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Things like motors in hoovers should be suppressed but often they do seem to dump a bit bit of noise on the mains. I have a record vacuum cleaner that does it. If I'm recording I have to make sure not to use it. I might get round to making a suppressor for it if the lockdown goes on for another month.
Airhead
Further to this issue, I don't think it's actually the stereo itself, unless it's extra sensitive because the pops always happen in relation to other things happening in the house, like when then the furnace or drain pump or fridge start/stop. So basically I think our house is wired badly, or improperly grounded. To be clear, it didn't start after the repair, it just seemed to happen with more regularity and volume. We also switched receivers, with the HK now upstairs and the NAD down in the vault.