The tube amplifier (bamboo) line is simpler than the transistor machine, easy to make, and has a good music replay effect, especially in terms of emotional expression, so the amplifier is very popular with enthusiasts. The most important feature of the amplifier is the biliary taste. Does the amp that you weld have a warm, mellow, smooth, sweet bile? If not, the sound base is similar to the transistor machine, or harder than the transistor machine. Dry, or homemade bile preamp, buffer access to the playback system, the sound system changes are not as "the immediate" as the media said, you should measure the working point of each tube, Whether to work in the best state, otherwise it will be carefully and carefully adjusted. Only when the various tubes work in the best working condition can the line and the charm of each bile tube be exerted to achieve a satisfactory sound reproduction effect.
In addition to the poor performance of the sound, there is also a phenomenon of light volume and distortion. The sound quality of an amplifier has many factors, but it is ultimately determined by the level of production. When making equipment, enthusiasts generally choose the excellent bile ducts and components according to their hands, and then select the excellent lines or follow the lines of the famous machine to carry out the welding. The specifications and values ​​of the components are not much different from those on the circuit diagram, but because The position of the components, the length of the traces, the quality of the soldering, or other differences, such as the B+ voltage level, etc., will affect the performance of the playback, so the welded amplifier is not necessarily a strong bile of. It doesn't matter if there is no daring. As long as the bile ducts of the amplifiers are working at the best state through proper and reasonable adjustment and verification, the requirements for playback can be achieved.
The content of the amplifier adjustment work, in addition to reducing the noise to an acceptable level and replacing the grade or capacity of the input and output coupling capacitors to change the tone, the most important thing is to adjust the screen pressure, screen flow and grid negative pressure to make the bile duct Working at the right working point makes the sound release system sound good, and this is just a few words in the article or a simple two-character description, or "no adjustment" Can work. If the bile duct does not enter the working state, and then change the brand-name capacitor, the bile will not come out.
When adjusting the amplifier, according to the data provided in the tube manual, as the basis of the circuit, when there is no electron tube manual, the parameter values ​​given in the circuit diagram or the additional bile duct data should be respected. The working point of the triode is determined by the screen voltage and the grid negative pressure. After the screen pressure is determined, the grid negative pressure can be adjusted to adjust the working point. After the screen pressure of the beam tube or the pentode is raised to a certain extent, the screen grid pressure is transformed. It will have a greater impact on the operating point, so the curtain grid pressure and grid negative pressure can be adjusted to select the operating point.
Some methods have been introduced to reduce the noise of the amplifier and replace the coupling capacitor to adjust the tone. This article will not repeat. Here is a discussion on how to adjust the working point of the bile duct.
1. When the gate negative voltage circuit adjusts the operating point of the bile duct, the gate negative voltage is often involved, so first say the gate negative voltage circuit. The electron tube is a voltage control element, and the three main electrodes (filament, gate and screen) are supplied with an appropriate voltage, and the supply of the filament is called a power supply, and the supply of the gate is called a power supply, and the supply of the screen is called an electric power. The gate voltage is generally a negative voltage, which is conventionally referred to as "gate negative voltage" or "gate bias voltage". In order to stabilize the operation of the bile duct, the grid negative pressure must be supplied by direct current. According to the different working categories of the bile duct, there are two methods for supplying the grid negative pressure: one is to use the voltage drop generated by the tube flow (or screen flow + curtain flow) flowing through the cathode resistor to make the grid get a negative pressure. It is called self-contained gate negative voltage, and is generally used in Class A amplification circuits with relatively stable screen current. The other is to set a negative voltage rectification circuit in the power supply part, and supply the grid negative voltage, called fixed gate negative pressure, which is mainly used for Class A and Class B or Class B power amplifier stages with large screen current variation. Using self-contained grid negative pressure, the bile duct is safer. When the fixed grid negative pressure is used, when the negative voltage rectification circuit fails, the bile tube loses the grid negative pressure, the screen will rise too high and burn the bile duct, so there is no self-contained grid. Negative pressure works reliably.
The process of self-supplied gate negative pressure generation is as follows: Figure 1 shows the flow of current in the circuit. When the electron tube works, the screen and the screen grid absorb electrons, and the current flows from the negative electrode of the high voltage of the power supply through the cathode resistance RK, the screen, and the output. The current between the primary coil of the transformer and the screen grid goes to the positive pole of the high voltage to become a load circuit. When current flows through RK, RK generates a voltage drop. The voltage across RK is the negative pole at one end of the ground. One end is positive. The tube amplifier (bamboo) line is simpler than the transistor machine, easy to make, and has a good music replay effect, especially in terms of emotional expression, so the amplifier is very popular with enthusiasts. The most important feature of the amplifier is the biliary taste. Does the amp that you weld have a warm, mellow, smooth, sweet bile? If not, the sound base is similar to the transistor machine, or harder than the transistor machine. Dry, or homemade bile preamp, buffer access to the playback system, the sound system changes are not as "the immediate" as the media said, you should measure the working point of each tube, Whether to work in the best state, otherwise it will be carefully and carefully adjusted. Only when the various tubes work in the best working condition can the line and the charm of each bile tube be exerted to achieve a satisfactory sound reproduction effect.
In addition to the poor performance of the sound, there is also a phenomenon of light volume and distortion. The sound quality of an amplifier has many factors, but it is ultimately determined by the level of production. When making equipment, enthusiasts generally choose the excellent bile ducts and components according to their hands, and then select the excellent lines or follow the lines of the famous machine to carry out the welding. The specifications and values ​​of the components are not much different from those on the circuit diagram, but because The position of the components, the length of the traces, the quality of the soldering, or other differences, such as the B+ voltage level, etc., will affect the performance of the playback, so the welded amplifier is not necessarily a strong bile of. It doesn't matter if there is no daring. As long as the bile ducts of the amplifiers are working at the best state through proper and reasonable adjustment and verification, the requirements for playback can be achieved.
The content of the amplifier adjustment work, in addition to reducing the noise to an acceptable level and replacing the grade or capacity of the input and output coupling capacitors to change the tone, the most important thing is to adjust the screen pressure, screen flow and grid negative pressure to make the bile duct Working at the right working point makes the sound release system sound good, and this is just a few words in the article or a simple two-character description, or "no adjustment" Can work. If the bile duct does not enter the working state, and then change the brand-name capacitor, the bile will not come out.
When adjusting the amplifier, according to the data provided in the tube manual, as the basis of the circuit, when there is no electron tube manual, the parameter values ​​given in the circuit diagram or the additional bile duct data should be respected. The working point of the triode is determined by the screen voltage and the grid negative pressure. After the screen pressure is determined, the grid negative pressure can be adjusted to adjust the working point. After the screen pressure of the beam tube or the pentode is raised to a certain extent, the screen grid pressure is transformed. It will have a greater impact on the operating point, so the curtain grid pressure and grid negative pressure can be adjusted to select the operating point.
Some methods have been introduced to reduce the noise of the amplifier and replace the coupling capacitor to adjust the tone. This article will not repeat. Here is a discussion on how to adjust the working point of the bile duct.
1. When the gate negative voltage circuit adjusts the operating point of the bile duct, the gate negative voltage is often involved, so first say the gate negative voltage circuit. The electron tube is a voltage control element, and the three main electrodes (filament, gate and screen) are supplied with an appropriate voltage, and the supply of the filament is called a power supply, and the supply of the gate is called a power supply, and the supply of the screen is called an electric power. The gate voltage is generally a negative voltage, which is conventionally referred to as "gate negative voltage" or "gate bias voltage". In order to stabilize the operation of the bile duct, the grid negative pressure must be supplied by direct current. According to the different working categories of the bile duct, there are two methods for supplying the grid negative pressure: one is to use the voltage drop generated by the tube flow (or screen flow + curtain flow) flowing through the cathode resistor to make the grid get a negative pressure. It is called self-contained gate negative voltage, and is generally used in Class A amplification circuits with relatively stable screen current. The other is to set a negative voltage rectification circuit in the power supply part, and supply the grid negative voltage, called fixed gate negative pressure, which is mainly used for Class A and Class B or Class B power amplifier stages with large screen current variation. Using self-contained grid negative pressure, the bile duct is safer. When the fixed grid negative pressure is used, when the negative voltage rectification circuit fails, the bile tube loses the grid negative pressure, the screen will rise too high and burn the bile duct, so there is no self-contained grid. Negative pressure works reliably.
The process of self-supplied gate negative pressure generation is as follows: Figure 1 shows the flow of current in the circuit. When the electron tube works, the screen and the screen grid absorb electrons, and the current flows from the negative electrode of the high voltage of the power supply through the cathode resistance RK, the screen, and the output. The current between the primary coil of the transformer and the screen grid goes to the positive pole of the high voltage to become a load circuit. When current flows through RK, RK generates a voltage drop. The voltage across RK is the negative pole at one end of the ground. One end is positive. The tube amplifier (bamboo) line is simpler than the transistor machine, easy to make, and has a good music replay effect, especially in terms of emotional expression, so the amplifier is very popular with enthusiasts. The most important feature of the amplifier is the biliary taste. Does the amp that you weld have a warm, mellow, smooth, sweet bile? If not, the sound base is similar to the transistor machine, or harder than the transistor machine. Dry, or homemade bile preamp, buffer access to the playback system, the sound system changes are not as "the immediate" as the media said, you should measure the working point of each tube, Whether to work in the best state, otherwise it will be carefully and carefully adjusted. Only when the various tubes work in the best working condition can the line and the charm of each bile tube be exerted to achieve a satisfactory sound reproduction effect.
In addition to the poor performance of the sound, there is also a phenomenon of light volume and distortion. The sound quality of an amplifier has many factors, but it is ultimately determined by the level of production. When making equipment, enthusiasts generally choose the excellent bile ducts and components according to their hands, and then select the excellent lines or follow the lines of the famous machine to carry out the welding. The specifications and values ​​of the components are not much different from those on the circuit diagram, but because The position of the components, the length of the traces, the quality of the soldering, or other differences, such as the B+ voltage level, etc., will affect the performance of the playback, so the welded amplifier is not necessarily a strong bile of. It doesn't matter if there is no daring. As long as the bile ducts of the amplifiers are working at the best state through proper and reasonable adjustment and verification, the requirements for playback can be achieved.
The content of the amplifier adjustment work, in addition to reducing the noise to an acceptable level and replacing the grade or capacity of the input and output coupling capacitors to change the tone, the most important thing is to adjust the screen pressure, screen flow and grid negative pressure to make the bile duct Working at the right working point makes the sound release system sound good, and this is just a few words in the article or a simple two-character description, or "no adjustment" Can work. If the bile duct does not enter the working state, and then change the brand-name capacitor, the bile will not come out.
When adjusting the amplifier, according to the data provided in the tube manual, as the basis of the circuit, when there is no electron tube manual, the parameter values ​​given in the circuit diagram or the additional bile duct data should be respected. The working point of the triode is determined by the screen voltage and the grid negative pressure. After the screen pressure is determined, the grid negative pressure can be adjusted to adjust the working point. After the screen pressure of the beam tube or the pentode is raised to a certain extent, the screen grid pressure is transformed. It will have a greater impact on the operating point, so the curtain grid pressure and grid negative pressure can be adjusted to select the operating point.
Some methods have been introduced to reduce the noise of the amplifier and replace the coupling capacitor to adjust the tone. This article will not repeat. Here is a discussion on how to adjust the working point of the bile duct.
1. When the gate negative voltage circuit adjusts the operating point of the bile duct, the gate negative voltage is often involved, so first say the gate negative voltage circuit. The electron tube is a voltage control element, and the three main electrodes (filament, gate and screen) are supplied with an appropriate voltage, and the supply of the filament is called a power supply, and the supply of the gate is called a power supply, and the supply of the screen is called an electric power. The gate voltage is generally a negative voltage, which is conventionally referred to as "gate negative voltage" or "gate bias voltage". In order to stabilize the operation of the bile duct, the grid negative pressure must be supplied by direct current. According to the different working categories of the bile duct, there are two methods for supplying the grid negative pressure: one is to use the voltage drop generated by the tube flow (or screen flow + curtain flow) flowing through the cathode resistor to make the grid get a negative pressure. It is called self-contained gate negative voltage, and is generally used in Class A amplification circuits with relatively stable screen current. The other is to set a negative voltage rectification circuit in the power supply part, and supply the grid negative voltage, called fixed gate negative pressure, which is mainly used for Class A and Class B or Class B power amplifier stages with large screen current variation. Using self-contained grid negative pressure, the bile duct is safer. When the fixed grid negative pressure is used, when the negative voltage rectification circuit fails, the bile tube loses the grid negative pressure, the screen will rise too high and burn the bile duct, so there is no self-contained grid. Negative pressure works reliably.
The process of self-supplied gate negative pressure generation is as follows: Figure 1 shows the flow of current in the circuit. When the electron tube works, the screen and the screen grid absorb electrons, and the current flows from the negative electrode of the high voltage of the power supply through the cathode resistance RK, the screen, and the output. The current between the primary coil of the transformer and the screen grid goes to the positive pole of the high voltage to become a load circuit. When current flows through RK, RK generates a voltage drop. The voltage across RK is the negative pole at one end of the ground. One end is positive.
In addition to the poor performance of the sound, there is also a phenomenon of light volume and distortion. The sound quality of an amplifier has many factors, but it is ultimately determined by the level of production. When making equipment, enthusiasts generally choose the excellent bile ducts and components according to their hands, and then select the excellent lines or follow the lines of the famous machine to carry out the welding. The specifications and values ​​of the components are not much different from those on the circuit diagram, but because The position of the components, the length of the traces, the quality of the soldering, or other differences, such as the B+ voltage level, etc., will affect the performance of the playback, so the welded amplifier is not necessarily a strong bile of. It doesn't matter if there is no daring. As long as the bile ducts of the amplifiers are working at the best state through proper and reasonable adjustment and verification, the requirements for playback can be achieved.
The content of the amplifier adjustment work, in addition to reducing the noise to an acceptable level and replacing the grade or capacity of the input and output coupling capacitors to change the tone, the most important thing is to adjust the screen pressure, screen flow and grid negative pressure to make the bile duct Working at the right working point makes the sound release system sound good, and this is just a few words in the article or a simple two-character description, or "no adjustment" Can work. If the bile duct does not enter the working state, and then change the brand-name capacitor, the bile will not come out.
When adjusting the amplifier, according to the data provided in the tube manual, as the basis of the circuit, when there is no electron tube manual, the parameter values ​​given in the circuit diagram or the additional bile duct data should be respected. The working point of the triode is determined by the screen voltage and the grid negative pressure. After the screen pressure is determined, the grid negative pressure can be adjusted to adjust the working point. After the screen pressure of the beam tube or the pentode is raised to a certain extent, the screen grid pressure is transformed. It will have a greater impact on the operating point, so the curtain grid pressure and grid negative pressure can be adjusted to select the operating point.
Some methods have been introduced to reduce the noise of the amplifier and replace the coupling capacitor to adjust the tone. This article will not repeat. Here is a discussion on how to adjust the working point of the bile duct.
1. When the gate negative voltage circuit adjusts the operating point of the bile duct, the gate negative voltage is often involved, so first say the gate negative voltage circuit. The electron tube is a voltage control element, and the three main electrodes (filament, gate and screen) are supplied with an appropriate voltage, and the supply of the filament is called a power supply, and the supply of the gate is called a power supply, and the supply of the screen is called an electric power. The gate voltage is generally a negative voltage, which is conventionally referred to as "gate negative voltage" or "gate bias voltage". In order to stabilize the operation of the bile duct, the grid negative pressure must be supplied by direct current. According to the different working categories of the bile duct, there are two methods for supplying the grid negative pressure: one is to use the voltage drop generated by the tube flow (or screen flow + curtain flow) flowing through the cathode resistor to make the grid get a negative pressure. It is called self-contained gate negative voltage, and is generally used in Class A amplification circuits with relatively stable screen current. The other is to set a negative voltage rectification circuit in the power supply part, and supply the grid negative voltage, called fixed gate negative pressure, which is mainly used for Class A and Class B or Class B power amplifier stages with large screen current variation. Using self-contained grid negative pressure, the bile duct is safer. When the fixed grid negative pressure is used, when the negative voltage rectification circuit fails, the bile tube loses the grid negative pressure, the screen will rise too high and burn the bile duct, so there is no self-contained grid. Negative pressure works reliably.
The process of self-supplied gate negative pressure generation is as follows: Figure 1 shows the flow of current in the circuit. When the electron tube works, the screen and the screen grid absorb electrons, and the current flows from the negative electrode of the high voltage of the power supply through the cathode resistance RK, the screen, and the output. The current between the primary coil of the transformer and the screen grid goes to the positive pole of the high voltage to become a load circuit. When current flows through RK, RK generates a voltage drop. The voltage across RK is the negative pole at one end of the ground. One end is positive. The tube amplifier (bamboo) line is simpler than the transistor machine, easy to make, and has a good music replay effect, especially in terms of emotional expression, so the amplifier is very popular with enthusiasts. The most important feature of the amplifier is the biliary taste. Does the amp that you weld have a warm, mellow, smooth, sweet bile? If not, the sound base is similar to the transistor machine, or harder than the transistor machine. Dry, or homemade bile preamp, buffer access to the playback system, the sound system changes are not as "the immediate" as the media said, you should measure the working point of each tube, Whether to work in the best state, otherwise it will be carefully and carefully adjusted. Only when the various tubes work in the best working condition can the line and the charm of each bile tube be exerted to achieve a satisfactory sound reproduction effect.
In addition to the poor performance of the sound, there is also a phenomenon of light volume and distortion. The sound quality of an amplifier has many factors, but it is ultimately determined by the level of production. When making equipment, enthusiasts generally choose the excellent bile ducts and components according to their hands, and then select the excellent lines or follow the lines of the famous machine to carry out the welding. The specifications and values ​​of the components are not much different from those on the circuit diagram, but because The position of the components, the length of the traces, the quality of the soldering, or other differences, such as the B+ voltage level, etc., will affect the performance of the playback, so the welded amplifier is not necessarily a strong bile of. It doesn't matter if there is no daring. As long as the bile ducts of the amplifiers are working at the best state through proper and reasonable adjustment and verification, the requirements for playback can be achieved.
The content of the amplifier adjustment work, in addition to reducing the noise to an acceptable level and replacing the grade or capacity of the input and output coupling capacitors to change the tone, the most important thing is to adjust the screen pressure, screen flow and grid negative pressure to make the bile duct Working at the right working point makes the sound release system sound good, and this is just a few words in the article or a simple two-character description, or "no adjustment" Can work. If the bile duct does not enter the working state, and then change the brand-name capacitor, the bile will not come out.
When adjusting the amplifier, according to the data provided in the tube manual, as the basis of the circuit, when there is no electron tube manual, the parameter values ​​given in the circuit diagram or the additional bile duct data should be respected. The working point of the triode is determined by the screen voltage and the grid negative pressure. After the screen pressure is determined, the grid negative pressure can be adjusted to adjust the working point. After the screen pressure of the beam tube or the pentode is raised to a certain extent, the screen grid pressure is transformed. It will have a greater impact on the operating point, so the curtain grid pressure and grid negative pressure can be adjusted to select the operating point.
Some methods have been introduced to reduce the noise of the amplifier and replace the coupling capacitor to adjust the tone. This article will not repeat. Here is a discussion on how to adjust the working point of the bile duct.
1. When the gate negative voltage circuit adjusts the operating point of the bile duct, the gate negative voltage is often involved, so first say the gate negative voltage circuit. The electron tube is a voltage control element, and the three main electrodes (filament, gate and screen) are supplied with an appropriate voltage, and the supply of the filament is called a power supply, and the supply of the gate is called a power supply, and the supply of the screen is called an electric power. The gate voltage is generally a negative voltage, which is conventionally referred to as "gate negative voltage" or "gate bias voltage". In order to stabilize the operation of the bile duct, the grid negative pressure must be supplied by direct current. According to the different working categories of the bile duct, there are two methods for supplying the grid negative pressure: one is to use the voltage drop generated by the tube flow (or screen flow + curtain flow) flowing through the cathode resistor to make the grid get a negative pressure. It is called self-contained gate negative voltage, and is generally used in Class A amplification circuits with relatively stable screen current. The other is to set a negative voltage rectification circuit in the power supply part, and supply the grid negative voltage, called fixed gate negative pressure, which is mainly used for Class A and Class B or Class B power amplifier stages with large screen current variation. Using self-contained grid negative pressure, the bile duct is safer. When the fixed grid negative pressure is used, when the negative voltage rectification circuit fails, the bile tube loses the grid negative pressure, the screen will rise too high and burn the bile duct, so there is no self-contained grid. Negative pressure works reliably.
The process of self-supplied gate negative pressure generation is as follows: Figure 1 shows the flow of current in the circuit. When the electron tube works, the screen and the screen grid absorb electrons, and the current flows from the negative electrode of the high voltage of the power supply through the cathode resistance RK, the screen, and the output. The current between the primary coil of the transformer and the screen grid goes to the positive pole of the high voltage to become a load circuit. When current flows through RK, RK generates a voltage drop. The voltage across RK is the negative pole at one end of the ground. One end is positive. The tube amplifier (bamboo) line is simpler than the transistor machine, easy to make, and has a good music replay effect, especially in terms of emotional expression, so the amplifier is very popular with enthusiasts. The most important feature of the amplifier is the biliary taste. Does the amp that you weld have a warm, mellow, smooth, sweet bile? If not, the sound base is similar to the transistor machine, or harder than the transistor machine. Dry, or homemade bile preamp, buffer access to the playback system, the sound system changes are not as "the immediate" as the media said, you should measure the working point of each tube, Whether to work in the best state, otherwise it will be carefully and carefully adjusted. Only when the various tubes work in the best working condition can the line and the charm of each bile tube be exerted to achieve a satisfactory sound reproduction effect.
In addition to the poor performance of the sound, there is also a phenomenon of light volume and distortion. The sound quality of an amplifier has many factors, but it is ultimately determined by the level of production. When making equipment, enthusiasts generally choose the excellent bile ducts and components according to their hands, and then select the excellent lines or follow the lines of the famous machine to carry out the welding. The specifications and values ​​of the components are not much different from those on the circuit diagram, but because The position of the components, the length of the traces, the quality of the soldering, or other differences, such as the B+ voltage level, etc., will affect the performance of the playback, so the welded amplifier is not necessarily a strong bile of. It doesn't matter if there is no daring. As long as the bile ducts of the amplifiers are working at the best state through proper and reasonable adjustment and verification, the requirements for playback can be achieved.
The content of the amplifier adjustment work, in addition to reducing the noise to an acceptable level and replacing the grade or capacity of the input and output coupling capacitors to change the tone, the most important thing is to adjust the screen pressure, screen flow and grid negative pressure to make the bile duct Working at the right working point makes the sound release system sound good, and this is just a few words in the article or a simple two-character description, or "no adjustment" Can work. If the bile duct does not enter the working state, and then change the brand-name capacitor, the bile will not come out.
When adjusting the amplifier, according to the data provided in the tube manual, as the basis of the circuit, when there is no electron tube manual, the parameter values ​​given in the circuit diagram or the additional bile duct data should be respected. The working point of the triode is determined by the screen voltage and the grid negative pressure. After the screen pressure is determined, the grid negative pressure can be adjusted to adjust the working point. After the screen pressure of the beam tube or the pentode is raised to a certain extent, the screen grid pressure is transformed. It will have a greater impact on the operating point, so the curtain grid pressure and grid negative pressure can be adjusted to select the operating point.
Some methods have been introduced to reduce the noise of the amplifier and replace the coupling capacitor to adjust the tone. This article will not repeat. Here is a discussion on how to adjust the working point of the bile duct.
1. When the gate negative voltage circuit adjusts the operating point of the bile duct, the gate negative voltage is often involved, so first say the gate negative voltage circuit. The electron tube is a voltage control element, and the three main electrodes (filament, gate and screen) are supplied with an appropriate voltage, and the supply of the filament is called a power supply, and the supply of the gate is called a power supply, and the supply of the screen is called an electric power. The gate voltage is generally a negative voltage, which is conventionally referred to as "gate negative voltage" or "gate bias voltage". In order to stabilize the operation of the bile duct, the grid negative pressure must be supplied by direct current. According to the different working categories of the bile duct, there are two methods for supplying the grid negative pressure: one is to use the voltage drop generated by the tube flow (or screen flow + curtain flow) flowing through the cathode resistor to make the grid get a negative pressure. It is called self-contained gate negative voltage, and is generally used in Class A amplification circuits with relatively stable screen current. The other is to set a negative voltage rectification circuit in the power supply part, and supply the grid negative voltage, called fixed gate negative pressure, which is mainly used for Class A and Class B or Class B power amplifier stages with large screen current variation. Using self-contained grid negative pressure, the bile duct is safer. When the fixed grid negative pressure is used, when the negative voltage rectification circuit fails, the bile tube loses the grid negative pressure, the screen will rise too high and burn the bile duct, so there is no self-contained grid. Negative pressure works reliably.
The process of self-supplied gate negative pressure generation is as follows: Figure 1 shows the flow of current in the circuit. When the electron tube works, the screen and the screen grid absorb electrons, and the current flows from the negative electrode of the high voltage of the power supply through the cathode resistance RK, the screen, and the output. The current between the primary coil of the transformer and the screen grid goes to the positive pole of the high voltage to become a load circuit. When current flows through RK, RK generates a voltage drop. The voltage across RK is the negative pole at one end of the ground. One end is positive.
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