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True Coil is our transformer technology designed by Carlo Soriaso for audio interfaces to bring all the flavor from the gold era of the recording gear to guitar and bass pedals, and even tube amps to provide a more real and rich sound that is very easy and convenient to use.

After many years experimenting to perfect our transformers, looking for the best response for our user, Carlo mastered the alchemy behind the magnificent vintage sound and found the right combination of materials, size and winding needed to achieve the right balance so our players can perceive better dynamics, more details and harmonic complexity from the first time they play one of our Series 81- one of the few pedals in the market that mount output transformers inside pedal effects.

The true coil technology is the sum of two part, the Driver and the Output Transformer. The driver is used for give some gain and strength to the signal plus it has the arduous task of drive correctly the Output Transformer with the right linearity on high frequencies and the ability to drive an inductive load very well.
To guarantee these results Carlo used class A topology circuit with power transistor on the output side.

True-Coil diagram
True Coil
Frequencies response [10Hz-40kHz] of the Discrete Class AB driver circuit (thin) and the combo Driver&Output Transformer (bold). As you can see the Output Transformer is designed to give some color to the overall sound with some high end and reducing the overall band. This is traduced in more complex harmonic contents when the circuit manage overdriven signal.

The second element of True Coil is the Output Transformer itself, this is a very critical part that took us lot of time for experiment and design before achieve the right balance. The transformer should be small enough to fit inside a pedal, able to manage line level signal and with a very good frequencies response. We can wind it for match very well the audio flat response from 20Hz to 20kHz, or, as we did in the Series81 chose to wind them for give the right “color” to the audio signal.

LAA-CUSTOM di C. Sorasio
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Via Nicola Porpora 7
10155 Torino - Italy

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