The CTA407 is a stereo integrated amplifier with 100% tube architecture that was created with the aim of enhancing the role of the aforementioned component as an interface between the signal sources and the speakers, in order to take music reproduction to its highest levels. levels of naturalness.
Of this distinguished electronics, we must first highlight the fact that its creators have compromised the usual conceptual simplicity of Copland 's creations by introducing complex circuitry intended to support the audio stages.
As far as compatibility is concerned, the new Copland will automatically adjust to any output valve in the 6550/KT88/KT120/KT150 family thanks to a key innovation: a servo system that not only adjusts the bias automatically and without losses, but is an integral part of the device's internal high-pass filtering circuitry, closely matched to the transfer function of the amplification section.
As for the output stages, they are of the push-pull type and consist of two valves mounted in a fixed ultralinear configuration that simultaneously provides the low distortion of the triodes and the generous power of the tetrodes.
On the other hand, as a consequence of the outstanding quality of the output transformers, superb linearity is achieved even before applying feedback, thus reducing the costs inherent to the use of internal compensation circuits, as well as ensuring high stability before close the loop with 18 dB negative feedback.
Characteristics:
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