PX25 all the way. The original version of the Audion Silver Night PX25 was what convinced me to move away from 300B amps. I have no experience with 2A3 or 45 amps, but I know that I much prefer the Audion PX25 to my Wavelength Triton 300B amps driving Fab Model 1 speakers (97dB dynamics).
If you have the money down the road, though, consider a Tom Evans Linear A. Check out Jeff Day's review of the amp in the archives at 6moons. He has Duos, and my reaction to the amp on my Fabs was identical to his. This is one insanely good amp for SET lovers.
If you have the money down the road, though, consider a Tom Evans Linear A. Check out Jeff Day's review of the amp in the archives at 6moons. He has Duos, and my reaction to the amp on my Fabs was identical to his. This is one insanely good amp for SET lovers.