differences btw blackface and mid 70s princeton reverb

[oildrops]

could anyone tell me the tonal difference between a later BF reverb pr and mid 70s pr reverb with non removable baffle, besides cab difference? Someone said less " mojo" but I'm looking for less subjective answers. Lets say they both have the same speaker and caps up to spec. Thanks!

 

[Blue Strat]

Minimal differences at best and it would depend on specific specimens as all amps of the same model can sound slightly different...especially 40-50 years later.

 

[Heady Jam Fan]

I'm not a Princeton expert by any means, but check out Fender Guru, particularly the section near the bottom regarding the comparison between the Blackface and Silverface circuit.
http://fenderguru.com/amps/princeton-reverb

According to Fender Guru, the only difference that should really have any effect are the rectifier tube and the suppression cap on the reverb (makes just the reverb darker, not the dry signal). These are both easy things to play with and see what you prefer.