ID: 
2284
Maker's Name: 
Mullard
Dimensions: 
3.9 × 2.6 × 1.8 cm

This is a PNP Junction Germanium power transistor in a T03 metal package.

It is an example of the first solid-state power transistors, operating at low voltages and high current.

It was advisable not to operate the unit above about 90C case temperature to prevent damage to the Germanium pellet.