I have no experience with BAT amps, however I have upgraded many coupling caps in tube amps and preamps.
Vcap or Mundorf Silver/Oil caps will sound much more transparent than BAT's paper-in-oil (PIO) caps.
If you like your amp's tonal balance and transparency, I do not recommend changing the caps.
If you could use more see-through transparency and midrange/treble refinement, Vcaps and Mundorf are excellent choices.
Another option that will not change drastically the tonal balance but will certainly improve refinement and timbre are the new Vcap copper/teflon caps.
i hope this helps
Vcap or Mundorf Silver/Oil caps will sound much more transparent than BAT's paper-in-oil (PIO) caps.
If you like your amp's tonal balance and transparency, I do not recommend changing the caps.
If you could use more see-through transparency and midrange/treble refinement, Vcaps and Mundorf are excellent choices.
Another option that will not change drastically the tonal balance but will certainly improve refinement and timbre are the new Vcap copper/teflon caps.
i hope this helps