Grid #1 of a tube needs to be negative when measured from cathode. A cathode resistor is used to generate grid bias for a tube. As the tube draws current there will be voltage dropped across this resistor. Cathode side of resistor will be positive. A grid resistor is connected to the other side of the cathode resistor. This makes the grid negative in relation to cathode.
Norm
:Can you please tell me the function of Grid resistor and cathode resistor please as I am in the learning process of electronics??
::Hi Sathya
::
:: Grid #1 of a tube needs to be negative when measured from cathode. A cathode resistor is used to generate grid bias for a tube. As the tube draws current there will be voltage dropped across this resistor. Cathode side of resistor will be positive. A grid resistor is connected to the other side of the cathode resistor. This makes the grid negative in relation to cathode.
::
::Norm
::
:::Can you please tell me the function of Grid resistor and cathode resistor please as I am in the learning process of electronics??
Grid #1 is negative when measured from cathode. Since most radios don't have negative voltages they use a resistor in series with the cathode. This resistor causes the cathode to be at a positive voltage. Grid #1 will have a resistor connected to chassis, ground. Since cathode is positive the tube will see grid 1 (zero volts) as being negative.
Norm
:Norm: When you say that that grid 1 is negative with respect to the cathode, do you mean that the grid has less negative voltage than the cathode, or do you mean the cathode is at positive voltage and the grid is at negative voltage?
:
:::Hi Sathya
:::
::: Grid #1 of a tube needs to be negative when measured from cathode. A cathode resistor is used to generate grid bias for a tube. As the tube draws current there will be voltage dropped across this resistor. Cathode side of resistor will be positive. A grid resistor is connected to the other side of the cathode resistor. This makes the grid negative in relation to cathode.
:::
:::Norm
:::
::::Can you please tell me the function of Grid resistor and cathode resistor please as I am in the learning process of electronics??
The grid has zero volts through a high value resistor. A signal can still be applied to the grid since it's not connected directly to ground.
Norm
:Thanks, Norm. That helps. There's one more thing you could clarify me on this topic. If I understand you correctly, the cathode has positive voltage and because of the resistor to groundthe tube will see the grid at 0 volts and therefore negative with respect to the cathode. If the grid has zero volts how is it able to provide a signal between the cathode and plate? Thanks.
::Hi Mike
::
:: Grid #1 is negative when measured from cathode. Since most radios don't have negative voltages they use a resistor in series with the cathode. This resistor causes the cathode to be at a positive voltage. Grid #1 will have a resistor connected to chassis, ground. Since cathode is positive the tube will see grid 1 (zero volts) as being negative.
::
::Norm
::
:::Norm: When you say that that grid 1 is negative with respect to the cathode, do you mean that the grid has less negative voltage than the cathode, or do you mean the cathode is at positive voltage and the grid is at negative voltage?
:::
:::::Hi Sathya
:::::
::::: Grid #1 of a tube needs to be negative when measured from cathode. A cathode resistor is used to generate grid bias for a tube. As the tube draws current there will be voltage dropped across this resistor. Cathode side of resistor will be positive. A grid resistor is connected to the other side of the cathode resistor. This makes the grid negative in relation to cathode.
:::::
:::::Norm
:::::
::::::Can you please tell me the function of Grid resistor and cathode resistor please as I am in the learning process of electronics??