Mullard describe the EZ41 full wave rectifier as being primarily for use in car radio receivers. This exhibit was made in Great Britain and carries the Philips brand. In the UK the Philips factories were Mullard.
In the EZ41 full wave rectifier we see the move from all glass with a base spigot and metal skirt, to a complete all glass design. The pins are still equi-spaced around the pin circle, but the skirt is a thickened region of the envelope and the locating device is a pip moulded into the glass.
The style of sealing the pressed glass foot to the envelope is typical of Philips machinery. and our Mullard EZ41 was probably made on the same production line.
The maximum reservoir capacitor is 50 µF and the device must have a minimum series resistance of 325 Ohms.
The locating pip is required as the B8A base has no gap in the pin circle to indicate orientation. Both anodes are identical with a X cross section and stacked vertically at right angles to one another.
The valve turned a quarter turn.
The thin glass tube envelope is 20 mm in diameter and excluding the B8A base pins, is 54 mm tall.