Precisely, my model is a SL-1210MK2. After reading an interesting article on diyaudio.com on AC-noise inducted by the internal power-supply, I decided to modify my turntable to include a DC power supply, and so take the original transformer out of the chassis.
Based on the design of the 6L6 user of diyaudio forum, I designed my own PCB.
The result is clearly excellent, the turntable when not playing is “black”, meaning absolutely no noise whatsoever. During playing, the sound is deeper, more present, finer details are revealed.