Auto-gated power supplies the tubes do nothing to enhance the performance of the tube, it simply prevents damage to it by cycle power to the photocathode on and off at a high frequency. This allows the tube to be turned on in normal light conditions without destroying it.
However, since Pinnacle tubes are the only auto-gated tubes available from ITT (commercially available, that is) the tube whine is a good indicator that you have a Pinnacle tube.
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