Low Cost AC Regenerator

I just connected an imported lowish cost step down conditioning transformer that takes my 240V (nominal, sometimes higher) supply and outputs to 230V and to 220V outputs.

This followed two boxes needing repair, supposedly due to overvoltge. I would otherwise have stayed with a 'normal' power conditioner. My components have 220 on the back of some, 230 on the others. 

It's sounding good so far, but it's  barely had time to warm up yet.

@carlsbad2 . Yes,  I did feel that there were improvements on my first (and only) listen and I had a happy grin, but my system has changed a bit over a short period with boxes and cables, making real comparisons and unbiased judgements a bit tricky.

Note that the two boxes that died have 220V written on the back and I was feeding them 238 - 244, so more than 10% over. I also noted that one of them, a C/J 350 power amp, is now running 20+ degC cooler than it was before the step down/voltage regulator was installed (i.e. thermometer reading over the cooling fins).

I wouldn't completely rule out bigger power spikes as being part, or all of the cause, but adjusting the voltage, still seemed like a prudent thing to do. Otherwise, I would probably have gone for something like a Puritan Audio PSM 156 SE, which people are saying good things about elsewhere.