PS-300 are great on source components, I own two. The have been discussed in other posts on this site. If you really want to drive your power amps I would suggest PS-600. The peak to average power consumption of power amps is very high. If you can't get a meter or scope to be able to measure your peak draw off the power lines look at the fuse rating for a rough approximation of the power requirements for your amp. You DON'T want to skimp on peak current to your power amps.
PS Audio PS-300 one each for mono amps?
I have a pair of Audio Note Ankuros 75W PSE 845 based tube amps. I am using an Aesthetix Io Phono with volume to drive amps. The Amps drive highly modified Wilson Watt3/Puppy2s. I just got great results from adding a VPI SDS to my Basis TT. What experience have you had with PS-300s, and would the sound improvement going to one for each monos amps be worth it. cheers, GerryM5