Radio Amateur Quiz Canadian License

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Question A-005-003-010

Why is neutralization necessary for some vacuum-tube amplifiers?

Correct Answer

To cancel oscillation caused by the effects of interelectrode capacitance

Explanation

In vacuum tubes, especially triodes at high frequencies, the capacitance between the plate and grid (Cgp) can provide a path for positive feedback, leading to oscillations. Neutralization counteracts this.

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