De Forest put a metal grid in the middle of the vacuum tube. By using a small input current to change the voltage on the grid, De Forest could control the flow of a second, more powerful current ...

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 motorized volume control, something ...

Culminating a year-long project, [Usagi Electric] aka [David] has just wrapped up his single-bit vacuum tube computer. It is based on the Motorola MC14500 1-bit industrial controller, but since ...

Starting at $2,995, the Fezz Audio Equinox Vacuum Tube DAC is the most affordable D/A converter with Lampizator technology. The new Fezz Audio Equinox Vacuum Tube DAC ($2,995) is the only Lampizator ...

The C2800 Vacuum Tube Preamplifier features methodically ... In addition, the C2800 remembers tone control circuitry bypass settings for each input. The C55 is packed with functions and can ...