As in the title - how does a Regulated power supply help improve sounds quality from a pre-amp?
From the link below the 25R shows 2x additional tubes making the total five (my current 25 has just the 3x tubes, two for the phono stage and one for the line stage).
http://www.croftacoustics.co.uk/micro25_R.html
So what's the advantage of a regulated power supply please?