Total Cathode Current = DC milliamps = Voltage Across Cathode Resistor / Cathode Resistor. Lets say youve decided you want a new Fender Telecaster, then you need to go through all of the many models that are released under the name to choose the one that you like best. Do not try to force the tube socket into the base, the base is Bakelite and will crack. Dual current meters; Maximum test current: 100mA; 5.5/2.2 mm DC plug; Tube socket cable length: 23cm ; High conductivity copper; Ceramic socket; Gold pins; Solid quality One application of this type was in "Australian Sound" public address amplifiers commonly used in government schools in Australia in the 1950s, using four EL34s for 200 watts. This tube, with its scooped midrange and aggressive tone, would inspire a generation of British, and later American guitarists to move away from the less intense sounds that filled the popular music charts in previous decades. Groove Tubes are considered to be one of the leading producers of vacuum tubes in the world. From the Mullard datasheet: EL34 PP @ 375 plate, pentode mode, 3K5 OT. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. The 6L6 offers significantly more headroom than the EL34, making it better at taking pedals and harder to push into distortion. There are several variations of the EL34 vacuum tube, which combine new and existing qualities. The KT77 is another popular variation on the original EL34 design. When combined with a distortion or fuzz pedal, these tubes sound huge! They are therefore very easy to push into warm saturation when gain is added to the signal. Hi Alex, Do you feel the amp is running ok with 635 V plate and 40ma current per tube ? He played guitar for Metalcore act Familiar Spirit, who released an album and toured across the UK and Europe. Finally, we analyzed the dynamic range of the tubes and how they affect volume. What do you recommend for milliamp bias per tube ? Solder the two conductors of the cable, one to pin 8 on the tube base and one to pin 8 on the tube socket. It's the sound of Pete Townsend and The Who. More commonly found is a pair of EL34s running class AB1 in push-pull around 375-450 V plate voltage and producing 50 watts output (if fixed bias is used), while a quad of EL34s running class AB1 in push-pull typically run anywhere from 425 to 500 V plate voltage and produces 100 watts output. catalog shopping cart. At over 600V plate voltage EL34 PP runs in class B. Mesa/Boogies EL34 STR 450s are a revamped version of the German manufacturer, Siemens vintage power tubes. JJ Electronics EL34 and E34L data sheet (PDF), Tube Data Archive, thousands of tube data sheets, https://en.wikipedia.org/w/index.php?title=EL34&oldid=1111271817, Short description is different from Wikidata, Articles with unsourced statements from October 2009, Creative Commons Attribution-ShareAlike License 3.0, Tung-Sol 6CA7 (EL34 Substitute) Vacuum Tube Logic Book 2nd Edition, 1994, page 151. This configuration is typically found in guitar amplifiers. 1 - Double banana plug. Includes two 8-pin probes with gold plated pins and socket, power adapter and operating instructions. And, it does an excellent job, offering great tone and clarity. Svetlana EL34 is the finest power tube of its type being manufactured today. (Be ready to quickly put it back on standby if the current is too high.) Make sure you plug into the two holes that are for current measurement in If you purchase through links on our site, we may earn an affiliate commission. EL34 is a thermionic vacuum tube. One BIG Caution - when using cathode (automatic) bias DO NOT try to implement a High Voltage Standby Switch. Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-P, Plate Current) $16.99 tube bias probe bias probe bias master tube bias tool vacuum tube tester tube tester el34 tube socket vacuum tubes kt88 Videos for related products 2:11 Pretty Cool! However, this configuration is rarely found. . As an illustration of their quality, Mesa/Boogie installs the EL-34 STR 447 tubes in all of their compatible amplifiers. So it can dish out a huge amplification of the frequencies it receives. CT1-C is a bias current probe tester for testing CATHODE current of vacuum tubesSuitable for tube model EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027 etc.Banana Jack Plug ,same as your multi-meter probe; Tube socket cable lengh: 23cmCopper with excellent conductivity; Ceramic socket and gold pinsDouk Audio is committed to provide highest level of customer service. Plate Current per Tube = DC milliamps = Total Plate Current / Number of Tubes. (Actual Plate Voltage) Example: Octal - pins 3 and 8 9 pin - pins 7 and 3: Cathode Current (milliamps) Thanks. OUTPUT PENDODE. I am very fussy and want to dial it in exactly to what I want to hear. the bias. Push the whole contraption together so that wires soldered to pins 1 through 7 on the tube socket come out the bottom I am not a tech so excuse my ignorance. The driver stage for the output stage will be all solid-state. As youd expect from a highly respected manufacturer like Mesa/Boogie, these tubes have been accurately matched so that they can slot into an amplifier with the right bias settings and get to work right away. I am not a tech so excuse my ignorance. The two attributes which EL34 tubes are best known for are their high headroom and high output wattage. Based on Plate Voltage and Cathode Current Readings. Different tubes and different plate voltages will result in different bias points. the other end. Because of the language barrier it is hard for me to get across my ideas. This tube can be used as a direct replacement for the EL34 in any power amp section and produces a slightly cleaner sound with less prominence in the low end.EL34 Variations. However, their results dont detract from the natural qualities of your guitar combined with your amplifier. Jacob has extensive knowledge of guitars, amps, cabinets, digital modeler equipment, and a familiarity with virtual instruments and synthesizers. The 6.3v filament tap on the power transformer has to be capable of providing enough current for the power tubes, preamp tubes and pilot light. (Generic setting) The USSR analog was 6P27S (Cyrillic: 627C). What do you suppose is wrong with the one tube that wont bias? By the way there are many plus points to the amp. EL34 power tubes provide a desirable amount of overdrive, and sound incredibly good at high-gain amp settings. Problem is the neg bias voltage is only -44 and we need around -60 to get the current down. Any other ideas? The product dimensions are 1.25 x 1.25 x 4.4 inches, and it weighs around 0.352 ounces. So I bought worlds ugliest PRS for $500. more bias current (less bias voltage). Too much crossover distortion will sound harsh. However, Sylvania (and possibly GE) marketed a tube as 6CA7 which was not only in a markedly different 'fat boy' envelope, but used a beam forming plate much like a 6L6. If However, using matched tubes requires you to bias your amp, if it is of the fixed bias variety. Not all EL34 tubes produce the same sound, and before long there was a selection of different varieties available to guitar amp manufacturers. The way I set bias is the shunt method , I first check the plate voltage to know where I want to adujust the grid voltage( the negative 37 or negative 57 volts you speak of) to get the proper plate current (the 28mA or 42ma you speak of). EL34 tubes are generally more cost-effective if you buy a multipack, and this will save you time when you come to replace the tube in the future. Maybe you got a. JavaScript is disabled. And more heat means more resistance. EL34 Push-pull Tube Amp Kit TU-8340 adopted "Semi-automatic bias adjustment system" - which allows users to adjust the bias simply by pressing buttons even if the model takes on the fixed bias method - no need of manual adjustment every time of tube rolling. While the EL34 is no longer made by Philips, it is currently manufactured by EkspoPUL in Saratov, Russia (Electro-Harmonix, Tung-Sol, Mullard and Genalex Gold Lion brands), JJ Electronic in adca, Slovakia and by Hengyang Electronics[2][3] at former Foshan Nanhai Guiguang Electron Tube Factory in southern China, (Psvane and TAD[4] brands). Questions: Is 40ma the proper current level to bias JJ EL34's? :), Quote from: silverfox on March 26, 2013, 01:35:34 am, http://www.weirpowerindustrial.com/images/quinshan%20cut_v_Variation_1.jpg, Quote from: PRR on March 26, 2013, 05:09:06 pm, Quote from: silverfox on March 28, 2013, 07:48:44 pm, Go here and read this post first, then post your problems in the forum - Click here, Quote from: silverfox on May 11, 2013, 09:03:38 pm. Let's say that measurement was 498 VDC The formula is: (17.5 watts dissipation) divided by (498 VDC) = 0.035 amps cathode current = 35mA So you would want to make sure that the highest reading EL34 is at 35mA to get max tube life. the tube socket. There is no bias pot in the amp. My goal is to build a push-pull output stage with octal sockets so I can listen to some 6L6, EL34, and KT88 tubes. They provide a slight increase in attack and bolster the midrange frequencies to make them more prominent. The instructions say "2 turns", you start and warm the engine, then turn back and forth for best idle. This page was last edited on 20 September 2022, at 04:12. Differences in the tube sockets can be the culprit 12141319. I may understand this better now see if this is correct: Adjusting the bias means adjusting a voltage on a screen inside the tube until a certain ma value flows from plate to cathode. I think i'd like to try running them cooler, around 30ma per tube to see if I like it better. 4. Class A one tube, fixed bias Plate voltage 250v DC Screen voltage 250v DC (2000 ohm series resistor) Plate current, idle 70 mA Grid bias -14.5 v DC Load resistance 3000 ohms Output power 8 watts Total harmonic distortion at . However, some EL34 tubes offer more headroom than others. I guess my information is a bit dated!! Mobile users Enter My Tube Amp Parts Store Here, Check the huge library of Schematics here, Design your own custom Turret Board or Eyelet board, This bias checker was the first one and the most primitive. The plate voltage at idle is set by the HT (B+) voltage and the plate load. This tube originated in the USA and takes some of the sonic qualities from the 6L6 vacuum tube then blends them with the high headroom and energetic sound of an EL34. It is a resistor that will be able to read the negative bias voltage on one end and is connected to ground on Because of the language barrier it is hard for me to get across my ideas. Compared to the 6L6 tube, the EL34s midrange is scooped more noticeably, which draws more attention to the bass and treble frequencies. We will now locate our bias adjustment trimpot and set it for 38.33mA using our bias meter. Although power pentodes and beam tetrodes have some differences in their principles of operation (the beam forming plates of the beam tetrode or fifth electrode (3rd grid) of the pentode, both serving to hinder the return of unabsorbed electrons from the anode (or plate) to the 4th electrode (2nd grid)) and have some internal construction differences, they are functionally closely equivalent. These three tubes all share almost identical electronic designs but produce different sounds. You need a two conductor wire to exit out that hole and go to a double banana plug. The key difference between these tubes is that they operate differently electronically, which impacts the way they sound. EL34 tubes are generally better suited to large amplifiers, rather than small tube amps designed for practicing at home, for example. Do. Not for 7591 tubes. They add warmth to the midrange while tightening the bass frequencies and adding definition to the highs. Whats important for biasing is the measure of plate dissipation. For a better experience, please enable JavaScript in your browser before proceeding. Solving for I we get I = P V When biasing to 70% or whatever percent you're looking for you simply multiply the answer by that number divided by 100. Haven't had a chance totalk to the builder about it. We review products independently and our recommendations are genuine. It wasnt long before American guitarists also started to adopt the EL34 to shape their tone. The calculator will give you the bias current for each tube. The same can be said for EL34 vacuum tubes. 21.5 mA @ 70% w/ the EL34 rated at 20 watts. The end. of pins 1 through 7 on the tube base. Limited production model for 2016 Winter. Old Laney Klipp 100 run EL34 plates at 600V, I usually bias them at 32-35mA plate+screen current. A.F. Mesa/Boogie has matched this pair of EL34 tubes so that you dont need to worry about bias issues when installing them in your amplifier. -46v could result in 33ma, or 43ma. Pin 6 is not used and so there is no need to wire it up. Pin 6 is not used and so there is no need to wire it up. The KT77 is another popular variation on the original EL34 design. I think I'm getting a better idea now, but this leads to other questions. The current flows up from pin 8 of the tube base, out through the multi meter and then from the multi meter to pin 8 of Features Matched for consistency Includes a pair of EL34 tubes Based on retro German designs Pros Clear treble frequencies Highly sensitive and accurate dynamics Increased sustain Cons 0 Members and 1 Guest are viewing this topic. The effect that these EL34 tubes have on an amplifiers dynamics is subtle, but significant nonetheless. The built of this EL34 tube is very durable and has a thick glass covering. The amp came with two 6CA7 tubes. 04-19-2010, 08:29 PM. How to build the Bias Current Checker: The Tung-Sol EL-34Bs are often used in British-style amplifiers. Invented in 1949. that dominated popular music in the early and mid-1960s. This is beneficial if you play a lot of riffs or chord patterns in the bass end of your guitar. Made with classic Russian durability, they wont buckle under the pressure of constant usage. Compared to other popular power tubes, the EL34 produces a solid, more aggressive low-end, with a polished midrange and tight highs. inside the area where the tube plugs in or your socket will be ruined. Solder pins 1 through 7 at the tips of the tube base pins. When designing these tubes, the manufacturer used a unique method which they describe as adding heat wings. Might result in a brighter sounding amp. The Bias Voltage is -38. Moreover, they are a result of years of experience in tube manufacturing and perfecting their design. At over 600V plate voltage EL34 PP runs in class B. Cooler bias will most probably cause increased crossover distortion. * Plug the banana plug into your Multimeter. You can easily push them into overdrive by upping the velocity of your strumming or picking, which is a valuable asset when soloing in a live setting. But thats the way i understand it and do it and it seems to work just right. More commonly found is a pair of EL34s running class AB1 in pushpull around 375450 V plate voltage and producing 50 watts output (if fixed bias is used), while a quad of EL34s running class AB1 in pushpull typically run anywhere from 425 to 500 V plate voltage and produces 100 watts output. In addition, the robust power transformer can support tubes with higher heater current requirements such as the KT88 series including KT120 and KT150. i have done that. In audio amps, the EL34 tube produces that signature velvet-smooth mids. Jack feels the amp must run between -41 to -38 volts. If youre a fan of the unmistakable British guitar tone, I think youll love the results that these EL34 tubes produce. Their reputation is based on their consistency in recent years, which is perfectly illustrated by these GT-EL34S power tubes. If you do not have a bias pot, you will have to figure out where the fixed resistor is in the bias circuit that controls This essentially means that wing-like components have been joined onto the plate, which increases their power, and improves longevity. In addition to their impact on liver performances, these EL34 tubes also improve the sounds of your microphone recordings. Tung-Sol's EL-34B Platinum tubes have been meticulously designed to ensure that they produce a powerful, defined output in the low, mid, and treble frequencies. Sodo we know who were the ones that Dumble refused to build amp for ? The OT is rated for max power/current, it'll be fine in both modes. At low volumes, the high headroom of the tubes will be less effective. My tech suggests installing a small transformer for the bias voltage. These items are located on my Tube sockets page Pin 8 from the tube base is sent out to a Multimeter set to dc milliamps and sent back to pin 8 of the tube socket. Even though Marshall offers matched replacement sets, the company recommends the amp be re-biased whenever the output tubes are replaced. You can see the current flow in the diagram above. Solder a 2 inch or longer bare wire to pins 1 through 7 on the tube socket. The meter is set to DC milliamps and the range is set to under 200 ma on the meter. EL34 excels at reproducing horns and female vocals with silky-smooth textures. If youre a fan of warm breakups, you can capture them via a microphone when using these tubes. Fixed bias app. For 8-pin power tubes such as 6L6, 6V6, 5881, 6550, EL34, KT88, KT66, KT100, etc. This calculator is for a single tube. Installing these EL34 tubes is very easy and straightforward, providing your amplifier is set up to accommodate these types of tubes. Used by Fender in their modern tube amps, Groove Tubes is a highly respected manufacturer. With minimal gain added, they enhance the smoothness and clarity of a clean tone. Tho actually i believe you need to subtract about 5 Mv from that due to the screens pulling about 5 Ma. For EL34 tubes with a plate voltage of 456.6V, we see our bias point will be 38.33mA. For use with octal tubes EL34, E34L, 6CA7, KT66, KT77, 6L6, 6V6, 5881, 6550, KT88, KT90. If you own an EL34 amp, you know the magic it produces. This tube can be used as a direct replacement for the EL34 in any power amp section and produces a slightly cleaner sound with less prominence in the low end. Invented in 1949, this tube is synonymous with the British guitar sound that dominated popular music in the early and mid-1960s. They produce a snarling, energetic tone that suits riffs, solos, and chugging chord sequences. 1 - 8 Pin ceramic Marshall style tube socket. The current flows up from pin 8 of the tube base, out through the multi meter and then from the multi meter to pin 8 of the tube socket. Have around 440v at plate. I will get this data to him and see if he understands. Simple Bias Current Checker: I would like a cleaner sound with more upper mids and right now I'm just guessing that maybe if we lower the current it would help. This makes them highly suitable for heavy rock, heavy blues, or heavy metal styles of playing. The sweet spot that these tubes possess is a real joy to behold, and when it is combined with the perfect amp settings and some capable effects pedals, the results are magical. Hi Alex, Do you feel the amp is running ok with 635 V plate and 40ma current per tube ? * Plug your power tube into the Bias Current Checker. The same process is true for EL34 's , KT66, KT77, KT88, but the numbers will be different according to the maximum power the valve can handle Most manufacturers state the maximum power the valve can dissipate is 30 watts. The EL34 is one of the most popular vacuum tubes used in guitar amplifiers. You must log in or register to reply here. I'm confused about the correlation between voltage and current. One of my goals is to improve my writing abilities. Yes its a Kafel. If youre a fan of saturated rock tones, youll love the way that these EL34s push the midrange of your amplifier to add warmth and definition. At over 600V plate voltage EL34 PP runs in class B. Cooler bias will most probably cause increased crossover distortion. Jack likes running them very hot. Plate Dissipation = (Bias Current x Anode Voltage) / Tube Power From this, we can plug in the numbers and see that AVC sets the bias current at 40mA to get that 75% (0.75 = 0.04 x 470 / 25), but this runs the valves very hot resulting in more power but much shorter life. Changing EL34 tubes to 6CA7 or KT77 tubes is very easy, as they are designed to be drop-in replacements for one another. These are some of the best EL34 tubes for hifi or guitar amplifiers. I poured epoxy down inside the sockets to make them solid on mine, but this in not necessary. These EL34s are proof of their commitment to creating high-quality tones. These EL34 tubes are described as medium, which means they fall into the range of 4 to 7 on the output scale. Marshall uses these tubes in many of their amplifiers, which is a strong indication of their capabilities. The Gear Page is the leading online community and marketplace for guitars, amps, pedals, effects and associated gear.
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