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