I have the same issues here, with similar voltage. It is not a problem with modern gear, but if it goes up and down during the day like mine, it may throw your bias off a bit on your tube amps if they are manual bias units. I would not suggest using a variac if it is a problem. Most cause sonic degradation or current limiting. Regenerators would be a better answer. It was only an issue for me when I was using a 40 year old tube amp that was designed for 115 volts or below.
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