This article originally appeared in Tape Op Magazine.
Technical editing by Scott Hampton
A transformer is a device that transfers electrical energy from one circuit to another via inductively coupled conductors – coils of insulated wire wound (most often) around a ferromagnetic core. Transformers are useful in audio recording, as they can block DC voltage and facilitate electrical isolation between gear, but they also shape the sound of signals sent through them by introducing subtle, and often very desirable “coloration”. This may be a result of any combination of frequency response, time response, distortion, or a number other factors for a particular transformer. These effects can be especially attractive when working in the digital realm, where sounds can be perceived as too “cold” or “digital”.
With all the talk of the sound of transformers, which reside in different pieces of audio gear, why not skip all the electronics and strap bare transformers into the audio path directly? The first time I heard this done was at a mastering session with Nick Blagona in Toronto, when he ran a pretty crispy sounding record through a pair of vintage Marinar transformers that he had lifted from a Neve module. The sound was just right for this record – fat lows, punchy mids and a silky top. I personally hadn’t had a chance to do much with this idea until I recently pillaged my repair guy’s stock bins, and now I’m hooked on trying all kinds of transformers in all kinds of situations.
What you’ll need are 600 ohm to 600 ohm “matching” transformers. These will generally work properly with the gear in our racks. Be careful of center tapped transformers (center tap to ground), If these are exposed to +48 volts (from phantom power) in your system they could easily be damaged. Simply wire your transformers up to cables that work with your gear or patchbay and you can insert them anywhere in your line-level signal path.
I’ve now tried transformers on all kinds of sources, and have fallen in love with many of the sounds I’m getting. My favorites so far have been a pair of vintage Triad HS-66s, as they add a mid-range thickness to the signal that really warms things up without obscuring the lows or the highs. On a full mix, they add a heft and three-dimensional quality to the sound that, while certainly not achieving the full effect, leans in the direction of a vintage console. On individual instruments they have a fattening affect that’s especially cool on kick drum and bass guitar. Pushing the signal can drive the transformer into distortion – sometimes a desirable lo-fi sound – though the need for an attenuator crops up pretty quickly. In one case I was tracking male/female duet vocals for the Brooklyn band The Loom, and found that the female singer had a strong midrange warmth that made the male voice sound a little thin in that area. By patching in one of the Triads after the compressor in his vocal chain, his sound warmed up just enough to match hers beautifully. Without disrupting the flow of the session, the transformer gave me just that little bit of harmonic complexity that I needed. It was like stirring a little more flour into the gravy, thickening to taste.
Another interesting pair of transformers were pulled from some odd quad encoder that the Japanese company Sansui was trying to develop in the ‘70s. As they were attempting to impress the pro audio market, they used some serious matching transformers. These add a harmonic richness to the midrange that can only be described as warm and fuzzy, and they also round off the highs well enough to function almost as a de-esser on certain vocals tracks. I wasn’t able to use them with any success on a mix, but on individual tracks they are able to add a strangely satisfying vibe I just couldn’t get with any other gear.
A UTC transformer that NYC engineer Matthew Agoglia liberated from a vintage compressor made a female vocal go from rich dark chocolate to three-dimensional licorice, adding a harmonic complexity that gave each syllable its own distinct vibe – way more interesting than it had been before. The same UTC on electric bass added a weight that seemed to get the signal out of the speakers and into the room, and that’s a big deal for me when working on my Pro Tools system.
With pairs of matching transformers slowly making their way to my studio, I’m beginning to see the possibility of putting them all in a (shielded) box, wiring them to DB-25 connectors and having them ready to be inserted between my converters and my Dangerous Audio summing box. Buying them in pairs allows me to send stereo stems out through matched left/right pairs, or to run full mixes through them. The cool thing about having multiple pairs is that you can have any number of different flavors on hand, rather than just multiples of the same sound as you would with a console. Then again, there is something to be said for the unifying effect of many of the same transformers. Experiment and see what works for you.
There are all kinds of transformers available, from vintage units by UTC, Triad, Marinar, CineMag and St Ives to brand new transformers from Carnhill, Jensen, CineMag, Lundhal, Sowter and others. While most of these companies are set up to supply gear manufacturers, I’ve found they’re all very approachable and willing to help a guy like me buy a pair. Most quality 600 ohm to 600 ohm transformers hover just above the $100 mark, so it’s a relatively inexpensive way to have some extra audio processing at hand. I highly recommend that anyone who is curious about this to try it out, and if you find some cool, obscure transformers with a vibe, do drop a line and let us know!
A Simple Transformer Explanation
A signal goes into one side of the transformer (usually the side driven is referred to as the primary), and the voltage that results on the output (secondary) is the input multiplied by the turns ratio (neglecting internal losses). The impedance ratio is the square of the turns ratio. Example: a 1:10 step-up transformer on a mic pre input would have a 1:100 impedance ratio. Meaning the voltage gain is x10, at a cost of increasing the output impedance by x100. A DI box is an example of going the other way, stepping the voltage down, to reduce the driving impedance. The lower the impedance a signal is being driven with, the less susceptible it is to noise. -SH


Tactilely – It’s a part of my personality to want to touch tape, watch it spinning along, cut it, tape it together, lift it, set it down. And I enjoy doing machine alignments. I used to work as a bicycle mechanic, and I miss working with my hands, holding tools and making things spin accurately and freely. I’ll be the first to tell you that working on tape is a pain in the ass, but everything that makes it a pain in the ass makes me enormously happy. I can’t claim that my tactile work itself has any impact on my mixes, but working this way has a big impact on my enjoying my work, which can easily impact my mixes. In short, I like it, and that’s good for the music.
Converters and Clocks Come First – Nothing makes less sense to me than running out of a blah digital system to tape and back in through the same blah system. At that point, was it really worth what tape gives you sonically to have passed your music through a blah system twice? For me, I spent my money on great converters and clocks before I bought my tape machine because I just don’t see the point of going to tape if the sound is going to be marred by the digital system it’s hooked up to. That’s like using hand-blended oil paints on a paper towel. Might be cool for one or two projects, but overall a waste of expensive materials that take a great deal of effort make and to use.
It was a while ago that Focal Professional ran an ad in Tape-Op with a quote from my reivew of their Solo6Be speakers. I have to say, since writing that review, I have listened to those speakers more days than not and am still impressed every time. No monitor is for everyone, but some really do offer a level of clairty that I believe to be “more accurate” than others. Their slogan “Listen to your music, not your speakers” makes sense to me. And no I do not have and endorsement deal with Focal – I just really dig these things, and am a big nerd about gear.
By the time I was done mixing this one, I felt like we were so close to having the exact sound I wanted that I thought it would be worth mastering this one myself. Everyone was happy, and to this day it’s one of my favorite sounding records I’ve worked on. The next one I mastered was Golden Dragon by the Philly band Downtown Harvest. Same thing here – we were very happy with the sound, so I went for it – again, another favorite. And on I went, slowly taking up mastering on my own while carefully observing all the great mastering engineers I’ve worked with, like
It’s hard to explain how key this piece of kit is to feeling as if I can truly make the best calls regarding producing a final product. Both the ability to hear into the music in order to make the best choices about processing and the overall increased accuracy in the digital stream that becomes the masters themselves are essential to my work at this point. It’s my humble opinion that the Antelope clocks are going to start finding their way into a majority of mastering studios.

I just installed an Antelope Isochorm Digital Clock in my mix room, and it’s an amazing contribution to my system. Anyone could hear the difference. Everything sounds so much more open, punchy, and easy on the ears. In fact, it sounds more analog. I hadn’t thought of this angle when I was writing the review of these clocks for Tape Op (with Jessica Thompson), but it’s true. Someone told me Joel Hamilton said it was like working on tape again, and it just made sense, but I’d say it also is like working on a console becuase it’s so wide and open sounding. But it is like tape in that the harshness is gone – just gone. The top end is smooth and airy, and the bottom is fat and punchy. It’s a vast improvement, and I am thrilled to have this thing ticking away in my rack.