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This Cossor directly heated full wave rectifier has lost the Type designation information.

On test the filament takes 2.0 A at 4 Volts.

The coated tape filament is held at the base in folds of the supports.

Here the coating on the filament tape is visible. The two sections are connected in series.

The helical filament tension springs with central hook.

The dome carries the Cossor name.

The classic envelope is 49 mm in diameter and, excluding the B4 base pins, is 117 mm tall.

Reference: Observation.

Pin Connections

Absolute Maximum Operating Conditions^¶