25000-30000 switching on
Probably a mis-spelling of "cathode ray tube".
J.J. Thomson used a cathode ray tube to discover electrons. By passing an electric current through the tube, he observed the deflection of a beam of electrons, which led to his conclusion about the existence of electrons.
1947: Cathode Ray Tube Amusement Device is the earliest known interactive electronic game was created by Thomas T. Goldsmith Jr. and Estle Ray Mann on a cathode ray tube.
A "CRT" is a cathode ray tube. An old style computer monitor (not computer).
because cathode ray tube is the heart of the television.
The cathode ray tube was invented in 1897 by Ferdinand Braun.
The exposure factors control the amount of radiation emitted from the x-ray tube. These factors include tube current (mA), tube voltage (kVp), and exposure time (seconds). Adjusting these parameters can alter the amount of radiation produced in the x-ray tube.
Your Television. You - Your Tube -Television (From Cathode Ray Tube)
None of these appliances use a cathode ray tube. Older type TVs used a cathode ray tube, its common name was the picture tube.
J.J Thomson conducted the cathode-ray tube experiment in 1911.
Cathode ray tube amusement device happened in 1947.
maybe on you tube