Depends on what the data sheets say for the power tube you want to run. These are the first generation of this excellent tube, with square getters. There is more information available about tube power supply design in the power supply design for vacuum tube amplifiers article. This means that a single spp board is used with one power transformer and two output transformers to make a stereo hifi amplifier. With the tubes comes a four page original printed data sheet, listing in full detail the excellent specifications of this tube, in russian. The intention for this amplifier was to drive classic highefficiency speaker systems, such as western electric we594a or we755a. I just purchased a pioneer sx 800 receiver from a forum member, and when it got here, one of the tubes had wiggled out of the socket, and the top is broken. Atarashi used for his listening test was a pair of western electric, we735c monitor speakers. This amplifier was featured on the february 2004 issue of the highfidelity audio.
I looked at it, and it is an el846bq5, and it is supposed to be a 7189a. Electron tube type el84 6bq5 miniature power pentode the el84 is an output pentode designed for application in medium power high fidelity and musical instrument amplifiers. Tube amp information, guitar amp schematics, tube amp. The sovtek el84m is a rugged military issue el846bq5 that can withstand higher plate current than any current production el84, and is a suitable replacement for the 7189. Y el84 single ended single ended amplifier amplifier dont make nfb this version because in general sound get tight when made some kind of nfb. According to the data sheets found in old vacuum tube reference manuals, a pair of el34s with 800 v plate voltage can produce 90 watts output in class ab1 in pushpull configuration. Set el84 tube amp diy project sarris custom tube amps. It is used in the power output stages of audio amplifiers, most commonly now in guitar amplifiers, but originally in radios. At the time this manual was written, the tubelab spp has only been tested as a stand alone push pull amplifier. Thd y ellow jackets are specialized adapters which permit the use of el846bq5 power tubes in place of 6v6, 6l6, el34, 7027 6550 under 520 volts and 7591 types.
A tube with a microphonics measurement of 900 uvrms or. Good if guitar players want an alternative from the warm distortion. The true pentode characteristics of this tube reduce. The el84 was developed to eliminate the need for a driver tube in radios, so it has rather more gain than is usual in a power pentode. The el34 is a much loved audio power valve with an anode dissipation of 25 watts. It has a 9 pin noval base and is used mainly in the power output stages of audio. The el84, or commonly known as 6bq5 in north america, was intended for use as an inexpensive alternative to the larger audio tubes of the time, such as el34, 6l6, and kt66 power tubes. A single el84 was used in lowcost equipment, and a pushpull pair for lower distortion and higher power. Gec pentode for af power amplifier applications,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. By the late 1950s there was a large selection of stereo hifi audio tube amplifiers available. Tube 6bq5 or rohre 6bq5 id, vacuum pentode, noval, b9a and power output shown. This simple and clever design was exactly what i had in mind.
May 06, 2019 a single el84 was used in lowcost equipment, and a pushpull pair for lower distortion and higher power. Tubedepot carries a selection of el84 6bq5 7189 power vacuum tubes. This comparison only covers a few of the external structural differences. U a 250 v u g2 250 v u g1 7,3 v i a 48 ma i g2 5,5 ma s 11,3 mav.
It was originally designed for the military to have longlife audio tube with lowmicrophonics, and not having to use the lower quality el84 radio tube for this. Eirc electronic tubes factory data sheet el84 page 1 of 8 telephone. An interchangeable north american type is the 6bq5 the retma tube designation name for the el84. European el84 tubes are rare, and the mullard made tubes are among the very best. The 1959 miniwatt technical data book from philips lists the 6bq5 as the r. Owners of amps from dynaco, eico, mullard, and fisher, among others, were enjoying great sound from these reasonably. Hashimoto was not expecting to hear the powerful, but shining sound from his vintage speakers. As for sonic differences let your ears be the judge. Datasheet of triodes, diodes, penthodes,tetrodes, vacuum tubes. The input stage uses a ef86 to drive a mullard el84. Sep 22, 2011 the sovtek are probally 6bq5 6n14neb, a good replacement for 7189a and 7591a el84m. In common with all e prefix tubes, using the mullardphilips tube designationit has a heater voltage of 6.
Jun 23, 2019 tdsl tube data 6p14p so if parameters of a lot are the same, the higher expectations you can have to the base quality of that lot. This will lead unavoidably to a wider spread in tube parameters. Pushpull pp el84 tube amplifier schematic ecc83 input. May 28, 2019 a similar situation we have for the philips el84, also a fantastic tube, but expensive. This is the classic singleended el84 schematic from mullard. For more information about tube based power supplies, see the article power supply design for vacuum tube amplifiers. Retrieved 25 may in common with all e prefix tubes, using the mullardphilips tube designationit has a heater voltage of 6. Noval u f 6,3 v i f 0,760 ma typical characteristic.
Try searching the tube data datebblatt locatorthe worlds biggest index of tube datasheets. It is a thermionic valve of the power pentode type. Assembly manual schematic parts list tubes and applications. The 7189 is a power amplifier pentode designed for use in audiofrequency power output stages of high fidelity amplifiers, guitar amplifiers, and other radio receivers. A similar situation we have for the philips el84, also a fantastic tube, but expensive. The photos and comparison chart in this article compares and contrasts the current production russianmade sovtek el84 and genalex gold lion n709 el84 with the vintage genalex gold lion n709 el84. The most convenient way to develop my idea was to use an already existing design. Like a box of getters was in contact with air too long, etc. The thin glass tube envelope is 20 mm in diameter and, excluding the b9a base pins, is 70 mm tall. Pentode for af power amplifier applications, 6bq5 datasheet, 6bq5 circuit, 6bq5 data sheet. Philips, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. June learn how and when to remove this template message. The el84 is a thermionic valve of the power pentode type. Please see the substitutes at the top of the page for more details.
Output pentode quick reference data anode current ia48ma transcoductance s11,3mav. Gec, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Perhaps not many 66p14p the readers had the chance to compare lots pcs original packed nos tubes with each other, or compare such lots with pcs of new made tubes. The 6bq5 is a poweramplifier pentode designed for use in the audiofre quency poweroutput stage of television and. Mar 06, 2020 the sovtek el84 is often sold under their own brand name by other wellknown electric guitar and guitar amplifier manufacturers such as fender or mesa boogie. The tube amp schematics library check out the huge library of guitar tube amp schematics, effects and many other types of schematics please visit my tube amplifier forum. Output pentode quick reference data anode current ia48ma transcoductance s11,3mav amplification g2g119 output power wo6w heating. The sccond grid voltage at zero tube current cathode current is no inore than 10. The sovtek el84m has a clean sound, and nice balance. Pl83 6bq5 equivalent singleended ultralinear stereo power amplifier. Tube amp information, guitar amp schematics, tube amp information.
The pushpull el84 tube amplifier schematic is from the book build your own audio valve amplifiers by rainer zur linde. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. Type el34 was first introduced in the el34 is smaller in diameter and taller than the 6l6 and is capable of a higher plate voltage. Datasheet 6bq5 pdf power pentode 1page the el84 was developed to eliminate the need for a driver tube in radios, so it has rather more gain than is usual in a power pentode. By clicking the link from the exhibit name above, the full mullard datasheet can be downloaded. The el84 is smaller and more sensitive than the octal 6v6 that was widely used around the world until the 1960s. The real audiophile does not care about small power when one is using single ended amplifier. Nos stocks of this tube have been released for public sales only recently, and stocks are low. They will work in any amplifier that takes these tube types, as long as the plate voltage is under 520.
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