"Mike Tomlinson" schreef in bericht
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In article , petrus
bitbyter writes

Nevertheless, the heaters cannot be omitted as they provide the
electrons required for the current through the tube.

In other words, used like this, they are not heaters but cathodes.
Presumably this is what a 'cold cathode' tube is.

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Sure. During the classic startup you can consider the heaters to be direct
heated cathodes. Once the light is on they are pretty hot cold cathodes

petrus bitbyter