Motorola roundie

[reeferman]

It has been many decades, and failing memory, but here goes.
In the shop we used to generically use this method. Set must be warm.
Ground the grid of the 3.58 reactance tube. If you get multi-color stripes (a must either way) on a TV picture or low input color bars, adjust reactance coil for single color per vertical bar or the color picture syncs.
If that doesn't work try the same with the 3.58 tube and its output xfmr to the demods.
It's been a long time.
Good luck.