I have one I just pulled out the psu and rebuilt it with a modern 100 to 240 or something. The hz I believe is set by the tos.

Been a while don't remember but if you want I can tell you the PSU used, for some reason meanwell comes to mind. 

On May 31, 2026 09:23, John Heritage via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:

Hi folks,

I'm importing an Atari STE from the UK, that requires 240V.  I have a 120V
to 240V transformer, and was wondering if that would work, or would there
be a problem because the UK's grid runs at 50 Hz while the US grid runs at
60 Hz.

I plan to replace the internal power supply with a modern 120V solution,
but wanted to test the STE out of the box before I replaced the PSU.

Thanks!
John