d2240r Zenith B&W TV

[Electronic M]

This era of Zenith the yoke back covers are made of an unstable plastic that crystalizes and turns to dust, also the varnish on the windings often was clear instead of the vivid red used later. It's possible that the yoke is still ok.
You can check the yoke by ringing it with an oscilloscope, B&K Analyst, or a dedicated yoke ringing meter.

Sam's probably lists some generic replacements for the yoke in the parts list. Merit, Thordarson/Haldorson, ram, etc... Sometimes those generic subs can still be located if you search the brand and number.