 Reducing the target voltage and increasing the beam current of the pick-up tube helped to mitigate the problem but, with early Plumbicons, this resulted in loss of resolution and increased lag.This problem with Plumbicon tubes was already of concern in the early 1960s and all the early plumbicon cameras suffered from it, including the EMI 2001.With separate mesh tubes there was some improvement, because higher beam currents could be used without loss of resolution.