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The CV74 is a half wave vacuum rectifier on a giant Ediswan screw base. The maximum rectifier current is 80 mA with a maximum anode dissipation of 50 Watts.

The anode cylinder connects to the top pin via a second pinch. The lower pinch is below the metal cap seen near the top of the GES base cap.

The thin glass tube envelope is 51 mm in diameter, and including the base is 230 mm tall.

Reference: Data-sheet.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.