In common with all 'E' prefix tubes, using the Mullard-Philips tube designation, it has a heater voltage of 6.3V. As the EL84 itself is a 9 pin miniature, it was also cheap to produce and manufacturers were quick to adopt it in general use, and they are found in many old European valve radios. This eliminated the need for one preamplifier triode in radios, making them cheaper to produce. It was developed to eliminate the need for a driver tube in radios, and has rather more gain than is usual in a power pentode, producing full output from a relatively small drive signal. It has a 9 pin miniature base and is found mainly in the final output stages of amplification circuits, most commonly now in guitar amplifiers, but originally in radios and many other devices of the pre-transistor era. The EL84 (European designation - known as the 6BQ5 in North America) is a vacuum tub (a.k.a. Common variants of the EL84, manufactured today in Russia, Slovakia and Yugoslavia.
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