I got it tonight. I'm now a roundie owner

It is a 29JC20 chassis. It does power up but has definite filter issues.I did get enough of a picture to see that the tube is nice and strong.It has an original Zenith 21FB22 picture tube.If it is the original tube the set probably has low hours.The cabinet needs work and I'm missing a knob.It came with the original operating instructions and a copy of the Sams.Looks like I'm in for a recapping.I see lots of bumblebee caps in the pictures of the underneath of the chassis. I think I may have already have the original Zenith service manual also.