He talks about valve amps using only point to point wiring. Ok, nice high end hand made gear but I doubt you can "hear" a PCB.
This geezer says P2P wiring will always sound better than PCB, but is impractical to impossible in many situations. (@ 4:57)
Speaking purely out of my arse, I would imagine having thicker gauge conductors throughout the circuitry would have an effect.