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The UM80 miniature tuning indicator produces a fan shaped display in green.

Seen sideways the shape of the target can be clearly seen.

The UM80 is for use as a tuning indicator for use in universal voltage (AC/DC) FM or AM receivers with a 100 mA heater chain. The grid voltage range is 13 Volts. Electrically it is similar to other tuning indicators, the valve consists of a triode amplifier that is linked to the indicator device. The control of the image is effected by the triode cathode being connected to the display grid.

The grid voltage change range is 13 V. The EM80 has the same grid voltage range but operates from higher anode voltages and uses less current.

The side window envelope is 19 mm in diameter and, excluding the B9A base pins, is 57 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type UM80 was first introduced in 1954. See also 1954 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.