Well last night I experienced exactly what my original OP had concerns about.
I got set to play vinyl last night but before I had even sat down I could hear a fairly pronounced hum that was not there a couple of days ago.
Now yes I had been around the back fitting a newer Pioneer cdp in the rack so obviously had disturbed the cable runs somewhere. But here is the odd thing I had never paid any careful attention to how I had run cables from the tt to phono to amp previously as it never suffered any hum at all.
To fix though I had to remove tt to phono cables and very carefully reroute away from anything else at all AND add another ground cable from the phono to the amp to clear up the hum.
Now is it possible that the new Pioneer cdp has a noisier power supply or similar?
No idea tbh, just very odd.
But shows that anything can happen in this wonderful hobby of ours!
