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Tempered glass would be preferable. If you find an old coffee table top, you could probably find somebody to cut it to size. I suppose the easiest route would be to get a piece of 3/8" thick plexiglass, or however thick the original glass is. Matter of fact, in lieu of tempered glass, a sheet of thick plexiglass with a sheet of 1/8" regular plate glass in front of it would protect the tube from impacts and protect the plexiglass from getting scratched.
Also I don't think Hoffman Easyvision sets were actually green phosphor. Just yellow safety glass.
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