Thanks all for your kind comments. The CRT is a 7ABP7A and the little nixie tube displays the number of satellites visible to the GPS receiver in the master clock wifi sender. I did have the power transformer vacuum impregnated by a transformer shop but to no avail. The noise was minimised by keeping the drive waveform as close to a sine wave as possible and rubber mounting the transformer but at 900 Hz there's obviously some magnetostriction going on that can't be reduced. The noise is picked up by the mechanical structures and putting on the cover makes little difference.
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