The whine is caused by the MCP flexing, but the power doesn‘t cycle between - and +. It is just + and off to the photocathode. The front side of the MCP always has a negative charge, so it attracts when the photocathode is on and relaxes when it‘s off.
As for quality, it is not the Autogated PS that reduces halo, it is the distance between the MCP and photocathode that makes the biggest difference. The closer together they are the less opportunity the electrons have to spread out before they reach the MCP.
As a general rule, you should never turn on a set of NVGs in a lit room, so I‘m in no way advising it. But Pinnacles can do it without light damage because the Autogating PS essentially prevents too many electrons from bombarding the components at once. I‘ve done it several times with no ill effects. High intensity light will still damage them, but normal light levels will not.
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