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Transformers are used to convert between high and low voltages, to change impedance, and to provide electrical isolation between circuits.
This is useful in converting the voltage from a wall outlet, typically 120 or 240 volts, into a higher voltage required by tubes in tube amps .
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Although the envelope was classically glass, power tubes often use ceramic and metal.
In it's simplest form a vacuum tube can be created to operate as a diode: a device that conducts current only in one direction.
A third element called a "control grid" can be added to the design which provides the ability to amplify a signal.
It consists of a minimum of two coils, the primary and the secondary, wound on the same core.
An alternating current in one winding creates a time-varying magnetic flux in the core, which induces a voltage in the other windings.