My Banjo is fair to good quality and strings 1, 2, 3, and 5 all go up 1/2 step per fret as they are supposed to. The 4th string is tuned to D and I tune it quite flat and it doesn't go up 1/2 step, it ...
I have two tenor banjos both tuned in "Chicago tuning", DGBE, that is, like the four highest-pitched strings of the guitar. I am told, and I see from research on Teh Internetz that this is unusual. ...