@bonzo75
From a Brit fellow:
In regards to the second question, all components should be connected equal to avoid/minimize current leakage, what may also bring noise. If a component works better inverted I personally consider it poor designed and not use it. Looking on the UK example...
Torus uses Plitron transformers, and Equitech buy from Maryland Transformers. You can simple buy the transformer with the specs you want and have someone to build the entire system for you (safely). You can also buy balanced transformers like the Equitech one from Plitron. It will be certainly...