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why do I have a 220k R over my tube?

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  • #1

    why do I have a 220k R over my tube?

    I'm changing 6v6 tube sockets and notice the original had a 220k from pin 5 to ground. I assume this is a screen grid resistor. The thing is the design I want to do shows instead a 1.5K in series after the coupling cap comming from the PI to pin 5... no ground connectiion shown on schem. Is this an error?
    thanks.

    the finals will be cathode biased.
    Tags: None
  • #2
    opps...now I see the ground connection.
    MY BAD!

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    • #3
      That is not a screen grid resistor, the screen grid is pin 4. Pin 5 is the control grid, which we often just call the grid.
      Education is what you're left with after you have forgotten what you have learned.

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      • #4
        Yep you need that 220k there for grid leak/bias.
        Building a better world (one tube amp at a time)

        "I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo

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