Banpuku,
There is some advantage to keeping the input voltage on tube equipment at or slightly below 120v, as the voltage on the tubes and to some extent their lifetime is proportional to it.
If you use an isolation transformer, many of these have selectable taps on the input side with allow you increase or decrease the output voltage by a few volts. The voltage here at lakeside is consistently 122-124, so I dropped the voltage by 4 volts to account for it.
If you don't use a voltage adjustable transformer, I wouldn't worry, as yours are small variations and they won't cause any harm.
There is some advantage to keeping the input voltage on tube equipment at or slightly below 120v, as the voltage on the tubes and to some extent their lifetime is proportional to it.
If you use an isolation transformer, many of these have selectable taps on the input side with allow you increase or decrease the output voltage by a few volts. The voltage here at lakeside is consistently 122-124, so I dropped the voltage by 4 volts to account for it.
If you don't use a voltage adjustable transformer, I wouldn't worry, as yours are small variations and they won't cause any harm.