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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 and more sensitive than the octal 6V6 that was widely used around the world until the 1960s. An interchangeable North American type is the 6BQ5 (the RETMA tube designation name for the EL84).
The 6550 is a beam power tube designed by Tung-Sol for application as an audio frequency power amplifier and introduced in 1954. [ 136 ] [ 137 ] Tung-Sol literature refers to the 6550 variously as a beam power amplifier, power pentode and beam pentode, with the latter two names viewing the beam confining structure as a fifth electrode.
The 6AQ5 [1] (Mullard–Philips tube designation EL90) is a miniature 7-pin (B7G) audio power output pentode vacuum tube with ratings virtually identical to the 6V6 at 250 V. [2] It was commonly used as an output audio amplifier in tube TVs and radios. It was also used in transmitter circuits. [3]
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Most of its products are audio receiving tubes, mainly used for guitar and hi-fi amplifiers. In technical terms, JJ produces triodes, beam tetrodes and power pentodes. Double diode vacuum tubes for full-wave AC-to-DC rectifiers are also produced. JJ also produces electrolytic capacitors for higher-voltage purposes, generally for use in audio ...
Kustom 200 B-4 amplifier in black Naugahyde, purchased new in 1972. Kustom 200 Bass Amplifier, 100 watts RMS, two 15" speakers, cascade sparkle, 1971. Kustom Amplification or Kustom Electronics is a manufacturer of guitar and bass amplifiers and PA equipment and accessories.