when I was growing up, I think there were maybe 20 Twins games a season that were shown on free TV. at one point, the owners believed that putting games on TV would hurt attendance. as time passed, more games were shown on TV.
from 1961 to 1982, Twins games were shown on WTCN, WCCO or KMSP. can't find details on how many games were shown per season.
as far as I can tell, the first Cable/Pay per view deal for the Twins was Spectrum Sports from 1983 to 1985. Twins Vision existed in 1987 & 1988. then the Midwest Sports Channel from 1989 to 2001. Fox Sports North in '02 & '03. Victory Sports in 2004. Fox Sports North from 2005 to 2020. BSN from 21-23.
during the cable era, there were a limited number of free over-the-air games on KMSP and WCCO, but that ended in (I think) 2005.