re: g-grid circuit options... #1 grid potential
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Hello there,
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I'm working on tetrode and pentode grounded grid circuit
design for an amplifier rebuild project.
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There are grounded grid circuits where the #1 control grid
is tied to the cathode, others where it's removed from
ground and cathode potential and operated with a dc bias,
while the other grids remain grounded. These circuit layouts
are related to the type of tube and the ability of the #1 grid to
deal with excessive dissipation at some drive levels.
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The 4CX250 is one such tube in which text's mention g-grid
operation with the #1 grid at ground is not the best choice.
Excessive grid dissipation at high drive levels might damage
the tube. Other tube types tend to be better suited to all
grids grounded g-grid operation.
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I'd like to know if anyone can provide reference material -
text name sources where I can obtain more detailed
information about the placement of the #1 grid.? Most
of my Handbooks just breeze over the details.
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Please reply direct or through amps to the group.
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cheers
skipp
nospam4me@juno.com
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