Transformer Question

[billy]

Is it possible to just run a +4 line signal through a transformer without all the other components in a mic pre or compressor? Would it still give the "sound" associated with that transformer? Are there any common audio transformers that this could work with that actualy sound good? If anyone cares to explain the "ratio" concept I'd be grateful...like would there be any signal loss and why...

[gyraf]

A very complicated area - but the short version is: No free lunch.

Jakob E.

[ulysses]

Yes, you can put a line-level signal through a 1:1 transformer that's rated to handle line-level signals. This is often done to balance or unbalance a signal, and/or to isolate or ground-lift the load from the source. There is a slight loss of signal, typically a small fraction of a decibel. Correct frequency response will usually depend on the transformer being terminated with the load it's designed to work into.
And yes, the transformer will contribute whatever coloration it has to offer to the signal being passed through it. The thing is, good 1:1 transformers can be very clean so you might not notice a whole lot of coloration. Bad transformers will likely produce a more pronounced coloration, but it may not be a coloration you actually like. Transformers tend to cause some phase shift and distortion, both typically most pronounced in the low frequencies. And some will roll off the high and low frequencies. The exact sound depends on the particular transformer in question - its physical size generally determines the maximum signal level, and also the max low-frequency level before distortion takes off. The core material also comes into consideration there. The turns ratio generally affects the phase response. It's typical for higher-ratio transformers (such as mike preamp input transformers, and the step-down transformers used for outputs on tube gear) to have more of a "sound" than 1:1 output transformers.

So there's the long answer. The short answer is, if you can find a 1:1 transformer laying around that you think could work, you should wire it up and give it a try. There's no power circuitry involved in this experiment, so you aren't likely to hurt anything by giving it a shot.