211 output transformer Compactly arranged 211 output tubes and the near heater peripheral section are placed at very near the amplification unit so that from the first stage tube to output tube base could be stowed in a compact space eventually minimizing the wiring travel to the utmost limit. In addition 4 B+ chokes, 2 each for the 211 and 801A plate supplies and 2 filament chokes, one for each tube. TECHNICAL FEATURES:Primary Impedance: 16K (Anode to Anode) or 21K (depending on the secondary load)Secondary Impedance: 6 Ω or 8ΩPrimary Inductance Lp=350H @17Vrms/50hzLe Feb 19, 2016 · The specifications of the 16K primary impedance output transformer can still be tweaked to obtain different results, say better low or high frequency responses but not both. Mar 7, 2016 · Although the 212 PPP OPT outshines this 211 PPP OPT in terms of power, still, it packs a lot of power at hand to drive most speakers in the world. Sep 23, 2017 · Hi I want to know some very good brand of output transformer for single ended amplifier. A more difficult decision might be the exact brand and model of transformer to use. Moreover, It use the high quality output transformer ( Hasimoto . Find great deals on eBay for 211 Output Transformer. The four similarly sized transformers in front of them are X2. It is physically larger and exactly double the weight of the original Dynaco PA-211…. Technical Parameters Sep 9, 2025 · LAIDYS-30WD 30W Single Ended Output Transformer 180mA For 211 VT4C 845 805 GM-70 outstandingdeal Official Store (9972) 98. J. I decided to use very well tried schematics - 80 % is my Lampizator DAC scheme plus the power tube circuit . The amp was publicly demonstrated at the ETF 2009 in Stella, France. 25V/3. 4% positive An output transformer can be used to match a low impedance loudspeaker to the high resistance valve output stage, thereby greatly increasing efficiency. The Mcintosh 20W2 and 50W2 came with transformer drive and sounds far, far better than the MC30's, 75's and 60's that came later. The worst enemy for 16K output transformer is the high frequency response! To achieve such high primary impedance, much more primary winding/turns are needed, and therefore the additional capacitance will bring the high frequency response down. 25A AC or DC on the filaments. Took a total of 4 chassis, 2 per monoblock. In addition some smoothing And whats most important - the output transformers are of first class - the famous OGONOWSKI type. No other amplifier is built like the 211/845—and no other amplifier sounds quite like the 211/845. 98 watts and that doesnt include the losses of the circuit and output transformer. Mar 30, 2015 · The 211 tube requires 10. Here are pair of early Hirata Tango single end output transformers which is considered as the best transformer in the world for 211,845 tube amp. Jul 12, 2021 · Instead of conventionally used EI core choke coil, we have developed cut-core type anew for drastic improvement in sound quality natural and strain-free by having removed unpleasant signals. I am looking for the winding technical information of the transformer with technical data below. If the wrong transformer is used, the results can be low output and loss of tone quality. Output Transformers Single Ended Power Amp Output ( Orient Core Hi-B ) At an eve of 35 years anniversary as AirTight, they will launch the new 211 single monaural power amplifier ATM-2211. The 211 requires around 10'000Ω as their anode load and the 845 about 5'000Ω. 211 Schaltung mit freundlicher Genehmigung von Dipl. The above is the specification we feel optimal for 211 tube. Again, my loss is your gain. The power amplifier use one 211 power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide 27W adequate output . "Switching between the 211 and 845: Since the 211 and 845 have different output impedances, they have different output transformer requirements. 5dB output transformer will lost many low level music. Aside from a 3. Great for all 300B tube in single ended circuit for output 8-10 W. When I retrofitted the 300Bs, I decided to use regulated DC on the filaments because I did not have a 5V AC filament transformer. Majority of tube amplifiers on the market have an output transformer. Sanei used the same Tango Output transformer with 10K Primary impedance for the UV-845 model with 845 tube and UV-211 model with the 211 tube. (In this case, the speaker. Kagura’s pure silver coiled output transformer handles output impedances of 4, 8 and 16Ω. 845 . Nov 24, 2019 · It's very difficult to make transformers for 1000:1 frequency range, and even harder with DC biasing the core. Given its rather small stature IWISTAO 50W Output Transformer Single-end Z11 1 Pair for Tube 813/FU-13 211/VT-4 845/VT43 GM-70 It is made of Japan imported Z11 silicon steel sheet and pure copper wire， and then the transformer will be fixed in a shield cove with glued. Like the original Dynaco (tm) units, they're the best bang for the buck available in output transformers. Get the best deals for Output Transformer 845 211 at eBay. Dimension and length of amp will also be longer/heavier. 211 Circuit placed here with kind permission of Dipl. Replacing 211 output tube is easy as a dial corresponding to both the plate loss 75W type vintage tube 211 that exists separately from the conventional 211/VT-4C plate loss type 211. Soldano did switch transformer suppliers for various reasons over the life of their business. Many current amplifiers try to run these tubes at lower voltages and without a robust It is not possible to drive a 211 with capacitor coupling. Tanaka below) for this demonstration. Shop with confidence. My newly developed mains transformer for 211 or 845 amps and separate filament transformers for the 211 and 801A. The AmorphCore series “ type SA-17 ” is a single ended output transformer designed around a parallel 211 triode output stage. The transformers are made on Amorphous Duble C-cores ). Our PA-211-B is a totally new design incorporating the latest advancements in both materials and transformer engineering. 211-M RSR : $65,000 USD / Pair : 50W Grade NOS TAMURA or TANGO NOS Flagship 211 Output Transformers (Even 30 years ago - the production was very small and very rare). Much better than most Japanese, European and US output transformers in the market. Nov 16, 2022 · Hi, I have a class a se amp project with EL84 tube. For SE transformers, the primary inductance variation due to signal level is less than 7%. It is a pity that they are reducing the production models on audio transformers due to decreasing sale volume. Output impedance (speakers recommended) 8 Ohm Output transformer: OGONOWSKI / LampizatOr Push Pull High Voltage transformer: Ogonowski (using audio output transformercore ) Biasing: manual (with exposed pot and meter) Volume: Stepped input ladder switch (24 SMD resistor pairs) Power transformers total capacity: 700 VA. The output transformer is one of the most Nov 3, 2024 · I've heard one single ended 211 amp in person, and of course it was glorious and I spend a few months sketching up designs with other, cheaper, more obscure, even higher voltage transmitter tubes using a choke loaded output to get around the hyper-expensive output transformer. but I ended up backing-off and shelving it for a later date. The two output trannys are rotated 90deg to the power mains tranny to avoid picking up induced hum from the mains tranny external magnetic field. Before we go further, take a look at Amperex's 845 tube datasheet! It actually calls out that a 16K load resistance for the 845 output transformer May 26, 2024 · Updated 2-2025 Got from my good friend some brand new and use transformers made by Tango and Tamura transformers. Kenji Tanaka (more about Mr. Soldano Replacement TransfomersO'Netics transformers are considered top tier components in the amplifier industry. Yet another option is to use two different transformers per channel, one optimized for low frequencies, one for high. 3 transformers in total "Overview and design considerations: The 211 and 845 transmitter tubes have always presented somewhat of an enigma as a large power tube typically run single ended and originally used in WWII to transmit radio signals across battlefields with plate voltages in excess of 1'000V to maximize linearity and gain. P/s: This 211 push pull output transformer looked exactly the same like 212 pparallel push pull output transformer, therefore we skip the pictures for this post. SILK Push-Pull Output Transformer is the Symmetrical Winding Technique which maximizes the balanced magnetic coupling in both push-pull coils. Lundahl Output Transformers For more information on this range please see HERE Filter Reset Topology High performance single ended output transformers with high grade M6 laminated core. Jun 13, 2024 · Lundahl output transformer, recommendations by tube type Last Update: 06/13/2024 05:07:54 Those are 500ma fast-blow types that protect the output transformers. Great combo that gives tons of clean positive drive. By "True Balanced" we mean having a real two-phase circuit (dual mono internally) rather than a signal transformer. It is one of the most important procedure to keep the graceful and dignity sound of 211. May 26, 2020 · Because this output transformer must have a high primary inductance, it limits bandwidth. The setting is preset for 4Ω and 8Ω for speaker impedance in the factory. Ideally I’m looking for a two stage 300b pse/pp amp with interstage transformer and an input sensitivity around 2v or thereabouts. Silver Output Transformers In order to realize the best performance of output transformer, it is designed to a high impedance of 12kΩ with multi-layer, multi-compartment structure. -Secondary part wire cross-section and Apr 1, 2025 · I'll venture a guess that many hundreds or maybe thousands of 211 amplifiers have been built with 10K or less transformers, and their owners are very pleased with the sound quality. The Insertion Loss over 1. Explore ISO Transformers output transformers, including Tango models, with details on primary impedance and maximum DC current for optimal audio performance. No stereo power amplifier has ever produced the levels of musical purity delivered by the ONGAKU Kensei… Audio Asylum TraderFor-Sale: DIY - Parts Post an Ad Flag Ad: Miscategorized Spam or Suspicious tango-trans. For 8 Ohm Speakers, with the Lundahl output transformer LL1691, the 211 SE power amplifier has been tested on various speakers. for SE 211. This time, we used independent power transformers for high-voltage and low-voltage which used to be integral type in past model. As a result, some amplifiers may ar may not have O'Netics transformers installed. I read an other thread that 211 needs a 16k load In the RCA datasheet recommend at 1250v Rload=9600 I don’t see why you would need 16k, do you use Ltspice? Calculate some different scenarios, only thing that will change is distortion. Some days i thrive on the high value, low cost product that brings about countless hours of musical bliss. The specifications of these May 17, 2025 · The pair of output transformers 12K to 8ohm and 16ohm ( or 6K to 4 and 8ohm) . Mar 12, 2011 · Tango interstage and output transformers, NOS paper in oil caps in the power supply. Most of our OPTs can be configured for different primary and secondary impedances. The output transformers have what you'd expect out of a Dynaco transformer, like healthy low frequency inductance , high resistance to distortion caused by output tube DC current imbalance, and low overall distortion. made in Japan). ) M y life has been filled with more than its fair share of audiophile exotica. All larger types use 14 interleaved primary / secondary sections for the best possible coupling factor and hence excellent high frequency response. The best sounding amplifiers used a 6L6 or EL34 into a driver transformer. Feb 15, 2016 · We've received many emails with regards to 16K output transformer for 211 since the publication of the previous post. All transformers are our own in-house custom designed and manufactured devices; driver and output transformers are fully silver wired AN-Perma 50 nickel C-core and the mains transformer is a fully silver wired HiB double C core. SINGLE ENDED OUTPUT TRANSFORMER 10,000 ohms 25W FOR 211 ETC Apr 1, 2025 · The driver circuit seems extremely happy driving both 211 and 845 tubes, but it seems that the driver & 845 are very happy together! Input sensitivity seems to be perfect based on most preamp output levels. We wind our push-pull output transformers on two chamber bobbins which ensures full capacity and resistance balance. Winding are all done by skillful technician hands using pure silver wires. You may have noticed that transistor amplifiers also rarely have output transformers. The sound of this amp is excellent and very close to that of the bigger one with 211 driver. T), secondary is 4,8,16, 64 (C. In normal single ended use max outputpower is limited to 7. 58-60, 4x6L6/5881, 4 Ohm for High Power Tweed Twin, Twin Amp 5F8 - 6G8-A (= 125A4A) Custom Made for TAD with high grade M6 laminations Grand Stack = big tone!!!! Oct 29, 2023 · Ultimate Finemet Input Step Up Transformer 211 845 300B Amplifier pair JAPAN Power Supplies Dual output winding toroidal power transformer for 211 filaments is full wave rectified and DC filtered separately for each channel providing superior performance without the need for elaborate test equipment to balance out AC ripple and modulation effects which normally occurs when using AC current! Output impedance (speakers recommended) : 8 ohm Output transformer : OGONOWSKI / Lampizator High Voltage transformer : Ogonowski (using audio output transformer core ) Biasing : manual (with exposed pot and meter) Volume : Stepped input ladder switch (24 SMD resistor pairs) Power transformers total capacity : 700 VA. The use of C-cores with well-defined air-gap results in an almost constant inductance throughout the whole operating voltage range. All our output transformers are tested on insulation levels of minimum 3KV except our 845/211 output transformers which are flash tested at 5KV. Nov 1, 2025 · So, I modified the bias circuitry to run either 845 tubes or 211 output tubes. 2 sold, 5 available. This is the biggest transformer in Tango. But sonically they're not even distant cousins. On paper, the Berning 211/845 is scintillating. The output transformers being compared were Sansui H-15-5 (1958-1965) and Hashimoto H-20-5. It is the output transformer choice for Sophia Electric 91-01 mono-block amplifiers. Aug 11, 2025 · LAIDYS-30WD 30W Single Ended Output Transformer 180mA For 211 VT4C 845 805 pe66 Pincei_us (3741) 98. Paul Klipsch built an amplifier like this (mono! of course) in about 1946. 211 Monoblock was created for two reasons: to add more power to the GM70 SET amplifier and to enable a true XLR balanced operation. You need another transformer for driving it as in the new Qvortrup Ongaku; or a DC-coupled cathode follower as in the original Kondo Ongaku. Quite a number of them asked about its' applicability on 845 tube too since it is often made interchangeable on commercial designs. The transformers with 8R load can give also 21K:8R load match. The transformers are highly sectioned with harmonically sized sections, which results in a minimum leakage inductance. 7S output transformers for single ended 300B amplifiers. This particular product is typically used at 1000 Volts plate voltage offering: Single-Ended 211, VT4-C & 845 Output Transformers - TRANS-310 (TX-OP-310) Group C, bifilar wound double C-core output transformer with 10K primary impedance and 4 & 8 Ohm secondaries for 211/VT4-C or 845 in single-ended operation, 240mA standing current, 50 watt, flash tested to 5,000 volts, Size 115 mm x 102 mm x 136 mm, mounting holes centre Feb 1, 2015 · The testing amp was the custom made instant-output-transformer-replaceable power amplifier designed and built by Mr. Perfect working condition, it is vintage item so it has dust, rust on surface. Features Technical and listening tests were conducted using the JEL SE2A3DX circuit. All our single ended output transformers are air gapped and the maximum standing current before saturation is indicated. Get them before it is too late. It is possible to wire the Lundahl output transformer for 4 Ohms or 8 Ohms speakers using the LL9202. Limted 2 Pairs Only. DC heating for both driver and output tube using a purely passive LCL filter per tube. The right pic shows a stereo Leak amplifier. We have a great online selection at the lowest prices with Fast & Free shipping on many items! The 5687 provides voltage gain and drives the 211/845 output tube. tube amp. It makes use of an oversized amorphous double C-core sourced from a leading manufac-turer thereby ensuring high quality standards. 3 transformers in total PicClick Insights - LAIDYS-30WD 30W Single Ended Output Transformer 180mA For 211 VT4C 845 805 GM-70 PicClick Exclusive Popularity - 5 watchers, 0. Jul 17, 2022 · Audio Asylum TraderSanei UV-845 Single Ended Tube Amplifier with all Tango Transformers 845 or 211 The output transformer has low insertion loss is very important , the best of the best is 0 dB Insertion Loss , The output transformers for High End tube amplifier need under 1dB Insertion Loss . Added / Modified Biasing Circuitry to accommodate either 845 or 211 type output tubes . But I can't find output transformer in my country. Don’t miss the chance! TANGO X-8P old version not ISO new in box $20000/pair TANGO ISO LCPF-100-150D 100H 150mA Plate Choke for 212, 833A, 845 etc (matching with output transformer below) You see there's 3 transformers on the top of it, and you think, "wow those are really big output transformers on the side, but that power transformer in the middle looks a bit wimpy". On his the output transformers were mounted at Jul 24, 2023 · Replacing the interstage transformer and 211 tube with a parallel connected 6n7 driving a triode connected EL34 makes a lot of sense and will allow you to put your money where it really counts, into a state of the art output transformer. The 211/845 is transformer-coupled to the load. This new winding scheme offers very close DCR tolerance between middel tap to both end taps which will enable circuit designer and tube amp builder to create a tube amplifier achieving super low distortion, and easier bias adjustment in a very Feb 11, 2016 · Although 16K is good for 211, not all output transformers are built the same. Only the low frequency one needs to carry DC. com/> is “TANGO” authorized genuine manufacture and retailer. The HC-203U is a bold performer and gives a front row presentation. Hammond's 1627-1642 series single ended tube output transformers are designed for high fidelity and chassis type X mounting. All transformers are based on the same core size, winding structure and secondaries, but differ in number of turns (and thus impedance level) of primaries. High inductance combined with high capacitance between the turns creates a self-resonance close to the audio band. Apr 30, 2010 · The output transformer is the heart of a valve amplifier. All transformers are very rare and exotic Tango transformers except for the bucking transformers to convert from 120V to 100V AC. Ing. The use of C-cores with well-defined air-gap results in an almost constant […] Aug 31, 2017 · I have this Custom the SE Output Transformer ordered to Hashimoto, with specification Primary Single Tap : 10kohm /80ma / 30 watt, will give enough room for my 211. Check out the Altec 1570b with 6W6 driver using an output transformer as Cathode choke Extra RARE Pair ALTEC/PEERLESS big output transformer for 211/845 and many tubes Primary impedance is 10K (C. Feb 8, 2014 · The row of large transformers in the back are the fabulous X10S output transformers for single ended 211 amplifiers as used in the recently finished 801A/211 mono blocks. com. Nov 9, 2010 · This design was intended for the 211, it is just a simulation, I abandoned the project due to the 16K output transformer, it is very difficult to design and build. Nov 12, 2025 · LAIDYS-30WD 30W Single Ended Output Transformer 180mA For 211 VT4C 845 805 GM-70 Design topology: Input transformer (optional) – 128 stepped volume control – 12SN7 gain stage – 1:1 IT coupled to EL803S driver stage – 1:1 IT or 2:1 IT coupled to 211 – 16K Output Transformer – 6AU4GT / 43IU separate tube rectification for gain/driver and power stages. This Mar 29, 2012 · In my simple way of thinking, the 845 requires the greatest drive swing, but will run into a lower plate resistance, the 211 while easier to drive is more difficult to design an output transformer for (typically 10K) and the 838 is more suited for class B, zero bias usage (like an 805). Normally the input impedance is fairly high, >1k for mic preamps and >10k for line inputs. Nanocrystalline cores are usable but the results will not be as good due to electrical properties limitation. Sep 27, 2020 · | |Home | About Us | News | Links | Enquiry | Contact Us Sep 9, 2025 · Find many great new & used options and get the best deals for LAIDYS-30WC 30W Single Ended Output Transformer 180mA For 211 VT4C 845 805 at the best online prices at eBay! Free shipping for many products! What could be the possible disadvantage to use LL1540 (line input transformer) as output transformer? An audio line is a cable transferring an audio signal from the output of one device to the input of another. Requirement is it has to be very good sounding. Feb 16, 2024 · Audiophile Tube Output Transformers Whether you are into the clean, free spirited “Single Ended” tube output or high efficiency, high power, “Push-Pull” audio, Hammond has the output transformer for you. I will send the proper biasing instructions for the 845 and 211 output tubes. or pentode tubes). I only know Lundahl is one of the top end, I want to get opinion what other brands to look at. This time, wAirTight decided not to use the overall Negative Feedback (NFB) from the secondary side of the output transformer, but to apply a large amount of NFB from the plate of the 211 output tube to the first stage. -Primary part wire cross-section and number of turns. Jul 10, 2021 · Just finished building monoblocks of 211 driving a 211 SE amplifier. Yet for many the sheer size of this amp with 4 chassis in Tube amplifier output transformers All OPTs are built in our dual coil single C-core style and can be ordered with a choice of core air-gap for Push-Pull or Single-Ended applications. If multiple secondary windings are provided, it also allows user-selectable matching to various impedances without having to redesign the amplifier. They were the primary transformer supplier to Soldano for many years. Determining Output Transformer Impedance When replacing the audio output transformer on a radio, the replacement should match the impedance of the original as close as possible. Only a very small group of OTL or Output Transformer-Less tube amplifiers get away without them (which have their own set of pros and cons). When I built my 2A3 amplifiers, I initially used AC on all the filaments and was surprised to find hardly a trace of hum on the output. The audio transformer section is only a very small devision of this gaint. They are on sale at special price. "So, my next selection was the 300B in the Silver 300 with silver wiring and silver output transformers. PA-211-B Power Transformer The new “Improved” PAS Power transformer. We are the only OEM with strict “TANGO” specification and Jul 18, 2025 · LAIDYS-30WD 30W Single Ended Output Transformer 180mA For 211 VT4C 845 805 GM-70 W worldwidsupplier (34) LL1620 , LL1623, LL1627, LL9202 The LL1620, LL1623, LL1627 and LL9202 are output transformers for tube amplifiers. T) Very big transformers. Valve amp manufacturers purchase trannys from Jul 28, 2008 · Does anyone know the spec for the speaker mounted output transformer? Specs are not on the schematic. Dec 19, 2013 · Three power transformers. but it still fits… Tamura is a big Japan company that produce various kinds of transformers up to several mega watts in size. 71mm difference in lamination thickness and use of flying leads instead of terminals (U-808) these two transformers seem to be technical and physical twins. I am looking for high end ones or sounds like the high end stuffs. 本田工業是日本一間大規模變压 Nov 24, 2019 · But I have some nos 211 and want to build this amp, the only problem is the output transformer. Nov 4, 2023 · Find many great new & used options and get the best deals for Ultimate Finemet 10K Output Transformer for 211 VT4C Tube Amplifier Japan at the best online prices at eBay! Free shipping for many products! Oct 26, 2025 · Hashimoto H-40-10S Pair Output Transformer For 845 40W Single [US Duty Paid] Output transformer for: Fender® Twin Amp, Bj. Leven. To understand their purpose, we must first dive into a little physics on basic transformer Sep 26, 2016 · But I’m glad that I gave this offbeat amplifier a listen, because it opened my ears to the starling qualities of vacuum tube power when freed from the sonic bottleneck that is the output transformer. Parts used are: - Monolith Magnetics 15K amorphous core output transformers - Monolith Magnetics FeSi plate chokes for 211 driver - Monolith Magnetics Power Transformers and Oct 22, 2025 · LAIDYS-30WC 9KΩ 30W Transformer for 211 VT4C 845 805 GM-70 813 Power Output For those of you unfamiliar with Mesh plates,please note that these beasts can handle a meager 28watts of anode dissipation compared to the standard 300B and therefore extra care should be taken when replacing normal 300B's with mesh plates. 0 new watchers per day, 871 days for sale on eBay. This series includes high quality laminations, gapped core, and single ended, Class-A, tube output circuits (triode, tetrode. Output trannys contribute most of the distortion in a valve amp and have a limited bandwidth. Hammond has been producing tube output transformers continuously for over 75 years, constantly improving and tweaking their performance. Apr 1, 2025 · I've owned and built several 211, 845 amplifiers. com <https://tango-trans. The 211 is difficult to drive. To obtain full power from a 211 or other transmitter tube, you need a positive grid voltage relative to the Nov 24, 2019 · HI everyone, My new project is a 211 se amplifier I have almost all parts except the output transformers Any suggestion is welcome Designed for 845, 211,GM70 push-pull amplifiers. The 211-M RSR is only constructed on pure copper chassis. More. These have been described in a post about my new mains transformers. 1% positive Jul 26, 2023 · (I also note that some designers, like Thomas Mayer have also made 211 driving 211). Super high amount watching. yecs rybuwz yrrb oesuwdqu vfxuok euqg ayfu jaquhq rmjxc ooudz qsby ogt opefd yxfvt osbat