The EL84 is an electron tube having Novalsockel ( pressed glass miniature base) and was founded in 1953 primarily developed for the application in audio amplifiers from the Philips Group. In RETMA key typing the U.S. tube industry, it has the name 6BQ5. It will continue to be manufactured in different countries.


The EL84 is a low-frequency pentode that obtained after a single-ended class A amplifier 5.7 watts and a push-pull AB amplifier ( 2 tubes ) 17 Watts output power. The required anode voltage is 250 to 300 volts, the anode current is about 48 mA.

It replaced the 1947 constructed 9 -W output pentode EL41, which could produce less power and yet the thermal and manufacturing technology rather unfavorable Rimlocksockel ( B8A ) had.

The EL84 comes with comparatively small dimensions of: With a height of only 72 mm and a diameter of 22 mm was able, inter alia, through the design of the electrode system to dominate the high anode dissipation up to 12 W in miniature tube bulb - EL84 carefully manufactured heard despite the high material stresses during operation of the most reliable power tubes at all.

Particularly well known is the output tube from the 1960s through the use of the stage amplifiers Vox AC15 and AC30 the British company Vox.

Equivalents tubes are the 7189, which was provided with extended operating parameters primarily for industrial applications, and the same design, the USSR produced 6P14P (Cyrillic: 6П14П ). A slightly modified version of the 6P14P is made in 2007 in Russia by the company Sovtek. In addition, there is also producer in Slovakia, Yugoslavia and China.

Pictures for EL84

The anode of a Valvo EL84, visible traces of electron bombardment.

The individual parts of a system Valvo EL84 (without piston and mica washers).

EL84 SEL as Beam - Power version: Reflective cut in the anode plate shows the jet plate.

EL84 SEL as Beam - Power version: detectable only two spine couples radiant panel flap covers the cathode.

The internal structure of an EL84