Don't touch that dial.
Old radio and TV announcement to discourage viewers from changing the station and hinting they might miss content.
A style of older television sets that featured control knobs (rotary dials). Began being replaced starting in the 80's with the development of push buttons and digital tuning. Such TVs typically featured two large dials, one for volume control and another for channel. May also feature several smaller dials for fine-tuning, brightness, contrast, and horizontal and vertical hold adjustments.