1. A tube in which current is amplified by the production of secondary electrons that result from the collisions of electrons with special targets inside the tube.
2. An electron-tube structure that produces current amplification.

An electron beam containing the desired signal is reflected from the surfaces of each of a series of dynodes (electrodes whose primary function is the secondary emission of electrons), and at each reflection an impinging electron releases two or more secondary electrons, so that the beam builds up in strength.

3. An instrument used for amplifying a very small current using the effects of secondary emission.

Electrons from the original current strike an anode, producing secondary electrons that are directed to the next anode in a multistage process until the desired level of current is obtained.

A phototube with one or more dynodes (electrodes the primary function of which is secondary emission of electrons) between its photocathode (photosensitive surface that emits electrons when exposed to light or other suitable radiation) and the output electrode.

The electron stream from the photocathode is reflected off each dynode in sequence, with a secondary emission adding electrons to the stream at each reflection.

A section of an electron tube in which an electron current is amplified by one or more successive dynode states.

A dynode is an electrode whose primary function is the secondary emission of electrons which are used in multiplier phototubes and some types of television camera tubes.

An electron tube which includes an electron multiplier.