As can be seen, the design of the seamplifier is simple. Willsenton r35i el34 x4 tube amplifier headphone amp with bluetooth basic meter red without bluetooth 5. The first two things to consider when beginning to design are. Vacuum tubes wear out due to heat and high temperature. There are hundreds of pages of tube amp information on my library page. It is heavily based on a bassman plexi preamp with some tweaks. Ever wanted to build a highly dangerous, inefficient. This amplifier was later used on the 17 output transformers sound comparison on the el34 pushpull monoblocks featured on the tube kingdom 2003 winter issue vol27. Shows you in a simple way how to go from schematics to a finished amp once you have decided on the design approach and have a circuit diagram in your hands, the real work starts. It have to be experienced as a description is far from enough compared to feeling it in your chest. When pushed, mullard el34 delivers smooth creamy overdrive.
Sound clips page tube amp sound clips and tunes of all types. I agree, 3k4 is a better match, but 3k8 would be better still. Not to say it wouldnt be good in some situations, but i think the typical single tube class a amp in production today is aimed at people wanting little 5watters to practice with. Why not a class a amp with one 6l6, or one el34 the gear. If you have a marshall amp and find el34s too compressed and 6550s too crunchy the jj kt77 may be just the ticket. Evh 5150 iii 50watt 1x12 tube combo amp with el34 tubes demo 50watt, 1 x 12 3channel alltube. X5 stereo integrated amplifier el34 x4 tube amp pushpull with remote upgrade. Apr 18, 2017 el34 single ended 2x8w tube amplifier. These are important questions because they will dictate the choice of output valve which itself will dictate the design of the rest of the output stage and power supply. Design your own custom turret board or eyelet board.
Find a barn, rent a rehearsal room, book a gig or do whatever you have to do to experience powertube influence over your preamp settings. In case your amp has a bias tap on hv winding in pt or a separate bias winding a simple voltage doubler is a good solution. Note that the 6ca7 el34 vacuum tube is, in actuality, a pentode tube, although it is shown in the schematic as a tetrode. The clear and harmonic open top end allows for great clean tone and at the same time the tad el34bstr offers incredibly powerful mids and equally powerful bass.
Tube amp design wikibooks, open books for an open world. To protect the amp,tube and machine are packed individually. 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. The following guidelines should be taken into account.
This guide discusses all relevant aspects for an integrated pushpull vacuum tube amplifier design, including the power supply unit. When pushed, el34 will produce wonderful quintessential classic marshall tone thats instantly recognizable. Universal loadline calculator for vacuum tubes vacuum. The tubes that readers ask about most often are the el84, el34 and 6l6. An easily constructed highquality singleended 8w amplifier using standard valves and the lundahl ll 1664 output transformer claus byrith 2002. High voltage winding is actually around 350 volts on these as measured, though label says 400 volts. Using el34 on a 6l6 transformer isnt going to net you the same output power, but the tubes shouldnt mind. The empirical approach used in il primo was replaced by a more rigorous approach in il primo bis. To protect the amp, tube and machine are packed individually. In this video i do a tone test demonstration of my new single ended el34 based tube amp that i built. More specifically, its design is precisely discussed and described in step by step design of a pushpull tube amplifier. Nobsound vacuum tube amp amplifier plate bias current probe tester 8 pin socket for el34, kt88, 6l6, 6v6, 5881, 6550, kt66, kt100, kt120, 7027 ct1p, plate current 3. I have several homebuilt amps running hammond 164x and 165x transformers and el34 tubes.
Keep in mind, that by using pedals, you can make one amp sound pretty much like any other one, so this discussion is focused on how a few of the most popular power tubes differ from each other when using the amp, and not the pedals, to get your sound. Due to its narrower profile, el34 tubes can run quite hot and tend to. This book, in print from 2008 until 2020, has been updated, expanded, reorganized, and replaced by guitar amplifier electronics. When searching for a amplifier design to follow, i came across a good paper. A finished amp once you have decided on the design approach and have a circuit. The amp runs at 450v and i cant get the bias down below 40ma. Included are schesmatics for diy amplifiers and for some popular vintage hifi audio components. El34 produces smooth highs with pleasant mids in guitar amps. Mullard el34 has smooth, warm mids that is the hallmark of el34 tone, and then some. Tube amp information, guitar amp schematics, tube amp. This amplifier was featured on the january 2003 issue of the highfidelity audio. If you are looking for the last word in tube amplifier design, this probably isnt it. Other common substitutes for el34 vacuum tubes are 6ca7 and kt77 tubes.
Whats the best el34 amp besides 8b i am looking for a tube amplifier with 4 tubes of el34 pushpull. You can browse and read the full text of the book for free. Marshall tube amps are the most wellknown el34 tube guitar amplifiers but there are many others who arrived on the scene in later years. This free guide discusses all relevant aspects for an integrated pushpull vacuum tube amplifier design. Covers tube theory, tuned and untuned amplifiers, oscillators, and power supplies. Description 2 x 12w tube amplifier with el34 and dynavoice dm6 loudspeakers. With triodestrapped el34s use hazen mod youll get 67 w out of the amp. Vacuum tube el34b, tube amp doctor antique electronic.
El34 excels at reproducing horns and female vocals, with silky smooth texture. Atarashi was also amazed by the very detailed sound images that this amplifier can recreate. It includes many graphs to help make the material easier to understand. This is where the magic of tubes and mesa amps really happens. Find a barn, rent a rehearsal room, book a gig or do whatever you have to do to experience power tube influence over your preamp settings. Oct 11, 2011 the largest difference from the transistor amplifier to the el34 tube amplifier is the bass.
Tube amplifier projects vacuum tube amplifiers diy. El34s is an economical method to achieve high quality sound with a minimum of driving stage components. Our website and phones are open, but shipping may take a few extra days, for the safety of our team. With a volume and single tone control this amp really lets you hear the tonal differences between the tubes. The jcm800 power amp follows a long lineage of classic amplifiers that include the fender bassman 5f6a, the marshall jtm45, the model 1962 bluesbreaker, and the model 1987 plexi. If you are interested in mullard tubes, most notable being the ef86, el84, and el34 then this is the book for you.
In a el34 guitar amp, mullard el34 provides balanced clean tone and textured crunch. This is a true single ended class a amplifier, using a 5y3 rectifier and a single 5691 preamp tube. How to build a tube amplifier rob robinettes car and tube. 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. Ive been experimenting for years working to find the right mix of good sounding and reliable el34 tubes to stock here at the shop. Here, i tried to use a more formal and rigorous process to the design and value settings of the various parts of the amplifier. Instruction book for specimen single ended stereo tube amp 62718. The free shipping option allows tubedepot to choose the most appropriate carrier and service. The most common tube type in audio amplifiers regardless if it is in power stages or in pre amplifiers is the socalled triode svwp. Single ended triode set tube amplifier schematic from the book build our own audio valve. Petersburg, russia, and is designed to be a direct replacement for any el346ca7 or equivalent. Vacuum tube circuit design guitar amplifier power amps. Mar, 2015 ben verellen of verellen amplifiers talks about how he got started designing his own tube amplifiers and what some of his favorite tone circuits are. Jones has a companion book called building valve amplifiers which covers all of.
The svetlana el34 is manufactured with the original mullard design in the svetlana factory in st. Among amplifiers employing two el34s per channel in pushpull, i suspect that a pair of marantz 2 monoblocks in good condition would outperform an 8b. Based on the mullard 520 design with 30w out per channel. In audio amps, el34 tube produces that signature velvetsmooth mids. Cheap valve tube amplifier, buy quality class a tube amplifier directly from china tube amplifier suppliers. A visual tour its fairly technical but its the only book written specifically about guitar. Also here, i designed it using the approach described in my book. The valve wizard single ended how to design valve guitar. How to convert a bunch of interconnected symbols into a wiring. Anybody have any suggestions other than return the tads and find new tubes. If you own an el34 amp, you know the magic it produces.
He concluded, this is beyond the audio reproduction too close to the real sound. The schematic is from the book build your own audio valve amplifiers by rainer zur linde. Hoffman amplifiers tube amplifier forum index el34 world. An easily constructed highquality singleended 8w amplifier using standard valves and the.
The phasesplitter is a very critical part of the pp amplifier, and its behaviour is of great importance for the performance of the amplifier. Jan 20, 2018 description 2 x 12w tube amplifier with el34 and dynavoice dm6 loudspeakers. In hifi el34 amps, mullard el34 is all about velvetlike mids. As a diehard el346l6 tube addict, i could not imagine living like hans gruber, on the beach, earning 20%, without a little musical paradise mp301 amp by my side decked out with el34s or 6l6s. Maybe most of the el34 amps ive heard are less musical to our ears than the kt6670276l6gc type of amps. Mesa amps sound great at lower volumes but every amp is tested and designed more specifically for use in professional applications. Classa stereo pushpull vacuum tube amplifier pp tube amp design and construction of a pair of pushpull classa, ultralinear mono block tube amplifiers that can be used with several different power vacuum tubes including cant wait to build this el84 pp tube amp see more. Beside that, el34, el84, and 12ax7 vacuum tubes are used in many practical examples, to design the various parts of the circuits and to compute the values of the needed components.
The last one i had to run 520v on the plates to get my 50watts out of a pair of el34. Book depository books with free delivery worldwide. But tbh the output tube is only a small part of an amps performance and since the el34 is an affordable tube youll rarely find commercial el34 amps that are really good. Its deep as the internal hell, clear like tuned piano and makes a world of difference to enjoying music. The bottle is a bit wider than some el34 tubes and is big enough for a 6l6. Edcor transformers, hammond choke, tad el34b str premiums, two 12au7s and one 12ax7. Champs can be modded to accomodate an el34 but they put out 1215 watts, which is a heck of a lot of power. It has substantially more power supply filtering than any of its ancestors, which contributes to a slower, more sustained dynamic as the amp is overdriven. Fundamentals of guitar amplifier system design book. The clear and harmonic open top end allows for great clean tone and at the same time the tad el34bstr.
The schema of the power supply unit for the stages of the amplifier is given in figure 53. Among amplifiers employing two el34 s per channel in pushpull, i suspect that a pair of marantz 2 monoblocks in good condition would outperform an 8b. Class a single ended amplifier to reduce distortion. It uses el84 power tubes and 12ax7 vacuum tubes as input and phase split. A combined input stage and driver drives the output valve, and a transformer matches the valve and the speaker system. For additional tube amp design and construction tips, see my design and construction tips and suggestions for vacuum tube amplifiers. The circuit can be used with a variety of different power tubes without modification e. It thus has three electrodes where two of them called anode and cathode reflects the diode function of the tube according to svwp. I just bought your kindle book which i hope explains how it is possible to use cg positive values. Please make sure your post does not fit into one of the other forum categories first before you post here. See more ideas about valve amplifier, vacuum tube, electronics circuit. Singleended tubebased guitar amplifier by joe linn senior project. Resistors with names such as rgain1 and rgain2 represent potentiometers, with the node between the resistors being the wiper. The design of this stage takes skill and care as explained in my earlier paper.
The use of a single tube in the output stage of the power amplifier is commonly referred to as a singleended. View all results for el34 tube amp at sweetwater the worlds leading music technology and instrument retailer. 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. Beside that, el34, el84, and 12ax7 vacuum tubes are used in many practical examples, to design the various parts of the circuits and to. Octal power tube max plate watts 25w sensational new highgain el34 tube with a very dynamic tone. The el34 is a thermionic valve or vacuum tube of the power pentode type. An easily constructed highquality singleended 8w amplifier. The amp consists of two sections, the audio circuit and the power supply. It strictly covers mullards most popular hifi tubes and their amplifier designs of the 50s.
Maximum plate dissipation for the el34 is 25 watts, so if we bias the amp at 70 percent, we get 18 watts. What sound are you looking to get from the power amp, and how much output power do you want. Also, i have previously posted some suggestions for a tube amplifier wiring color code that you can use during construction. 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, photos, sound clips. The only exception to our ears is the vintage marantz 9 pp amp from the 60s. In the tube audio world, it was companies like dynaco, leak, and mullard among others who help boost the el34 tubes popularity. The tube design is classic el34, with the tall grey plate you would expect. Buy nobsound el34 class a singleended tube amplifier stereo hifi amp diy kit 1set.