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A C1C is a barretter or current stabiliser. The C1C was the Philips C1 fitted with a B4 base.

Barretters were a Continental invention, being used by the Germans to control valve filament currents during WW1.

The pinch and central glass rod support for the filament.

The coiled filament is held within folds of the support struts.

A close-up view of the filament.

The wide glass tube envelope is 37 mm in diameter and, excluding the B4 base pins, is 112 mm tall.

References: Data-sheet Type C1C was first introduced in 1934. See also 1934 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.