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Looking at the block diagrams of that apple TV set, it seems that the level of complexity (and number of tubes likely needed) would be about the same as needed by convential shadow mask color TV sets. And you just end up trading the convergence problem with "the wrong color because some red signal hits the green or blue stripe" problem. Also you have to keep that 37ish MHz local oscillator and its harmonics out of the TV set's front end (tuner). Ever set a TV set right next to the computer? Shielding can get expensive.
And the risks involved in gearing something new for full production (what will bite us in the ass?) for something not likely to cost any less to manufacture probably made it a non starter.
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