Hammond transformers for tube audio amplifiers tube amp kits. Triad hs87 tube amplifier audio output transformer self bias. The right on the photo is the r core output transformer in bare condition. Help understanding audio output transformer specifications.
All transformers are tested at 100 hz, 1 khz, and 10 khz. The function of the audio output transformer is to transform the high impedance of the output tube to match the much lower impedance of the speaker. The product is enclosed in the square case on the left. There are more output transformers for tube amplifier, you can get your wanted from them. How you operate the tubes ultralinear, bias, plate voltage, operating points, etc. Well help you to work out whether its worth paying extra for a highend version or whether youre getting just as good a deal by getting the cheaper item. A tube manual or tube manufacturers technical data sheets should be consulted first, before making a decision on a proper output transformer. Few people working in transformer winding companies have a knowledge of electronics or valve amps. Hashimoto sansui vacuum tube transformer vacuum tube. The large transformers are tested at 44 hz, this frequency was chosen because it is the lowest note on a bass guitar. Transformers used between the record medium and loudspeakers. Shop from the worlds largest selection and best deals for vintage tube output transformer. The transformer specs indicate 10,000 ohms plate to plate, center tapped, primary and multitapped secondary. We mentioned niche of high quality pro audio gear, just had conversation with a friend while looking at mountain of guitar amps and even high end tube studio gear with ribbon cables and hard to access pcbs.
Conventional vacuum tube amplifier designs rely upon an output transformer to couple the amplifiers output stage to the loudspeaker. To further complicate matters, there are two such analyzers per member of. Im using a chicago a3831 universal output transformer. The one thing im stuck on is the output transformer, according to the datasheet i need to get a 35004000 ohm transformer with a 4 ohm output to power a car speaker i have. Hashimoto hasimoto vacuum tube transformer tube amp transformer amps amplifier amplifiers single ended output transformer transformers sansui leaped forward the vacuum tube valve amp amps amplifier amplifiers technologies with the sm30 and the sm80 tuner amplifiers in the early 1960s. Vintage stancor a3849 universal output audio transformer 8 watt 414000ohm 40ma. Projects, mods, transformer diagrams, photos, sound clips.
Looking through all of my scavenged transformers i cant find a single one in the thousands of ohms, most are a few hundred and lower. High performance audio transformers for audiophile applications from lundahl transformers. Low noise power transformers for vacuum tube amps the transformers listed below are specially designed for use with pat output transformers, or similar vacuum tube related applications. Looking through all of my scavenged transformers i cant find a single one in the thousands. Mcintosh circuit independent of the plate supply voltage. Rw405 singleended 3k 5k ohms 40w type audio output transformer. Output audio transformer design the output transformer in a singleended tube amplifier is the device which matches the high output impedance of the tube to the low input impedance of the speaker load 4, 8 or 16 ohm. How to test a tube output transformer and determine wiring. Because of the basic physics of output transformers, he. Classic tube output audio transformer overview hammond mfg. Results of his output transformer research were published at aes conventions in 1994 and 1998.
Understanding your output transformer part one by mark baier. To design an output transformer, it is necessary to determine the output power according to the tubess characteristics, most. The output transformer as an impedance matching device, works on the principal of reflected load. The society shall not be held liable for their accuracy, nor shall they be held responsible for any damages caused to others by the expression of these opinions. A schematic and the design details of this amplifier are available in mullard circuits for audio amplifiers book and in the national valve museum. A wide variety of tube output transformer options are available to you, such as audio, instrument, and power. Thordarson high fidelity output transformer t22s87 nos 6watt.
Some of the problem is that there is some competition on the market from the audiophile world. Output audio transformer design the output transformer in a singleended tube amplifier is the device which matches the. The plitron patpcb1 is designed for use with the pat4004 or pat4006 output transformers. Transformer winding is an extension of the fitting and turning industry.
The design of chokes, small power transformers those used in tube amplifiers and preamplifiers and audio output and interstage transformers is such a specialist topic that even most electronics engineers would not even know how and where to start, let alone produce a finished, working transformer. A possible reason is the high tooling and assembly costs. The above amplifier wattage ratings are approximates only for categorizing purposes. For the ultimate in pushpull output see our line of epoxy potted output transformers. In addition to individual audio transformers aee also supplies sets, additional components and parts for example for highend amplifiers and tube amplifiers. Whether you are into the clean, free spirited single ended tube output or high efficiency, high power, pushpull audio, we have the output transformer for you. 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. I cover how to calculate the reflected impedance of the output transformer secondary onto the primary. Make offer triad hs87 tube amplifier audio output transformer self bias pp 9000 ohm. Proper output transformer design is crucial to the success of an audiophile quality amplifier. Tamura corporation audio transformers for tube amp. Get the best deals on vintage tube output transformer when you. Plitron manufacturing standard toroidal transformer product line has over 400 off the shelf models including toroidal power isolation transformers, toroidal medical isolation transformers, auto transformers, toroidal inductors, toroidal wide band audio output transformers for vacuum tube applications, and more toroidal based products.
Testing of a pair of dynaco st35 z565 output transformers. There are more tube amplifiers such as singleended, pullpush, high power, and wireless bluetooth tube amplifier. Audio transformer is the primary part of a tube amplifier which. We make premium quality transformers for all applications in audio. But there is a general purpose multiimpedance transformer type that has not been discovered, and is easy to find at modest prices and in new production. Building a tube amp, how to calculate output transformer. Audio transformers tube output transformers lundahl. This transformer information appears in print form in our book, the ultimate tone vol. There are hundreds of pages of tube amp information on my library page. Passive preamplifier audio signal boosting transformer for smartphone pc cd player mc phono sound quality enhancer hifi. The lower impedance of the 6cw5 may allow the use of unconventional output transformers which can result in. Acxico 1pcs 5k 5w singleended output audio transformers 6p1 6p14 6p6 tube amp output transformers. Since the birth of audio electronics, the audio transformer has played an.
Output transformerless otl is a type of vacuum tube audio power amplifier, which omits an output transformer for the purpose of greater linearity and fidelity. New universal interstage transformer, 20,000 ohm ct primary with 80,000 ohm quad split secondary. Valve amp manufacturers purchase trannys from transformer winding companies. It is often available for considerably less money than the el84. Aug 06, 20 heres how audio transformers work for impedance matching, as discussed in my book teach yourself electricity and electronics. Triad hs87 tube amplifier audio output transformer self bias pp 9000 ohm. Start audio transformers lundahl tube output all opts are built in lundahls dual coil single ccore style and can be ordered with a choice of core. So happy that aes supplies universal transformers at an affordable price. I told him i could build something unique for practically nothing. Lundahl ll1627 tube amplifier output transformer donaudio.
Get the best deals on vintage tube output transformer when you shop. Winding the output transformer for vaccum tube audio. General amp use hammond puts a century of experience into manufacturing high quality magnetics for tube applications like hifi audio and guitar amplifiers. Obscure vtg triad tube audio video transformer 5 watts 15015k xlr output. Wide band output transformers with third winding for nfb exclusive use, which can make stabilized nfb circuit, eliminating unstable oscillation through the changes of secondary load.
Electraprint is your finest source for analog amplifiers and high quality handmade audio transformers and chokes. Transformers should always be installed by a professional electronics technician since there are high voltages involved and may result in serious physical harm to yourself. Building an amplifier is an important step in the experimental part of the project. The transformers listed below are specially designed for use with pat output transformers, or similar vacuum tube related applications. How to safely test the output transformer on tube radio or. Each was tested with cathode feedback, and without cfb. All transformers in this series are encapsulated in spun aluminum enclosures with a textured black finish. Get the best deals on audio transformer when you shop the largest online selection at. Apr 30, 2010 pi winding output trannys are not known to have been used in audio valve amps. I want to make an audio output transformer for tube amplifier. Then sansui perfected tube amplifier technologies by the end of the 1960s with the the a. To separate the high voltage and match the speaker impendance with the tube impendance we need audio grade output transformer. The ll1627 is output transformer for tube amplifiers. In our experience making a good audio transformer is a black art.
World tube audio portal category output transformers pp. Aug 19, 2007 years ago my brother and i were lamenting the state of hifi and how it now costs thousands of dollars for equipment. Audio transformers audiophile applications lundahl. Get the best deals on vintage output transformer when you shop the largest online selection at. Impedance for nfb winding is 16 sg taps are provided for the models excepting f781, 782, 783. If youre still in two minds about tube output transformer and are thinking about choosing a similar product, aliexpress is a great place to compare prices and sellers. Tube output transformers, which ones are really good. The 6cw5 is an audio output tube that has not been discovered by the audiophile community. Research results are published in books and articles and masterclasses. Get the best deals on vintage tube output transformer when you shop the largest online selection at. Hammond 1650k ultralinear audio output transformer for tube. He wrote over 360 articles for various dutch high end audio magazines and is the author of the book transformers and tubes. Hammond 1650k ultralinear audio output transformer for tube pushpull hifi circuits 50w hammond output transformers are well known to design engineers and audio hobbiest alike. A wide variety of output transformer tube options are available to you, such as audio, electronic, and power.
The quad split secondary arrangement each secondary section is 12 the turns of the whole primary means that as many as 4 tubes can be driven, each independently biased if wired for 1. Plitron manufacturing engineered to perform like no others. The output transformer on a tube radio or amp is a crucial part of the design of the circuit, so a restorations viability may depend on whether it is functioning or not. Tube amplifier kits, tube amplifier, transformers audioapl. Get the best deals on vintage electrical transformers when you shop the largest online selection at. Please visit my tube amplifier forum heres the place you can go to ask tube amplifier questions. Audio output transformer question antique radio forums. Amptek, tube guitar amplifiers, tubes, books, parts. Calculation of output transformers the output transformer is probably the most expensive part in the amplifier and something you have to live with if you like classic tube amplification. Tube taste is sweat, warm and soft, the sound is likes by tube audiophiles, we. Classictone transformers by magnetic components, inc. Hashimoto brand tube transformer specifications click here to download the pdf specification file.
All opts are built in our dual coil single ccore style and can be ordered with a choice of core airgap for. The high output impedance of the tube must be matched to the low impedance of the speaker to get an efficient transfer of the audio signal. This is one place that the art of transformer design comes in. How to identify the coloring of the wires and determine if the transformer is good. Pat pcb 1, tube amplifier circuit board the patpcb1 simplifies construction of proven tube amplifiers designs, using plitron pat audio transformers, and matching power transformers.
In addition to our present range of transformers we have the ability to offer design variations and completely new designs upon customer requests. Output trannys contribute most of the distortion in a valve amp and have a limited bandwidth. It also covered the fact that imho transformers are the last thing i would add to the output stage of a solid state power amplifier because output transformers like this contribute so much to the sound quality of an amp and not in a way that would make better sound, again imho. The 2a3 tube amplifier a tribute to simplicity and warm. Our audio transformers are manufactured to customer specification. If you are looking for good audio transformers, you will find them at automatic electric europe. I must mention that if the driver tubes are removed while the amplifier is in use, or the driver tube fails, the output tube can easily lose its bias voltage because there is no coupling capacitor in the signal path. Mar 02, 20 yesterdays post covered output transformers on tube power amplifiers and why they were needed. Vintage output transformer line matching tube amp mic preamp pair 600. The views expressed herein regarding the former philco corporation are the opinions of the philco radio historical society. I had previously discovered that the hammond transformers responded extremely well when cathode feedback was applied. When compared to modern miniaturized electronics, a transformer seems large, heavy, and expensive but it continues to be the most effective solution in many audio applications.
For this project, i chose a matched pair of sovteks 2a3 power tubes and a matched pair of electroharmonix 12ax7 see photo 2. This is necessary to get an efficient transfer of the audio signal to the speaker. Circuit of tube amplifier device the output transformer is an important part of the amplifier requiring a thorough parameter determination. Buy tube output transformer and get free shipping on aliexpress. Output transformer t6 the function of the output transformer is to couple the output circuit of the tube to the speaker. Click the link above for tube amp info, schematics, board building information.
Audio transformers tube output transformers lundahl transformers. The specs for each hammond output transformer are listed along with our own supplemental data. Exact replacements for audio output transformers in old tube radios are often hard to find. It is a regen radio, and the article specifies using a 10k ohm to 8 ohm audio output transformer. Classictone transformers home page output transformers. Iwistao hifi mini tube hybrid amplifier bluetooth 4. If you need to more easily switch between different speaker impedances on our output transformers ll1620, ll1623 and ll1627, this sheet suggests two different wiring alternatives where the opt secondary is reconnected using only three jumpers.
It its about the same size as the original youre probably ok. Audio output transformer, ohm ct primary, 8 ohm ct secondary. The wattage output in an amplifier may vary from application to application due to many variables such as tube types, solid state vs. Ive been studying audio output transformers and experimenting. The secret of selecting a good output transformer audiotalk. Tube amplifier circuit board plitron manufacturing. For those who are visualy oriented we also manufacture transformers for video cctv applications. Transcendar transformers high quality audio output transformers for high fidelity tube amplifiers. Transformers, transformer rewinding audio transformers by cinemag inc. Each was run in triode mode and ultralinear mode if they had the tap. Electra print audio singleended output transformers. Tubes, transformers, parts, vintage gear audio transformers.
Make offer thordarson t54834 audio output transformer. Rw405 is r core audio output transformer for single ended type amplifier. A mcintosh audio amplifier incorporating a trifilar. Mullard 33 is a quite popular 3w electron tube amplifier introduced by mullard ltd in 1955. Tube amplifiers, dacs, speakers, parts audio part laboratory apl. Inspire a love of reading with prime book box for kids. Due to the unique interleaving of the windings both secondary windings must be engaged to meet specifications see hookup diagrams below. It was suggested that you could put an 8 ohm load on a 16 ohm 5k primary transformer to get a 2. Classictone vintage constructed amplifier transformers by magnetic components, inc.