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[ChrisW6ATV]

Yes, these devices are generically called "test jigs". I also have a Sylvania Chek-A-Color, model CK3000. They usually include adapter cables to connect to the yoke, CRT, HV, and ground of the chassis, and you plug in an adapter to replace the convergence yoke onto the chassis. One RCA model is the 10J106. The newer RCAs have a 19" CRT, and the Sylvanias have a 13" CRT that I have seen. With the adapters, you can connect any one of these to any brand of color TV chassis. In fact, the RCA and Sylvania jigs use the same adapters (as newer TVs were sold, both companies made new adapters for them, into at least the late 1980's).