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The CV242 photocell is designed to have an anode voltage of 80 Volts and has a sticker to indicate this.

The cathode is a flat plate that is folded to form a half cylinder. The anode is a vertical rod at the centre of the envelope.

The cathode looks to have seen better days. The top of the anode is connected to one of the cathode supports by a glass tube.

The thin glass tube envelope is 25 mm in diameter, and excluding the B4 base pins is 86 mm tall.

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.