"Just picking up a brand new phono stage and immediately thinking about replacing the power supply doesn't sound like much fun to me"
Unnecessary implied criticism/negativity. To each his own. If you read my OP, you would have seen that I already have a Simaudio LP5.3. I did not buy the LP3 thinking it would be fantastic or amazing or up to the level of my LP5.3. I bought it because I do need a second phono stage for a second table. I bought it knowing it would not be up to the level of the LP5.3 and when I bought it I discussed with the salesperson (from Music Direct) the potential to upgrade its performance with a replacement for the wall wart. Phono stages by nature "handle" very low voltage signals. The power supply to a phono stage doesn't have to handle big fluctuations in voltage and power draw the way one does in a power amp or even a preamp. But it does need to be ultra quiet. Hence the popularity of battery power supplies with phono stages. A well designed power supply featuring a top quality transformer and chokes will far excel the performance of a switching wall wart for a design like the LP3. I don't think you will find a single audio engineer who would say otherwise. The question is not "should I?" but "which?"-
Unnecessary implied criticism/negativity. To each his own. If you read my OP, you would have seen that I already have a Simaudio LP5.3. I did not buy the LP3 thinking it would be fantastic or amazing or up to the level of my LP5.3. I bought it because I do need a second phono stage for a second table. I bought it knowing it would not be up to the level of the LP5.3 and when I bought it I discussed with the salesperson (from Music Direct) the potential to upgrade its performance with a replacement for the wall wart. Phono stages by nature "handle" very low voltage signals. The power supply to a phono stage doesn't have to handle big fluctuations in voltage and power draw the way one does in a power amp or even a preamp. But it does need to be ultra quiet. Hence the popularity of battery power supplies with phono stages. A well designed power supply featuring a top quality transformer and chokes will far excel the performance of a switching wall wart for a design like the LP3. I don't think you will find a single audio engineer who would say otherwise. The question is not "should I?" but "which?"-