The radio on "The Waltons" is apparently a Zenith 7-S-232 (or 12-S-232) from 1938. The episode I just saw showed the radio, but the tuning eye is missing the button that covers up the center part of the (6T5 according to the source I looked on, though 6U5 and others were common also) tube so you just see the green part. The whole circle is green. Other than artistic license, doe anyone know why they did that?