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Originally Posted by old_tv_nut
IIRC, they were built the opposite of a TV, with the faceplate at ground and the cathode floating at (minus) high voltage...
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Well the filament and the cathode are usually at or near the same potential so there is always the problem of moving a few watts way "uphill" to get that filament to glow.
Did some 1" electrostatic deflection crt work for some military apps, and it was preferred that whatever voltages were used, that the electrostatic deflection plates were closest to ground potential, thus like tek we had -2kv to the cathode, and an isolated filament that we had to pump a couple of watts up to -2kv to light the filament, then we had the anode at +5 kv (tek 4xx is +15kv??).
That's when I started to like magnetic deflection in crt's.
I don't remember how the old eico's etc that I worked with were set up.
I've been "bit" by scopes, lasers and whatnot... (over 30+ years) the most memorable (to others, I don't remember much) was the laser start circuit that arced through a supposed insulator.....