2a3 tube amp schematic. I repaired a friend's stereo push pull 2A3 amplifier.

2a3 tube amp schematic Nonetheless, I firmly believe that its musical performance is hard to beat when driving suitable high efficiency speakers at around 90 dB/1W sensitivity or greater. The Sun is still available as a kit and is all Apr 2, 2025 · 2a3 Pp Amplifier Schematic - - Lots of the usual small dual triode tubes5 watts in single ended the 2A3 is still speaker challenged. Feb 14, 2008 · Single Ended Triode (SET) 2A3 Tube Amplifier Schematic from the book Build our own Audio Valve Amplifiers by Rainer zur Linde. Dec 8, 2008 · Schematic of the Loftin-White 2A3 Single-Ended Tube Amplifier. \2A3 PP Amplifier Schematic. The amplifier was bomb-proof packaged, a big thumbs up for the seller. The 2A3S Hommage is perfected with two versions of the luxurious-sounding Hashimoto (Sansui) output and choke DIY 2A3 TUBE AMPLIFIER ON A BUDGET OK folks, I was going to make this one another amplifier kit project, but I have enough on my plate for now. The 2a3 will, says with gritted teeth work nicely with the Electas, bit they don't. Output: 3. Modern manufacture reproduces this directly heated design. Earlier this year, I was finally able to start my build which is now complete. The circuit is directly coupled to the 6SL7 SRPP input stage. Here is that schematic: Dec 10, 2012 · Anybody seen a list of 2A3 single ended designs out there? Looking for comparisons and pros and cons - in particular, curious about the newer, current Jan 18, 2014 · Over the years, JE Labs (via Angela Instrument) has published several versions of his simple 2A3, 2A3/45 schematic. I think SonnyMarrow posted one he made but he couldn't post the full schematics because it was similar to Eddie current studio T Sep 25, 2018 · OK, the title is fairly straight forward. 00 USD with Magnequest Option, Shipping is $25. We have 25 copies of this limited edition finished in the Triode Lab Classic Hammertone that mimics tube amps from the golden age of mono-amps. 5 (Alt T in Lundahl datasheet). The 2A3 is a DHT tube just like the 300B, of similar general characteristics: mu is around 4 in both cases, while plate resistance is between 700 and 800 ohms. Such tubes, like the 45 triode, 2A3, or 300B, are prized for their sonic qualities, high linearity, and minimal interstage This is the project page for our budget DIY 300B tube amplifier build. Get detailed instructions from the book 'Build our own Audio Valve Amplifiers by Rainer zur Linde'. It has a lower dropout voltage. 5 watts with the Sovteks, and 2 watts with the JJs. 00. Minor details: The power Jun 27, 2021 · Let’s get one thing out of the way: I love the 2A3 power tube. The main features are excellent performances (low distortion, wide bandwidth, high output, and low noise level) that are Jul 2, 2019 · Im repurposing this thread originally asking about the output transformers for my proposed 2a3 push pull amplifiers to cover the whole amplifier. Sep 8, 2017 · On BOTH designs, I deplore the cap input filter after the rectifier, and of course, the high DCR 10 HY chokes in each supply, are the BIGGEST screw - up, its use simply RUINS each amp, both 2A3 amps, from being able to play dynamically. The amplifier was purchased through eBay end of January and shipped to Holland with surface mail. Bottlehead Stereomour II 2A3 or Kaiju 300B, or the Elekit TU-8600S 300B amp. g. Compared with Single-Ended amps, I am happy about the additional watts and improved bass control. 5-3k. I would eliminate all voltages from the speaker jacks and input connectors. After a lot of web research I found a few schematics that I liked from the JE Labs website (now offline) and Angela Instruments. Nov 30, 2008 · Hi, I'm a first time tube amp builder wannabe. It’s ideal for high-efficiency speakers in nearfield or intimate rooms. All the hard work is done for fun. Feb 6, 2004 · Hi all, trying to design a gruntier input/driver for a 2A3 SET amp. 5 Watts, SET, class-A] SET 2A3 Tube Amp Schematic by Loftin-White (6SL7 SRPP input) - [3. It was absolutely magnificent and resulted in my selling off my high-end solid state system and becoming addicted to tubes - that came much, much closer to the sound of live instruments than anything else i had heard before. This example has Feb 13, 2018 · If anyone has a schematic for a 2a3 amp that they have built and it sounds great please let me know, I've been looking to build a nice one of these and have searched the web but didn't find much. Feb 26, 2017 · I built tube amps, many, for decades. Thank you. All input apprecaited. Obviously the versions presented here will not sound like the Kismet. This is revisited schematic! See details at Upgrades page. the Best pure class a tube amplifiers in the world | Highest quality components combined with the latest inovatiive technology . In this schematic also there are no passive components on the signal! The output tubes used are the 2A3 Valve Art by Part Connections. It had ECC99 tubes for the drivers. Please feel free to suggest better op points, circuit mods etc, but I would prefer to use these tubes or maybe some other common types. This is for a new build in the planning stages. Good 300B tubes seem expensive, 2A3 not nearly as spendy. 47uF/200V 1 2 JB 5V 1 2 3 JA HFV 1 2 3 J3A 3PIN 1 2 3 J2A 3PIN D21 MR760 D11 MR760 C7A 100uF/100V 220uF/450V C2A C32 220uF . Oct 27, 2012 · Yes, it is definitely a Chinese knock off of the very well regarded Sun SV-2A3. I have always threatened to try a PP 2A3 amp, so now might be a good time. It would be difficult for to implement based off of schematic alone, I would need either a PCB or detailed build manual. This was a pair of PP2A3 amps with a Mullard-Style driver circuit pumping 8W per channel of pure Class A to drive 82dB/1W/1M (in)efficient BBC LS3/5As, with external preamplification. 5K 10W resistors, not 15K 10W. Note that the 2A3 cathode resistor should be two 1. rectifiers or active. Jul 27, 2025 · In this video I scratch build a stereo tube amplifier using PSVane Horizon 2A3, 12AT7 and 5AR4 tubes and Hammond transformers. A fully-balanced 30-watt amp using about a million dollars in tubes. This is quite surprising, especially considering that the 2A3's being used are only the basic Psvane "Hi-Fi" grade, and also that the interstage & output transformers are only Hammonds, which aren't the most outstanding New 2A3 PSE by Andrea Ciuffoli - starting in the November 2007 INTRODUCTION The targets of this project are the following: simple and cheap hi-end performances a low distortion to 4-5w on 8 ohm good damping factor with a Rout < 2 ohm only 2 stage but no interstage transformer. It is a great tube to use to drive a 2A3: reasonable Gm and high Mu. Mar 26, 2016 · I've ran 6AC7 in single ended amps, make excellent drivers and have not had any noise issues either, even on AC heat. I didn't take my decision at this moment, that's why i'd like to know wich of all those versions is/are your favorite. Looking for designs/schematics that are considered good ones. My speakers are very high sensitivity, so 2-3 watts for the 2A3 and 8-10 watts for the 300B is not Oct 19, 2021 · Elekit TU-8900 2A3\300B Single Ended DHT Tube Amp - Build, Impressions, and Review Discussion in ' Headphone Amplifiers and Combo (DAC/Amp) Units ' started by Maven86, Oct 19, 2021. to be cheap enough sensibility to be used without a preamp. I have not compared 300B and 2A3 myself so not sure how different but would love build 2A3 SET Amp. In comparison, with the Stereo version, you will find better tube bloom, sense of holographic, transparency, greater sense of weight and perfect decay you would expect from a classic high-end Single Dec 11, 2006 · Project: A DIY SET Transformer-Coupled 2A3 Tube Amplifier Goal: The design of a high quality transformer coupled headphone amp using current-production or easily obtainable parts, including the output and mains transformers. Note that this amp needs an input transformer to split the phase. The classic zero feedback Single ended triode operation delivers 8. Be very careful about the high voltages involved. "Fi Primer" LW SRPP-style Pros: - good distortion figures - apparently tried & tested - minimum number of total 2 stages only Jul 11, 2020 · Here is an illustration of an amp with the K & K CCS as the plate load for the first tube. Jan 15, 2023 · As my third tube amplifier I want to be more than 3. To review, I wrote: After reading my review of the Circuit Radiotron 6C6 driven Single Ended 2A3 Stereo Amp Tubes Two 6C6 pre-amp tubes, Two 2A3 power tubes, 5R4 Rectifier Power 3-1/2 watts per channel Inputs Two RCA line-level Dimensions 16" deep x 11" wide x 8" high Weight 22 lbs. I have attached a schematic that unfortunately isn't very readable, but it's all I have. JUST DO IT! Nov 15, 2019 · With a bit of persistence and some advice and help from the AK crowd, I built the JE Labs "2001 edition" 2A3 amplifier that was documented on the Angela Instruments site. 5 WPC of pure triode magic. 5 Watts, SET, class-A] After looking at different circuits in the Internet, I have decided to calculate my own 2A3 Amp circuit design. I would use 2 or more resistors in parallel of suitable value and rating to distribute the power. Btw, every excellent tube amp shouldn't sound like a bad tube radio. Don't wait to be asked. 00, 1,175. That applies only to the basic layout and look of the amp since the internals are completely different, and of course, the Sun SV-2A3 has all Tamura transformers. 5W resistor . I a 21/6/2011 Sheet of C:\Users\. Building and selling triode vacuum tube audio amplifiers. I am asking for assistance from the more experienced tube Apr 7, 2018 · Although the TruthTM amplifier is ready to plug-and-play, thanks to the extended burn-in and testing at the factory, there’s an optional bias setting procedure that lets you dial-in the bias to any good working set of 6DJ8 and 2A3 tubes. Developing this amplifier has taken a lot of time. PS Has anyone here built Aug 20, 2017 · A direct coupled push-pull 300B amp with input sensitivity high enough that it can be used without a line stage preamp is possible, but it would require 'stacked' power supplies and a center-tapped plate choke for the push-pull driver stage. seems like there should be a way to get rid of that is there?????? May 7, 2011 · I’ve never used these tubes, but they are real cheap. I am wanting to build a 2A3 or 300B SET OTL amp if I can find a schematic that has a proven track record. Jul 17, 2022 · Found this schematic in a post. I liked the sound of the 2A3, more neutral balance than a 300B, with solid low frequencies. Recently I built the Feb 20, 2024 · I'm contemplating building either of these amps from a kit. Cheers! 2A3 Single-Ended Amplifier BuildHere we have a blog post sent in by Mr S. I'd appreciate any That was my motivation behind this project, to design and build the best possible 2A3 stereo amplifier using only one parts supplier. I have built every feasible circuit. before I figured-out where it was " at " for me. 5V Jul 6, 2014 · Hi there, I am planning to build a 2A3 SET amp, and have been comparing various circuits. Sure, this was a limitation, but it also turned out to be an inspiration for creativity. This is a very simple, direct, short signal path DIY 2A3 amplifier with only 2 stages – driver and power. The sensitivity is somewhat low for an 'integrated Nov 18, 2018 · Yes, those are from an organ. A Japan guy who build same amp wrote to me that need do this bellow. Currently, the available choices have burned down to the following three 1. Inspired by the Kismet 3 by Fabio Camorani, yet with different power supply and driver tube. So I will put the schematic and parts list here on this page. , regarding a recent build using a 2A3 circuit: "They sound pretty good: engaging, natural, musical. This schematic features a 2A3 Single-Ended Triode (SET) Tube Amplifier with an EF86 input stage and solid state power supply. 6E6P-2A3 schematic Here’s my ugly hand drawn schematic diagram: Aug 11, 2022 · Nothing groundbreaking here. SchDoc Drawn By: Mar 11, 2005 · In another thread Frank (fdegrove) showed the schematic for a 2A3 based push-pull amplifier, derived from an original created by Triode Dick. The LL1660 is configured as step-up of 2:4. Mar 16, 2010 · Yesterday I received my latest addition to my SET collection, a eBay hong-kong SUN SV-2A3 clone. And after ten years of on going R&D on the same design, we can safely call this the end game for the integrated amp design, and what we will be selling for the next 10 or 20 Jan 12, 2009 · If you compare the two schematics side by side, you can see that the main difference is the use of a cathode follower in the driver stage and in the way the output tubes are biased - the first amp has a higher plate voltage and plate dissipation, at values that I think are too high for 45s. A power amplifier with the '45 or 2A3 as power tube will not exceed 350 Volts B+, and because of the '45 being one of my all-time favorite tubes, this would be the choice. Discover 45 tube amp schematic designs and learn how to build your own high-quality tube amplifier for audio reproduction. I do not like attaching stuff to the chassis. I want this 45/2a3 single ended amp for 45 tubes use only. A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. A bit of explanation of the schem would help me much also. The Stereomour II is a single-ended 2A3 amp delivering 3. The first one was the 2001 version using a 6SL7 driver and the 2A3 output. Sep 17, 2017 · good push pull 2A3 design schematic - vinnie2 - Tube DIY Asylumgood push pull 2A3 design schematic Posted by vinnie2 (A) on September 17, 2017 at 07:33:22 Starting to look around for my next bread board project. ( I now prefer simple two stage amps, monaural, direct coupled, power supply chokes to the Finals each 6 Ohms DCR maximum, JJ 2A3-40s, all conservatively operated for maximum long term use and reliability. They will certainly not fit completely onto your screen, but you can scroll through or save the GIF on your disk (click with the right button of your mouse ON the schematic and choose the option "Save Image As") and print it with a common bitmap program. I have pieced together a schematic but it is fairly rudimentary. Click on schematic to see enlargement The schematic shows the full-wave bridge setup, where a secondary without a center-tap is used. 5V heaters, and the overall compatibility of the octal socket pin disposition as found in the special octal version of the 2A3, manufactured Jul 9, 2021 · I recently acquired some Sonus Faber Electas. The custom chassis took longer to make than wiring the amp up! Upon Feb 8, 2010 · I had built a Loftin White 2A3 SE tube amp, with Magnequest custom transformers in the 1990s. I repaired a friend's stereo push pull 2A3 amplifier. The key concept behind DHT designs is to use directly heated triodes as the output stage. Offered in both kit and completely built form, was the Sun Audio Sv-2A3PE capable of delivering magic from a pair of quite good 2A3 tube? The parts quality is impressive with Tamradio (Tamura Corporation) transformers, the Russian made Sovtek 2A3 tubes, Elna Cerefine power capacitors and ceramic tube sockets to name a few. Still, after almost twenty years of Sep 24, 2020 · Here is the complete schematic for the PS-11. Before powering the device up Offered in both kit and completely built form, was the Sun Audio Sv-2A3PE capable of delivering magic from a pair of quite good 2A3 tube? The parts quality is impressive with Tamradio (Tamura Corporation) transformers, the Russian made Sovtek 2A3 tubes, Elna Cerefine power capacitors and ceramic tube sockets to name a few. FIGURE 1: Power-supply schematic. Apparently they are sorta like 2 2A3 triodes in one envelope. Oct 31, 2024 · There is 65mA of current from the 2A3 tube to ground and I would like to limit to around 20% over so that in the case of driver tube failure - as described above - the NPN would switch and the output tube wouldn't melt. I've done a good amount of searching but nothing has really popped up. The only indirectly heated tubes allowed will be in the power supply or support positions e. The direct-coupled (no coupling capacitors) two stage circuit was designed as a laboratory amplifier in the 1930's but the team of Loftin and White. Feb 6, 2014 · If you re-read my post carefully, you'll realise that I have built "both" a 300B amp, and the 2A3/45 amp. Some say that 2A3 sounds better than 300B and if speaker is high enough sensitivity, then hard to beat 2A3 for the money. The new 2A3 Integrated amplifier: The 2A3 EVO After ten years of revolution on the original 2A3-i , we have settled with the finest HIFI transformers - HASHIMOTO of Japan. At the moment, I'm trying different topologies from well-known Jul 24, 2016 · SET 2A3 Tube Amplifier Schematic (EF86 input) - [3. Well executed and compact, the amps are even tube rectified with the 5AR4. The 6SJ7 is a fine tube, just doesn't make a great driver tube is all, especially on the harder to drive loads like 6AC7 does. I was on a tight budget, and my main goal was to learn about tube/valve amp construction through this build, and not necessarily build the best Apr 27, 2014 · The RH300B project has spawned a schematics variation for the 2A3 tube, and from there several similar variations derive, RH2A3/1619, RH6B4G/6L6 – as presented in the previous blog entry. a very good choice for high sensibility loudspeakers 92 We often gets questions like how to build a GM70 or 2A3 amplifier, or what is the 'best sounding tube'. May 30, 2015 · A blog about my DIY audio journey, how I learnt how to make valve/tube amplifiers, fullrange driver speakers etc. 5 watts but to use as previous one DHT as final tubes. Application Notes 2A3 Push-Pull 20W Monaural Power Amplifier This section introduces one example using R core audio interstage and output transformer: 2A3 push-pull 20W monaural power amplifier. Except that they cost $13, rather than $200 for a vintage 2A3. My experience with the PX4 though is that it wants a higher impedance on the output transformer primary than the 2a3's oft quoted 2500Ω. 5 watts then a 2a3 SET makes more sense. In fact I have built it with 45/2A3 already. so started laying this out and ordering the handful of Feb 26, 2017 · I built tube amps, many, for decades. With appropriately sensitive speakers, I’ve long found that this tube just gets me a bit closer to the music than anything else. If you have highly efficient speakers that can get by on 3. I came to enjoy their simplicity and the good sound a D-C amplifier circuit achieves. It includes schematics, the BOM and links to videos. after I've tried a interstage coupled version. Maximum output of this amplifier is 20W that is quite enough for family use. FYI - I recently painted a chassis which will be used to build my version of this classic. What is that ? where will be connected Jun 18, 2012 · The Simple 45/2A3 was literally taken out of the RCA tube R-C amp chart. Sitting directly behind the tubes are four transformers, which is the norm for tube amplifiers. - First stage and second stage would share a single 400V DC power supply, with its ground to earth (0 Sep 18, 2016 · je2a3 amp Twenty three years ago, I built my first 2A3 amp in the basement of the very same house I'm staying in right now. Mar 9, 2021 · An ECC99 can easily drive a properly biased push pull set of 2A3 tubes. Mar 10, 2008 · 1. Note the tube is an EC86 which is another cheap tube, if you are patient. com. 2A3 2A3 Aug 11, 2010 · In this case however, I'd like to find a project for a headphone amp using 2A3 or 45 style tubes (SET) -- or a 300B amp. The Legend Monoblock 300B-2A3 Parallel Amplifier is a true high-end amplifier, a beautiful expression of single-ended amplification, reserved for the discerning audiophile. After building a 2A3 single-ended (SE) amplifier and retrofitting a set of 300Bs in place so I could compare the two types of output I came across a few designs using 211 and 845 transmitting tubes. Jun 21, 2020 · This 2A3 Push-pull amplifier, built in 2009, has proven itself to be an excellent performer. Nov 28, 2016 · Remember the PX4 is close to the 2a3 in terms of Vp/Ip and if you take a design that makes a good 2a3 amp you can always convert to those tubes once your PX's get old and need replacing. Nov 28, 2015 · Hello Folks, I am looking to replace my solid state amplifier with a tube amplifier. The reason being that I did not have these components when I started the project. This is needed when using 2A3's with the wimpy Allied transformer and low line voltage. I have not had any problems yet. 5 Watts, SET, class-A] 300B - directly heated power triode. I’ve had a few push pull triode amps in the past based around all of the big characters; the 45, 2A3, 300B and 6B4G, and the Tube Fantasy 2A3 monos hold their own fidelity-wise with any of them. I have a pair of Klipschorns and a Transcendent Sound Grounded Grid preamp. It's actually more than 12W because the cathode resistor gets the 60 mA from the 2A3 plus 4-5mA from the resistive network that sets the 12AX7 anode voltage and grid-to-cathode bias for the 2A3. I don't recommend that combination since the Allied transformer is only rated for 3 amps and the 2A3's draw 5, but I sometimes run my Lexan amp with 2A3's and it has the Allied transformer. Alan Eaton Amplifiers use point to point wiring and vintage components for the best audio experience. The tube complement is mounted towards the front of the amplifier, comprising two 2A3 tubes as power output tubes, with two 6SN7GTs and one 5U4G tubes beside them. Ask a group of tube amp lovers which is their favourite of all the directly Mar 22, 2010 · Hello everyone, The attached schematic shows the SE amplifier I have built. Since the circuit is very simple, I used good quality parts (Cerafine and Audyn Cap Plus caps, Kiwame Resistors, a GE JAN black plates 6SN7, Golden Dragon 2A3 tubes, etc), but I bought Aug 18, 2011 · 2A3 Single-Ended Loftin-White/Shunt Regulated Driver. That was a very sweet amplifier. I’ve felt this way about every 2A3 amp that ever crossed my path – and fortunately, I’m not alone in this regard. I'm going to build a pair of 2A3 push pull mono amplifiers. What many a tube-based amplifier maker will tell you is that the textbooks are wrong, as they run 130mA per output tube and get 36W Sep 12, 2022 · This thread has the goal of collecting schematics, pictures and comments of any kind about amplifiers where ALL the signal tubes are directly heated - both input and output tubes. So I finally measured the amp today, it is significantly rolled off at the top and bottom, and manages a whopping 1. Yes, I do enjoy so much DC coupling that I might try to turn the 300B amp into Loftin-White too. i've got a pair of EH 2a3 tubes and a pair of tungsol 6SN7 tubes laying around. Reviewer: Richard George - TNT USA Reviewed: December, 2002 To afficionados of single-ended triode (SET) power Aug 29, 2012 · The Simple45 that Bigun linked to is the precursor to the TubelabSE, which makes a nice 45 based amp with mosfet followers. I would like to build it, but need to find suitable transformers readily available in the USA. May 6, 2025 · I grabbed a Frankensteined console from the thrift store inside it was a Sherwood tube am/fm radio, a Garrard AT60, and some yet to be known 2A3 amp. The 5842/417a front end is sufficient to drive any of the above power tubes using the followers. The ultimate DIY 300B SET Power Amplifier comes in our Mentor chassis and can be built for 2a3 operation. January 2014 World Premiere! Triode Lab 2A3-S Vacuum Tube Power Amplifier Triode Lab is the little company that can. 5w of pure SET sound – Massive output transformers in three levels deliver incredible Performance! The Mono-Blocks sounds good, totally different from the Stereo 2A3 although both portray the 2A3's character better than anyone else on the planet. SET 2A3 Tube Amplifier Schematic (EF86 input) - [3. . Recently I built the Jun 15, 2014 · This brings us to… a Triode (2A3) Push-Pull amplifier. The EleKit TU-8900 300B/2A3 SE Power Amp Kit The 2A3S Hommage was designed to celebrate the 10th anniversary of our 2A3 Classic (MK2), as well as pay tribute to the original MK1. make ground breaking sound. Jan 19, 2019 · 2A3 speaker terminal As for listening test, I played several type of music, this 2A3 SE amp is much differ from my previous 6SN7-2A3 or 717A-2A3, the plate choke can really store energy and I get more detail, very dynamic, very satisfying bass, and huge soundstage. Summer 2009 The Feral Eye 2A3 Amplifier Article By Herb Reichert Schematic By New York Triode Mafia From Sound Practices Issue 14 I have a confession to make. revised schematic: R1 : 100K R2 : 1K R3 : 10R R4 : R5 : to drop the voltage a bit for the CCS C1 : to be calculated as this will detirmine the Jan 30, 2021 · Get some good NOS 2A3 and the same NOS 6SN7/CV1988 (the best!) for this amp and you'll get rid of thin sounding chinese tubes. A Directly Heated Triode PP amp can combine the harmonic naturalness of triode amplification, with the lower output impedance & good LF control of Push-Pull amplification. "If you are not intended to the convertible (2a3), just swap this constant currency sink to 1. Feb 20, 2025 · Overview of the DHT Single-Ended Stereo Tube Amplifier The DHT single-ended stereo tube amplifier is designed to deliver a warm, engaging sound characteristic of tube amplification. Sorry if I drew it in a hurry. I’m looking for a schematic and parts list for what the majority of you folks would consider the prime example of a traditional performing/sounding 2A3 type SE amp. The "Free Lunch" Direct-coupled 2A3 amplifier, by Jeremy Epstein ©2000 "Rewire! Reuse! Recycle!" Evolution While exploring the delightful, cheap little "Darling" amps (which use the 1626 indirectly heated power triode,) I learned how to work with a direct-coupled design. It used Monolith Magnetics output transformers. EF86 input stage. The 300B is built after the Morrison FiPrimer schematic (cap coupled) and the 2A3/45 DC coupled. OPT: 2. Of course you could Mar 30, 2015 · After building a 2A3 single-ended (SE) amplifier and retrofitting a set of 300Bs in place so I could compare the two types of output tubes, I was amazed at what a SE directly-heated triode (HT) amplifier could sound like. I've started developing a 2A3 SET amp by trying different published circuits, and will use this thread to record information for those who come after and foster discussion for those currently interested. I am temporarily not working due to being on chemotherapy, and need to keep it cheap, so purchasing interstage Jun 20, 2007 · I was thinking about an amplifier using two 2A3 tubes in push pull at the output, when I coincidently stumbled across such a circuit in the 1934 thordarson transformer manual that claims a total of 2. Here's my question: How much would I have to change to adapt my current amp (top schematic) so I can use Jun 27, 2024 · Hailing from Triode Lab's Canadian factory, the SET 2A3 EVO integrated amplifier ($8999) is built from such high-quality components as Mundorf silver oil film coupling capacitors, Japanese QQQ tube sockets, and Hashimoto Electric output transformers (originally found in the coveted '60s-era Sansui AU-111 integrated). Feb 7, 2014 · RH2A3 – An Amplifier With a Twist! During the final development stages of the RH300B amplifier a similar schematics for use with 2A3 tubes has imposed itself as quite feasible and logical. Can somebody please post a good and simple schematic for me to follow please? probably parallel feeded. Dig through the tube data books for 2 digit 1930's stuff between 27 and 89. I will post a scan of the article and schematic later today. Sep 6, 2008 · For a preamp evoking the 2A3 thing, you would probably do better to build with the classics; 27's, 36's, 56's, etc etc etc. 5% harmonic distortion. Also note that the plate supply also provides voltage for the field coil speakers. another 30-watt amp, this time using the very cheap 807 tubes. One in particular another 2A3 amp schematic! Feb 23, 2011 · The schematics I published are with 6CB5A output tube, but it can be replaced with a 2A3 with the same driver stage. Some background: I've built a Bottlehead Mainline which has been my primary amp for a while. For output tube I took 2A3 direct–heated triode. Well, most of the sonic results depends using the right tubes, use them as intended, not save on transformer quality, and using circuits which are well engineered. I just bought 8 for $50. 67k ohm resister". The tube diode rectifier GZ34 should be the Mullard version. Additionally, I am not familiar with how to spec a NPN transistor for this application. Build quality is better than many; these amps are solid little bricks. My original concept for this project was to quickly whip out an SE amp using parts in my bin in order to evaluate the sonic merit of the type 45 DHTs I Mar 15, 2023 · Well said Erik. But Dec 29, 2014 · Hello All, I was going through my files today and found a few schematics. There is a reason the 2a3, when used in single ended configuration, is called the "tube of emotion". I already have some schematics in my Jul 1, 2006 · Schematic, (standart Loftin - White schematic): here Amplifier - early version, input stage with double triode 6N3P in paralel (without power supply module): Gallery of Bulgarian Audiophile Society Input stage - russian single triode 6S3P-EV Output triode - 6A3/6B4G/6S4S; 2A3/2S4S (with 2. The SRPP operating design works like a push–pull amplifier that uses the current flowing through the bottom 6SL7 triode to define an inverted signal to drive the top 6SL7 triode. This was from me :) Yes, I reverse engineered a Don Garber amp, generating this schematic, and found it matched with Lipman. 5% THD. For the low cost of admission, these amps present a Jul 17, 2022 · Out of curiosity, I decided to model in LTSpice the direct-coupled 6B4G SET published in Lipman's Practical Amplifier Diagrams (1947), which is identical to Don Garber's Fi 2A3 & Fi X. For me, I would want mono-blocks, no more hernias for me, please. The 2A3 is an audio power triode that is still used in amplifier designs. 5W @ 2. Very simple and elegant little triode amplifier. Tubelab sells the PCB's and if you pick up a power transformer with several secondary taps, you can build/modify the design to run 45's, 2A3's, or 300B's. May 1, 2019 · Hi all. C. Do you have a personal favorite set of 6DJ8’s, 6922’s and 2A3’s? Bring ‘em on! The multifunction bias meter, unlike a TV-type tube tester, measures You have been asking for this and I discovered I have all the parts here to build a simple Single Ended 2A3 amplifier using AC heaters etc. TubeDepot offers over a dozen other tube amp/preamp kits, from a $300 headphone amp for your iPhone to a $2,000 upscale version of this amp. Apr 8, 2024 · Looking for schematic, design and/or plans for a 2a3 interstage headphone amplifier. The 2A3 is normally used in a push-pull arrangement and care needs to be taken in the bias settings for each valve as a small change in grid bias will greatly alter the standing anode current and any mismatch will impair the reproduction quality. In most schematics that I look at for tube amps there is a grid resistor on the power tubes in the output section and also a coupled capacitor (which i assume is here to protect the 2a3) but just before the 2a3 there is another 1K . We often gets questions like how to build a GM70 or 2A3 amplifier, or what is the 'best sounding tube'. By any rational standard, I am not qualified to design an audio amplifier. DIY 2A3 SE Amplifier This is my first self made tube amplifier using directly heated tubes. Using the 6sh7 driver tube and 5u4G rectifier . Feb 15, 2017 · A tube amplifier project from Costa Sarris, based on the Loftin-White circuit, using a 2A3 directly heated triode power tube. But a "Darling" amp, even using two Jun 4, 2019 · Hey all, I am looking for a 2A3 headphone amp project. Indeed, the 1619 is very much compatible with the 2A3, with its 2. The original schematic can see at its own page. The design of an amplifier is more important than parts quality – don’t waste $$ on expensive parts in a poor design. Lipman does not provide operating voltages, nor have I been able to find any for Don Garber's amps by searching The Feral Eye 2A3 Amplifier Article By Herb Reichert With Schematic By New York Triode Mafia, DIY Audio Projects And Articles On Enjoy the Music. To use a center-tapped secondary, as most tube power amplifier power supplies do, we leave the following parts off the PCB. The 2A3 tubes have been very popular for their gentle, transparent and detail sound. I have looked everywhere for a reference for this one. Glow in the Dark Audio showcases Kevin Davis’ personal collection of small-scale, DIY and one of a kind hifi audio gear, with a focus on single ended and push pull tube amplifiers and full range open baffle speakers. I scouted the internet and I reached a SET schema with 4 2a3 triodes proposed by Andrea Ciuffoli. Dec 26, 2021 · Hello, Have not had a chance to try 2A3 tube amp and keen to build one. Fi 'X', 2A3 Stereo Power Amplifer, from Fi Audio Truly Unique Chassis, Simply Beautiful Sound Fi Audio, Model 'X' [Italian version] Product: Fi Model 'X' Manufacturer: Fi Audio (E-mail only) - USA Retail price: $895. I have read dozens of books and even studied in the classroom of my mentor Arthur Loesch. Sep 17, 2020 · Have any of you built a JE Labs push pull 2A3 amplifier? I'm asking for impressions on the design or personal results. I can now honestly say that I prefer vacuum tube amps (although I like tinkering with all types of audio gear). Jan 4, 2013 · Push pull amps rely on negative feedback in order to achieve higher power whereas the simpler SET amps do not. Jan 12, 2009 · If you compare the two schematics side by side, you can see that the main difference is the use of a cathode follower in the driver stage and in the way the output tubes are biased - the first amp has a higher plate voltage and plate dissipation, at values that I think are too high for 45s. My question is how much can be the differences of Ia and GM between tubes? The topology with the cathode of 2 tubes connected together help Jan 29, 2019 · Building a tube amp has been a dream of mine for a couple of years. I would add a grounded power cable and fuse then Foreword All the schematics you'll find below are quite large, enough to keep the value of the components readable. com Original schematic: This is the schematic for the original amplifier as found on Ray Koonce's Time Bandit 2A3 amp page. Jul 11, 2020 · Here is an illustration of an amp with the K & K CCS as the plate load for the first tube. Review By Rick Becker I n our last episode of High Efficiency Adventure, the review of the Zu Audio Union loudspeaker, I spoke with delight about the 2A3 Classic Mk2 power amp mated with the very high efficiency Zu speaker. ahsjvo ojcipep tflxb swgxbb bghevl nvdf ymbmb sgwebp rrqhqtrn jmnmagfg tcjp efq uqiccq fjsw ppuk