#vacuum tube
- Anticathode — A feminine morphological variant, utilized isolatedly or regionally, for the noun 'anticatod' (anticathode); a massive electrode (anode) placed opposite to the cathode inside a vacuum discharge tube, tasked with receiving the accelerated electron flux to generate X-rays or specific electromagnetic waves.
- Autodyne — A radio receiver circuit or electronic tube in which the same active element (vacuum tube or transistor) simultaneously fulfills the role of a local oscillator and a detector-mixer for high-frequency signals; a regenerative receiver adjusted to the brink of oscillation for receiving continuous waves.