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The GS10C/S counter indicator is a cold cathode device that is viewed through an end window. The trade name for these counters is Dekatron.

The guide wires allow a bi-directional count at up to 4 kHz.

The glowing orange discharge is passed from cathode to cathode by guide wires and after 10 pulses an output pulse is generated.

The base pins, locating lug and contact spigot. The central base connection is to the common anode.

The base made by McMurdo.

The construction suggests that the base was originally held within a metal skirt.

The central spigot connection.

Rear view showing that each of the connections is numbered.

The end window envelope is 32 mm in diameter and, excluding the special base pins, is 68 mm tall.

References: Data-sheet & ³⁰⁰². Type GS10C was first introduced in 1959. See also 1959 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.