For most of us, vacuum tubes haven’t appeared in any of our schematics or BOMs in — well, ever. Once mass-manufacturing made reliable transistors cheap enough for hobbyists, vacuum tubes ...

This is one of the last frontiers of do-it-yourself that is actually worth doing. Vacuum tubes work by thermionic emission, meaning that electrons are emitted by something really hot under vacuum.

A vacuum tube is just that: a glass tube surrounding ... The Edison effect, incidentally, is the only piece of scientific work Edison ever did. He was not a scientist but an inventor, a tinkerer.

Then there are chapters on photo-electric devices and various special tubes, while the final chapter of sixty pages gives a résumé of high-vacuum practice, based on material supplied by C.

X-ray sources are vacuum tubes that use an electrostatic field to produce X-rays ... Tubes for deep therapy have KVp in the range of 200-300 kV and usually work at 15-20mA. Single focus tubes size ...

The telephone company had problems with vacuum tubes, too, and hoped to find something ... After two years of frustrating but very exciting work, Bardeen and Brattain created an amplifying circuit ...