This turns out to solve a lot of problems that have been present in vacuum tube amplifiers forever. The DCM uses a. I will still list the Weber VST and the Tube Amp Bias Calculator suggestions, but be forewarned that I will not be attempting to reach any of the bogey values listed. Measures the current of 4x any standard base octal power tubes (6L6, EL34, 6550, etc). el34 / kt77 / 6ca7 Popular in high powered audio and high end guitar amplifiers, characterized by greater distortion at a lower power compared to other power tubes. Tube Data Sheet Locator. 34L tubes (no matter who the manufacturer is) seem to be bass heavier than their EL34 counterparts. EL34B tube upgraded to PSVANE brand. 7 * 25/400) = 44mA. The meaning of the term 'Amp Bias' How tube amp bias will affect your guitar amp tone; When you need to have a tube amp biased; The guitar community seems to be shrouded in the mystery that is tube amp bias and in a way, it's probably for the best. This modification must be done at Quicksilver and comes with a one year warranty. If the amplifier has been used recently the output tubes will be HOT. This is your plate or "B+" voltage. Here is the email from Tranyor: While it is safe to install EL34s in a YCV80 (or YCV40 for that matter) the bias point needs to be adjusted to optimize it for the EL34s. If the tubes haven't been removed for a long time, it may feel 'sticky' and 'tight'. Spec said will be get 10W rms with 6L6 but actually never get 10W rms. I've just ordered some new quads of EL34's for my highly modded dynaco st-70. eBay Logo: Shop by category. Totally different tube. This is the first tube amp that I've ever owned that did not have a bias meter built in to the amp. Tadaatsu Atarashi. I have a pair of original 1978 Tesla EL34's and those are sweet and very similar the =C= actually. Western Electric - $1,750. 01 3 3 1969. I´d never thought that MM built these amps with 6L6, but just read in the Model Chart of this great site that these amps actually exist with 6L6!!!. Tube manufacturers also re-issued KT77 in recent years. Check out DrTube[0] for additionnals data. When compared to the other two—rectifier and preamp tubes—the power tube's effect has less to do with tone and more to do with how high it lets you crank up the amplifier's volume. Perfect for modern gain, these have unique a wall of sound break up, very articulate. JJ's EL34 can handle insane voltages and while their 6L6GC is listed at 450 - 500, it can go way higher. Prices on Telsa EL34's are going out of sight so I don't recommend them if value is an issue. EL34 is one of the most popular power output tubes today, and there is a large number of current production EL34 and variants. This is a warm, thick, dense tube with world-class tonality for lovers of guitar music from Esteban to Stevie Ray Vaughan. 01 4 4 1969. You might also like this HumbuckerSoup article: Power Tube FAQ: EL84, EL34, and 6L6 EL34 Power Tube. But what about 6L6's in a 730 modulator? Seem s like the 6l6's would have more meat over the EL34's. Find many great new & used options and get the best deals for 2 in 1 Tube amp bias tool Current and Plate Voltage test probe 6l6 el34 kt88 at the best online prices at eBay!. We are all things tubes, Guitar amps, Bass amps and Hifi amps. If you have an amplifier that can use either 6L6 or EL34 tubes, you will quickly notice that 6L6 tubes are more "Fender", where EL34 tubes are more "Marshall". i have a mesa dual rectifier. VERY SPECIAL TUBE. We deal in JJ Electronic tubes, NOS tubes, capacitors, speakers and bias probes. DISCLAIMER: LORD VALVE (W. Again, if the output tubes are biased cold, the amplifier will sound less warm, romantic, and good. The EL34 is a true Pentode, the KT77 is a Kinkless Tetrode. TUBES Input stage: 1x 12AX7 - 2x 12AU7 Power stage: 4x EL34 Bias control is accessible on top of the amplifier panel with true ampere meter. Self biasing is common for lower wattage < 30 watt amps, not common for higher wattage. com FREE DELIVERY possible on eligible purchases. 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. If everyone who owns one could please take a few minutes to read the number written on top of the four EL34 power tubes in their BE 100 and post them, I would sure appreciate knowing the results. This amplifier was featured on the January 2003 Issue of the "High-Fidelity Audio: Radio Technology" by Mr. Pristine Heathkit AA-121 tube amplifier with good EL34 outputs. Some people go as high as 40mA which is an 80mV reading. For this reason, tube sellers (including tctubes. Its deep as the internal hell, clear like tuned piano and makes a world of difference to enjoying music. We want you to have fun. The triode tube has two sections, and one is used for each channel. So not fully identical. If the tubes haven’t been removed for a long time, it may feel ‘sticky’ and ‘tight’. because 6Y6 and EL32 are just same IP-EP charactor. Tube Data Sheet Locator. Important Adjustment Principle: if the power tubes turn red at full intensity then the bias control needs to be adjusted for less idle current (more negative bias voltage), conversely if the Tremolo effect has little effect at full Intensity then the bias needs to be adjusted for more idle current (less negative bias voltage) the following. In 1966 Marshall switched from the KT66 to the EL34 as their power tube of choice Amp. How Vacuum Tubes Work by Eric Barbour - [Inside a Tube] - [Why are Tubes Still Used] - [Using Tubes] The BASICS. Tube and Bias Info. You can build a circuit with 6L6 tubes that crunches like an EL34 loaded Marshall if you know what you're doing. These are presently the EL34 output tubes that I ship to VTA ST-70 amp kit customers that want a matched quad of EL34 output tubes with their kits. Tube Bias Settings. A good analogy from the automotive world is the idle speed of a motor. The 6AN8 and EL34 tubes has very low hours. No, I don't have these tubes just examples. Hand selected and matched using precise equipment, they are ready to ship!. The meaning of the term 'Amp Bias' How tube amp bias will affect your guitar amp tone; When you need to have a tube amp biased; The guitar community seems to be shrouded in the mystery that is tube amp bias and in a way, it's probably for the best. The item “Vintage 1965 Fender Vibro Champ Blackface Tube Guitar Amp Nice LOOK” is in sale since Friday, October 18, 2019. The EL34 delivers a very different sound than the 6L6 because the EL34 is a pentode and the 6L6 is a beam tetrode. I just bought some 6L6 tubes to replace the EL34's in my JSX. It's a nice device, there's a quick test mode where you set the plate and screen voltage and it gives you Ia, Ig and Gm. The KT77 is often described as a pentode because it shares the same pin configuration and bias as the EL34, but that’s inaccurate. Both cathode and fixed bias methods suffer from the fact that the current depends on tube age and mains variations, not to mention the aging of other passive components. If you need a tester which can test and analyze a KT88, KT120 and KT150, 300b, 6L6GC, EL34, 6550, 7591A, 6c33c, 6sn7, 12ax7, 12au7, and many hundreds of others. Before turning on the amplifier, please ensure all the power tubes (i. Often it is a switch that can select bias for EL34 tubes, or 6L6 tubes depending which is installed. (*)These specifications are provided 'as-is', with no warranty of any kind. This tube is to the EL34 family what the Tube Amp Doctor 6L6s are to that variant: a taste of the very best at an Everyman’s price. Pentodes are commonly used in the output stage for their greater capabilities. Tadaatsu Atarashi. Triodes are commonly used in the preamp. ) Install the 6550’s and re-bias the. But you probably hate them too! The magic bounce, compression, and grind that. Power tube bias can be thought of a little like the pressure in a car tyre; too much or too little can result in poor performance characteristics and/or reduced lifespan of the part. com) often recommend a lower bias point than the stock settings in many vintage amps using EL34/6CA7/KT77 tubes. Vacuum Tube Valley did an EL34 report in their issue #2, Fall of 1995, but didn't get into listening tests. The fixed bias for vacuum tubes schema is given in Figure 11. Tube and Bias Info. impart additional vintage flavor and flare with your amp. With the varieties of different brands and vintage versions of this tube type, tube rolling for this amp is going to be very rewarding and fun. A good analogy from the automotive world is the idle speed of a motor. Each pot controls one EL34 and one 6L6, not pairs, unfortunately. See here for instructions on how to do it. In the case of this amp with EL34's I would personally bias the power tubes around 30 mA. The 5150IIIS 100S EL34 Head is complemented by the 5150IIIS EL34 412ST cabinet. 7 * 25/400) = 44mA. 6CA7 was also made in Nis, Serbia but in bigger glass envelope of PL509/PL519 tubes and with slightly bigger power dissipation ratings. I would like to thank Tejas tubes Technical Department for testing and checking my tubes for the best quality. This was using 6BM8 tubes, change the tube type and data but follow the same steps: Plate dissipation calculations as follows: 1) Measure the bias resistor (with the amp off & the resistor "cold") for ACTUAL resistance, write that value down. Derrick, what kind of tube amp are you using that puts out 256 wpc (I may have misunderstood what you stated)??? Auto biasing is a very useful feature, especially for owners who are not technically inclined. Electro Harmonix EL34. For the tubes, I decided to use some KT88. The numbers on the base of this JJ EL34 represent the matching measurements. Real potted transformers wound in our own factory. There is talk of setting the bias "cool" or "hot" and the effects on output valve life. Stock you should have a value of around 60mV = 60mA = 30mA per tube. Back in 1904, British scientist John Ambrose Fleming first showed his device to convert an alternating current signal into direct current. The NOS tube is a cool biasing tube, it tests strong and looks good with just a couple minor base scratches, $59. Are you looking for the very best tubes for your vacuum tube amplifier? This is the place to start. X5 brings tube biasing to a great level of ease, with just a flat-head screwdriver needed. The subject of output tube biasing has many otherwise rational men arguing amongst themselves like little school children. You can not get as much power from the amp using 6L6 or EL34, if it is even possible to use these tubes. Circa Mid 1970s. 01 3 3 1969. The EL34 is a high output pentode tube as opposed to other output tubes like the 6L6 and the 6550, which are beam tetrode tubes. The KT77 is often described as a pentode because it shares the same pin configuration and bias as the EL34, but that's inaccurate. We deal in JJ Electronic tubes, NOS tubes, capacitors, speakers and bias probes. And "tube rolling" in PrimaLuna products is easy because we run the tubes easy and Adaptive AutoBias means no manual bias adjustments. This technique is generally referred as cathode bias or self-bias. The idea is to get the tubes down closer to the ideal 65-70% range of maximum plate dissipation (25w x 65% = 16. Fantastic sounding amplifiers. I realize same brand 'matched' power tubes are what is used exclusively (it seems) I've not really heard of anything else. This information is for reference only. electronics) submitted 22 days ago by GlacierAmps. Especially striking is the large output-power capability of the Super-Pentode (circuit 5), delivering up to an unusual 80W with only two EL34 tubes. In the example above, the tube is an Electro-Harmonix EL34. EL34 World Tube amp building information The EL34 World Tube amp Library of information Click the link above for Tube amp info, Tube amp schematics, Tube amplifier circuit board building information, tube projects, Amp mods, Tube amp transformer diagrams, Photo's, Sound clips. Of course, there are always technical details that complicate things. Reviews of the Top 5 Best Tube Amplifiers GemTune X-1 Class-A Tube Amplifier with 5Z4P*1, 6N9P*1, EL34-B*2. Jim Jones' Bias Tables EL34 - 25W. GemTune GS-01 Hi-Fi Tube Amplifier, 110V Output Voltage, Tubes: EL34*2 + 6N8P*2 +5Z3P*1 , Hi-end Tube Integrated Amplifier, Single Ended, 100% Handmade, by Gemini Doctor On Sale* , bose cinemate digital home theater speaker system , GemTune GS-01 Hi-Fi Tube Amplifier, 110V Output Voltage, Tubes: EL34*2 + 6N8P*2 +5Z3P*1 , Hi-end Tube Integrated Amplifier, Single Ended, 100% Handmade, by Gemini. 6BQ5/EL84's and 6CA7/EL34's are rated for 300K, but given the sometimes poor quailty control in making tubes these days, even these types should be kept to 100K. 4 and on tube 2 it is 83. A real three grid pentode, no beam pentode like 6L6 or KT66. Tung sol says,"The Tung Sol EL34B is a higher impedance EL34 tube design with increased touch responsiveness and a unique clipping characteristic with a hint of the 6L6 sound. 6550 and KT88 tubes. Octal power tube (Max Plate Watts = 25W) Sensational new high-gain EL34 tube with a very dynamic tone. Not familiar with biasing a tube amp are there hard and fast rules or do i need to bust out a multimeter to make the adjustment? Not sure if it's a switch (liek a mesa) or a POT I need to adjust. Mullard EL34 Vacuum Tube Quartet Platinum Matched tube burn-in period followed by a state-of-the-art computerized bias (plate) current measurement in milliamps to. 2 Cathode bias or self-bias for vacuum tubes Negative voltage between grid and cathode can also be obtained by connecting the grid to ground voltage and by elevating the cathode voltage. X5 brings tube biasing to a great level of ease, with just a flat-head screwdriver needed. In end, they rock. " Martin Buffone. The switch is there because most all 6L6's naturally draw more plate current than EL34 type tubes do. almost same 6. That can get expensive as my Primaluna Dialogue HP Premium integrated has 8 power tubes. The tubes are tested and biased on the bench prior to packing. time for new tubes?. Its deep as the internal hell, clear like tuned piano and makes a world of difference to enjoying music. After I biased the EL34's to 35ma, the 6L6's were only 17ma. 19 September 2014. An authentic remake of the British Mullard EL34. Victory has a wide range of compact guitar amplifiers from the acclaimed VX The Kraken to the Richie Kotzen signature RK50. You might also like this HumbuckerSoup article: Power Tube FAQ: EL84, EL34, and 6L6 EL34 Power Tube. Conservatively rated at 10 watts per channel (average listening level for our Audio Nirvana full-range speakers is 1/10 of a watt). What i miss is a convenient chart where i can find what values are expected for a "good" tube and that i could print and put on my desk wall. The 1st version was introduced in 1987, 10 years later a newer version was launched. If the plate load impedance is not known, setting the bias to 70% of the maximum allowable dissipation is usually a safe spot for a class AB amplifier, as shown by the graphs. Under-biasing can damage your tube amp and, since the current it applied too low, it can cause a thin sound and a slowly fading audio signal. The Mullard EL34 (6CA7) were used in push-pull ultralinear with cathode bias from separate cathode resistors. VERY SPECIAL TUBE. Check out DrTube[0] for additionnals data. (6 or 8 Tubes) 6L6GC, 5881, EL34, 6550B, KT88 B+, bias, operating points, etc. We want you to have fun. You should only gently rock the tubes in case excessive force will break the center guide pin. 6CA7 is the US equivilent of the EL34. Easily beat dynaco and all chinese competitors. This is also related to the matching of the valves. Jim, to set the bias you will need a multimeter. How to Bias a Tube Amplifier. The EL34 tubes are NOS so I don't think age is an issue. POWER TUBE BIASING (Note: Biasing should be left to a qualified technician due to the fact that lethal voltages near 500 volts are present inside the amplifier). Conservatively rated at 10 watts per channel. JJ's in general are described as "dark" sounding (not as rich in the high frequencies as other power tubes). How many tubes share the same cathode resistor? (typically 1 to 4) Voltage measured across cathode resistor: Actual resistance of cathode resistor. Voltage goes up to 400v. The item “Vintage 1965 Fender Vibro Champ Blackface Tube Guitar Amp Nice LOOK” is in sale since Friday, October 18, 2019. Other than little amps (single 6V6 and EL84 amps) almost without exception Power Tubes are Grid Biased. With multiple tubes sharing the same cathode resistor, this calculator assumes the tubes are fairly well matched. You might also like this HumbuckerSoup article: Power Tube FAQ: EL84, EL34, and 6L6 EL34 Power Tube. ) will change optimum plate to plate load. 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. There are other classes such as class C, which shift the grid bias even more to the left. China-hifi-Audio online store Cayin A-88T MK2 tube EL34/KT88/6550 Integrated amplifier audiophile power amp - Cayin A-88T Increase BIAS meter indication and. It makes the amp operate as a plug-and-play device as well as keeping each output tube set for the desired. OUTPUT PENDODE EL34 is an octal power tube with a maximum plate power of 25W. I also check the bias on my tubes at least once a month. It's suitable for EL84 6BQ5 6P147189 6P1. There is talk of setting the bias “cool” or “hot” and the effects on output valve life. A screen resistor is used not so much to. " Martin Buffone. Yaqin MC10L Integrated EL34 Tube Amplifier FOR REPAIR in Consumer Electronics, To be shipped in original packaging, with owners manual and bias tool. This is a warm, thick, dense tube with world-class tonality for lovers of guitar music from Esteban to Stevie Ray Vaughan. Always bias your amplifier by strictly following your amp manufacturer's instructions. JJ's in general are described as "dark" sounding (not as rich in the high frequencies as other power tubes). Provide triode and ultra-linear selection function 8. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc. Refer once again to the tube data sheet shown previously. EVH 5150 III 50-watt 2x12" Tube Combo Amp with EL34 Tubes 50-watt, 2 x 12" 3-channel All-tube Guitar Combo Amplifier with EL34 Power Tubes, Resonance Control, Effects Loop, Headphone Jack, Preamp Out, and MIDI Input. com) often recommend a lower bias point than the stock settings in many vintage amps using EL34/6CA7/KT77 tubes. Not that you even need to. Since these multimeters cost less than some of the parts used in this amplifier, it makes sense to use more than one. The KT77 is in fact a tetrode, but with the same base and biasing as an EL34 tube so they can be substituted in any EL34 amp. Electrically comparable, and can be fitted in most EL34 circuits, but it may need some minimal tuning to get the correct bias. It will sound good, but the tubes will only last a few hours. With these type of amps (like many 6BQ5/EL84 and 6V6 based amp), you may just replace the old tubes with new ones and forget about any bias changes. got it there with about ~-31VDC on the grids. Pristine Heathkit AA-121 tube amplifier with good EL34 outputs. 6L6GC's draw more natural plate current than EL34's. bias well and last a long time. The EL34 is a true Pentode, the KT77 is a Kinkless Tetrode. 5 W rms when use 6L6 family. Bias these tubes hot for best results. I've just ordered some new quads of EL34's for my highly modded dynaco st-70. 19 September 2014. tube's lifespan and ensure the amplifier is not damaged. 34L tubes (no matter who the manufacturer is) seem to be bass heavier than their EL34 counterparts. Review: The Tungsol EL34B is likely to become the #1 choice of currently produced EL34 tubes. Power tubes are one of three types of tubes you might find in your amp. same time can be use 6Y6 SE. The triode tube has two sections, and one is used for each channel. Turn on your power amp and let the tubes get warm (3-5 minutes) read the bias. It has an international octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits and was designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. The EL34 is found in the most well-known UK heads, such as Marshall, HiWatt, and Sound City. Gallery Biasing a quad of EL34 power tubes in a Garnet guitar amplifier (self. Class A Single Ended operation represents the simplest and purist circuit possible. Highly likely that you would need to re-bias switching from EL34 to KT77. Its deep as the internal hell, clear like tuned piano and makes a world of difference to enjoying music. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. Mullard reissue EL34 tubes. VERY SPECIAL TUBE. YAQIN MC-13S EL34 6CA7 x4 10L Vacuum Tube. Two EL34 power tubes, two 6SL7 small signal tubes, and one 5AR4 rectifier. The right-most tube is an EL34 pentode. EL34 Push-Pull 2. This design allows for individual adjustment of each output tube bias. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. Class A 'Single Ended' operation represents the simplest and purist circuit possible. Octal power tube (Max Plate Watts = 25W) Sensational new high-gain EL34 tube with a very dynamic tone. VERY SPECIAL TUBE. Gallery Biasing a quad of EL34 power tubes in a Garnet guitar amplifier (self. I tested 5 different sets of EL34s in a Marshall 1987x Reissue head and Marshall 4x12 cab (circa 1977, loaded with G12H 30-watters). Written by. I will try to modificate from EL34 Triode connection SE Amplifier to EL32/EL2 Single Ended Triode connection Amplifier. Some folks who've used EL34's in these amps say they get better tone out of them by installing a variable bias control (the stock bias voltage on most Ampegs that use 7027, is a bit lean for EL34's), and by changing the screen resistors to 1,000 ohms instead of 470 ohms. For this design, I decided to use some EL34. Western Electric - $1,750. EL34, KT66, KT88, 6L6 I broke down and added another power tube (Tung Sol 7581a) to my collection. Turn on your power amp and let the tubes get warm (3-5 minutes) read the bias. Most capacitors and diodes replaced as upgrades. Unusually, this is not an Ultra-Linear (UL) or beam-power amplifier. (30 seconds) Specially designed EI transformer for power supply Two EI output transformers with wide bandwidth are applied. With multiple tubes sharing the same cathode resistor, this calculator assumes the tubes are fairly well matched. hotlicks2go wrote:30mV - 38mV would be suggested for EL34 but the amp doesn't have bias adjustment without changing resistors. com FREE DELIVERY possible on eligible purchases. View our Tube Biasing Tutorial online. JJ Electronic - Vacuum tubes, Capacitors, Amplifiers. 2 days ago · You can test a large number of tubes for plate current above 50ma. CeriaTone has classic circuits to offer, as well as custom made to clients' specifications. An authentic remake of the British Mullard EL34. All of these factors also have an effect on signals passing through the tube, in terms of gain and distortion. other than that, i know absolutely nothign about tubes or what i should be looking for in them. Class A Single Ended Amplifier to reduce distortion;To protect the amp,tube and machine are packed individually. The negative of PS 1 is connected to ground. 01 8 8 1969. the schematic Marshall EL34 Tube guitar amp bias adjustment mod D-lab Electronics Features 100 watts - w/ half power switch Channel 1 (clean) - independent EQ along with a working amp and schematic --this amp is well worth your time and love. 5881's are a direct swap for 6L6's only. With the varieties of different brands and vintage versions of this tube type, tube rolling for this amp is going to be very rewarding and fun. Yaqin MC10L Integrated EL34 Tube Amplifier FOR REPAIR in Consumer Electronics, To be shipped in original packaging, with owners manual and bias tool. 01 4 4 1969. The 1st version was introduced in 1987, 10 years later a newer version was launched. This new blue glass 6SN7 has rich tonality and big sound stage. Beam tetrode. " Martin Buffone. There are numerous output tube substitutions that will work in the Express, though the bias may have to be adjusted for best performance. What is the difference between el34 and el84? The EL84 vacuum tube is a modified version of. Voltage goes up to 400v. Power Tube Data RAM Power Tubes are tested for the following parmaters at screen voltages of 300, 350, 400 and 450 volts to allow the use of the data for any power amplifier. There's exceptions, but that's the norm. The front panel of the amp is a VU-meter lookalike that negates the requirement of a multimeter. The JJ Electronic E34L adds more power to a standard EL34 due to its higher grid voltage rating. 6 hours ago · Features: Bypass or power amp setting, Switching from EL34 to 6550 tubes. Bias probe for indirect measurement of quiescent bias current of a tube. Use this tool at your own Risk. EL37 MULLARD ENGLAND (The EL37 are sonically between a EL34 Mullard and GE 6L6GC; strong and punchy with good richness and complexity in the midrange, probably the best 6L6) - Dared VP-20 amps Customer Comments: ----- "Just wanted to follow on our conversation yesterday on the Mullard EL37's you sold me. This is especially important when the circuit is a fixed bias circuit and the tubes are operated at or even a little beyond their maximum ratings. I'm posting this for other users that encounter the same issue I did when I switched to EL34 power tubes. Page 1 of 2 1 2 Next > titan7 Active Member. If you want the mid-scoop high end sparkle and more headroom that a 6L6 afford, use a 6CA7. Refer once again to the tube data sheet shown previously. Tube Bias Calculator Instructions & Help. 01 5 5 1969. switched them around to see if tubes or sockets and the readings moved with the tubes. In the hybrid AB amplifiers, four EL34's are generally used for a 100W head such as a Marshall. Each pot controls one EL34 and one 6L6, not pairs, unfortunately. The 6550, kt120 and kt150 tubes do give off a lot of heat. Matching power tubes for equal current draw is important for maximum performance. It is a long page, use your scroll button and scroll down the page to see it all. The KT77 is in fact a tetrode, but with the same base and biasing as an EL34 tube so they can be substituted in any EL34 amp. Matching Tubes. I really cannot imagine anyone with a tube amp not doing that but then again, stupidity comes in many forms and degrees. Left unchecked, we risk not only blowing a tube, but risk damaging other components of the amplifier. 95 or you can purchase a full kit from SRS. PS 2 produces the needed grid bias voltage V g. They run the tubes so hard you are forced to stay with the factory supplied tubes. You should only gently rock the tubes in case excessive force will break the center guide pin. I presume that the Series One 200 is some kind of ultra-linear circuit arrangement in order to get 200 watts from four KT88 output tubes. EL34 power tubes are plentiful and generally, not that expensive. Select the Tube Type from the scrolling list. The subject of output tube biasing has many otherwise rational men arguing amongst themselves like little school children. The tube data is available on the New Sensor website. But before you. The World's most musical EL34 tube known for it's pronounced liquid midrange. Jim, to set the bias you will need a multimeter. Here is the email from Tranyor: While it is safe to install EL34s in a YCV80 (or YCV40 for that matter) the bias point needs to be adjusted to optimize it for the EL34s. on ALL Cabinets, Mojotone Speakers and Pickups! Use code: Rocktober19. 5Watts, each pair is positioned above the chassis in a single white tube adjacent to the output valves. Reisong Boyuu A10 EL34 Bube Amplifier HIFI PCB version is a standard version , with 2x output transformers size 66x36 Handmade version is a Luxury version , with 2x output transformer size 76x40, inside components are soldering by hand, easily to upgrade Handmade without tube version is same than Handmade version, but without power tube el34 and rectifier 5z4p, but the preamp tube 6n2 is. However, if your Jolida is currently designed for 6550's, can you replace them directly with EL34? I would have thought that tubes compatible with 6550's and the like are ok for direct swapping, but with EL34's it may require circuit modifications. About 50 ma is right when in an ST-70 which is. The physical size seems affect the tube's frequenzy response. The DCM uses a. Further to this, all our '34's are fully burnt in before dispatch, making them ready to plug and play (bias not withstanding) We hope you enjoy our choice of EL34 Each tube is scrupulously tested and only the best get badged with the Brimar thermionics logo. The 1st version was introduced in 1987, 10 years later a newer version was launched. Grid Bias, Fixed Bias, Set Bias, Adjustable Bias and Negative Bias are synonyms. Both are British tubes. 6P31S / 6P31C = EL36 = 6CM5 tube. 5 mA / V, what is its internal plate resistance? Rip = mu / gm Rip = 10. Power tubes are generally biased as a matched set of four (like in most 100W amps), or as a matched pair (like in a 50W amp). I think overall EL34 is a better sub for EL37 than 6L6 is, I have a tube sub. The EL34 is a thermionic valve or vacuum tube of the power pentode type. 6550 and KT88 tubes. Option T5 tester does not include probes. The octal and noval probes are also sold separately so. One bias screw for each four tubes, you need the tubes in matched quads. The TS100 can be set up to use either EL34's or 5881's (6L6GC) in each channel. You should only gently rock the tubes in case excessive force will break the center guide pin. EL34 / 6CA7 / KT77 Tube Reviews.