The EL32 is an octal based audio output pentode. The EL2 is electrically identical but mounted on the Ct8 side contact base that was popular in Europe but regarded as having poor reliability in the UK. Mullard say of this valve that it is a 200 mA heater valve for use in AC/DC sets or for use in car radios. The values given are for single ended use, in push pull a pair can deliver 7 W.
There are two levels of top mica. The upper layer grips the shoulder of the envelope and rectangular one below holds the electrodes in place. Reflection on the glass spoil the view of the heat radiators on the control grid supports but they are visible in the image below.
The maker codes on the glass.
The classic envelope is 35 mm in diameter and, excluding the IO base pins, is 94 mm tall.
References: Data-sheet & 1043. Type EL32 was first introduced in 1940.