That is an amazing mid century range and control panel! And in yellow! Too bad they didn't clean it or describe the working condition at that price... But it is a great design that you rarely find!
This RCA Whirlpool range has nothing to do with Frigidaire. It would have been made in Whirlpool's Hamilton, OH factory between 1955 (when Whirlpool bought the Estate Range Co. from RCA) and 1961 (when the plant closed). Burners probably are T&K or Chromalox.
Tuttle and Kift TK Monotubes They were out several years before Frigidaire Radiantubes came out, Philco, Whirlpool, Kelvinator Admiral Universal and Thermodor and L and H used them, I don't know the back story but Frigidaire probably, and im guessing, either licensed tem or had them built for them ,