a new set: NU 6SN7 GT (with a chipped base) + GE 6080 (not a 5-star and a bit cosmetic-challenged).
remember the mystery black glass RCA? (see above and previous page for pictures). i see two things differernt: this NU has a clear bottom (no chrome coating); the top plate is round. does this mean the mystery black glass RCA is not from NU but Ken-Rad?
hummed about two hours. quiet now. :)