Which preamp for A50v?

Hi, i'm looking for a preamp for A50v Accuphase,
who has listened to either C275v vs 2400 or old 290v?
Has anybody any experience in matching it with other preamps?
Like A.research, Brystol, Spectral, J.rowland, or Suprateck?

Hi, My personal experience dictates to match accuphase Power with Accuphase Pre. Try one old C280L pre which is very smooth and sounds great (if you can find one! ).