The 21CT55 with a 21FB22A rare-earth CRT is operational and installed in my tiny lab where it will stay as long as I stay. IMHO, it has demonstrated it is capable of displaying a picture that is comparable to a Sony PVM1334 broadcast monitor at normal viewing distance of 3ft to 8ft. The comparisons of Sony vs RCA is presented here:
http://www.picturetrail.com/sfx/album/view/19914223
Like all my projects, work will always be in progress. Right now I am attempting to replace all the generic ferrite cored low SRF video peaking and filtering coils I used to replace the original RCA custom air cored, high SRF, universal wound coils that open circuited. Hopefully this re-coiling will reduce the slight ringing on video transitions and the chroma bleeding into the Y luminance video due to improper demodulator filtering. Click thumbnail to enlarge, than click lower right corner to super enlarge....Tom