1. The 6AU6A is a hardtetrode vacuum tube used in TV vertical oscillator circuits and receiver circuits, typically operating at frequencies between 10 and 25 MHz.
2. It is a miniature type seven-pin glass tube, and operates in a series-string configuration with a maximum anode voltage of 250V.
3. The cathode is heated in order to reduce the occurrences of secondary emission, providing greater linearity and higher fidelity during operation.
4. Its output power is 15.5V at 150 mA.
5. It requires a filament voltage of 6.3 volts at 1.05 Amps to operate efficiently.
6. The tube is designed to reduce radiation and interference, with a shielding factor of 90dB.