Power regulator? That would imply a constant current source for a set voltage. Why would you need this? Your system only sinks current as needed. Do you mean a power limiter?
The voltage at my house hovers in the 117v range. At nite? close to 118+. The day before our SoCal power outage (somebody in Arizona tripped on our extension cord) I noted voltage closer to 112 or 113. In summer during peak demand, I start shutting stuff off around 115 volts.
Generally unless you have widely fluctuating voltage, you do not need a voltage regulator. Normal voltage ranges of 115 to 125 volts are no big deal. Once you are getting sags down to 110V or overvoltage of 130 volts Then you have a problem
I agree in general with the exception I've personally noticed with my tube integrated. When the ac voltage varies the biasing on the tubes varies in a direct relationship.
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