the vacuum tube
A vacuum tube does not contain any gases. All the gases are evacuated from the tube and only vacuum is left.
Vacuum cleaner belts are not repaired, but are replaced.
A vacuum tube is simply a tube with no oxygen nor carbon dioxide in it (aka no air).
Millman's theorem
who made the vacuum tubes
The transistor replaced the vacuum tube, allowing radios to get much smaller and portable.
Kilobytes and vacuum tubes are not in the same category. At best, a twin triode vacuum tube is a single flip-flop and can hold 1 bit of information, making a vacuum tube about 0.000122 of a kilobyte.
an electron tube containing a near-vacuum that allows the free passage of electric current.
Vacuum tube tesla coils operate in a continuous wave mode of operation, continuously providing energy to the tesla coil secondary. As a result, the output is primarily determined by how much power the vacuum tube can process. A vacuum tube Tesla coil does not use a primary spark gap. Before vacuum sealing electronic devices, it is useful to leak check the device. Aside from saving a bit of time finishing off a device that is bound for failure, it lets you know exactly where the problems are, such that they may either be repaired if possible, or otherwise resolved when future devices are made.
cellphone
If your filter is repaired then you can just vacuum the pool.