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The GR10J (Digitron) is a long life 10 digit display tube.

The ETL logo, Type designation and Made in England.

Side view the outer copper cage is the anode and each digit is formed by a shaped sheet of metal.

Front view showing the stack of cathodes.

20 base pins showing corrosion.

The side window envelope is 28 mm in diameter and, excluding the base pins, is 69 mm tall.

References: Data-sheet.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.