The 80S full wave rectifier is similar to the type 80. The ratings are the same but the 80S has an indirectly heated cathode that is internally tied to one side of the heater. The heather can be clearly seen in the picture. The 80 is by contrast directly heated.
The maximum reservoir capacitor is 32 µF and the minimum series resistance must be 30 Ohms.
Two separate rectifier sections. The central rods provide support and each connects to an anode. At the base the connections are in parallel to the heaters and cathodes.
The small central cathode is surrounded by the wide perforated anode. The large blackened anode is required to dissipate the heat generated by electron bombardment.
The classic envelope is 44 mm in diameter and, excluding the UX4 base pins, is 102 mm tall.
References: Data-sheet, 1040 & 1043. Type 80S was first introduced in 1935. See also1935 adverts.