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A large number of transmission secondary emission image intensifiers to the basic design, described by Wilcock et al, have now been constructed and the performance data obtained from these tubes is summarised. Based on this information a tube of improved performance has been designed incorporating a larger dynode area and most recently a multialkali photocathode. The preliminary performance data on a number of these tubes with respect to resolution and dark current is reported. The results of measurements of the operational fatigue of this type of tube are also described.