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https://www.criticalpowersupplies.co.uk/le1200i
I’ve looked into (and tried) voltage stabilisers before and unless you spend a lot, you’re not getting a lot more than a step down as a percentage of wall voltage.
Our local tech experts may beg to differ, but generally +\- 10% is likely good enough
I don't know if the voltage fluctuates though...if it goes into the 250's are we talking significantly higher voltages?
Mesa Boogie for instance make 240v models for the UK and 220V models for Europe (unless I’m mistaken)
Not necessary. Valves (not tubes please!) are very tolerant.
Yes, I change the voltage setting on Fenders to 240 instead of the 230 the come set at, because it's obviously better to have them running at nearer optimum. However, all of the amps that I do that to have been running fine, some of them for many years, without any noticeable issues. Maybe the valves have worn out a bit faster, but it's not clear cut.
Anything within the amp that needs a fixed voltage (e.g. ic's for switching) will have some kind of regulation in the voltage supply, although there are notable exceptions to this and they do cause problems on a few amps that were designed to run at 230, in areas where the wall voltage is 240 or higher.
My wall voltages were often in the 245 area when I was in Derbyshire.
I once had a chat with Pete Cornish where he recommended using a true-online UPS.
he says it’s the only way to make AC30s running at full tilt semi reliable