Hashimoto sansui vacuum tube transformer vacuum tube. Connection diagram for lundahl 1660 interstage transformer below is the original iron concertina article. Interstage, headphone and line output transformers lundahl. Rauland borg input transformer matched pair r1050 la0082b r029 mic or sut. They are homemade audio interstage coupling transformers. A transformer schematic is depicted in figure 1 below. Equal cathode resistors establish the bias voltage for the power tubes grids and the 10k load resistors give the interstage signal transformers something to bite on. Transformer audio interstage, 10 ma equivalent to stancor a53c. Money back guarantee ensures you receive the item you ordered or get your money back. When conventional design practice is applied to this type of transformers you easily get destructive capacitive coupling between the primary and secondary windings. Sale is for the 10 pcs lot hard to find tube driver and line transformers one hammond 124e driver pri. Softone rc20 versatile audio interstage transformer. This auction is for a nos new in box pair of stancor a53c audio interstage transformers.
They are used with push pull triode tubes like the 2a3, 45, 71a, etc. They started to look like a crude audio interstage transformer. Resistive load on interstage audio transformers in tube type amplifiers interstage transformers are the same size, copper frames come as standard, 78mm wide by 67mm high by 67mm deep, with mounting holes centre to centre at 54mm by 54 mm both with transformer standing up or lying down. 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. Today ank delivers world class ccore and ei, dac, preamp and phono technology along with 300b el34 and el84 amplification mono blocks, stereo versions, interstage coupled. The hammond series appears to be a larger transformer. Enameled copper wire is wound round the central half of the length of a bundle of insulated iron wire e. Perfect drop in replacement for audio interstage transformer for gibson white panel amps that use a transformer for phase inverter. I have intermittent cracking noise i pointed out to the audio interstage transformer t8. Quicksilver m 60 monoblocks real interstage transformers.
Transformer audio interstage, 10 ma antique electronic supply. 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. I understand the impedance ratio is the square of the turns ratio. Transformers in this category are hermetically sealed and of higher impedance than 1k ohms. Where z p is the primary winding impedance, z s is the secondary winding impedance, n p n s is the transformers turns ratio, and v p v s is the transformers voltage ratio so for instance, an impedance matching audio transformer that has a turns ratio or voltage ratio of say 2. Transformers for tube amplifiers by igor s popovich, 9780980622386, available at book depository with free delivery. It is no more used a lot, quality transformers are rare and so. The output voltage of a tube stage is much higher than the bias needed for the next stage, we should eliminate the dc and let only the ac arrive to the next stage. Assuming an interstage transformer winding ratio of 1. Combining driver tube, recommended in the range of value of the plate internal resistance rp is are described in the field of zp. Resistance checks showed the primary winding is open.
Many famous brands use tango, tamura, hashimoto or lundahl transformers on their amplifiers and not without good reason. This hammond dropped right in electrically and mechanically. Tested and working this is an audio interstage transformer removed from an atwater kent model 35. Transformer audio interstage, 10 ma antique electronic.
When restoring antique radios you occasionally discover defective output transormer. Output transformers chokes interstage lineoutput transformer power transformers. All copper copper transformers have copper lead out wires, copper silver have copper on the primary and audio note silver leadout wires on the secondary and silver naturally silver all round. 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. Audio transformers were originally used in valve or tube amplifiers as interstage and output transformers. Resistive load on interstage audio transformers in tube type.
While the ll1660, ll1692a, and ll1671 have been great transformers in my hands and in those of many others, there was performance to be gained by designing new transformers whose winding geometry has. 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. Interstage coupling was widely used in the early days of radio and audio, in fact it is still used in r. Designed for general purpose or replacement use in pushpull or phase inverter tube driver circuits. Transformers g1 autobots lightning strike audiobook youtube. Interstage audio transformer too old to reply nelson. These would work beautifully with 417a or c3g in a 2stage 45 set, for instance. Interstage, headphone and line output transformers. Purchased for low power system which never materialized.
Transformers iso lundahl tango hashimoto tamura partridge. High quality rcore output transformer and interstage transformer. Utc audio interstage transformers a32 transformervintagego. If interstage transformers are done right, they can sound better than resistorcapacitor coupling. Other than that, these transformers are as i found them. Also, if you need some more useful information but written in japanese about tamura transformers like how to connect terminals, characteristic figures, etc. May 25, 2010 in a silly moment i put two chokes together open end to open end. New tube gear mostly only have an input and output transformer. Designed as an output tube for battery radios that put out a couple hundred mw of audio, its low rp makes a really good interstage transformer driver. Silver wire windings available at current market prices. The signal has to be low impedant combined with enough current. The original transformers are usually found with open windings due to the fine wire and high turns usedcoupled with age. I am having an extremely difficult time gaining an understanding of interstage audio transformer specifications, and how to use them to find a transformer that can be used in a circuit. Used it to replace a driver transformer for pp 45s in a gm253 lowboy ca.
Our audio transformers are manufactured to customer specification. Tribute amorphous core transformer set filament and interstage. Hashimoto brand tube transformer specifications click here to download the pdf specification file. You cant get that from an rc interstage coupling network. I replicated the circuit faithfully with an exception of the interstage transformers. Interstage transformers can be made in different ratios, primary currents and voltage ratings. The excellent magnetic properties of r core and precisely wound coil by the computerized manufacturing system achieve a wide bandwidth, low distortion, and low magnetic loss of the transformer. More than 80% of our transformers manufactured is for this market and bring over 70 years transformer manufacturing expertise to our product. If youre antsy about that voltage you can always put this one on the detector and move a good detector one. Hammond puts a century of experience into manufacturing high quality magnetics for tube applications like hifi audio and guitar amplifiers. I tested all of the connections with a multimeter and found nothing open. We have been producing tube output transformers continuously for over 75 years, constantly improving and tweaking their performance. Transformers used between the record medium and loudspeakers.
Audio transformers signal level, speaker level, tube audio. Those that follow my work would be familiar with my affinity towards buidling single ended amplifers, e. Since the birth of audio electronics, the audio transformer has played an important. I have numerous times in the past used the pt156 from aes. Click for a larger power supply circuit design image. Investigating phase angle phase shift issues using interstage transformer coupling of voltage amplifiers vs capacitor coupling rc of voltage amplifier stages in audio amplifiers. Frequency phase response of interstage transformer youtube. Triad audio printed circuit transformers are used in line matching, telephone coupling, pulse trigger, interstage, output, isolation and input applications. Ankits ank is the world leader in high end audio kits based on the audionote design philosophy born out of audionote uk in 2004 as the audionotekit business. Hedgehog transformers are occasionally encountered in homemade 1920s radios. New interstage transformers designed for singleended.
Vintage constructed amplifier transformers by magnetic components, inc. Original transformer primary went open after about a month when restored set started being used 23. The excellent magnetic properties of r core and precisely wound coil by the computerized manufacturing. Audiophile applications lundahl transformers audio. Our most exciting recent products are the expanding range of interstage coupling transformers. This allowed some mixing and matching of the parts. The junior novel by hasbro available from rakuten kobo. High performance audio transformers for audiophile applications from lundahl transformers. This transformer was carefully removed, preserving its lead lengths. Investigating phase angle phase shift issues using interstage transformer coupling of voltage amplifiers vs capacitor coupling rc of voltage amplifier stages in audio. I was told by one tech the most influential transformer in a piece of gear is the input transformer. Satellite tv equipment free delivery possible on eligible purchases. Transformer audio interstage, 10 ma ce distribution.
The coils all a tap on the windings and the windings of the transformers also varied in resistance. Transformers in this category are hermetically sealed and of lower impedance than 1k ohms. Lundahl transformers tube amplifier transformers are built in our dual coil. I notice lots of old tube gear like pultec eqs, universal audio 175s have interstage transformers. New universal interstage transformer, 20,000 ohm ct primary with 80,000 ohm quad split secondary. This is a universal replacement type it will replace any of the three audio transformers used 1st audio driver2nd audiophase splitter stage or output transformerby correctly connectiong the 5 lugs.
They have a 100v rating but many sets only run 90 volts anyway. Triad produces a wide assortment of audio transformers for use in printed circuit designs. At this point, if you find the word audio transformers on its left side, please click on the word or on a small picture on the other side to see the catalog 392k in pdf file. Hammond manufactures direct replacement transformers for popular tube amps from fender, marshall, vox, ampeg, orange, and yorkville traynor. Had a 1942 zenith 8s661 with one side of the primary winding of the output transformer open. Choke coil capacitor input rectifier cinput allowable current. Lundahl transformers sweeden filament choke ll 2733 1. Audio transformer and impedance matching transformer. This is a transformer, having primary and secondary windings, which can easily deliver the current to the powertube. Theres a couple of tricks available for battery set interstage xfmrs if you dont mind living on the edge. A pushpull audio amplifier design using the iron concertina phase splitter click for a larger audio circuit design image. Balanced interstage transformer monolith magnetics. During the last year lundahl transformers have developed a new line of singleend to singleend 1. Interstage transformer coupling vs capacitor rc coupling.
Frequency phase response of valve inter stage coupling transformer. Previously only available as very expensive imports from the far east, interstage transformers are believed to be the only true method of driving output valves by many fevered oriental audiophiles. The product is enclosed in the square case on the left. Audio interstage transformer specs antique radio forums. Much which follows on the topic of audio transformers is of necessity somewhat over simplified to give a general overview. I also read about the highly regarded amity and karna amplifiers that d olsen built and they have also interstage transformers. Center tapped secondary may be used for pushpull grids. Transformers lightning strike audio cassette by ladybird books childhood throwback, the transformers childrens books by ladybird came. If you are looking for good audio transformers, you will find them at automatic electric europe. Buy transformer hammond, audio interstage, 15k pri, 33.
There are many ways in connecting a driver to a powertube, all with the same goal. These transformers fill a broad application spectrum in the audio industry. I once had, now long lost, some paperwork written by western electric engineers, and they spoke of using transformers to minimise energy loss and indeed interstage coupling, if applied correctly, results in the most efficient coupling of one stage to the next, and. Welcome to usaudiomart, a classifieds site for used audio and hifi.
Introduction of 300b205d pushpull monaural power amplifier this amplifie is maketoorder product. Tube amplifiers and interstage transformers audiogon. Audio note kits parallel single ended 300b interstage. Then sansui perfected tube amplifier technologies by the end of the 1960s with. Like vacuum tubes, transformers are vital to the sound and performance of your amplifier. This will reduce the hf bandwidth and increase hf ringing. Fender musicmaster bass style interstage driver, 026847. This is for 1 piece of a utc 031 ouncer audio transistor interstage transformer primary split. Although the stepup turns ratio of a transformer may provide noise free. Hashimoto hasmimoto pricelist product information incl. Our part number 124b is the same as our 124a except for 49% nickel laminations for greater fidelity. As well as stepping up increase or stepping down decrease a signal voltage, transformers also have one very other useful property, isolation. Ank audio kits the authority in high end audio kits. Transformer hammond, audio interstage, 5 watt, primary impedance.
Designed for general purpose or replacement use in single ended or phase inverter tube driver circuits. Somehow, it looks like some of the most expensive set amplifiers have interstage transformers like audio note or shindo. Hammond 124 series tube driver interstage transformers, designed for general purpose or replacement use in pushpull or phase inverter tube driver circuits. The same transformer is used in many early atwater kent radios ranging from the model 20 coffin style battery set through the 40 series breadbox style ac sets. Magnetic coupling in interstage transformer is the best energy transfer mechanism for low frequency audio frequency that can be best viewed same as the force working in most dynamic loudspeaker drivers. Aee has been developing audio transformers for many years and this area no longer holds any secrets for us. Audio transformers are designed for use in audio amplifier applications for coupling and impedance matching of amplifiers and speakers. It is no more used a lot, quality transformers are rare and so are their manufacturers. The right on the photo is the r core audio interstage transformer in bare condition.
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