Sylvania CK3000 Test Rig / Roundie -- Test Setup

[ChrisW6ATV]

As others said, since there is way to send dynamic convergence signals from the specific chassis being tested to the jig, the jig's CRT will have poor convergence everywhere except its center area (which should be able to be adjusted using static convergence components on the back of its CRT).

There could not be a truly "equivalent" rectangular CRT to match the roundies, since round-CRT chassis do not have pincushion adjustments, for example. I would also expect a rectangular CRT's yoke to be different as well, perhaps significantly. If you have access to them, try comparing a CTC-16 schematic to a CTC-17; those are probably pretty close except round vs. rectangular.

Are you missing your yoke programmer and/or convergence load (CVL) devices from your CK-3000? I know the CVL is really just a resistor (as discussed earlier in this topic), but I don't know about the yoke programmers, however, I could try to measure mine to help you make your own replacement.