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Originally Posted by andy
I wonder if any tube company ever did some research on the effect of keeping the heaters lit all the time? With no voltage applied to the tube, it shouldn't be wearing much at all.
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this was found to cause a condition called sleeping sickness.
seems to be a reaction between the cathode and the emissive coating.
caused a high resistance between the cathode and coating.
ibm had trouble with this in the tube computer days iirc.