El84 pp diy. Discussion in 'DIY' started by dBel84, Mar 14, 2021.

El84 pp diy. See full list on diyaudioprojects.

El84 pp diy. If each push-pull EL84 needs 10V peak, the self-split will need 20V peak. I have 5k output transformers made for el84 in pentode. ) However if "distortion" is of interest, the self-split is generally not the best path. Dec 3, 2023 · For this simulation I've used a circuit from NGO's previous thread, a PP EL84 driven by a common ECC85 driver circuit. Unless there is a HTregulator or a choke input filter is used. And then life happened. 5 output transformers, and a 10H, 200Ω 180mA choke. I could populate it with the highest quality parts, make minor design changes, and even replace the output tranformers with a higher quality pair, for a price of course. Below is the schematic of the auto bias. Of course, I try to never turn power off and then on again in a short time. Push-Pull (PP) EL84 Tube Amplifier Schematic Other Push-Pull EL84 (6BQ5) Tube Amplifiers. but what did I know back then? I do know that my ears were better back then. 6P14, EL84 push-pull machine for application, layer winding process, CNC drying! Vacuum dipping paint! Friends of the fever industry have a lot of controversy about the various output transformers that are processed by EI iron core and amorphous iron core. I'm straggling to make up my mind regarding output transformer. Good quality EL84's (I use JJ's) don't have a problem with this voltage on plates and screens but the cheap stuff sold on Ebay glows brightly! I am using cathode bias (12 volts) so the tubes see only 340 volts or so. Interesting showdown. They've been sitting unused for too much time so the times has come to let them go to someone else. EM 0776 PP They also have a design for 40% screen tap 15W PP transformer with 8000 Ohm P-P impedance, 8R output only. I can't see the caps you are talking about on the circuit. The Manley offerings are also nice, but I am 2-tubes/channel person and Manley doubles up on that. Mar 22, 2021 · It is a push-pull EL84 too, but two channels instead of mono. 5k or 5. So far, so good. Should mention that it's currently running the std Chinese 6P15s. Many will work, many will work very well. Im contemplating putting in the amp better OPT. Is this a good schematic? Has the ecc82 a proper gain for a input a . Wall Of Sound DIY Special Project: Thunderbirds are Go! The Tubelab. Oct 7, 2005 · Try disconnecting the feedback, it does not need it to run ok. It is hard to make a bad EL84 amplifier. The first (auto bias), which is probably the one newbies should build and a fixed bias version. be/DDLFGM6CIKE 4/02/2014 15:06:04 F:\Elec\!Tubes\!HiFi\Amps\PP\EL84\VoxDei Victrix\VoxDei EL84 PP pentode. Jun 20, 2019 · Hi, i want to build a simple el84 pp amp. Tight controlled bass even when driven solidly into clipping. I have a 8k output transformer (without UL) 2 el84 and a ecc82. Jan 26, 2021 · Amorphous C-type iron core 12W10K push-pull output transformer cattle 6P1. sch (Sheet: 1/2) triode triode triode 8K8 : 4/8ohm Novarria 300v-10v (5. Nov 26, 2023 · An EL84 PP is an extremely easy transformer in terms of HF response vs output power vs primary inductance. dave ••• Oct 30, 2024 · An EL84 PP amp based upon research borrowed heavily here, diyauido, tubecad journal, and diyparadise. Mar 14, 2021 · I am currently living with a 3. I was looking for the most simple EL84 circuit to get started and found something like this: http://www. Jun 10, 2020 · Hi Guys, I'm on my way to build PP EL84 amp based on Audio Note EL84 PP "inspired" PCB available in Aliexpress. Apr 24, 2020 · There are 3 EL84 PP that have been developed on the forum. this is interesting. From the first post by gingertube (edited): 6. 2 mA, but the margins are big (because the voltage drop over the 330 Ohm resistor could be a bit more or less than 5 V). In processbroskie inspired MOSKIDOoctal aikido front end with BUZ901 and BUZ906 MOSFETs. The tube rectified power supply uses an EZ81 tube. com Aug 4, 2022 · #1. Feb 25, 2017 · A friend of mine, Neal Haight, who has contributed many of his great ideas to this magazine, recently mentioned a lack of articles regarding what I consider to be the king of the “baby bottles,” the 6BQ5/EL84 power tube. Oct 12, 2020 · If the voltages in post # 9 are those of the channel in which one of the EL84's is passing some current, than the current draw of the 12AX7 + the current draw of the screen grid of that EL84 is about 5 / 330 = 15. diyparadise. PART 1: Cost Breakdown and Parts Ordering Information. May 25, 2019 · Try searching for Mullard 5-10 output transformers or EL84 push pull transformers. The input stage is a single 12AX7/ECC83 twin triode which is a very common tube as voltage amplifying stage in tube amp. May 25, 2019 · An EL84 in triode mode has a plate resistance of ~ 1500 Ohms. 7k Ohms. 6K 25Watt 7600 Z ohms Tubes are matched EH EL84 and Sovtek 6n1p PSU is the Push-Pull stereo integrated amplifier; Max Output Power 2x ~12W @ 1 Volt peak input signal, with 16dB global negative feedback; Power Stage: 2x 2 EL84 power vacuum tubes in Push-Pull Ultra-Linear configuration and fixed bias; Phase Split Stage: DC coupled Concertina with 12AX7 vacuum tubes Jul 1, 2013 · Hi , i'm building an EL84 PP Amp and i want to try a pentode in the front-end , since i've only 1 socket for input stage and phase splitter i would try ECF80 and i need gain to accomodate GNFB. I have the biasing LED construct for the Red Light District, but would build baby Huey next. 5v 1 8 W / 5 W R M S o u t 0. Sep 10, 2014 · Bruce Heran outlines the design and construction of monoblock Push-Pull EL84 (6BQ5) valve amplifiers. 2 watt triode EL84 Class A PP. If loop NFB is desired for UL or pentode operation, the grid of the splitter's non-inverting triode can be lifted from ground and the NFB applied to it. The base circuit is based upon one posted at Broskie's tubecad journal with a CCDA front end. So the output stage MUST behave as a differential amplifier to work properly. I have had very good sonic results. YMMV. AFAIK there are 2 major versions. . If one needs that kind of bass response, just has to increase core size\turns a bit. With that, an EL84 triode wired push pull in AB1: When one EL84 cuts off, then 1500 Ohm plate resistance drives 1500 Ohms of the output transformer 1/2 winding. Speakers are currently about 84 dB. My Aug 4, 2022 · You will find many simple push pull EL84 amplifiers (and many simple push pull 6BQ5 amplifiers). A Triode [wired] EL84 has a plate impedance, rp, of about 1. In Class A push pull, both plate rp's drive the output transformer. Apr 7, 2018 · I managed to pick up a non-operational DIY EL84 PP amp. Mar 4, 2020 · 660V CT is to much for a EL84 PP With a tube rectifier 600V CT and with si-diodes 500V CT is the max. Almost all of them could deliver about 10W. html. I have never used either. Tamura dont offer el84 OPT, hashimoto neither. These amazing little power tubes are quite efficient, requiring only 15Vpp to bring them to full output. Oct 14, 2009 · The Baby Huey PP ultra linear EL84 is a design by member Gingertube. I would love to have a higher powered EL84 amp to use with some of the less efficient speakers I own and like. Broskie inspired EL84 PP-Edcor iron-New issue sovtek 6n1p EH el84's sovtek 5ar4 recitifer-LM317 CCS for el84 cathode bias-Auricap coupling caps 7. You can also remove the bypass cap from the shared cathode resistor. For the purpose of calculating standing currents, all reactive components may be ignored, they magically disappear at DC. I used the Lundahl LL1682 OPT. All my audio projects I worked with were single ended triodes which puts out 2watts maximum. So if you want to use them and want more power, adding another pair per channel won't break the bank. And now I want to try something different. Feb 23, 2021 · SOLD: EL84 PP output + power transformers Hello, I bought these transformers a while ago for a project to build an Audio Note L1 amplifier, but never used them finally. It had 2xEL84 output valves per channel, with ECC81 and ECC82 as pre and phase splitters, and an unidentified rectifier (probably 5U4 based on connections). After reading this thread, I ask my winder friend to wind me another CT choke/autoformer with bigger core and higher inductance (around 120H each leg), it seems that this would improve my frequency response. Found these schematics on the web Oct 21, 2005 · Hello! I have built the attached circuit. I have built some push-pull amps using this wonderful, hard-working little tube, but even though they were fairly simple Jan 8, 2008 · I built a PP EL34/KT88 using a CT choke too. com/simpleel84. Jun 19, 2021 · Greetings to everyone. I would recommend one of those. Occasionally over the years I might make a little progress here or there, moving the Simple 45 from a breadboard layout into a Hammond 1444 case or making a quick something to scratch the hifi itch Oct 13, 2010 · I am using a Hammond 372JX feeding a Simple P-P board. 4V 97. Nov 24, 2020 · One good example of the triode-strapped EL84 PP output stage is the John Broskie's amp, though I'd personally would go for individual EL84 biasing and slightly higher quiescent current (680. Discussion in 'DIY' started by dBel84, Mar 14, 2021. Am wondering if anyone Dec 21, 2009 · Dynaco Push-Pull EL84 / 6BQ5 or 6V6 / 6AQ5 Tube Amp Schematic. dBel84 Friend Pyrate. The schematic calls for 8k and I need 8 ohm output, with a 4 ohm output being nice to have but not strictly needed. I have seen many many EL84 push-pull schematics, and all of them was working from about 300V supply. com, Simple Push-Pull (SPP) EL84 Amplifier. Fisher got fine hi-fi performance with a dual-triode and a team of 7189 (hi-spec EL84). I think, that's very simple, common. The EL84 (6BQ5) / 6V6 Push-Pull tube amplifier schematic and text below is from the Dynaco Super-Fidelity Output Transformers catalog circulated around 1955. Sep 6, 2014 · The push-pull EL84 tube amplifier schematic is from the book "Build your own Audio Valve Amplifiers" by Rainer zur Linde. May 31, 2006 · Hi All would like some advice on an EL84 Push pull Amp schematic As i have only built one tube SE Headphone Amp I am keen too have a go at this simple looking Amp Would like to now if its worth it for Home Hi FI is it likely to sound good and be worth doing You can see it hear image 5 The DIYparadise EL84 amp drives the output push-pull pair from one side only. There was a group buy on diyAudio recently and there are some extra PCBs around. Sep 26, 2021 · This is the last circuit I have developped around a push-pull of EL84. May 25, 2019 · Years ago, as I was building my EL84 stereo amp, I carefully did my homework for suitable output transformers. any suggestions! looking for the pair of opt under 800 USD! Aug 5, 2005 · Take a good look at Eric Kingsbury's PP 6V6 amp. "I never heard a 2A3 amplifier that I did not like" - a quote from a "Sound Practices Dec 16, 2019 · DIY EL84 Project, Part 5: Optional Volume Control and Input Switch Assembly, Power-Up and Testing DIY EL84 Project, Part 4: Chassis, Board and Transformers, Integration and Wiring DIY EL84 Amp Project: Part 2, Circuit Board and Chassis Preparation DIY EL84 Amp Update! Review: The Schiit Loki Max Equalizer Nov 26, 2023 · An Ultra Linear [wired] EL84 has a plate impedance, rp, of approximately 3. See full list on diyaudioprojects. Poor/lightweight bass performance is not acceptable. In attach the schematic: it use a 6922 with the first section at gain and the second as cathodyna. Some schematics are not tested (some of those will not work, and some of them Will work). Usually pp EL84's give about . So far, I see Tango as a serious contender. A 6k Ohm plate to plate transformer has 1500 Ohms plate to Center Tap. JE's collection of PP EL84 Ultra Linear amps Nov 11, 2017 · Been looking around for an EL84 PP amp and about the only thing out there I can find is the ANK monoblock, which, with the tube rectification, is pretty much what I want. The NTC I'm using is a 60 ohm cold resistance, and aprox 15 mm diameter. 5Vrms at full power? If i have 2 nputs, one a CD player, and the other is a Computer, which has a minor output, how Feb 26, 2013 · Finally, would there benefits in raising the G2 voltage closer to what the EL84 spec sheet says for class AB PP operation? (which is 300V B+ & 300V G2). By Steve Graham. You’re not doing THAT with a push pull EL84. . It probaly is a few ohms when hot. Jan 30, 2021 · I've built one channel of this amp PP El84 It sounds very fine, but I've a strange problem: I noticed by observing the woofer that the cone "breathes" (this term is not very technical but it gives a good idea), that is, it oscillates slowly with a constant excursion of 2-3 mm with a very very low frequency I would say, by eye, about 1 cycle per Oct 27, 2021 · I think el84's sound better also. Solid bass performance required to 20Hz. I am fine (unless i want to crank it — rarely) EL84 is a very nice output tube. Initially, I have an CT choke/autoformer with 10H on each leg and it worked fine. Rated 15 watts (or more) I suppose. The Mini Block tube amplifiers use a 5751 in the driver position and the EL84 output circuit is biased into Class-A, ultra-linear operation. The damping factor at that point is near unity (1). 8K - 10K PP with triode connected EL84 and have noted only very small differences in performance with real speaker loads and indeed on the bench as well. Audio Note Push-Pull 8K 15W for EL84-ECL86-6V6 (TRANS-200) - Audiokit Nov 26, 2023 · Cranking to rave levels with solid state - full power at 20 Hz is a side benefit of amps that don’t have other gross problems when being used for that sort of duty. To cause diff-amp behavior, there has to be a large tail resistor at the EL84 cathodes. My B+ is 357 volts. 750R+100uf for the each cathode instead of those 400R+1000uf common ones). I’m looking for something economic, but not disappointing. Easy to build May 25, 2019 · Baby Huey GB PCB - EL34 Build Thread I plan to build 2 Baby Huey stereo (BH) EL84 amplifiers, first to use a pair of these Toroidy outputs, second with a pair of Acrosound 310 output transformers (the best vintage EL84/8400 Ohm OT’s I know of). The layout and the way you have built it may be contributing to the oscillations. It looks like a clone of the ANK Audiokits L1 EL84. I would love to build a PP amp, using EL84 tubes. poseidonsvoice Mar 13, 2020 · Hello guys, Imlooking for a good single ended EL84 schematic. EM 0775 PP Feb 5, 2008 · I've used output transformers with primary Z of 7. And pentodes are treated as triodes, at DC the OPT contributes only resistance. It sounded Wonderful, . Stuben ••• Nov 2, 2024 · An EL84 PP amp based upon research borrowed heavily here, diyauido, tubecad journal, and diyparadise. Nov 26, 2023 · I'm looking for recommendations for ouput transformers for an EL84 push-pull amplifier. The grid stopper resistor R g, generally used with an EL84 vacuum tube, is 1K Ohm. There is a LOT of food for thought in that design. Even then I doubt full power 20 Hz capability in the OPT is necessary. Mar 27, 2022 · I can recommend the Tubelab Simple PP. Then the output stage with fixed bias and a pentode connection ( my preferred). They were built by a famous Hungarian transformer builder. The chassis is Hammond 12X8X2 Iron is all Edcor: XPWR 007 CXPP25-MS-7. Sep 6, 2014 · Push-Pull (PP) EL84 Tube Amplifier Schematic with ECC83 input stage. There are so many options and I cannot make up my mind. But first define simple. 4V 5 0 K 3 3 K 2 W 3 3 K 2 W 2 2 0 K 2 2 0 K 2K2 1 0 R 1 W 1 0 R 1 W 220R 1W 220R 1W 470R 3 3 0 K DN2540 10M45S 1 0 0 R 1 0 0 R Red line represents the push-pull loadline with an 8K Ohm push-pull transformer and bias current set to 28mA. Can anyone help me in finding some tested shematics? Thanks a lot Aug 24, 2021 · If you are experienced (and you can find a set of PCBs) build the Baby Huey EL84. Built point to point soldering. We built a variation on El Cheapo (triode Class A) and it is stellar. Nov 26, 2023 · Edcor USA has a 25% screen tap 15W PP transformer with 8000 Ohm P-P impedance, 8R output only. The DIYparadise schematic shows just a 135 ohm resistor, which in my view, is inadequate. @madabouttubes- This is demo of a previous video about my DIY EL84 PP Tube AmplifierLink of my previous video: https://youtu. For the phase inversion stage, we specially make use of a pair power pentode EL84 to achieve good dynamic range and speed. (5AR4 rectifier 2 X 12AT7 and 4 X EL84). Am I missing something or is that website missing something or is it really possible to build a working PP amp with one OPT, two resistors and a pair of EL84? Has anyone tried it? What's going on here? Dec 15, 2007 · The tube amplifier project uses EL84 / 6BQ5 valves in a self-inverting push-pull topology with a 5751 SRPP driver stage. EL84 datasheet specifies Dec 3, 2023 · A year or so down the road, if I decide that I really like this little amplifier, a new circuit board can be had for only $11. But my circuit delivers only 5W undistorted. Have built some amps, a couple of el84 pp, but I did not like the sound I got from them! But then I found the schematic of the Tubelab el 84 PP, built the amp, , and the amp sounded just fantastic. It has some nice vintage iron - an Engel 350V transformer, two Partridge 8000:3. For full details see the PoddWatt class-A stereo EL84 (6BQ5) tube amplifier project page. 5751 SRPP / EL84 (6BQ5) Self-Inverting Push-Pull Tube Amplifier; ECC802S SRPP / EL84 (6BQ5) Self-Inverting Push-Pull Tube Amplifier Mar 26, 2011 · EL84/6BQ5 Push-Pull Power Amplifier Few tube amplifiers sound as sweet as two triode-connected EL84s in push-pull. 3 mA) (6mA) 100v 0. I would think most recycled EL84 UL/Pentode output transformers will provide more than adequate service in triode connection. , are readily available. The LL1663 will also work. The Aikido is wired all P2P and I made PCBs with toner transfer method for the MOSFET stage. I believe that is the most sophisticated and best sounding EL84 PP right now*. Apr 12, 2020 · I was able to build a JE Labs Simple 45 and also lay the plans (and buy parts) to build some kind of PP EL84 and a SE 6550. But there is not a go-to source for help - it is up to your research of a long and sometimes wandering thread: EL84 Amp - Baby Huey. Consequently there are several BHs being built right now, including mine, so help, advice, BOM, etc. I didn't go into messing around with opinions, and I wanted a transformer that naturally performed with as pure and undistorted output as possible. I will be happy with bigger power. Nov 26, 2023 · Back in 1959, I built my first Knight Kit EL84 push pull mono block amplifier, and listened on an Electro Voice 12 inch Wolverine "full" range driver. Mar 14, 2021 · EL84 based PP amplifier: Baby Huey EL84. Why? What did I Apr 2, 2010 · It is EL84 or 6BQ5 class AB push pull circuit. 6K 25Watt 7600 Z ohms Tubes are matched EH EL84 and Sovtek 6n1p PSU is the Oct 24, 2018 · hi everyone! Long time Ok, I have a EL84 ANkit with stock OPT ANK Audiokits - L1 EL84 Integrated Amplifier I want to put into my amp better OPT. There is more information available about tube power supply design in the Power Supply Design for Vacuum Tube Amplifiers article. Jan 22, 2006 · PP EL84 OPT impedance I just finished a PP EL84 project using IT coupling/invertering. Jan 15, 2020 · DIY EL84 Amp Update! Posted on 2020/01/15 by Steve Graham in Amplification, DIY, Tubes // 3 Comments. This OPT has a 5k primary inpedance. 6k based on the Ultra Linear tap percent, 40% or 26%, respectively. A good one can be REALLY good. The intention was to make a simply solution with a very good OT trafo. As you are UK based, Primary windings (Building the Mullard 5-10 Amplifier – Primary Windings) and VVT (VTP12925-1100 - Mullard 5-10 PP UL Output Transformer EL84 10 Watt 6600 ohms/valve) both do suitable ones and are in the UK. Baby Huey, El Cheapo, and The Red Light District. We also use a 1K Ohm screen stopper resistor R screen to connect the EL84 screens to the ultra-linear taps of the transformer. (Still not in grid current. anyone have suggestions for OPT? Tango seem to have great EL84 OPT, dont think tamura does nor hashimoto. A quad of EL84's cost about the same as a pair of EL34 types depending on brand. Oct 14, 2017 · I have the stock EL84 L1 ANkit integrated it comes with the stock blakc OPT. 7% distortion without feedback. Feb 20, 2022 · Anyone has assembled the copy of AN EL84 board below? Stereo Push-Pull EL84 Vaccum Tube Amplifier PCB DIY Kit AUDIONOTE?Just wandering about the sonic character and if there is enough gain to use as an integrated amp Apr 12, 2020 · One of the top-notch current EL84 PP designs is the “Baby Huey” amplifier. The simplest push pull ones are probably the self inverting amplifiers. fqnhh ifhw dsbhiu xttaxcta ass nodim jzsx yknyf yuav rkva