The 12SF7 is an electrical component known as a vacuum tube, or “valve,” used in the electronics industry. It is a dual triode, composed of two triodes in one device, with each triode sporting its own control grid, heater filament, and anode pin. It stands out because it has a high transconductance, or a low plate resistance, ideal for operating at higher frequencies and allowing for flexibility in operation. The 12SF7 is often used as an active differential amplifier, a voltage amplifier, or a voltage regulator, providing a stabilizing effect when facing small changes in power supply voltage. It can also be used to drive loudspeakers, as well as radios, amplifiers, and other devices.