Another discussion about the bright switch got me thinking about if Leo added the bright switch to the Blackface series amps due to some natural hearing loss (he would have been 54 at the time) or even maybe some internal conflicts as to which tone sounded better to players when designing the amps? The more I thought about it, the more I started to wonder why the Champ, Princeton, and Deluxe didn't have a bright switch when all the other Blackface amps did in '63? The circuits weren't that different, so why did some and not others? Was it simply because the trio (Champ, Princeton, Deluxe) were the lower powered end of the line-up (I don't know why it would have mattered for anything except maybe the Champ as it was student amp). Anyone know the answer? It is going to keep up tonight trying to understand why?