Being a very happy Sensation M451, thought l wold take a punt on a M901/ JT Dynamic PSU that came up on a well known auction site ( you cannot have enough Sensations or different PSU's for that matter)
however l thought the battery PSU was quite a jump in sound quality compared to the JT, however l learnt that the JT in my system at least has to be powered up permanently, and the sound quality has dramatically improved! The M901 now is SO smooth, warm and full and so, so musical
plus gobs and gobs of power, so l am a happy camper and keep those JT's powered up.