Quicksilver m 60 monoblocks real interstage transformers. There are many ways in connecting a driver to a powertube, all with the same goal. 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. Output transformers chokes interstage lineoutput transformer power transformers. I also read about the highly regarded amity and karna amplifiers that d olsen built and they have also interstage transformers.
When conventional design practice is applied to this type of transformers you easily get destructive capacitive coupling between the primary and secondary windings. Introduction of 300b205d pushpull monaural power amplifier this amplifie is maketoorder product. Audio transformer and impedance matching transformer. They started to look like a crude audio interstage transformer. Choke coil capacitor input rectifier cinput allowable current. Center tapped secondary may be used for pushpull grids. 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. Hammond puts a century of experience into manufacturing high quality magnetics for tube applications like hifi audio and guitar amplifiers. Frequency phase response of valve inter stage coupling transformer.
Fender musicmaster bass style interstage driver, 026847. Designed for general purpose or replacement use in single ended or phase inverter tube driver circuits. Transformers lightning strike audio cassette by ladybird books childhood throwback, the transformers childrens books by ladybird came. 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. This allowed some mixing and matching of the parts. As well as stepping up increase or stepping down decrease a signal voltage, transformers also have one very other useful property, isolation. I understand the impedance ratio is the square of the turns ratio. Hedgehog transformers are occasionally encountered in homemade 1920s radios. In a silly moment i put two chokes together open end to open end. Resistance checks showed the primary winding is open. This is for 1 piece of a utc 031 ouncer audio transistor interstage transformer primary split.
Lundahl transformers sweeden filament choke ll 2733 1. This auction is for a nos new in box pair of stancor a53c audio interstage transformers. Transformers audio note, tango, hashimoto, tamura, partridge. This hammond dropped right in electrically and mechanically. Investigating phase angle phase shift issues using interstage transformer coupling of voltage amplifiers vs capacitor coupling rc of voltage amplifier stages in audio amplifiers. 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. Utc audio interstage transformers a32 transformervintagego.
Audio interstage transformers from scrap canadian vintage. Fatboy 300b pushpull amp pete milletts diy audio pages. It is no more used a lot, quality transformers are rare and so are their manufacturers. High quality rcore output transformer and interstage transformer. Also, if you need some more useful information but written in japanese about tamura transformers like how to connect terminals, characteristic figures, etc.
Frequency phase response of interstage transformer youtube. Transformers used between the record medium and loudspeakers. For sale is a set of amorphous core transformers from tribute in netherlands. Those that follow my work would be familiar with my affinity towards buidling single ended amplifers, e. Interstage audio transformer too old to reply nelson. The junior novel by hasbro available from rakuten kobo. Hashimoto brand tube transformer specifications click here to download the pdf specification file. Audio transformers are designed for use in audio amplifier applications for coupling and impedance matching of amplifiers and speakers. 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. 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. Our part number 124b is the same as our 124a except for 49% nickel laminations for greater fidelity. Like vacuum tubes, transformers are vital to the sound and performance of your amplifier. These transformers fill a broad application spectrum in the audio industry. Interstage, headphone and line output transformers lundahl.
May 25, 2010 in a silly moment i put two chokes together open end to open end. Transformer audio interstage, 10 ma ce distribution. High performance audio transformers for audiophile applications from lundahl transformers. Connection diagram for lundahl 1660 interstage transformer below is the original iron concertina article. If interstage transformers are done right, they can sound better than resistorcapacitor coupling. Balanced interstage transformer monolith magnetics. Since the birth of audio electronics, the audio transformer has played an important. Silver wire windings available at current market prices. The coils all a tap on the windings and the windings of the transformers also varied in resistance.
Enameled copper wire is wound round the central half of the length of a bundle of insulated iron wire e. During the last year lundahl transformers have developed a new line of singleend to singleend 1. I tried a number of different tubes including the ones recommended on the tango datasheet to drive the nc14, and this was the best i had. Triad produces a wide assortment of audio transformers for use in printed circuit designs. Designed for general purpose or replacement use in pushpull or phase inverter tube driver circuits. It is no more used a lot, quality transformers are rare and so. 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. Investigating phase angle phase shift issues using interstage transformer coupling of voltage amplifiers vs capacitor coupling rc of voltage amplifier stages in audio. Ank audio kits the authority in high end audio kits. This transformer was carefully removed, preserving its lead lengths. A pushpull audio amplifier design using the iron concertina phase splitter click for a larger audio circuit design image. Used it to replace a driver transformer for pp 45s in a gm253 lowboy ca. Hashimoto sansui vacuum tube transformer vacuum tube. Assuming an interstage transformer winding ratio of 1.
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. They are homemade audio interstage coupling transformers. Welcome to usaudiomart, a classifieds site for used audio and hifi. Original transformer primary went open after about a month when restored set started being used 23. The hammond series appears to be a larger transformer. We have been producing tube output transformers continuously for over 75 years, constantly improving and tweaking their performance. The excellent magnetic properties of r core and precisely wound coil by the computerized manufacturing.
These would work beautifully with 417a or c3g in a 2stage 45 set, for instance. 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. Hammond 124 series tube driver interstage transformers, designed for general purpose or replacement use in pushpull or phase inverter tube driver circuits. Transformers in this category are hermetically sealed and of lower impedance than 1k ohms. A transformer schematic is depicted in figure 1 below. The original transformers are usually found with open windings due to the fine wire and high turns usedcoupled with age. 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. They have a 100v rating but many sets only run 90 volts anyway. Purchased for low power system which never materialized. Audio note kits parallel single ended 300b interstage. Jan 22, 2010 home the canadian vintage radio society, and its bimonthly publication, canadian vintage radios, is dedicated to the preservation, restoration, collection and enjoyment of antique radios and related items.
Aee has been developing audio transformers for many years and this area no longer holds any secrets for us. 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. Triad audio printed circuit transformers are used in line matching, telephone coupling, pulse trigger, interstage, output, isolation and input applications. 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. Rauland borg input transformer matched pair r1050 la0082b r029 mic or sut. Softone rc20 versatile audio interstage transformer. Lundahl transformers tube amplifier transformers are built in our dual coil. Buy transformer hammond, audio interstage, 15k pri, 33. I replicated the circuit faithfully with an exception of the interstage transformers. If youre antsy about that voltage you can always put this one on the detector and move a good detector one.
This will reduce the hf bandwidth and increase hf ringing. Vintage constructed amplifier transformers by magnetic components, inc. New interstage transformers designed for singleended. Tube amplifiers and interstage transformers audiogon. Transformers in this category are hermetically sealed and of higher impedance than 1k ohms. Then sansui perfected tube amplifier technologies by the end of the 1960s with. If you are looking for good audio transformers, you will find them at automatic electric europe. Combining driver tube, recommended in the range of value of the plate internal resistance rp is are described in the field of zp. Audio transformers were originally used in valve or tube amplifiers as interstage and output transformers.
Hammond manufactures direct replacement transformers for popular tube amps from fender, marshall, vox, ampeg, orange, and yorkville traynor. Transformers g1 autobots lightning strike audiobook youtube. The signal has to be low impedant combined with enough current. They are used with push pull triode tubes like the 2a3, 45, 71a, etc. You cant get that from an rc interstage coupling network. Interstage transformers can be made in different ratios, primary currents and voltage ratings. 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. Satellite tv equipment free delivery possible on eligible purchases. Other than that, these transformers are as i found them. Money back guarantee ensures you receive the item you ordered or get your money back. I was told by one tech the most influential transformer in a piece of gear is the input transformer. Interstage transformer coupling vs capacitor rc coupling. 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.
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. Antique radio forums view topic audio interstage transformers. I tested all of the connections with a multimeter and found nothing open. Tribute amorphous core transformer set filament and interstage. Transformer audio interstage, 10 ma equivalent to stancor a53c.
Resistive load on interstage audio transformers in tube type. Click for a larger power supply circuit design image. The product is enclosed in the square case on the left. Transformer audio interstage, 10 ma antique electronic supply. Audiophile applications lundahl transformers audio. Transformers for tube amplifiers by igor s popovich, 9780980622386, available at book depository with free delivery. Although the stepup turns ratio of a transformer may provide noise free. Hashimoto hasmimoto pricelist product information incl. Much which follows on the topic of audio transformers is of necessity somewhat over simplified to give a general overview. I have intermittent cracking noise i pointed out to the audio interstage transformer t8. Sale is for the 10 pcs lot hard to find tube driver and line transformers one hammond 124e driver pri. Transformer hammond, audio interstage, 5 watt, primary impedance.
Audio interstage transformer specs antique radio forums. Tested and working this is an audio interstage transformer removed from an atwater kent model 35. Somehow, it looks like some of the most expensive set amplifiers have interstage transformers like audio note or shindo. 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. 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. 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. Our audio transformers are manufactured to customer specification. Transformer audio interstage, 10 ma antique electronic. Our most exciting recent products are the expanding range of interstage coupling transformers. More than 80% of our transformers manufactured is for this market and bring over 70 years transformer manufacturing expertise to our product.
Interstage coupling was widely used in the early days of radio and audio, in fact it is still used in r. The right on the photo is the r core audio interstage transformer in bare condition. Many famous brands use tango, tamura, hashimoto or lundahl transformers on their amplifiers and not without good reason. I have numerous times in the past used the pt156 from aes. New tube gear mostly only have an input and output transformer. Harveydr gizmo rosenberg was orgasmic over the sun audio kits.
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