Copland CTA407 Integrated Tube Amplifier Black

Copland has always maintained that the amplifier is the interface between the signal sources and the loudspeaker system; any information that is lost or misinterpreted at this point is lost forever, and conversely, any additional information that is introduced is amplified. Amplifiers are considered everyday appliances, and while some are of standard quality and construction, others successfully depart from the conventional, reminding us of the pursuit of perfection, a human virtue that we like to acknowledge and strive for.

The aesthetics of most Copland amplifiers are characterized by an unfussy luxury. However, with the CTA407 tube amplifier, simplicity of design has been compromised by the addition of a fair amount of electronics to support the amplifier's audio stages.

Forty LEDs on the front panel (10 for each tube), display the bias system and diagnostics of the tubes used in the CTA407. For those who do not want to see them always on, it is possible to turn them off.

One of the advantages of the CTA407 amplifier is the automatic bias adjustment for whichever tube, from the 6550/KT88/KT120/KT150 family, is used in the power stage. The CTA407's self-biasing system is not only lossless, but is an integrated part of the internal high-pass filtering, which perfectly matches the amplifier's transfer function and significantly improves its overall quality.

The Copland CTA407 has five line inputs, including a tape monitor loop, and an MM phono input, capable of accommodating both moving magnet and high-output moving coil cartridges. This is an evolution of the Copland CTA405 amplifier, coveted by audiophiles worldwide since its launch over a decade ago.

The push-pull output stages consist of a pair of power tubes per channel, in an ultra-linear fixed configuration, featuring the low distortion of triodes and the generous power of tetrodes. Typically a pair of 6550 or KT family tubes in push-pull configuration can deliver over 100W. Moderating the output power, the CTA407 delivers 2x50W in high bias mode in class A/AB. In practice, this means that the amplifier delivers most of its power in Class A.

Thanks to the excellent quality of the output transformers used, almost perfect linearity is achieved before using feedback, reducing the internal delay compensation networks and ensuring high stability after the 18dB negative feedback closing loop.

The CTA407 reproduces music remarkably accurately, without ever hinting at listening fatigue, with strong dynamics and wide flexibility in the choice of speakers. The low noise from the amplifier itself is a joy, especially for owners of high efficiency speaker systems.

The CTA407 employs a motorized volume control and can be controlled in its main functions by the Copland RC102A remote control.

FEATURES

Tubes used: 6550/KT88: 4pcs

12BH7: 2pcs

ECC83: 1pcs

The auto bias system also automatically adjusts for the use of:

KT90 / KT100 / KT120 / KT150

Power: 50W / channel at 4 / 8 ohms

THD: Less than 0.5 % at all levels

Frequency response: 10 Hz 150 kHz - 3 dB

Line input sensitivity: 200 mV

Phono input sensitivity: 2.5 mV

Line input impedance: 50 K ohms

Phono input impedance: 47 K ohms

Signal to noise ratio (IHF-A): 100 dB

Power supply: 230V / 240V +/- 12 %

Consumption: 300 W

Dimensions (WxHxD): 435x215x420mm

Weight: 20kg