The PM202 is a battery output triode, described by Mullard as a 'super power' output valve. With an anode load of 4,500 Ohms the valve can deliver 0.3 Watts.
This is of later production as it has the classic or shouldered glass envelope. Our other PM202 is in the original balloon envelope seen in the 1931 advert.
The anode box is much wider than it is deep in keeping with wire filament construction.
Looking down on the valve the twin filament supports of the inverted V oxide coated wire can be seen together with the filament and grid construction.
The classic envelope is 45 mm in diameter and, excluding the B4 base pins, is 87 mm tall.
References: Data-sheet, 1040 & 1043. Type PM202 was first introduced in 1931.