11-10-2016, 11:11 PM
It is not only valve testers that use AC as HT. My ultrasonic cleaner uses raw AC and it produces bursts of power as if it was a half wave DC unit with no smoothing capacitor.
It just has a single 6DQ6B beam tetrode in an oscillator with a big wave wound coil.
It just has a single 6DQ6B beam tetrode in an oscillator with a big wave wound coil.







