Oo nga ano? Although that may be the reason why a particular vintage piece can sound different from others of the same model, same tubes, & same speakers. Or why the old fenders sound nothing like the RI's. Those leaky caps, the drift in resistor values, old magnets... those are deteriorations that can be good or bad. Only the user knows.
that might be more kasi may difference sa circuitry talaga. or components used. i dont think fender uses the same OTs they used in the 50s and 60s. the Jensen you know today isn't the made the by same Jensen that made them in the 50s and 60s.
may definite differences that is a lot easier to track down than guitar snake oil mojo. that's why well made modern replicas (whether exact or with improvements) cost almost as much as vintage pieces.
upfront's high powered amps though make me daydream sometimes about who played them at which legendary gig.