240volts and ground hum problems.

[Tony Allgood]

>In the UK, the 3 phase mains is split out into 3 seperate phases at
'substations' which are local to each village/area...
we only get 1 phase... live/neutral/earth.

While this is true in many small villages like mine, most towns share
the phases around each street. My fathers house does indeed have three
phase in his cellar. I believe you can request 3-phase if you want it,
for example if you have a small workshop or like my old next neighbour a
milking parlour. Probably cost a lot, but NORWEB have got to find
another way to increase their profits still further. Most schools have
3-phase as well.

My little studio uses a right hodge podge of balanced, semi-balanced,
ground cancelling and plain single ended paths. But like Martin says,
nothing really beats balanced, electronicaly or otherwise. SSM do nice
ics that have a balanced output, plus see my TB3030's output amp for a
solution using a dual op-amp. No good for big common mode differences,
though, but you shouldn't have these in a home studio. I also have a
rack unit built from wood, no chance of earth loops through the rack
then... very hippy, man.

Regards,

Tony Allgood, Cumbria, UK

Rack mounted moog filter and the TB3030 SuperBassline projects:

http://aupe.phys.andrews.edu/diy_archive/schematics/oakley/