This paper reports recent progress in the operation of a novel field emission array (FEA) gyrotron cathode. This work has involved the design, development and subsequent operation of an FEA gyrotron cathode, utilising GEC-Marconi Ltd silicon FEAs. Initial experiments have shown this to be a low power, Ã¢â‚¬â€ lkW mm-wave output, long pulse, > ls, system. There are several advantages of using FEAs as an electron beam source in gyrotrons including increased beam quality, low velocity spread and a well-defined and controllable spatial beam distribution. Further advantages lie in the ability to operate FEAs gated, long pulse or DC. Treating the FEA electrodes as a simple RC network predicts possible gating frequencies > 1MHz. Previous cold cathode gyrotrons at Strathclyde have been operated at full power (' 6MW mm-wave output) at a repetition frequency of 330Hz that was limited by the power supply. Utilising FEAs promises ultimate repetition frequencies three orders of magnitude beyond this, as the gating frequency is not related to the switching speed of the HT power supply.