The CV4044 like its commercial equivalent the M8091, is a high performance single rectifier. These valves are special quality versions of the commercial EY84. With an anode voltage of 625 Volts a full wave rectifier is easier with two valves rather than a pair of valves in a single envelope.
The rated reservoir capacitor is 24 µF and to limit surges the circuit series resistance needs to be at least 250 Ω.
The internal face of the anode is bright nickel sheet.
There are six vertical wings to the anode for significant heat radiation.
The thin glass tube envelope is 21 mm in diameter and excluding the B9A base pins the valve stands 71 mm high.
References: Data-sheet & 1040. Type CV4044 was first introduced in 1960. See also1960 adverts.