The CV4007 (commercially the 5726) is a professional double signal diode. These diodes were designed for vision and sound detection. Additionally they are recommended for limiting and DC restoration.
Looking at the specifications, the 5726 is electrically equal to the EB91 with the exception of the maximum permissible PIV. Higher for the EB91.
The two diode sections appear either side of a central electrostatic screen.
One diode seen full face.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 36 mm tall.
References: Data-sheet & 1040. Type CV4007 was first introduced in 1952. See also1952 adverts.
