[old_tv_nut]

Judging from the abundant detail (much of which I only knew in general terms), I have to think that the excerpt is accurate, although as I said it does not distinguish between positive and negative guard band tubes in terms of relative transparency. I note the author does discuss negative guard band, but does not say if the later tubes had greater transparency than the figures in the excerpt.

As noted in the articles, the exact numbers varied from manufacturer to manufacturer and over time as innovations improved the performance incrementally. All this disappearing knowledge illustrates why we can't practically build color CRTs any more, just as we can't practically build a Saturn V rocket now that the dedicated factories are gone.