Zenith Roundie Craigslist Score!

[Electronic M]

As a former owner of that model/chassis here are some tips: The vertical size/lin controls are in the pencil box one is in the hollow shaft of the beige knob left of the green, the other is a hole between knobs.....The fishing lines exiting the yoke are the centering adjustments (don't assume they are garbage and try to rip them out).....On mine most of the tubes in the color section were dead or weak and I could not get any color till I changed them...Test those tubes and replace as needed.

PS the chassis shelf is flimsy; be careful not to rip off the back side of that groove that helps hold the back on.