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a vacuum-tube

a small vacuum tube

a vacuum tube called pentode

a vacuum tube, called diode

the positive pole of a vacuum tube

a piece of electronic equipment called vacuum tube

a vacuum tube that is used for amplifying electric power, called {beam-power tube}

a valve detector

a tube containing two or more hollow tubes within it

a vacuum tube, called magnetron

a fuse cased in a tube

a vacuum tube used for generating x-rays, called Coolidge tube

a vacuum tube for amplifying microwaves, called traveling wave tube

of a vacuum tube, an attribute of having three terminals

a vacuum tube in which cathode ray are projected on a flourescent screen, called cathode ray tube

a six‐valve set