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Vacuum Tube "grids"

Discussion in 'Electronic Design' started by Jon Slaughter, Oct 22, 2008.

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  1. JosephKK

    JosephKK Guest

    The bottom line is that are not functionally, mechanically, or
    electrically equivalent. They are similar. The control grid has the
    main emitted current control. The other grids are less effective,
    primarily because they have different spacings.

    The screen grid is there to reduce effective interelectrode
    capacitance between the control grid and the plate.

    The suppressor grid is used to reduce secondary electrons from the
    plate from hitting the cathode. Particularly in power tubes.
    Sometimes the suppressor is internally connected to the cathode and
    cannot be repurposed.

    A touch of gedanken should tell you the results of your experiments in
    advance.

    Be careful of using semi-remote cutoff and remote cutoff pentodes as
    triodes, you will get a very different result than you expect.

    Just quit wasting all of our time crying about being told you are not
    doing anything that cannot be figured out from basic principles or
    searched for.
     
  2. JosephKK

    JosephKK Guest

    And it so pretty hard to get good malt vinegar here in the states.
    Maybe via Internet?
     
  3. kevin93

    kevin93 Guest

    ....

    It's when the secondary emission electrons from the anode (plate) get
    back to the SCREEN grid that there are problems as it can cause
    negative resistance and a kink in the transfer response.

    kevin
     
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