Cathode Ray Tubes

This is the grandfather of all CRTs. It is a laboratory model for demonstration purposes. It has no filament and only one pair of deflection plates.

Cathode Ray Tubes can be divided into three main groups:
1. Tubes with electrostatic deflection for use as indicators or in oscilloscopes. This kind of deflection is used to cover a wide frequency range on both X- and Y-axis. The deflection angle must be low in order to keep linearity within useful range.
2. Tubes with magnetic deflection for use in TV-sets, data monitors, radar displays, projection tubes and flying spot scanners. Here the frequency is relatively constant and the deflection angle can be much larger.
3. Tubes that uses a combination of both, so called polar coordinate displays. They were mainly used for radar displays.
The history and the functions of the CRT is well documented in Peter A. Keller's book "The Cathode-Ray Tube" which I strongly recommend for those who want to know almost everything about CRTs. Many thanks to Peter for allowing me to use some of the pictures in the book. Below you will find some unusual CRTs described:
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An amusing CRT
EMI 9788

RCA 7539

Thomson CSF TMA406H


RCA 2F21
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RCA 6499

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Fiber-optic CRT
Tektronix T4601
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 Fiber-optic film recording CRT
Other CRTs with
magnetic deflection
Other CRTs with
static deflection