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 an early version with a balloon envelope and it matches the shape of the 1931 advert. Our other PM202 has the classic or shouldered envelope.![](../pics/abu0009a.jpg)
The dome carries the etched identification.![](../pics/abu0009b.jpg)
Although not easy to see the anode box is mounted horizontally.The balloon envelope is 45 mm in diameter and, excluding the B4 base pins, is 89 mm tall.References: Data-sheet, Data, 1040 & 1043. Type PM202 was first introduced in 1931. See also 1931 adverts. |