Help with tv... mitsubishi from 1986
 

had a question...

Got this old tv, someone told me it was made in 86, model number on the back is ck-3501

there is another number but it is too worn off to read.

the coax input on the back has two places to attach a cable (there is a label that says VHF/75ohm). Above that are four knobs, and I cant see a label for them.

Any idea what these knobs are? why two cable inputs?