I’m curious how the fluctuations in my new space affect my mics and if this is something I should consider when setting heater and polarization. Is it a good idea to use a UPS with automatic voltage regulation or is that overkill?
Thank you in advance!
Most people, probably more than 95% don't care at all.
I use my tube mics in a lot of different places so the mains voltage will always be slightly different,
people that work in a lot of different places will have the same situation. I never felt my tube mics to sound different in one place versus the other, neither I ever felt the sound was worse in some places or better in others. So I consider the effects of slightly different mains voltages marginal.
Off course if you will only ever use the Mic in one place, you can easily adjust the PSU for that specific place mains voltage.
Think about guitar players, mostly use tube amps that need Tube Biasing, they set up the Bias as they want in a certain place, but then in every gig they play or any practice room the mains will be different from the place where they setup the Bias to begin with, so the Bias point will be different. No one cares that much, and they sound good in any of those places.
Neumann states the margins of the B+ voltage and Heater voltage of the U67 at + - 2%.
So it means a B+ voltage from 205,8V to 214,2V and a Heater voltage from -6,426V to -6,174V.
Probably it could be even be + an + 5% and you wouldn't be able to tell the difference