Much which follows on the topic of audio transformers is of necessity somewhat over simplified to give a general overview. This is a universal replacement type it will replace any of the three audio. Transformers lightning strike audio cassette by ladybird books childhood throwback, the transformers childrens books by ladybird came with an audio cassette remember them to listen and read. The original transformers are usually found with open windings due to the fine wire and high turns usedcoupled with age. Its important to remember that when theyre talking about audio interstage transformers, and refer to 3. The right on the photo is the r core audio interstage transformer in bare condition. These would work beautifully with 417a or c3g in a 2stage 45 set, for instance.
During the last year lundahl transformers have developed a new line of singleend to singleend 1. I took some ohmvoltage measurements with a standard ohm meter while the tranny was totally disconnected. Perfect drop in replacement for audio interstage transformer for gibson white panel amps that use a transformer for phase inverter. Center tapped secondary may be used for pushpull grids. Satellite tv equipment free delivery possible on eligible purchases.
A low current wallwart xfmrs can also do the trick. Silver wire windings available at current market prices. If interstage transformers are done right, they can sound better than resistorcapacitor coupling. For model audio interstage transformers for replacement, atwater kent mfg. Wide bandwidth output transformers for single ended and pushpull vacuum tube. Hammond puts a century of experience into manufacturing high quality magnetics for tube applications like hifi audio and guitar amplifiers. Over a period of several months while doing development work on audio amplifiers, the writer had. Merren audio provides custom wound transformers for both output and power applications including chokes. The coils all a tap on the windings and the windings of the transformers also varied in resistance.
Impedancein audio transformers even mixing consoles especially in recording work, but also in many live sound applications all depend on transformers to match the high impedances of the tubes to useful interstage and output impedances. 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. Features include audio output and lowlevel impedance matching. This may be critical on hi fi audio transformers but these old 1920s sets seem to be forgiving as noticed by the many different transformers that have been used sucessfully as. Output transformers can be designed and built with linear taps.
I replicated the circuit faithfully with an exception of the interstage transformers. This audio output transformer is perfect for various audiovideo projects. There are many ways in connecting a driver to a powertube, all with the same goal. Audio transformer and impedance matching transformer. Full geometric balance for near perfect phase splitting.
I believe the tranny is a audio interstage transformer but not sure that is the proper name. Just had to play with the capacitor value to get the bass response back to original. Wide bandwidth output transformers for single ended and pushpull vacuum tube applications. 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. 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. Interstage transformer coupling vs capacitor rc coupling. The signal has to be low impedant combined with enough current.
The quad split secondary arrangement each secondary section is 12 the turns of the whole primary. 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. Moving coil, interstage and preamp output transformers. Transformer audio interstage, 10 ma antique electronic supply. Harveydr gizmo rosenberg was orgasmic over the sun audio kits. Original transformer primary went open after about a month when restored set started being used 23. Allows you to use your original laminations and housing. If you are looking to replace radiola iiia audio transformers, check out our universal radiola replacement unit. Audio interstage transformers from scrap canadian vintage. Transformers in this category are hermetically sealed and of higher impedance than 1k ohms.
Extensive range of performance audio transformers shipped worldwide delivery updated 6th april 2020 please look below for the latest situation. Used it to replace a driver transformer for pp 45s in a gm253 lowboy ca. They have a 100v rating but many sets only run 90 volts anyway. Problem when i had this problem, robert casey suggested the capacitor fix. Audio transformers were originally used in valve or tube amplifiers as interstage and output transformers. May 25, 2010 the coils all a tap on the windings and the windings of the transformers also varied in resistance. Antique radio forums view topic helpinterstage audio. Connect the grnyel wire to the grn wire and the blkyel wire to the blk wire. Primrose audio toroid power transformers for audio builders.
Softone rc20 versatile audio interstage transformer. If youre antsy about that voltage you can always put this one on the detector and move a good detector one to. Tribute amorphous core transformer set filament and interstage. Transformers g1 autobots lightning strike audiobook. New universal interstage transformer, 20,000 ohm ct primary with 80,000 ohm quad split secondary. Impedancein audio transformers even mixing consoles especially in recording work, but also in many live sound applications all depend on transformers to match the high impedances of the tubes to. Hammond manufacturing murata electronics pulse electronics network pulse electronics power. For sale is a set of amorphous core transformers from tribute in netherlands. Plus, with our love it guarantee you never have to worry about wasting money on a bad audiobook again. I notice lots of old tube gear like pultec eqs, universal audio 175s have interstage transformers. The hammond series appears to be a larger transformer. Transformer audio interstage, 10 ma antique electronic.
Audio interstage transformers for radio part atwater kent mf. Jan 22, 2010 this may be critical on hi fi audio transformers but these old 1920s sets seem to be forgiving as noticed by the many different transformers that have been used sucessfully as replacements. 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. Transformer audio interstage, 10 ma equivalent to stancor a53c. Our part number 124b is the same as our 124a except for 49% nickel laminations for greater fidelity. A transformer schematic is depicted in figure 1 below. This allowed some mixing and matching of the parts. Interstage transformers can be made in different ratios, primary currents and voltage ratings. 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. When inquiring about toroid transformers from primrose audio, provide a full address with. 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.
Hammond manufactures direct replacement transformers for popular tube amps from fender, marshall, vox, ampeg, orange, and yorkville traynor. If you operate such a stage with an unloaded interstage transformer as load, the cathode capacitor, cathode resistor, psu capacitor and valve form a damped resonant circuit, whose resonance usually falls below 10hz and can be used to boost the lf response a little by correct tuning extending the lf response. I was told by one tech the most influential transformer in a piece of gear is the input transformer. Also, if you need some more useful information but written in japanese about tamura transformers like how to connect terminals, characteristic figures, etc. Using our free ios and android apps you simply buy, sync and listen. The product is enclosed in the square case on the left. Designed for general purpose or replacement use in single ended or phase inverter tube driver circuits. I have numerous times in the past used the pt156 from aes.
Antique radio forums view topic audio interstage transformers. New tube gear mostly only have an input and output transformer. Studio grade impedance matching audio transformers. It is no more used a lot, quality transformers are rare and so are their manufacturers.
They started to look like a crude audio interstage transformer. High performance interstage transformers for pushpull and single ended drive. With digital audiobooks from, you no longer need cumbersome cds. When conventional design practice is applied to this type of transformers you easily get destructive capacitive coupling between the primary and secondary windings. Investigating phase angle phase shift issues using interstage transformer coupling of voltage amplifiers vs capacitor coupling rc of voltage amplifier stages in audio amplifiers. Transformer audio interstage, 10 ma ce distribution. Our range of high quality audio transformers continuous to improve and expand. If youre antsy about that voltage you can always put this one on the detector and move a good detector one to the first audio. This is a universal replacement type it will replace any of the three audio transformers used 1st audio driver2nd audio phase splitter stage or output transformerby correctly connectiong the 5 lugs. Mouser is an authorized distributor for many signal and audio transformer.