Many TV shows from the 80s and 90s were mastered on analog tape (U-Matic or Betacam) with variable quality (250 lines on U-Matic, 350 lines on Betacam SP) but very low by today standards.
Furthermore, these sources are often cropped/zoomed/stretched from 4:3 to 16:9, which lowers quality even more.
Furthermore, these sources are often cropped/zoomed/stretched from 4:3 to 16:9, which lowers quality even more.