Greetings all, first post here. Yes, mine (a 3kVA job - not RA's but similar specs) hums too, not permanently, but often very noisily, and I've had it now for a couple of years. It doesn't help that it is sited next to the CU on a stud wall, which acts as a kind of resonator! I live in a smallish upper flat in NW1 London, so, not too many options re placement. It's one floor below me, so it doesn't bother me, but it's next to my long suffering wife's study, and she's not over the moon about it.
Anyway, a question. As I understand it, one rule with balanced mains is to plug all your audio kit into it - in my case that includes a pair of Quad ESL57s. This year I intend to get the floor boards up and install a decent ring or radial(s) from the transformer to my listening room. The existing ring attached to the transformer - well, it's a long story - but I don't trust it. That existing ring uses standard 2.5 flat solid core twin and earth. If you were going to do (or get done) a rewire froim the transformer to the audio units, would you do a ring for the whole lot, or radials for each piece of kit? And what cable would you use? I've experimented doing DIY powercords with lengths of affordable audio grade mains cable - e.g. 2.5 Supra Lorad, Lapp Olflex, Foundation from Missing Link and RS screened. All of these, bar the Foundation, are screened, and I like the sound from the unscreened Foundation best. But it's probable it, and the others I have tried, may not comply with current electrcity regs for an underfloor rewire. So, if I want the job certified, it may have to be T&E. So - 6mm, or 10mm?
Any thoughts, experience - most welcome!
Osborn