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The key ingredient of real Chromatron is one gun, one cathode, one grid, and dot sequential, which applies to Apple/Indextron too, AND direction to the
vertical stripes not by fine focus and sensing/feedback but active
direction with high RF electric fields at the screen and, produced by grids.
The not really Chromatron KV-7010U has three cathodes and passive (DC)
focus at the screen end by wires. The Trinitron has a much less transparent
mask and no focus, just shadowing, at the screen.
My Indextron is coming back,
I still am looking for a KV7010U.
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