Back in the '60's, some Army tank radios had about a dozen push buttons rather than knobs to select a frequency. Rather like your old automobile tube radios, each button was programmed to a given frequency. It was common to hear radio operators talk about what "push" they were on. I am not saying it's the same, just relaying an occurrence I noted.
Does anyone else here remember setting car radio push buttons to your desired frequency? Depending on the radio, my recollection is there were various ways to mechanically set the push button to the desired frequency.
