The APV4 is the Tungsram implementation of this very common power rating indirectly-heated full wave HT rectifier. Our other APV4 has box anodes.
This type of rectifier was used in larger radios from the mid-1930s and remained in the lists until the 1960s.
The heaters are connected in parallel and one side is fixed to the cathodes. The black pressed sheet anodes have a cylinder formed at one end into which is fed the cathode. The flattened side wings of each anode are connected to two supporting rods.
The front to back dimension of the anodes is 4mm.
The classic envelope is 45 mm in diameter, and excluding the B4 base pins is 101 mm tall.
References: Data-sheet & 1040. Type APV4 was first introduced in 1936.