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Monochrome cathode-ray tube
The 7JP4 is an early black and white or monochrome cathode-ray tube (also called picture tube and kinescope). It was a popular type used in late 1940s
7JP4
Vacuum tube used to display images
inwards. Similar CRTs were used in video door bells. Radar CRTs such as the 7JP4 had a circular screen and scanned the beam from the center outwards. The
Cathode_ray_tube
Electronic device
diagonal was often used on a radar display. The 7JPx series of CRTs (7JP1, 7JP4 and 7JP7) was originally designed as an A-scope display CRT. A B-scope or
Radar_display
deflection, P1 green, short-persistence phosphor, 7-inch (180 mm) screen. 7JP4 – Monochrome cathode ray tube common in early postwar TV receivers. Electrostatic
List_of_vacuum_tubes
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