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The CRM/71 is a magnetically deflected seven inch television CRT. The deflection angle is about 50 degrees.

This model of tube was used in the Ekco TA201 television of 1939.

The screen diameter is 180 mm and domed. The phosphor will be short persistence white. These phosphors had a blue tint.

The identification label and serial number.

Warning label.

The neck of the tube where the deflection yoke will sit carries the etched identification logo.

The base with only four of the eight possible MO base pins fitted. Within the neck can be seen the electron gun and cylindrical grid.

Looking at the base end of the neck the getter carrier can be seen as can the gun and grid.

This image of the Ekco TA201 television is reproduced courtesy of The National Media Museum.

The end window envelope is 35 mm in diameter, and excluding the base pins is 373 mm tall.

References: Data-sheet & ¹⁰⁴⁰.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.