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RE: Class A2 Tube Currents




>>Grid voltage always swings symmetrically around the static DC bias voltage.<<


Your answer lies in this sentence. It's evident from the plate curves of the 211 tube, that the grid lines on either side of the 0V point are fairly symmetrical, so that along a 10K load line going from say -25V --> 0V --> +25V the increase in plate current appears to be fairy linear. The attached graph shows an OP at 60mA and 900V. Of course, at this operating point there will be no swinging past about +35V on the grid - you're already approaching zero volts at the plate.

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