Despite the oldest solid state audio circuitry now qualifying for a pension and a bus pass where this is being written, the thermionic tube retains a foothold in the world of audio — cherished ...

Perhaps nothing added quite so much to the charm of vacuum tube circuits ... fear not — this solid-state replacement for the magic eye tube is ready to stand in for your restoration projects.

The transistor was a solid (thus the term "solid-state technology") but had the electrical properties of a vacuum tube. Yet it had none of the drawbacks: it was cheap, sturdy, used little power ...

Kelly suspected that solid state science might provide a new kind of amplifier to replace the vacuum tube in AT&T's phone system. The tubes amplified voice signals as they traveled through the ...

relied on an array of 163 vacuum tubes to produce sound. Tubes are expensive, power-hungry and unreliable in comparison to solid-state electronics, so their use in synthesizers never quite caught ...