I volunteered to put a 4 ohm load on my amplifier and re run the tests. Information about tube audio, transformers ohs audio. The large transformers are tested at 44 hz, this frequency was chosen because it is the lowest note on a bass guitar. Designed for general purpose or replacement use not hifi, in single ended, tube output circuits. Output amplifier consists of a 6p1p output tube and output transformer fig. 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. Understanding your output transformer part one by mark baier. Tube amplifiers, tube amplifiers kits, forum, parts olimpiaaudio. Circuit of tube amplifier device the output transformer is an important part of the amplifier requiring a thorough parameter determination. For example, we supply pipes, resistors, pot meters, enclosures and cabinets. High performance audio transformers for audiophile applications from lundahl transformers. Output transformers 34 passive preamplifier 7 poatable hifi headphone amplifier 2 power cords sockets fuses 7 power transformers for tube amplifier 34 pullpush tube amplifier 4 r type transformer 5 radio tuner 11 singleended tube amplifier 24 stepping stereo volume potentiometer 2 toroidal transformer 15 transformer. If you must use the transfomers in parallel, then yes, primaries parallel secondaries in series gives 4k. But i have noticed the massive upcharge when transformers are encapsulated or cores are nickel.
Impedance for nfb winding is 16 sg taps are provided for the models excepting f781, 782, 783, so that ul circuits can be constructed. Used to build model 6g15 stand alone reverbs, revibes and preamps. The preamp circuits in the mics require transformers to properly feed the preamp stage, which may also be of the tube variety, closing the loop as it were. But to fully close it, all tube mixing consoles also exist, though the breed is rather rarefied. 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. All transformers are tested at 100 hz, 1 khz, and 10 khz. Heres how audio transformers work for impedance matching, as discussed in my book teach yourself electricity and electronics. Enclosed shielded, 4 slot, above chassis type x mounting. He wrote over 360 articles for various dutch high end audio magazines and is the author of the book transformers and tubes.
Output transformers made in usa triode usa tube amp kits. Transformers iso lundahl tango hashimoto tamura partridge. It has 100, 120, 220 and 240 volt export primaries. Tamura corporation audio transformers for tube amp. My ios calculator app for power and output transformers. Because of the basic physics of output transformers, he was able to solve the problem. Specifications output 8 w primary impedance 4,000 to 9,000. Transformers, diy tube amplifiers majestic transformer co.
Nov 18, 20 in an output transformer, the low frequency response is largely governed by the size or mass of the stack. All our transformers are hand crafted in our facility using the finest wire and lamination materials. Hammond output transformer audio transformers signal transformers are available at mouser electronics. Universal single ended tube output 125se series hammond mfg. Look at the pictures below, and you will see that it is not a fair test.
World tube audio portal category output transformers pp. So where is the good real tube output transformers at reasonable prices. Vintage western electric we coil output transformer d88439 audio mk200. Audiophile applications lundahl transformers audio.
Understanding your output transformer part one by mark. The free shipping option allows tubedepot to choose the most appropriate carrier and service. Tube amp transformers tube amp parts, guitar amp parts. 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. Testing an unknown output transformer on a speaker i recently acquired. Moreover, the last two decades have seen many new tube microphones enter the market. It was set up for experimentation, and output transformers could be swapped in minutes, using only. The rectifier tube is sending out 327 volts dc from pin 3. It was suggested that you could put an 8 ohm load on a 16 ohm 5k primary transformer to get a 2. The transformer specs indicate 10,000 ohms plate to plate, center tapped, primary and multitapped secondary. Hammond manufactures direct replacement transformers for popular tube amps from fender, marshall, vox, ampeg, orange, and yorkville traynor.
Audio transformers tube output transformers lundahl. We have been producing tube output transformers continuously for over 75 years. Audio transformer is the primary part of a tube amplifier which. It is impossible to make a truly exceptional amplifier without investing in the best possible output transformer, which in turn must be correctly designed for the circuit and valves being used. More information about these audio transformers, power supplies and sets can be found under products, high quality audio transformers. Acxico 1pcs 5k 5w singleended output audio transformers 6p1 6p14 6p6 tube amp output transformers. Discover over 1151 of our best selection of audio output transformer on with topselling audio output transformer brands. Feb 26, 2015 tube output transformers i have acquired from the flea market and students who pay me in parts. Apr 30, 2010 the output transformer is the heart of a valve amplifier. The a side of the main output cap measures 307 volts and the b side measures 327 volts. Output trannys contribute most of the distortion in a valve amp and have a limited bandwidth. Unfollow audio output transformers to stop getting updates on your ebay feed.
Electra print audios new transformer is designed to offer a3 operation providing. The output transformer is, without doubt, the single most important component in any high quality valve amplifier. About 51% of these are transformers, 6% are other electronic components. Classic tube output audio transformer overview hammond mfg. How to get the maximum from the available jensen speakers without risking catastrophic failure. Electraprint makes custom output transformers for use in home high fidelity tube audio components.
Best value audio output transformer great deals on audio. 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. Some of the problem is that there is some competition on the market from the audiophile world. Each was tested with cathode feedback, and without cfb. 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. Ive been studying audio output transformers and experimenting. Output transformers with silver wound on the secondary side in combination with amorphous core. The following guidelines should be taken into account. All are handmade to our unique standard designs or custom made to meet customers specifications. Im using a chicago a3831 universal output transformer. Audiophile tube output transformers 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.
Each was run in triode mode and ultralinear mode if they had the tap. Atlas sound 3 avel lindberg 24 bogen 1 dayton audio 1 factory buyouts 2 hammond manufacturing 10 jensen transformers. All opts are built in our dual coil single c core style and can be ordered with a choice of core airgap for. Silver wire windings available at current market prices. These high quality units are designed for maximum versatility. The output transformer as an impedance matching device, works on the principal of reflected load. Hammond puts a century of experience into manufacturing high quality magnetics for tube applications like hifi audio and guitar amplifiers. Hammond manufacturing murata electronics pulse electronics network pulse electronics power sumida america components inc. 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. Conventional vacuum tube amplifier designs rely upon an output transformer to couple the amplifiers output stage to the loudspeaker. 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. When powered, the pt is putting out 280 volts on each of its main outputs to rectifier pin 1 and 7. The electraprint transformers are on the rear right of the.
A wide variety of tube output transformer options are available to you, such as power, audio, and high frequency. Results of his output transformer research were published at aes conventions in 1994 and 1998. Such a set consists of a power supply transformer, output transformer and choke coil. Electraprint 300a3 output transformer exclusive for the 300b tube. All units include an optional use 40% screen tap a proven pentode sweet spot for ultralinear operation. This is necessary to get an efficient transfer of the audio signal to the speaker. 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. Building a tube amp, how to calculate output transformer. Thats why an svt weighs so much, its ot is the size of a oldsmobile. Tube output transformers, which ones are really good. A wide variety of audio tube output transformers options are available to you, such as power, audio, and current. 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. 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. Get the best deal for vintage tube output transformer from the largest online selection at.
Transformers used between the record medium and loudspeakers. Audio output transformers electronic parts parts express. We have been producing tube output transformers continuously for over 75 years, constantly improving and tweaking their performance. Audio output transformer question antique radio forums. I set the amp up so that 3 different sets of output transformers could be tested against the electraprints. He is the designer of special toroidal output transformers for tube amplifiers in close cooperation with plitron and amplimo. Audio transformers tube output transformers lundahl transformers. Exact replacements for audio output transformers in old tube radios are often hard to find. The bigger the stack, the lower it will go without saturating. The wattage output in an amplifier may vary from application to application due to many variables such as tube types, solid state vs. 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. It is a regen radio, and the article specifies using a 10k ohm to 8. Go to this page for marshall power switch hookup diagrams. This factory matched pair of 90ma, 20w james audio js6223hs power output transformers is recommended for diy pushpull tube amplifiers built for tube types that can run at 3.
Thanks to those developments, we are now able to design, and what is most important, to produce speaker output transformers for virtually any type of vacuum tube, irrespective of topology type, be it singleended, or pushpull says maciej lachowski from fezz audio in poland. All of the transformers tested were pint sized compared to the electraprints. Designed for both triode or pentode operation class a operation. Output transformers i n our experience making a good audio transformer is a black art. In addition to audio transformers, we also manufacture standard sets. The output transformer is the heart of a valve amplifier.
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