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TonyDuell · 19th Aug 2017, 4:04 pm

I'm not sure about this machine, but a lot of switch-mode PSUs do not like being run up on a Variac. Remember a switch-mode PSU approximates a constant power load and will draw more current at a lower input voltage.

19th Aug 2017, 4:04 pm	#10
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: Any Acorn A3000/10/20 Users here? I'm not sure about this machine, but a lot of switch-mode PSUs do not like being run up on a Variac. Remember a switch-mode PSU approximates a constant power load and will draw more current at a lower input voltage.