Hello i just have new jrc nrd 545 , is any one know if it is normal to have a bit of hum from the psu ?i did see some web page that say even 2006 have some hum from psu , so i may ask this if it is normal . many thanks . p.s even when it is off , it look like psu till on hi hi hum . vy73 and all the best Elan g0uut