A single-ended triode is a vacuum tube electronic amplifier that uses a single triode to produce an output, in contrast to a push–pull amplifier which uses a pair of devices with antiphase inputs to g

The EL84 is a vacuum tube of the power pentode type. It is used in the power-output stages of audio amplifiers, most commonly now in guitar amplifiers, but originally in radios. The EL84 is smaller an