Okay so I have been doing a lot of research lately in my search to possibly replace one of my three amps. I stumbled across a video of the Chris Stapleton signature reissue 62 Brown face Princeton. Before you jump in me, yes I know they are a different circuit, yes I know that amp is ptp as opposed to pcb or some other style of circuit. My question is this. What is the difference between a brownface vibrato, a Tweed amp with tremolo/vibrato(i think one of the had it), and the blackface tremolo(also labeled vibrato)? Also what are the major differences between the Tweed, brown, blonde, black, and Silver face eras. I honestly have no clue other than that my SRRI is supposedly a blackface circuit translated to pcb. Anyone with knowledge feel.free to chime in.