- A vacuum tube, electron tube, thermionic valve (British usage), or tube (North America) is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. It takes the form of an evacuated tubular envelope of glass or sometimes metal containing electrodes connected to external connection pins.
and in their prayers to God for you longe after you for the aboundauut grace of God geven vnto you.
2 Corinthians 9:14 TYN