This was great and super informative. I have a question about that Japanese made voltage regulator thing, the Kiukisui or whatever. They say they are running the amps off of this unit at 236V. So this is like a voltage regulator/attenuator? And I thought they are in the US, so maybe the like the Marshalls set to the UK voltage on the back of the amps and then use the Kuikisui to bump up the US voltage which would be at 120. Anyone that can explain whether I am figuring this wrong,,,it would be appreciated. Maybe they are In the UK. Most Marshalls have a selector that you can select the voltage, whether UK or US, on the back of the amp. I found it very interesting that they are running and setting the amps at UK voltages because they prefer the enhancement in tone it gives. Or maybe I've got it all wrong.