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Imagine being a kid in the 80s or 90s at school and hearing the distinctive 20k tone of a CRT Television humming and wondering if you were going to be watching TV in one of your classes that day. It was like a dog whistle for kids.



If you're in the US or anywhere else with NTSC, the horizontal scan rate (and thus the whine of the flyback transformer) is 15.75 kHz :)

525 lines / 2 for interlacing * 60 fields per second = 15750


times 1000/1001 ever since color was introduced, so about 15734 Hz


For me that was a thing until the late 2000's.

They were still using CRT TVs in 2012 when I finished high school. I wouldn't be surprised if there were still plenty of schools with CRT TVs and VCRs for educational material.


I still have a 19" CRT[0] as 2nd monitor at work because... why not?? It still works most of the time and supports a decent resolution (1400x1050 - 1600x1200 flickers). And it's a nice nostalgic conversation piece :)

[0] https://www.cnet.com/products/compaq-s910-crt-monitor-19-ser...




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