- An electron tube which produces an output pulse after counting a specified number of pulses. Also called counting tube (1). When one output occurs for every ten input pulses it is called decade counter tube (1).
- An electron tube with one input electrode and multiple output electrodes, and in which with each successive input pulse the conduction is transferred in sequence to the next output electrode. Also called counting tube (2). When there are ten output electrodes it is called decade counter tube (2).
- An electron tube which registers ionizing radiation, such as alpha rays, and produces an output electric pulse which can be counted. For example, a Geiger-Müller tube. Also called radiation counter tube.
- synonym counting tube
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