Source: Press Release, Last Accessed: 2023/03/31

Copland recently introduced a new tube-based integrated amplifier. Named CTA407, the new amp features a push-pull, Ultra Linear output stage with a self-biasing circuit, allowing for 50W per channel.
There is a distinctive mood of luxurious puritanism to be found in the appearance of most Copland amplifiers. However, with the CTA407 tube amplifier the company have compromised simplicity, introducing a fair deal of electronics supporting the audio stages of the amplifier. The forty LED diodes on the front panel (10 for each tube) are the visual part of the CTA407 tube bias and diagnostic system. And yes, the LEDs can be turned off if you don’t want to read the status of your power tubes on the fly.
The CTA407 will automatically adjust for any tube in the 6550/KT88/KT120/KT150 family. The CTA407 servo system is not only a lossless automatization of the bias adjustment – it is an integrated part of the CTA407 internal high pass filtering, closely matched to the transfer function of the amplifying circuitry and a vast improvement to the overall fidelity of the amplifier, Copland says.
The CTA407 employs five line-level inputs including a tape monitor loop and a built-in RIAA phono circuit accommodating moving magnet, as well as high output moving coil cartridges.
The push pull output stages consist of a pair of matched power tubes in fixed ultra linear configuration, providing the low distortion of triodes and the power of tetrode valves. A pair of 6550 or KT-family tubes in push-pull configuration can deliver more than 100W of audio power. Moderating the power output, the CTA407 delivers 2x50W in high biased class AB mode. In practice, this means that the amplifier can deliver most its power in class A state.
According to the published details, due to the quality of the output transformers, superb linearity is achieved before feedback is employed, reducing the requirements for internal lag compensation networks, and ensuring high stability after the 18dB negative feedback loop is closed.
The CTA407 employs motor driven volume control and can be fully controlled by the Copland RC102A remote control unit.

For more information: https://copland.dk/

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