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RCA built delta CRT's // to in lines. One delta was a very boxy 19",
the other was in 19" & 25". Last deltas & last modular chassii from RCA
with a very short run, they were rare.
Zenith S3 CRT's were in line EFL jugs that had 3 focus grids. Probably
the brightest CRT out there. A few of them could light up Fenway Park
for a night game ! EFL's came out in H-line high end 17" & 19" sets.
Eventually they came in 13, 17, 19, 23, & 25 inch. The H & J used
a modded CC2 chassis.
Zeno
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