Hello, I have a Sony Trinitron XBR KV-36xbr250. I notice the quality on it isn't that good on some channels. I have Comcast 70 channels. My question is, does anybody know if my TV has a HD tuner built in? It was made in Oct 1999. I swear I saw a plug in at the back of the TV that had the HD connection. If it doesn't have a built in tuner, can I buy a tuner if I want to watch like the super bowl in a higher graphic view? Thanks. By the way, I just bought this TV today, it's in great condition. Thanks ahead of time.