Vacuum Tube Pre-amplifier Runs Entirely on 3.3V, inclusive of filament voltage

https://www.electronics-lab.com/vacuum-tube-pre-amplifier-runs-entirely-3-3v-inclusive-filament-voltage/

Most vacuum tubes need about 6.3V high supply plus filament voltage to operate. Running at 3.3V inclusively of the filament voltage, the new vacuum tube amplifier from Albert van Dalen has proven it possible to have one with the capacity to operate on an entirely low power supply voltage and still work well. “To be […]