+1 on the Astron, picked up a used RS-12M on ebay for $71 incl. shipping for my Brooklyn + DAC. I difference is very noticeable in both my main system on digital and in my small room vinyl system using the very good MC phono section in the Brooklyn +. Stock voltage is 13.8, but I used internal adjustments to recalibrate the front panel meter and reduce the voltage to 13. Clearer and more dynamic. You can also look for model #RS-12A, same thing except no front panel meter. The Astron website lists all their current models plus distributors if you prefer new. Also just ordered a used LS-10A (28 volt) to replace my Dell laptop power supply, curious to see what improvement that makes to my digital system per recommendation on this forum.