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I would not be too worried...
Zenith and a few others used the 3DG4 as an LV rect in their sets in the'60's but ONLY Zenith used it in a color roundie--AFAIK and ONLY in this chassis. From what I have seen the 3DG4 is not too hard to get. Zenith in particular used it in a LOT of their BW sets till about 64 or so. right now--there are a number of 3DG4 tubes on Ebay, not to too high, either.
I have virtually the same set as you--though mine is a lighter cabinet. Same layout--no remote, and so on. And like yours--it "sorta" works, and my tube is NOT that good. But my set is nearly ALL original and I keep it in my climate--controlled basement. Somewhere this site, are a few pix's from my set, running a few years ago, from A New years celebration and a Def Leppard Laserdisc too. I drove from Cincy to SC to get my 29JC20 at the end of 2002. It was on Phil's radio site for sale then, pretty cheap.
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