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The BIC/1E is a current stabiliser of Barretter. It will maintain a constant current of 0.98 Amps for a voltage of 3 to 9.5 Volts. It would be used in a series circuit to limit current. The B1C/1E was the prototype for the CV433.

Thanks to Mark Mallison for sending the images.

The thin glass tube envelope is 22 mm in diameter, and including the base caps is 78 mm tall.

Reference: Data-sheet. Type B1C/1E was first introduced in 1949. See also 1949 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.