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What problem in Triode vacuum tubes is solved by the screen grid in Tetrode vacuum tubes?
EcclesJordanTrigger
The screen grid shields the control grid from the plate, reducing capacitance and the Miller Effect, improving performance at high frequencies.
It *also* greatly increases the intrinsic ("natural") gain.
This is the amplification factor, "mu".
A triode has a maximum mu of around 100, and as little as 2.0, depending on the valve type.
A tetrode/pentode has a mu in excess of 500, often in the thousands.
However, you won't usually find a specification for mu in tetrode/pentode data sheets, as it's impractical to design circuits with this amount of gain.
Around 300~350 is the practical maximum.
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoThe suppressor grid reduces secondary emissions from the plate to the screen. Thus eliminating "Tetrode Kink" in the conduction curve at high current.
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