The CV1790 is a full wave rectifier on a Loctal base. The commercial equivalent is the 7Z4.

The getter holder is fixed to one anode support rod. The substantial anode support rods are welded to the substantial base pins.

The wide glass tube envelope is 28 mm in diameter, and excluding the B8B base pins is 62 mm tall.

References: Datasheet & ¹⁰⁴⁰. Type CV1790 was first introduced^¶ in 1948.

 
Pin Connections

B8B	1	2	3	4	5	6	7	8
	h	-	a(1)	-	-	a(2)	k	h

 
Absolute Maximum Operating Conditions^¶

Rectifier	Vh	Ah	Va	mAa
	6.3	0.9	450	100

Thanks to Frank Philipse for supplying the above PDF datasheet