The 12ax7 is a miniature highmu twin triode, each section of which has an individual cathode connection. Jj ef806 is a pretty good tube, the only thing missing is ef86 marking because it is not near specifications of real ef806. Folks ive got three ef86 s an eh and two of the new jj ef806s all are microphonic. It was developed around 1946 by rca engineers in camden, new jersey, under developmental number a4522. Its design is low noise and antimicrophonic and was developed from the b8a ef40. The el34 was the 1952 successor to the very successful el37 and both share a high value of mutual conductance 11. This tube sports a different plate design than found in most 12ax7s.
I had zero problems for a couple of years but within the last half of a year i am getting a decently high failure rate either too much self noise or outright failure around one tube failure for very three good tubes within three months. The jj ef806 can be used in any ef86 circuit including microphones and. It was first shown at the 1953 radio show and first used in their 510 amplifier from 1954. Svetlana ef86 highperformance audio smallsignal pentode he svetlana ef86 is a glass envelope miniature pentode intended for highquality audio preamplifier service. Close manufacturing specification tolerances and improved processing provide improved reliability and superior sonic performance.
This is a suitable replacement for any ef86 tube type. Datasheet of triodes, diodes, penthodes,tetrodes, vacuum tubes. Requires sorting to get low noise and tight bias as ral tube of this type should have. The ef86 is a high transconductance sharp cutoff pentode vacuum tube with noval. Ef86dario philips philips the dario miniwatt ef866 were made in holland and dario was a trade name used by philips. I am at a standstill in the build due to my 0 understanding of the ef86806 components and operation. The el34 is a much loved audio power valve with an anode dissipation of 25 watts. The 12ax7 was originally intended as replacement for. An industrial variant of the tube is known as 6267. The ef86 is a high transconductance sharp cutoff pentode vacuum tube with noval b9a base. Folks ive got three ef86s an eh and two of the new jj ef806s all are microphonic. Normally, i like jj tubes and have used them in a number of projects, but to my ears, the jj ef86 sounds weak in this particular project i tried two different ones. Any insight andor clarification would be greatly appreciated.
In the former soviet union a variant was also produced as type 6zh32p russian. Ratings volts 600 vac amps 1800 a ir up to 30 200 ka. There are some small differences, but most of the tube data is close. Ecc81 datasheet pdf the mullard ecc81 was designed for rf use and is of medium impedance. When reading the data sheet, first thing you see is. The route 66 uses a single ef86 into a passive eq section, to a phase inverter and a fixedbiased kt66 pushpull pair. At the bottom of this page youll find some links to other tube datasheet sites in case you cant find what youre looking for here. It was introduced in the late 1950s and was produced by philips, mullard, telefunken, valvo, and gec among others.
Vacuum tube ef806 ef86 6267, jj electronics, long plate. Great sounding tube for matchless, bad cat, dr z, vox or any guitar amp application. Russian nos ef866267cv2901 these are old military production from the 1970s and are no longer being made. The ef86 was used in many preamplifier designs during the last decades of vacuum tube hifi development. Ef86mazda ru mazda these mazda ef86 date from the early 1980as and are of russian origin as they are all have the distinctive pimple style. The ef86 is a high transconductance sharp cutoff pentode vacuum tube with noval b9a base for audiofrequency applications it was introduced in the late 1950s and was produced by philips, mullard, telefunken, valvo, and gec among others. Acrobat pdf 8 pages, gif1, gif2, gif3, gif4, gif5, gif6, gif7, gif8, grey1. It was released for public sale under the 12ax7 identifier on september 15, 1947. Please see the substitutes at the top of the page for more details. The 12ax7 was originally intended as replacement for the 6sl7 family of. These have very good microphonic performance but lowest microphonics version is recommended for combo amps. The jj ef806s tube is another great choice for a new production ef86 tube. The ef86 is the standard early stage audio preamplifier valve.
The ef86 is a high transconductance sharp cutoff pentode vacuum tube with noval b9a base for audiofrequency applications. Unlike many pentodes it was designed specifically for. The el37 was of pinch construction whereas for the el34 mullard used the pressed glass foot construction employed on the b9a and b7g miniature valves for this io. The jj ecc83s tube has several improvements in its construction from the old ecc83 version. Datasheet hplaserjetenterprisemfpm631 series thishplaserjetmfpwithjetintelligencecombinesperformance,energy efficiency,andsecurity. Noval u f 6,3 v i f 0,760 ma typical characteristic. This is a nice choice for the input tube in old mullard amplifier circuits. Gittervorapannung 939 0673 philips ecc818 vgv 7r031s5 i. You will find thousands of tubes or valves with interesting links. I was everclearfan86 i know, i know for the longest time until i changed my channel name and went largely inactive for a few years in order to go to colleg. May 23, 20 the 12ax7 is a miniature highmu twin triode, each section of which has an individual cathode connection. The jj electronic ef806s is a high quality reproduction of the classic ef86. Jj ef806s datasheet pdf download adobe acrobat pdf reader. The jj ef806 can be used in any ef86 circuit including microphones and amplifiers.
It is especially suited for use in resistancecoupled voltage amplifiers, phase inverters, multivibrators, and numerous industrialcontrol circuits where high voltage gain is desired. Twin triode, 12ax7 datasheet, 12ax7 circuit, 12ax7 data sheet. Double triode ecc81 is 12at7 medium gain preamplifying double triode. The jj ef806s tube can be safely used in any ef86 circuit. Maximum plate v for 12au7, vs v for cermolox tetrodes have many performance advantages, but visual examination of the tube s internal structurefilament current carefully to assure normal filament, as well as tubeoperation. The full mullard data sheet is available by clicking the valve name at the top of the page. In the former soviet union a variant was also produced as type 6zh32p. Jul 04, 2019 jj ecc82 12au7 tubevalve effectrode from wikipedia, the free encyclopedia. This exhibit was made by mullard who designed the ef86. You even can look up radio models with a certain tube line up.
Russian nos ef86 6267cv2901 these are old military production from the 1970s and are no longer being made. You reach this tube or valve page from a search after clicking the tubes tab or by clicking a tube on a radio model page. 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. Svetlana ef86 highperformance audio smallsignal pentode t. Gec, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors. Effective december 2017 supersedes march 2017 jjs limitron 600vac, 1800a, fastacting class t fuses catalog symbol. Most of the datasheets are in pdf format and some are links to other html pages. Microphonics are not an issue in combo amps, so we finally have an ef86 type that works at this conditions. This tube has a different pinout and cannot be used in 6bq5el84 sockets unless you have verified it will work.
Eatons bussmann series limitron advanced protection class t currentlimiting, fastacting fuses. A centertapped heater permits operation of the tube. This pentode features a robust construction with the internal shielding used in the original tubes. Ecc83 datasheet pdf, ecc83 data sheet, ecc83, ecc83. When you look at them you cant help but think that they must be rugged and good for the musician on the road. It is very similar electrically to the octal base ef37a and the rimlock base ef40. Jj electronic vacuum tubes, capacitors, amplifiers. A collection of we datasheets from the 40s through the 60s, including 100 through the 300b 17mb pdf file 301a through the 373a 14mb pdf file 300a300b data sheet highres, 4. Pic12f629675 data sheet 8pin flashbased 8bit cmos microcontrollers. I am at a standstill in the build due to my 0 understanding of the ef86 806 components and operation.
Implied by the use for digital systems, the tube can be in stand by mode for a long time. Designed for endurance and longevity for application in the audio industry. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. In use it is recommended that it is fitted into a vibration resistant base. It was used as a frequency pins the length is 48 mm. Purchase jj ef806s vacuum tubes online, in stock and ready to ship. Ua 250 v ug2 250 v ug1,5 v ia 100 ma ig2 10 ma s 10,5 mav ra 23 k. The el37 was of pinch construction whereas for the el34 mullard used the pressed glass foot construction employed on the b9a and b7g miniature. As of 2012 ef86s were being produced in russia in two versions under the electroharmonix brand and in the slovak republic as jj electronic formerly. Effective december 2017 supersedes march 2017 jjs limitron.
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