TV Control Functions (1975 Quasar)

[idiotbox]

Hello everyone. First post here. Disclaimer: I have very little experience with modern TV's, let alone vintage TV's.

I recently purchased a 1975 Quasar Solid State TV. The sales model number on the back reads XP3163MG. Does anyone know where to find a manual for this model?

Does anyone know what the 2 big knobs on the front do specifically? See:
http://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/ulUAAOSw7PxTzrqp/$_57.JPG

Thanks in advance.