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RE: 6V6 Amp Feedback

"Is this a grid emission problem?

No, not a problem in the sense that the grid emission is excessive; but a situation that can occur if the tube is used with a grid resistance that exceeds the spec.

"The grid drifts positive when the resistor is too large?"

I would say it this way - "The grid drifts less negative when the resistor is too large." The grid doesn't have to drift all the way to a positive voltage for issues to arise.

Edited to correct wording error...

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