first and second gate elements interposed between the primary and secondary channel elements, respectively, with first and second top gate members interconnecting the first and second gate elements at their upper vertical ends to cover the primary and secondary channel elements. The adjoined primary and secondary channel elements are super-self-aligned from the first and second gate elements to the source and drain regions. Finally, first and second dielectric layers separate the primary and secondary channel elements from their respective gate structures.
Owner:IP3 2021 SERIES 600 OF ALLIED SECURITY TRUST I

Castellated gate MOSFET tetrode capable of fully-depleted operation

A castellated-gate MOSFET tetrode device capable of fully depleted operation is disclosed. The device includes a semiconductor substrate region having an upper portion with a top surface and a lower portion with a bottom surface. A source region and a drain region are formed in the semiconductor substrate region, with adjoined primary and secondary channel-forming regions also disposed therein between the source and drain regions, thereby forming an integrated cascade structure. Trench isolation insulator islands, having upper and lower surfaces, surround the source and drain regions as well as the channel-forming regions. Both the primary and secondary channel-forming regions include pluralities of thin, spaced, vertically-orientated semiconductor channel elements that span longitudinally along the device between the source and drain regions. First and second gate structures are provided in the form of pluralities of spaced, castellated first and second gate elements interposed between the primary and secondary channel elements, respectively, with first and second top gate members interconnecting the first and second gate elements at their upper vertical ends to cover the primary and secondary channel elements. The adjoined primary and secondary channel elements are super-self-aligned from the first and second gate elements to the source and drain regions. Finally, first and second dielectric layers separate the primary and secondary channel elements from their respective gate structures.
Owner:PALO ALTO NETWORKS INC

Method for analyzing fatty acid chemical composition in cortex periplocae radicis

ActiveCN101498702AComprehensive clarification of medicinal valueElucidate medicinal valueComponent separationChemical compositionFatty acid
The invention provides a method for analyzing chemical components of fatty acid in cortex periplocae radicis. The method includes the following steps: (a) the fatty acid is extracted from the cortex periplocae radicis; (b) methyl ester is performed for the fatty acid; (c) the methyl esterifed fatty acid is detected by a GC-MS combination method, wherein the chromatographic condition for GC-MS combination is as follows: the chromatographic column is a quartz capillary chromatographic column; the carrier gas is a high-purity helium gas; the temperature of an introduction port is 230-270 DEG C; the split ratio is 8:1-12:1; and the flow speed is 0.8-1.2mL.min. The mass spectrum condition is as follows: the ion source is an EI ion source; the temperature of a tetrode is 120-170 DEG C; the temperature of a transmission line is 270-310 DEG C; the voltage of a multiplier tube is 1800-2200V; and the temperature of a GC-MS interface is 210-250 DEG C. Being tested by a methodology, the method is accurate and reliable and can be used for analyzing the chemical components of fatty acid in cortex peripolcae radicis.
Owner:TIANJIN TASLY PHARMA CO LTD

High voltage electron tube inverter with individual output phase current control

Disclosed is a high voltage inverter for converting DC power to AC power with one or more AC output phases. The inverter has for each AC output phase an AC input phase circuit comprising first and second cold cathode field emission controllable electron tubes of triode, tetrode or pentode structure. Each electron tube has a first input node for connection to a high voltage DC potential in excess of 20 KV and a second input node for connection to ground. First electron tube is serially connected between a first end of a primary winding and ground, and second electron tube is serially connected between a second end of the primary winding and ground. Control circuitry controls the electron tubes so that the first and second electron tubes alternatively conduct so as to alternately bring the first and then second end of the primary winding approximately to the potential of ground.
Owner:ADVANCED FUSION SYST LLC

Solid state vacuum devices and method for making the same

A solid-state vacuum device (SSVD) and method for making the same. In one embodiment, the SSVD forms a triode device comprising a substrate having a cavity formed therein. The SSVD further comprises cathode positioned near the opening of the cavity, wherein the cathode spans over the cavity in the form of a bridge that creates an air gap between the cathode and substrate. In addition, the SSVD further comprises an anode and a grid that is positioned between the anode and cathode. Upon applying heat to the cathode, electrons are released from the cathode, passed through the grid, and received by the anode. In response to receiving the electrons, the anode produces a current. The current received by the anode is controlled by a voltage applied to the grid. Other embodiments of the present invention provide diode, tetrode, pentode, and other higher order device configurations.
Owner:HWU RUEY JEN +1

Solid state vacuum devices and method for making the same

A solid-state vacuum device (SSVD) and method for making the same. In one embodiment, the SSVD forms a triode device comprising a substrate having a cavity formed therein. The SSVD further comprises cathode positioned near the opening of the cavity, wherein the cathode spans over the cavity in the form of a bridge that creates an air gap between the cathode and substrate. In addition, the SSVD further comprises an anode and a grid that is positioned between the anode and cathode. Upon applying heat to the cathode, electrons are released from the cathode, passed through the grid, and received by the anode. In response to receiving the electrons, the anode produces a current. The current received by the anode is controlled by a voltage applied to the grid. Other embodiments of the present invention provide diode, tetrode, pentode, and other higher order device configurations.
Owner:INNOSYS

Semiconductor contact tetrode charge number density difference type thermoelectric conversion device

The invention discloses a thermoelectric conversion device which operates by using the charge number density difference between semiconductors of the same type in a semiconductor contact return circuit. The thermoelectric conversion device comprises two N-type semiconductor boards and two P-type semiconductor boards, the right surface of the N-type semiconductor board 1 is in contact with the left surface of the P-type semiconductor board 2, the right surface of the P-type semiconductor board 2 is in contact with the left surface of the N-type semiconductor board 3, and the right surface of the N-type semiconductor board 3 is in contact with the left surface of the P-type semiconductor board 4. A load is applied between the N-type semiconductor board 1 and the N-type semiconductor board 3, or a load is applied between the P-type semiconductor board 2 and the P-type semiconductor board 4. The load contains electric energy output, and thermal energy is converted into electric energy.
Owner:冯建明

Triodes using nanofabric articles and methods of making the same

Vacuum microelectronic devices with carbon nanotube films, layers, ribbons and fabrics are provided. The present invention discloses microelectronic vacuum devices including triode structures that include three-terminals (an emitter, a grid and an anode), and also higher-order devices such as tetrodes and pentodes, all of which use carbon nanotubes to form various components of the devices. In certain embodiments, patterned portions of nanotube fabric may be used as grid / gate components, conductive traces, etc. Nanotube fabrics may be suspended or conformally disposed. In certain embodiments, methods for stiffening a nanotube fabric layer are used. Various methods for applying, selectively removing (e.g. etching), suspending, and stiffening vertically- and horizontally-disposed nanotube fabrics are disclosed, as are CMOS-compatible fabrication methods. In certain embodiments, nanotube fabric triodes provide high-speed, small-scale, low-power devices that can be employed in radiation-intensive applications.
Owner:NANTERO

Electron emission device of high current density and high operational frequency

An electric device operable with a THz-range frequency of the device output is presented. The device comprises a photocathode installed in either one of a diode, triode and tetrode configuration, and is exposed to illumination. In some embodiments of the invention, the device is configured as a diode and photomixing is used for illumination of the photocathode with light in the THz range, the diode converting this input light signal into an electrical output in the THz range, which operates a signal transmitter / receiver. In some other embodiments of the invention, the device is configured as a triode or tetrode, where the electrodes have small dimensions (about 1 micron or less) and are spaced from one another a distance not exceeding 1 micron. The photocathode is kept under certain illumination, and electrical signal applied to one of the electrodes results in the THz output at one of the other electrodes.
Owner:NOVATRANS GRP SA

Reusable light optical fiber electrode as well as making method and embedding method thereof

The invention provides a reusable light optical fiber electrode as well as a making method and an embedding method thereof. A laser diode is connected to one end of an optical fiber; a neural signal connector is welded on a PCB; the neural signal connector is electrically connected to the PCB; the PCB is welded on a micro thruster; an iron sheet is perpendicularly fixed to the micro thruster; a capillary guiding tube is stuck on the iron sheet; a tetrode is inserted into the capillary guiding tube; one end of the tetrode protrudes out of the capillary guiding tube and the other end of the tetrode is inserted into a hole of the PCB; a laser diode-optical fiber complex and tetrode electrodes are cured by virtue of glue; one end of a connecting rod is fixed to the micro thruster; and the other end of the connecting rod is fixed to a laser diode base. The laser diode is drawn and controlled by virtue of an extra-fine electric wire, without inserting or removing an optical fiber or an optical fiber sleeve, so that stable multi-channel recording and synchronous multi-modal photic stimulation control can be conducted on two or more encephalic regions of a freely moving mouse easily. The reusable light optical fiber electrode is small in size, light in weight and reusable, so that using cost can be greatly reduced.
Owner:ARMY MEDICAL UNIV

Transimpedance Amplifier Input Stage Mixer

A Gilbert cell mixer design is disclosed. Instead of using a differential transconductance stage as typically done, the design employs a differential transimpedance amplifier input stage. By utilizing a transimpedance input stage to the Gilbert mixer, feedback is used to obtain higher linearity without sacrificing noise performance. The transimpedance input stage supplies a current signal to the cascode connected Gilbert switching quad, so the transimpedance amplifier output is taken from the collector of the transimpedance amplifier output transistor, instead of the emitter as normally done with transimpedance amplifiers.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC

Continuous microwave curing equipment for vacuum pressure paint impregnation electrical equipment

The invention relates to continuous microwave curing equipment for vacuum pressure paint impregnation electrical equipment, which comprises a conveying rail, bases, microwave curing devices, an online detection device and a PLC (Programmable Logic Controller) control device, wherein the bases can operate along the rail; each microwave curing device is provided with a microwave triode or tetrode; a plurality of bases capable of operating along the rail can be accommodated in each microwave curing device and move in the microwave curing device; the electrical equipment to be subjected to vacuum pressure paint impregnation processing is accommodated in the bases; and the microwave curing devices are connected with vacuumizing equipment. After the curing equipment disclosed by the invention is adopted to carry out curing on the electrical equipment to be subjected to vacuum pressure paint impregnation processing, the curing time can be effectively shortened; and moreover, the continuous microwave curing equipment is beneficial to implementing the automatic control of the curing process and is particularly suitable for the automatic operation.
Owner:张家港市佳龙真空浸漆设备制造厂

Electroluminescent tetrode integrating luminescence, switch and color control, and control method thereof

The invention discloses an electroluminescent tetrode integrating luminescence, switch and color control, and a control method thereof. The electroluminescent tetrode comprises an electrode layer, a luminescent layer and a modulation layer which are arranged in sequence; the luminescent layer comprises at least two luminescent sub-layers; the electrode layer comprises at least two electrodes, and every two adjacent electrodes are arranged at intervals; and the electrodes and the luminescent sub-layers are arranged in a one-to-one correspondence mode, and the modulation layer is used for controlling all the luminescent sub-layers. The luminescent layer is divided into at least two luminescent sub-layers, the electrode layer is divided into at least two electrodes which are arranged at intervals, and the electrodes and the luminescent sub-layers are in one-to-one correspondence, so that the luminescent sub-layers can be respectively controlled through the modulation layer, and the luminescent sub-layers can form a pixel, namely, a control signal is given to the modulation layer; therefore, each luminescent sub-layer can be controlled in an integrated manner.
Owner:PEKING UNIV SHENZHEN GRADUATE SCHOOL

Solid state vacuum devices

A solid-state vacuum device (SSVD) and method for making the same. In one embodiment, the SSVD forms a triode device comprising a substrate having a cavity formed therein. The SSVD further comprises a cathode positioned near the opening of the cavity, wherein the cathode spans over the cavity in the form of a bridge that creates an air gap between the cathode and substrate. In addition, the SSVD further comprises an anode and a grid that is positioned between the anode and cathode. Upon applying heat to the cathode, electrons are released from the cathode, passed through the grid, and received by the anode. In response to receiving the electrons, the anode produces a current. The current received by the anode is controlled by a voltage applied to the grid. Other embodiments of the present invention provide diode, tetrode, pentode, and other higher order device configurations.
Owner:HWU RUEY JEN +1

Automatic impedance-tuning system capable of realizing real-time monitoring and automatic compensation

The invention relates to the technical field of automatic tuning of impedance of wide-band high-power radio-frequency amplifiers, in particular to an automatic impedance-tuning system capable of realizing real-time monitoring and automatic compensation, which can be applied to wide-band high-power source to realize automatic compensation by monitoring the detuning angle of the output impedance of the front amplifier to control and adjust parameters of the matching network so as to overcome the front impedance detuning of tetrodes. The automatic tuning system mainly comprises a control unit and a high-frequency power source which are connected through the impedance and resonance matching network. The automatic impedance-tuning system mainly refers to the automatic-tracking impedance tuning technique; to be specific, according to the technique, the parameters of the matching network can be controlled and adjusted by monitoring the detuning angle of the output impedance of the front amplifier in real time, so that impedance change, caused in the wide band, of the grid capacitor Ckg1 of the tetrode can be compensated automatically, the input impedance of the grid of the tetrode is kept in the resonance matching state within the working range of the whole wide band; therefore, work efficiency and integral performance of the high-power tetrode amplifier can be improved greatly.
Owner:DONGGUAN NEUTRON SCI CENT

Thermionic emission type thermoelectric conversion device of bimetallic single-space tetrode

The invention discloses a thermoelectric conversion device. The thermoelectric conversion device consists of an insulating capacitor and four metal plates, wherein the materials of the metal plate 1 and the metal plate 4 are the same; the materials of the metal plate 2 and the metal plate 5 are the same; the right surface of the metal plate 1 contacts the left surface of the metal plate 2; the left surface of the metal plate 5 contacts the right surface of the metal plate 4; a space 3 is formed between the right surface of the metal plate 2 and the left surface of the metal plate4; and a load is connected to the place between the metal plate 1 and the metal plate 4, or the load is connected to the place between the metal plate 2 and the metal plate 5. When the thermoelectric conversion device is in a high-temperature environment where the metal surface can emit a large amount of thermoelectrons, electric energy is output in the load and then thermal energy is converted into electric energy.
Owner:冯建明

RGB-WW synchronous intelligent melamine lamp

The invention discloses an RGB-WW synchronous intelligent melamine lamp, and relates to the technical field of decorative lighting. Melamine lamp strings are connected to a main line in parallel, eachmelamine lamp string is formed by sequentially connecting a plurality of RGB-WW tetrode bulbs in series, the wire positive electrode of each RGB-WW tetrode bulb is connected with the wire negative electrode of the adjacent RGB-WW tetrode bulb, the RGB-WW tetrode bulbs are sequentially connected in series to form a string, and a voltage drop resistor is connected between the wire positive electrode and the wire negative electrode; and the intelligent power supply is formed by sequentially connecting an IP44 plug, a controller and a power line female terminal through an electric wire, the end part of the melamine lamp string is connected with the controller through the power line female terminal, and the controller is connected to 24-240V voltage through the IP44 plug. Through the control of the intelligent power supply, the intelligent melamine lamp synchronization effect is achieved, the function switching of the remote controller for the intelligent melamine lamp synchronization effect is realized, and the application prospect is wide.
Owner:JIANGSU LEDCO LIGHTING TECH CO. LTD

RGB-WW point control intelligent melamine lamp

The invention discloses an RGB-WW point control intelligent melamine lamp, and relates to the technical field of decorative lighting. The main line positive electrode and the main line negative electrode are connected with a plurality of melamine lamp strings in parallel, each melamine lamp string is formed by sequentially connecting a plurality of RGB-WW lamps in series, the exposed end parts ofthe RGB-WW lamp bottoms form an RGB-WW positive electrode and an RGB-WW negative electrode respectively, each RGB-WW positive electrode is connected with the RGB-WW negative electrode of the adjacentRGB-WW lamp through a wire, the plurality of RGB-WW lamps are connected in series in sequence to form a melamine lamp string; and a four-core chip is arranged in a tetrode of the RGB-WW lamp, and an address written through an encoder is arranged in the four-core chip. According to the invention, the color of the product is input into the MCU through the computer program module, and the color of the product is randomly programmed and modified, so that RGB-WW is controlled to form single-color, double-color and multi-color control functions and the like, the functions are diversified and comprehensive, the operation is simple and convenient, and the application prospect is wide.
Owner:JIANGSU LEDCO LIGHTING TECH CO. LTD

Metal P-type semiconductor junction tetrode type thermoelectric converting, refrigerating and heating device

The invention discloses a metal P-type semiconductor junction tetrode thermoelectric converting, refrigerating and heating device, which is formed by being sequentially and mutually in contact with two metal material plates and two P-type semiconductor plates, wherein the right surface of a metal material plate 1 is in contact with the left surface of a P-type semiconductor plate 2, the right surface of the P-type semiconductor plate 2 is in contact with the left surface of the metal material plate 3, and the right surface of the metal material plate 3 is in contact with the left surface of the P-type semiconductor plate 4. A load is connected between the metal material plate 1 and the metal material plate 3 or between the P-type semiconductor plate 2 and the P-type semiconductor plate 4 so that the thermoelectric conversion can be realized, and a direct current power supply is connected between the metal material plate 1 and the metal material plate 3 or between the P-type semiconductor plate 2 and the P-type semiconductor plate 4 so that the refrigerating and heating operations can be realized.
Owner:冯建明

Method for analyzing fatty acid chemical composition in cortex periplocae radicis

The invention provides a method for analyzing chemical components of fatty acid in cortex periplocae radicis. The method includes the following steps: (a) the fatty acid is extracted from the cortex periplocae radicis; (b) methyl ester is performed for the fatty acid; (c) the methyl esterifed fatty acid is detected by a GC-MS combination method, wherein the chromatographic condition for GC-MS combination is as follows: the chromatographic column is a quartz capillary chromatographic column; the carrier gas is a high-purity helium gas; the temperature of an introduction port is 230-270 DEG C; the split ratio is 8:1-12:1; and the flow speed is 0.8-1.2mL.min<-1>. The mass spectrum condition is as follows: the ion source is an EI ion source; the temperature of a tetrode is 120-170 DEG C; the temperature of a transmission line is 270-310 DEG C; the voltage of a multiplier tube is 1800-2200V; and the temperature of a GC-MS interface is 210-250 DEG C. Being tested by a methodology, the method is accurate and reliable and can be used for analyzing the chemical components of fatty acid in cortex peripolcae radicis.
Owner:TIANJIN TASLY PHARMA CO LTD

Gate resonant part and gate resonant device

The embodiment of the invention discloses a grid resonance component and a grid resonance device. The grid resonance component includes: a housing, a first inductance component, a second inductance component, a third inductance component and a signal input socket, the housing is provided with a first through hole, the first inductance component and the second inductance component are located In the housing, the central axis of the first inductive component, the central axis of the second inductive component and the central axis of the first through hole are parallel to each other, and the first input end and the second input end of the third coil can be input through the signal input socket. The frequency of the signal changes the output current by connecting to an external DC power supply. The technical solution of the embodiment of the present invention controls and changes the output inductance value of the circuit by using a DC bias current coil whose current value of the internal current matches the frequency of the input signal, and realizes fast, real-time and accurate output that can be connected to the grid of the tetrode. The inherent capacitance creates a resonant inductance.
Owner:BEIJING CHANGFENG BROADCASTING COMM EQUIP

Amplifier for exerting negative feedback on electronic tube screen grid

The invention discloses an amplifier which applies a negative feedback on the plate grid of an electronic tube; after a signal is amplified by a quintode or a beam power tetrode, a part is taken out and then a negative feedback signal is applied to the plate grid of the quintode; the quintode of the amplifier provides a negative feedback AC signal for the plate grid by a coupling capacitance / a Zener diode / a negative feedback servo circuit / a negative feedback winding / a connecting plate grid, a DC voltage for the plate grid is provided by a resistance / the Zener diode / the negative feedback servo circuit / a choke / the negative feedback winding / a connecting plate grid. The scheme can also be suitable for the beam power tetrode. The amplifier of the invention can be used for providing an AC negative feedback signal with a fixed amount for the plate grid, improving the linearity of the quintode or the beam power tetrode and being capable of adjusting the negative feedback amount applied on the plate grid no matter applying the quintode at a voltage amplifying stage or a power amplifying stage; the plate grid and an anode can respectively work at the rated operational voltages of each own when the DC voltage of the plate grid is lower than the anode.
Owner:张东静
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