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The STR 447 power tubes are very popular amongst rock guitarists. If youre a fan of warm breakups, you can capture them via a microphone when using these tubes. I'm an electronic retard, but the way i do it is the 1 ohm cathode method. * Take the amp off standby. Materials list for each Bias Current Checker But thats the way i understand it and do it and it seems to work just right. Made with classic Russian durability, they wont buckle under the pressure of constant usage. Will that give a plate dissipation of 17,6 W? more bias current (less bias voltage). If youre a fan of warm breakups, you can capture them via a microphone when using these tubes. In my setup, simply the very best value in current production EL34 family tubes. EL34 tube produces smooth highs with pleasant mids in guitar amps. I'm confused about the correlation between voltage and current. For any problems you have . EL34 is a thermionic vacuum tube. The impressive headroom that EL34 tubes offer guitarists means that the amplifier can be cranked up to high volumes, with high gain settings before it is pushed into overdrive. Limited production model for 2016 Winter. Pin 6 is not used and so there is no need to wire it up. Dec 17, 2019 #3 beans-on-toast Aug 7, 2008 Firstly, metal guitarists will enjoy the hard-hitting saturation that they produce when combined with gain, or distortion-based pedals. If you use a 12AT7, youll get a smoother sound with less overall gain. 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. This is beneficial if you play a lot of riffs or chord patterns in the bass end of your guitar. They add warmth to the midrange while tightening the bass frequencies and adding definition to the highs. Groove Tubes return to our list of the best EL34 tubes with their impressive GT-EL34Rs Russian Power Tubes. Jack likes running them very hot. Invented in 1949. that dominated popular music in the early and mid-1960s. When pushed, the EL34 tube will produce the quintessential classic Marshall tone that's instantly recognizable.. Groove Tubes are considered to be one of the leading producers of vacuum tubes in the world. 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. 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 . It allows the amp tube to consume a large amount of electricity. I have set bias to 40mA per tube. They produce a snarling, energetic tone that suits riffs, solos, and chugging chord sequences. * Plug the banana plug into your Multimeter. Solder pins 1 through 7 at the tips of the tube base pins. We'll call this variable x. EL34 is an octal power tube with a maximum plate power of 25W. Basically the way this thing works is that pins 1,2,3,4,5 and 7 pass uninterrupted through the device from tube base to We try to keep a carton or two of our $10.00 "Cheap Multimeters" on hand and if you see them in the online store they are in stock. The product dimensions are 1.25 x 1.25 x 4.4 inches, and it weighs around 0.352 ounces. The OT is rated for max power/current, it'll be fine in both modes. A large contributor to this energetic sound that emerged in Britain at that time was the EL34. Because there is more electricity flowing which creates more heat. 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. i have done that. M Member 1963 Feb 24, 2012 #2 Yeah, 40 is about right for a plate voltage of around 435v. We review products independently and our recommendations are genuine. Haven't had a chance totalk to the builder about it. They provide numerous sonic enhancements for guitar amplifiers. This page was last edited on 20 September 2022, at 04:12. Includes two 8-pin probes with gold plated pins and socket, power adapter and operating instructions. The plate is exactly 638 V and the current is 40ma per tube. 0 Members and 1 Guest are viewing this topic. (Actual Plate Voltage) Example: Octal - pins 3 and 8 9 pin - pins 7 and 3: Cathode Current (milliamps) Its often wrongly assumed that vacuum tubes essentially sound and perform the same, providing they are of the same variety. I'm on a quest: listen to and compare tube types and different bias currents. (Be ready to quickly put it back on standby if the current is too high.) Jack feels the amp must run between -41 to -38 volts. If I am not a tech so excuse my ignorance. I guess my information is a bit dated!! The EL34 is a thermionic vacuum tube of the power pentode type. Simple Bias Current Checker: Even though Marshall offers matched replacement sets, the company recommends the amp be re-biased whenever the output tubes are replaced. The classic Marshall 50-watt "Plexi" (model 1987) is powered by a pair of grid-biased EL34 tubes. For straight-up rock tones, these tubes are ideal. I have some hardware (ultra-linear push-pull transformers and a 350V power supply). * Plug your Bias Current Checker into a tube socket on an amp. EL34 tubes will need replacing after approximately 2500-3000 hours of use. Do not try to force the tube socket into the base, the base is Bakelite and will crack. 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 Might result in a brighter sounding amp. Not all EL34 tubes produce the same sound, and before long there was a selection of different varieties available to guitar amp manufacturers. This matched EL34 pair by Svetlana is one of the most desirable vacuum tubes. Well, we could have a transantlantic teleconference, I speak a couple languages, 85% chance Jacks is one of them, Some of the add-ons on this site are powered by, Amps/Cabs Tech Corner: Amplifier, Cab & Speakers. * Turn the bias pot till you get somewhere around 35 milliamps of current. EL34 power tubes provide a desirable amount of overdrive, and sound incredibly good at high-gain amp settings. In common with all 'E' prefix tubes, using the MullardPhilips tube designation, the EL34 has a heater voltage of 6.3 V. 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. However, this configuration is rarely found. Too much crossover distortion will sound harsh. Its often wrongly assumed that vacuum tubes essentially sound and perform the same, providing they are of the same variety. At over 600V plate voltage EL34 PP runs in class B. Cooler bias will most probably cause increased crossover distortion. It's like the screw on a carburetor. Sodo we know who were the ones that Dumble refused to build amp for ? Hi all! Perhaps the most notable example is Jimi Hendrix, who many consider being one of the most gifted and unique musicians of the 20th century. Problem is the neg bias voltage is only -44 and we need around -60 to get the current down. Its similar to choosing a new electric guitar. In audio amps, the EL34 tube produces that signature velvet-smooth mids. Changing EL34 tubes to 6CA7 or KT77 tubes is very easy, as they are designed to be drop-in replacements for one another. This item is listed on my Jack/Plugs page. I'm going to put together a bias circuit for EL34 or 5881 (6L6). POWER TUBE SOCKET WIRING However, some EL34 tubes offer more headroom than others. If you swap EL34 tubes for 6CA7 or KT77 tubes, your guitar amplifier will produce a deeper low-end, with less saturation in the higher frequencies and a slightly reduced dynamic range. Their warm, immersive tone continues to be popular amongst guitarists even when digital amplifier technology has advanced at such a rapid rate. It is a resistor that will be able to read the negative bias voltage on one end and is connected to ground on Notes: If you have 38ma on one tube and 34 ma on another, they are still close enough to be called a matched pair. Installing these EL34 tubes is very easy and straightforward, providing your amplifier is set up to accommodate these types of tubes. EL34 tubes were introduced in the 1950s and quickly became synonymous with the high-gain sound of British guitar amp manufacturers a decade later. When testing these EL84 tubes, we assessed them based on several key attributes. The meter is set to DC milliamps and the range is set to under 200 ma on the meter. inside the area where the tube plugs in or your socket will be ruined. The USSR analog was 6P27S (Cyrillic: 627C). Interestedly I just looked up the specs and the 6CA7 is now listed as a Beam Pentode. 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. One of my goals is to improve my writing abilities. You do not want to get epoxy :), 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. The amp came with two 6CA7 tubes. Very robust and reliable due to its internal construction. In these calculations, 5% of the cathode current is assumed to be screen current. These three tubes all share almost identical electronic designs but produce different sounds. 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 There may be affiliate links on this website, which means I may earn a small commission from qualifying purchases, at no additional cost to you. I wrote it correctly this time Sluckey. 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. 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. Tho actually i believe you need to subtract about 5 Mv from that due to the screens pulling about 5 Ma. In addition to their impact on liver performances, these EL34 tubes also improve the sounds of your microphone recordings. We then tested the longevity of each EL84 tube, to assess whether they are good value for the price. You must log in or register to reply here. also, so you must swap the tubes around and read them in different sockets to figure out what is going on. The EL34 was introduced in 1955 by Mullard, who were owned by Philips. For clean tones, these tubes will certainly add some warmth to the signal. Used by Fender in their modern tube amps, Groove Tubes is a highly respected manufacturer. This item is listed on my Wire/Cable page. These power tubes are based on the designs used by German electronics manufacturers Siemens in decades gone by. The Granger Amp bias probe measures in milliamps by insertion into the cathode connection that conducts the current to the plate (anode) of the tube. Depending on the way theyre constructed, some tubes deliver a tighter low-end, while others scoop the midrange more noticeably. Groove Tubes are considered to be one of the leading producers of vacuum tubes in the world. Mullard EL34 Power Tube (each) $4495$49.99 FREE delivery Oct 21 - 26 Or fastest delivery Oct 20 - 24 Willsenton R8 KT88/EL34 x4 Tube Amplifier Integrated AMP Power Headphone Replaceable Basic Meter (Silver) 67 $1,44938 FREE delivery Oct 26 - 31 JJ EL34 Burned In Vacuum Tube, Apex Matched Quad 8 $14999 FREE delivery Oct 24 - 25 This increases the tubes consistency across the frequency response and makes them sound tighter. EL34 tubes are generally better suited to large amplifiers, rather than small tube amps designed for practicing at home, for example. of pins 1 through 7 on the tube base. With minimal gain added, they enhance the smoothness and clarity of a clean tone. Mesa/Boogies EL34 STR 450s are a revamped version of the German manufacturer, Siemens vintage power tubes. Compared to most other EL34 tubes, the GT-EL34Rs produce a slightly harsher break-up. 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). Solder a 2 inch or longer bare wire to pins 1 through 7 on the tube socket. The EL34 is a pentode, while the 6L6, which delivers a similar range of power output, is a beam tetrode which RCA referred to as a beam power tube. One BIG Caution - when using cathode (automatic) bias DO NOT try to implement a High Voltage Standby Switch. 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. M2-EL34 test tool is through multimeter get tube's mA ; Measures the cathode current of the power tube for bias reading (at low voltage side of the tubes ) High-Quality 24K Gold Plated Banana Plug Male Speaker Cable Connectors ; M2-EL34 wire length about 65cm. 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. 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. Old Laney Klipp 100 run EL34 plates at 600V, I usually bias them at 32-35mA plate+screen current. When I have adjusted the bias those few times so far, I attempt to set the milliamp per tube values- 26ma for 5881 or 42 ma for EL34.. A.F. These EL34 tubes are described as medium, which means they fall into the range of 4 to 7 on the output scale. The Bias Voltage is -38. My tech has been fixing fenders and marshalls for 30 years but as he admits he is not an engineer. For 8-pin power tubes such as 6L6, 6V6, 5881, 6550, EL34, KT88, KT66, KT100, etc. The calculator will give you the bias current for each tube. If youre a fan of the unmistakable British guitar tone, I think youll love the results that these EL34 tubes produce. 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). The EL34 is one of the most popular vacuum tubes used in guitar amplifiers. These items are located on my Tube sockets page Although the additional heat that these tubes inject into your amplifiers output is noticeable, they also sound great on a clean channel. Differences in the tube sockets can be the culprit the other end. 4) EL34's are 25 watts max and you want to set the bias to be between 60% and 70% maximum dissipation watts. Once you have finished biasing all four EL34 tubes, wait a few minutes . The 6L6 offers significantly more headroom than the EL34, making it better at taking pedals and harder to push into distortion. Finally, the El-34 STR 447 tubes deliver a stereotypically British tone, reminiscent of bands like The Kinks and The Who. Most amps will only be biased to under 50 milliamps per each power tube Click on the images below for a larger image A small hole has to be drilled in the side of the tube base down near where pin 8 meets the base. You need a two conductor wire to exit out that hole and go to a double banana plug. In addition, the robust power transformer can support tubes with higher heater current requirements such as the KT88 series including KT120 and KT150. Made in Russia, these vacuum tubes offer all of the distinctive qualities youd expect from a set of high-end EL34s. 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. (60% = 15 watts; 70% = 17.5 watts) Divide your desired wattage by your plate voltage from step 3. , and this further increased the popularity of this type of vacuum tube. This product can measure the cathode current of power tubes to get its bias current at low voltage side. Different tubes and different plate voltages will result in different bias points. Questions: Is 40ma the proper current level to bias JJ EL34's? If you purchase through links on our site, we may earn an affiliate commission. If you decide to invest in several EL34 tubes rather than buying a single one, you may benefit from choosing a matched set. Use this as a guide for setting your bias. The KT77 is another popular variation on the original EL34 design. Too much crossover distortion will sound harsh. the bias. whoa, thats some kickin volts!what amp is it? 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 You have to change the bias resistor to a larger value for less bias current (more bias voltage) and a smaller value for 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 So it can dish out a huge amplification of the frequencies it receives. You can see the current flow in the diagram above. As i understand it when you measure voltage like that it correlates to current. The same can be said for EL34 vacuum tubes. Any tube unit can be brought back to life. The EL34 was widely used in higher-powered audio amplifiers of the 1960s and 1970s, such as the popular Dynaco Stereo 70 and the Leak TL25 (mono) and Stereo 60, and is also widely used in high-end guitar amplifiers because it is characterized by greater distortion (considered desirable in this application) at lower power than other octal tubes[citation needed] such as 6L6, KT88 or 6550. This is a warm, thick, dense tube with world-class tonality for lovers of guitar music from Esteban to Stevie Ray Vaughan. 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. Because of the language barrier it is hard for me to get across my ideas. You can see the results from these tests in the review section below. At over 600V plate voltage EL34 PP runs in class B. I am not a tech so excuse my ignorance. 04-19-2010, 08:29 PM. * Plug your power tube into the Bias Current Checker. By the way there are many plus points to the amp. A single Red Fang is OK, but IMO an EL34 PP sounds better with two. EL34. 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. They handle high voltage and current without problems. 4. (They are hollow) Groove Tubes are amongst the most prolific producers of EL34s, and its impressive how they manage to combine quality with quantity. There is no bias pot in the amp. These tubes are like EL34's on steroids. You bought two EL34 as replacements. The EL34 is a pentode, it has three grids, while the 6CA7 is a beam tetrode, it has two grids and beam forming plates. By the way I really enjoyed your TubeWonder amp at Makin Music. Fully assembled and ready to use. If you own an EL34 amp, you know the magic it produces. The filament current draw for EL-34 is 1.5 amps each, where for a 6V6 it is only .45 amps (6L6 is .9 amps). Tung-Sol has also designed these tubes to tighten up the low-end of your amplifier, without stifling it in any way. So I bought worlds ugliest PRS for $500. How to build the Bias Current Checker: EL34 Tube. Their reputation is based on their consistency in recent years, which is perfectly illustrated by these, Russian tube manufacturers Tung-Sol produce a wide range of reliable power and preamp tubes designed to upgrade your amplifiers tone. EL34 tubes can be swapped out for two other popular vacuum tubes the 6CA7 and the KT77. As an illustration of their quality, Mesa/Boogie installs the, EL34 power tubes provide a desirable amount of overdrive, and sound incredibly good at high-gain amp settings. This medium duet work with the natural sound of your amplifier, rather than changing it too dramatically. Based on Plate Voltage and Cathode Current Readings. The EL34 is one of the most popular vacuum tubes used in guitar amplifiers. 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. Along with EL34 tubes, the 6L6 is one of the most popular vacuum tubes for guitar amplifiers. JavaScript is disabled. 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. [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. Also, these tubes have been matched meticulously by Tung-Sol, which ensures that they work together with no issues. 1 - 8 Pin tube socket base. Your amp tech, (if you can find one) will check the anode currents of your new valves, and set the amp to draw about 30 ma per valve, for EL34's. It may be a little more 35 ma or a little less 25 ma. Click here to enter my parts Although all Fender Telecasters share some core qualities, such as the body shape, and the general twangy tone they produce, there are some key differences between the different models. 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. 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.
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