BL - very clear, transparent. Too much so for my taste. Rather modern sounding. Not at all what I hear in 'vintage' but that is subjective. The SPB -1 sounds like a Pbass to me. I personally run the 250 K pots regardless. I don't care for 'crazy bright'. IMO - that is not where punch lives.
my taste runs to 'round, full, well defined, clear' but no sizzle... just to throw more subjectives out there. like art, I know it when I hear it...
I think I'd know normal if I saw it ... 'Calvin