The tube is labeled for other companies, but the code for mazdas factory in bruxelles is etched in. The svetlana ef86 is a version of a small pentode which was popular in europe for use in hifi equipment from 1952 through the 1960s. The ef86 1 is a high transconductance sharp cutoff pentode vacuum tube with noval b9a base for audiofrequency applications. One downside is you will need two hands instead of one to transport the amp.
Then, use a metal wire to short the connector l1 displayed as yellow line 3. We offer some of the most comprehensive testing facilities available today. Warranty information and return policy warranty period. It was first shown at the 1953 radio show and first used in their 510 amplifier from 1954. Requires sorting to get low noise and tight bias as ral tube of this type should have. Even if your mixer has phantom power, it is preattenuation switch. I liked them better than the old mullard i have, and definitely better than any new tube ive tried. Apr 28, 2019 the ef86 was used in many preamplifier designs during the last decades of vacuum tube hifi development. This mazda ef86 6267 tube has mesh plates and a halo getter. The uf86 is identical with the df86 of a vacuum tubes guitar amplification tubes electronics stubs. It is designed to be a high quality direct replacement for any ef86 tube or 6267 tube type. The ef86 is a small pentode commonly used in preamp stages. While an ef86 circuit, when working as it should, has a unique and pleasing to many sound, the problems associated w the tube microphonics, tube failure, expense imho outway the benefits of its particular sound. The tube is labeled for other companies, but the code for mazdas factory in bruxelles is etched in the glass.
You even can look up radio models with a certain tube line up. Telefunken is known for their extremely high grade tubes. It is very similar electrically to the octal base ef37a and the rimlock base ef40. One thing i like doing is put a 12at7 tube in v1 position in some amps. Watford valves, one of europes leading suppliers of tested, graded and guaranteed valves to the professional music industry. Ef806s audio pentode ef86 replacement valve tube guitar amps. 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. Further, it has a builtin electrostatic shield, making an external tube shield. Neumann u47, u48 and u67 microphones were originally used by the beatles for their 1960s concerts and recording sessions. Svetlana ef86 highperformance audio smallsignal pentode t. Ef86 datasheet pdf given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. It is designed for voltage amplification, not power production, and thus has a relatively low plate dissipation limit. Unlike the majority of pentodes of this type, the ef86 possesses low distortion, low hum induction and low ionization noise. Russian nos ef86 6267cv2901 these are old military production from the 1970s and are no longer being made.
Close manufacturing specification tolerances and improved processing provide improved reliability and. Makes the first preamp tube signal a bit smoother coming into the preamp chain because of the lower gain of the 12at7. They are cool tubes, and they have a different personality than the more common 12ax7 preamp stage. The uf86 is identical with sheft exception of a the low level of. Ef86 voltage amplifying pentode low noise pentode intended for use as r. 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. The ef86 1 is a high transconductance sharp cutoff pentode vacuum tube with noval b9a base for. The second is normally held at a positive potential, but a capacitor to ground keeps it free from signal and so it screens the control grid from the anode. Plug in the vacuum tube el84 and 6j8 ef86, and turn on the power supply. Fwiw the phillips gz34s are in a class by themselves as well. The nos winged c sed ef86 6j32p tube is a glass envelope miniature pentode intended for high quality audio preamplifier service. Type ef86 was first introduced ef6 this electronicsrelated article is a stub. There used to be a couple of 18 watt layouts with an ef86 in the download section. In pentodes, such as the ef86, we find two more grids.
Tube tester files 6j33p ef86 the ef86 is the standard early stage audio preamplifier valve. It can therefore be driven to maximum power at far lower volume levels. At 20 watts, the 6l6s arent doing much, but i keep them there because a the ot im using is a nice match for them better than the 4k ot i was using previously, b a 6v6 pair sounded glassy and midrangey, and c i wanted to hear the ef86 overdrive without an extra layer of powertube breakup. The speaker will not be beating the snot out of the tiny little innards in those tubes so the ones that start out not microphonic will usually stay that way. Ive done a bit of tube rolling in the ef86 spot in my ac30 heritage, and i gotta agree about the phillips stuff being really great. I have two heads with ef86 preamp tubes but they also have 12ax7 preamp tubes and can be blended in or out. Its design is low noise and antimicrophonic and was developed from the b8a ef40. Although used in circuits such as tape recorder input stages and instrument amplifiers, microphony can be a problem, even when mounted in a vibrationreducing valve holder. You will find thousands of tubes or valves with interesting links. These look much like the philips holland tubes, but wer made in the valvo plant in hamburg. The ef86 is the standard early stage audio preamplifier valve.
I used 1 meg pots in my resent ef86 build, they sound great and get very gainy great tones with guitar volume rolled back i used the ef86 lt in download section and it was a breeze, good luck great amp mark. These have very good microphonic performance but lowest microphonics version is recommended for combo amps. Care in the design of the valve to ensure that the electrode structure and its mounting are as rigid as possible has reduced the microphony of the ef86 to a very low level. Tdsl tube data ef86 the landmark amplifier designs from mullards application laboratories all specified the ef86, and today it is still the valve of choice for this work. Please see the substitutes at the top of the page for more details. Although used in circuits such as tape recorder input stages shfet instrument amplifiers, microphony can be a problem, even when mounted in a vibrationreducing valve holder. These have solid, gray plates with one hole in them.
Each ef806s is tested by us n our avo tester to ensure you receive a good quality valve. The ef806s audio pentode, ef86 replacement from jj electronic is a brand new replacement for the famous ef86 from the 1950s and 1960s. Great sounding tube for matchless, bad cat, dr z, vox or any guitar amp application. This is a suitable replacement for any ef86 tube type. The ef86 is a high transconductance sharp cutoff pentode vacuum tube with noval b9a base for audiofrequency applications. Jj ef806 is a pretty good tube, the only thing missing is ef86 marking because it is not near specifications of real ef806. 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. It was first shown at the radio show and first used in their amplifier from the ef86 was used in many preamplifier designs during the last decades of vacuum tube hifi development. In use it is recommended that it is fitted into a vibration resistant base. Russian nos ef866267cv2901 these are old military production from the 1970s and are no longer being made.
The problem with having an itch for a ef86 is that, in most cases, a. This exhibit was made by mullard who designed the ef86. In such cases a flexible mounting for the valveholder or a separated weighted subchassis is advisable. Valves for audio equipment ef86 ecc83 ez81 gz34 el84 el34.
The ef86 was used in many preamplifier designs during the last decades of vacuum tube hifi development. Mar 27, 2020 ef86 datasheet pdf given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. It was introduced in the late 1950s and was produced by philips, mullard, telefunken, valvo, and gec among others. The electroharmonix ef86 6267 is a high quality current production pentode, very warm and smooth sounding. View and download analog metric c22 user manual online. Ehef86 offered from pcb electronics supply chain shipps same day. The us number for the ef806s audio pentode is 6291. Microphonics are not an issue in combo amps, so we finally have an ef86 type that works at this conditions. Svetlana ef86 highperformance audio smallsignal pentode he svetlana ef86 is a glass envelope miniature pentode intended for highquality audio preamplifier service. 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.
1127 205 1236 883 139 670 1098 307 1159 1376 1493 66 417 1424 394 1329 422 449 1331 1506 752 815 1421 504 651 309 8 216 1189 1340 854 211 1154 392 491 483 970 63 544 633 384 25 1249 1466 1260 437